2014 Vol. 35 Issue 5
2014 Vol. 35, No. 5
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2014, 35(5): 1-2.
doi: 10.16779/j.cnki.1003-5508.2014.05.001
Abstract:
In this paper, a description is given of new variety of the Magnolia officinalis Rehd. et Wils. subsp. biloba (Rehd. et Wils.) Law, that is M. officinalis Rehd. et Wils. subsp. biloba (Rehd. et Wils.) Law var. rubicunda Yi. It has red tepals,anthers of light red and light red gynoecium. Its growing area is Pengzhou City,Sichuan,China.
In this paper, a description is given of new variety of the Magnolia officinalis Rehd. et Wils. subsp. biloba (Rehd. et Wils.) Law, that is M. officinalis Rehd. et Wils. subsp. biloba (Rehd. et Wils.) Law var. rubicunda Yi. It has red tepals,anthers of light red and light red gynoecium. Its growing area is Pengzhou City,Sichuan,China.
2014, 35(5): 3-7.
doi: 10.16779/j.cnki.1003-5508.2014.05.002
Abstract:
In this paper based on the investigative data in a sample area of 7 000 m2,analysis was made of species composition, community structure and life form spectrum of the mid-mountain humid evergreen broad-leaved forest (MHEBF) in southern part of Mt. Gaoligong. The results showed that (1) there were 315 species of vascular plants, which belonged to 88 families and 164 genera. The main families were Lauraceae, Ericaceae,Liliaceae and Fagaceae. The main genera were Lindera,Viburnum,Polygonum and Symplocos. (2) The community could be divided into different levels, epiphyte species and hemiepiphyte species were rich,which indicated the moist habitat. (3) The microphanerophytes and mesophanerophytes were the dominant life form, which revealed the characteristic of subtropical evergreen broad-leaved forest. Microphyll, single leaf, papery leaf, non-entire margin leaf and acuminate leaf were dominant leaf characteristics. Temicryptophyte occupied the highest ratio, therophyte and geophyte were less, which showed the typical subtropical mountain forest community characteristics in Yunnan Province.
In this paper based on the investigative data in a sample area of 7 000 m2,analysis was made of species composition, community structure and life form spectrum of the mid-mountain humid evergreen broad-leaved forest (MHEBF) in southern part of Mt. Gaoligong. The results showed that (1) there were 315 species of vascular plants, which belonged to 88 families and 164 genera. The main families were Lauraceae, Ericaceae,Liliaceae and Fagaceae. The main genera were Lindera,Viburnum,Polygonum and Symplocos. (2) The community could be divided into different levels, epiphyte species and hemiepiphyte species were rich,which indicated the moist habitat. (3) The microphanerophytes and mesophanerophytes were the dominant life form, which revealed the characteristic of subtropical evergreen broad-leaved forest. Microphyll, single leaf, papery leaf, non-entire margin leaf and acuminate leaf were dominant leaf characteristics. Temicryptophyte occupied the highest ratio, therophyte and geophyte were less, which showed the typical subtropical mountain forest community characteristics in Yunnan Province.
2014, 35(5): 8-12.
doi: 10.16779/j.cnki.1003-5508.2014.05.003
Abstract:
The grassland ecosystem plays a very important role in the global carbon cycle. But the measured data is very lacking. In this paper,based on the ground survey data of the grassland in 2008 and satellite remote sensing data in Sichuan,the carbon storage in grassland ecosystem in Sichuan was estimated. The results showed that the total grassland area in Sichuan was about 22.43×104 km2 in 2008, and the total carbon storage in the grassland ecosystem in Sichuan was 2 302.97 Tg. The aboveground and underground carbon storage was 15.54 and 104.45 Tg C respectively. The underground carbon storage was about 6 times more than the aboveground; the soil organic carbon in Sichuan grassland was 2 182.98 Tg, which was about 19 times more than the vegetation carbon.
The grassland ecosystem plays a very important role in the global carbon cycle. But the measured data is very lacking. In this paper,based on the ground survey data of the grassland in 2008 and satellite remote sensing data in Sichuan,the carbon storage in grassland ecosystem in Sichuan was estimated. The results showed that the total grassland area in Sichuan was about 22.43×104 km2 in 2008, and the total carbon storage in the grassland ecosystem in Sichuan was 2 302.97 Tg. The aboveground and underground carbon storage was 15.54 and 104.45 Tg C respectively. The underground carbon storage was about 6 times more than the aboveground; the soil organic carbon in Sichuan grassland was 2 182.98 Tg, which was about 19 times more than the vegetation carbon.
2014, 35(5): 13-16.
doi: 10.16779/j.cnki.1003-5508.2014.05.004
Abstract:
The measurement was made of he growth traits of 4.5-year old young forest from 15 Liquidambar formosana geographic provenances, such as tree height, diameter at breast height(DBH), and crown breadth. The resuts of their variance and correlation analysis and genetic parameter estimation showed that there were significant differences among tree height,DBH and crown breadth among different Liquidambar formosana provenances. And the broad heritability of tree height and DBH were high,and was controlled by moderate genetic strength. There was an uncorrelated relation between tree height and DBH, but the crown breadth had a significant positive correlation with the latitude. The provenances could be divided into 4 provenance zones by using cluster analysis. As for the growth expression of young forest of Liquidambar formosana,the performance of the south provenance was worst,the performances of Sangzi town in middle provenance zone and Hucheng county in east provenance zone were best.
The measurement was made of he growth traits of 4.5-year old young forest from 15 Liquidambar formosana geographic provenances, such as tree height, diameter at breast height(DBH), and crown breadth. The resuts of their variance and correlation analysis and genetic parameter estimation showed that there were significant differences among tree height,DBH and crown breadth among different Liquidambar formosana provenances. And the broad heritability of tree height and DBH were high,and was controlled by moderate genetic strength. There was an uncorrelated relation between tree height and DBH, but the crown breadth had a significant positive correlation with the latitude. The provenances could be divided into 4 provenance zones by using cluster analysis. As for the growth expression of young forest of Liquidambar formosana,the performance of the south provenance was worst,the performances of Sangzi town in middle provenance zone and Hucheng county in east provenance zone were best.
2014, 35(5): 17-22.
doi: 10.16779/j.cnki.1003-5508.2014.05.005
Abstract:
Firstly,analytic hierarchy process (ahp) was used for 20 selected tree species to conduct model choice,and then tree species of higher scores were used in the tree planting comparison test. The results showed that (1) after being selected by AHP model, the suitable tree species for mid-sichuan hilly regions were German oak,Cork oak, Robinia pseudoacacia,Alnus cremastogyne,Camptotheca acuminata,Cedrela sinensis,Masson pine,Cinnamomum camphora and Cupressusfunebris;while the suitable shrub species were Coriaria sinica,Vitex trifolia and Pyracantha fortuneana. (2)Analyzing from survival rate,preserving rate and growth condition, Cinnamomum camphora, Alnus cremastogyne, Camptotheca acuminata, Robinia pseudoacacia and Cedrela sinensis could be replanted in Cupressus funebris forest site conditions. Cedrela sinensis should be replanted in better site conditions, while Robinia pseudoacacia should be replanted in worse site conditions. Cinnamomum camphora and Quercus variabilis should be replanted in Pinus massoniana forest. But replanting Cinnamomum camphora should be done in the stand with thicker soil layer and higher soil water content. Two years old seedlings of all nursery were suitable for replanting.
Firstly,analytic hierarchy process (ahp) was used for 20 selected tree species to conduct model choice,and then tree species of higher scores were used in the tree planting comparison test. The results showed that (1) after being selected by AHP model, the suitable tree species for mid-sichuan hilly regions were German oak,Cork oak, Robinia pseudoacacia,Alnus cremastogyne,Camptotheca acuminata,Cedrela sinensis,Masson pine,Cinnamomum camphora and Cupressusfunebris;while the suitable shrub species were Coriaria sinica,Vitex trifolia and Pyracantha fortuneana. (2)Analyzing from survival rate,preserving rate and growth condition, Cinnamomum camphora, Alnus cremastogyne, Camptotheca acuminata, Robinia pseudoacacia and Cedrela sinensis could be replanted in Cupressus funebris forest site conditions. Cedrela sinensis should be replanted in better site conditions, while Robinia pseudoacacia should be replanted in worse site conditions. Cinnamomum camphora and Quercus variabilis should be replanted in Pinus massoniana forest. But replanting Cinnamomum camphora should be done in the stand with thicker soil layer and higher soil water content. Two years old seedlings of all nursery were suitable for replanting.
2014, 35(5): 23-28.
doi: 10.16779/j.cnki.1003-5508.2014.05.006
Abstract:
The determination and anaysis were made of the contents of macro-elements (N,P,K,Ca,Mg) and micro-elements (Fe,Zn) in organic tissue of 1 to 3 years old Eucalyptus grandis saplings and their biomass. The results showed that the contents of macro-elements in organic tissue were different, their ranking was bark,leaf > twig,root > stem,micro-elements were rich in leaf and root, and the accumulated amount of macro-elements in organic tissue of single tree was leaf > twig > bark > root or stem > stem or root,and that of macro-elements in 1 to 3 years old single tree was 12.45 g,136.19 g and 420.23 g, respectively,in which their yearly net accumulation was Ca > N > K > Mg > P,and the accumulation of Fe was much higher than Zn in single tree.
The determination and anaysis were made of the contents of macro-elements (N,P,K,Ca,Mg) and micro-elements (Fe,Zn) in organic tissue of 1 to 3 years old Eucalyptus grandis saplings and their biomass. The results showed that the contents of macro-elements in organic tissue were different, their ranking was bark,leaf > twig,root > stem,micro-elements were rich in leaf and root, and the accumulated amount of macro-elements in organic tissue of single tree was leaf > twig > bark > root or stem > stem or root,and that of macro-elements in 1 to 3 years old single tree was 12.45 g,136.19 g and 420.23 g, respectively,in which their yearly net accumulation was Ca > N > K > Mg > P,and the accumulation of Fe was much higher than Zn in single tree.
2014, 35(5): 29-36.
doi: 10.16779/j.cnki.1003-5508.2014.05.007
Abstract:
Sichuan Province is located in the upper reaches of the Yangtze River. The quality of its ecological environment not only has a direct bearing on the regional ecological security, but also it occupies a pivotal position in the ecological environment and the sustainable development of social economy of the upper reaches of the Yangtze River. And yet soil erosion of this region has become the most serious ecological problem. In this paper by using the technique of GIS, analysis was made of the impact of rainfall factor,soil factor,topography factor and vegetation coverage on soil erosion sensitivity based on universal soil erosion equation. On this basis of overlapping operations of the single factor, thus an evaluation was gotten on soil erosion sensitivity of the study area by applying the spatial overlapping analysis functions of ArcGIS;Discussion was made on the soil erosion sensitivity space dividing rule of different terrain features effected by different leading factors. The results showed that the soil erosion sensitivity of the study area was mainly based on the high,middle and extreme sensitivity,the mild sensitivity and insensitivity constituted a relatively minor proportion, the spatial distribution regularity of soil erosion sensibility was obvious; The area was separated by the Longmen Mountains in the center of Sichuan province and the middle reaches of the Yalong River in southwest of Sichuan province, the sensitivity of most parts of the western area was moderate and low, the most parts of the eastern area were high and extreme sensitive areas. It indicated that the degree of soil erosion sensitivity coincided with the existing overall distribution; Rainfall, soil texture, topographic, vegetation coverage and other natural factors were potential conditions of occurrence and development of soil erosion, vegetation converage in the study area was affected by human activity more significantly than other factors. Therefore, when it was extremely difficult to change its natrual factors, protection of the exsiting primeval forest vegetation in study area and adequate restoration of ecosystem had important implications for soil erosion control.
Sichuan Province is located in the upper reaches of the Yangtze River. The quality of its ecological environment not only has a direct bearing on the regional ecological security, but also it occupies a pivotal position in the ecological environment and the sustainable development of social economy of the upper reaches of the Yangtze River. And yet soil erosion of this region has become the most serious ecological problem. In this paper by using the technique of GIS, analysis was made of the impact of rainfall factor,soil factor,topography factor and vegetation coverage on soil erosion sensitivity based on universal soil erosion equation. On this basis of overlapping operations of the single factor, thus an evaluation was gotten on soil erosion sensitivity of the study area by applying the spatial overlapping analysis functions of ArcGIS;Discussion was made on the soil erosion sensitivity space dividing rule of different terrain features effected by different leading factors. The results showed that the soil erosion sensitivity of the study area was mainly based on the high,middle and extreme sensitivity,the mild sensitivity and insensitivity constituted a relatively minor proportion, the spatial distribution regularity of soil erosion sensibility was obvious; The area was separated by the Longmen Mountains in the center of Sichuan province and the middle reaches of the Yalong River in southwest of Sichuan province, the sensitivity of most parts of the western area was moderate and low, the most parts of the eastern area were high and extreme sensitive areas. It indicated that the degree of soil erosion sensitivity coincided with the existing overall distribution; Rainfall, soil texture, topographic, vegetation coverage and other natural factors were potential conditions of occurrence and development of soil erosion, vegetation converage in the study area was affected by human activity more significantly than other factors. Therefore, when it was extremely difficult to change its natrual factors, protection of the exsiting primeval forest vegetation in study area and adequate restoration of ecosystem had important implications for soil erosion control.
2014, 35(5): 37-39.
doi: 10.16779/j.cnki.1003-5508.2014.05.008
Abstract:
2014, 35(5): 40-44.
doi: 10.16779/j.cnki.1003-5508.2014.05.009
Abstract:
Pot experiments were conducted with 5 watering treatments (watering to 80% field capacity, then stopping watering,followed by drought stress of 16 days,12 days,8 days,4 days and 0 day) on fragile willow saplings. Photosynthetic indicators of fragile willow were determined and analyzed under different drought stress. And the change of photosynthetic indicators of fragile willow after re-watering were observed. The results showed as follows:1) with the increase of drought stress, the net photosynthetic rate (Pn) of fragile willow saplings decreased significantly,stomatal conductance (Gs) and transpiration rate (Tr) overall decreased,and intercellular CO2 concentration (Ci) decreased at first and then increased. 2) After re-watering the sapling for 72 and 120 hours, the net photosynthetic rate (Pn), stomatal conductance (Gs),the intercellular CO2 concentration (Ci) and the transpiration rate (Tr) increased significantly. 3) Fragile willow adopted such a drought avoidance strategy as turning yellow,wilting,curling and drying off of leaves and wilting and sagging of terminal buds to cope with drought stress.
Pot experiments were conducted with 5 watering treatments (watering to 80% field capacity, then stopping watering,followed by drought stress of 16 days,12 days,8 days,4 days and 0 day) on fragile willow saplings. Photosynthetic indicators of fragile willow were determined and analyzed under different drought stress. And the change of photosynthetic indicators of fragile willow after re-watering were observed. The results showed as follows:1) with the increase of drought stress, the net photosynthetic rate (Pn) of fragile willow saplings decreased significantly,stomatal conductance (Gs) and transpiration rate (Tr) overall decreased,and intercellular CO2 concentration (Ci) decreased at first and then increased. 2) After re-watering the sapling for 72 and 120 hours, the net photosynthetic rate (Pn), stomatal conductance (Gs),the intercellular CO2 concentration (Ci) and the transpiration rate (Tr) increased significantly. 3) Fragile willow adopted such a drought avoidance strategy as turning yellow,wilting,curling and drying off of leaves and wilting and sagging of terminal buds to cope with drought stress.
2014, 35(5): 45-48.
doi: 10.16779/j.cnki.1003-5508.2014.05.010
Abstract:
In order to investigate the effects of shading on the growth and development of Davidia involucrata seedlings,a comparative study was made of the photosynthetic characteristics and growth characteristics of D. involucrata seedlings. The one-year old D. involucrata seedlings cultivated were used as experimental materials under different light intensity (100%,50% and 25%). The results showed that (1) the daily net photosynthetic rates of different shading treatments of D. involucrata seedlings were all bimodal curves and "Midday depression" phenomenon was observed. But under different light intensity the value and time of the peak were different. The daily variation trend of transpiration rate under different light intensity was different and in an order of one-layer shading (5%) > two-layer shading (25%) > full sunlight.. (2) The average leaf area,specific leaf area and leafstalk length of Davidia involucrate under shading were larger than those of Davidia involucrate under full sunlight. It indicated that Davidia involucrate had strong ability of utilizing the limited low light resource. This study showed that Davidia involucrata seedlings grew best under appropriate shading(50% Transmittance).
In order to investigate the effects of shading on the growth and development of Davidia involucrata seedlings,a comparative study was made of the photosynthetic characteristics and growth characteristics of D. involucrata seedlings. The one-year old D. involucrata seedlings cultivated were used as experimental materials under different light intensity (100%,50% and 25%). The results showed that (1) the daily net photosynthetic rates of different shading treatments of D. involucrata seedlings were all bimodal curves and "Midday depression" phenomenon was observed. But under different light intensity the value and time of the peak were different. The daily variation trend of transpiration rate under different light intensity was different and in an order of one-layer shading (5%) > two-layer shading (25%) > full sunlight.. (2) The average leaf area,specific leaf area and leafstalk length of Davidia involucrate under shading were larger than those of Davidia involucrate under full sunlight. It indicated that Davidia involucrate had strong ability of utilizing the limited low light resource. This study showed that Davidia involucrata seedlings grew best under appropriate shading(50% Transmittance).
2014, 35(5): 49-53.
doi: 10.16779/j.cnki.1003-5508.2014.05.011
Abstract:
Survey was made of the density of Tomicus brevipilosus (Eggers) in trunk. The aggregated indices and regression analyses showed that the spatial distribution patterns of Tomicus brevipilosus (Eggers) was a aggregated distribution. The regression equation was established based on different position population density in trunk and sample average population density,and the best sampling position was the south of trunk. At the same time, the best sampling table, sequential sampling plan and the maximum sampling amount were determined.
Survey was made of the density of Tomicus brevipilosus (Eggers) in trunk. The aggregated indices and regression analyses showed that the spatial distribution patterns of Tomicus brevipilosus (Eggers) was a aggregated distribution. The regression equation was established based on different position population density in trunk and sample average population density,and the best sampling position was the south of trunk. At the same time, the best sampling table, sequential sampling plan and the maximum sampling amount were determined.
2014, 35(5): 54-58.
doi: 10.16779/j.cnki.1003-5508.2014.05.012
Abstract:
Xiaozhaizigou Nature Reserve in beichuan County there were found one genus of Aceraceae family plants including 13 species, subspecies 1 and 2 varieties. They accounted for 11% of the total Aceraceae plant species in China,and 36% of Aceraceae plant species in Sichuan. Among them,13 species were endemic to China,3 species were endemic to Sichuan. On the basis of Aceraceae plant resource survey and analysis,a description was given of its exploitation value and it was suggested to strengthen the protection of wild resources, and the introduction of domesticated and selective seed research, aiming to realize development of Aceraceae plants resources.
Xiaozhaizigou Nature Reserve in beichuan County there were found one genus of Aceraceae family plants including 13 species, subspecies 1 and 2 varieties. They accounted for 11% of the total Aceraceae plant species in China,and 36% of Aceraceae plant species in Sichuan. Among them,13 species were endemic to China,3 species were endemic to Sichuan. On the basis of Aceraceae plant resource survey and analysis,a description was given of its exploitation value and it was suggested to strengthen the protection of wild resources, and the introduction of domesticated and selective seed research, aiming to realize development of Aceraceae plants resources.
2014, 35(5): 59-64.
doi: 10.16779/j.cnki.1003-5508.2014.05.013
Abstract:
Communication behavior of animals is very important for their survival. Its main features are identification (including individual identification,species identification,population identification and social class identification),breeding,alarming and so on. Visual communication,acoustic communication,chemical communication and tactile communication are the common means of communication used by the animal. Among them,the sound signal has such many good traits as long distance propagation, high speed, without leaving any traces and so on. When the visual signal does not work (at night or in jungle), the sound signal also can effectively convey information.. So, acoustic communication is widespread in animals. In recent years,the literature of animal acoustic communication research has gradually increased, the giant panda (Ailuropoda melanoleuca) acoustic communication has become a research hotspot. This paper reviews the animal acoustic communication and the latest correlation research of giant pandas and deals with application prospects of these researches in the giant panda conservation.
Communication behavior of animals is very important for their survival. Its main features are identification (including individual identification,species identification,population identification and social class identification),breeding,alarming and so on. Visual communication,acoustic communication,chemical communication and tactile communication are the common means of communication used by the animal. Among them,the sound signal has such many good traits as long distance propagation, high speed, without leaving any traces and so on. When the visual signal does not work (at night or in jungle), the sound signal also can effectively convey information.. So, acoustic communication is widespread in animals. In recent years,the literature of animal acoustic communication research has gradually increased, the giant panda (Ailuropoda melanoleuca) acoustic communication has become a research hotspot. This paper reviews the animal acoustic communication and the latest correlation research of giant pandas and deals with application prospects of these researches in the giant panda conservation.
2014, 35(5): 65-69.
doi: 10.16779/j.cnki.1003-5508.2014.05.014
Abstract:
Endangered plant Magnolia sargentiana is Chinese endemic species. In the year 2006,investigations were made on the habitats of wild Magnolia sargentiana in Sichuan and Yunnan provinces. It was found that there were 379 species of vascular plants,belonging to 104 families, and 233 genera, of which 17 families,26 genera and 39 species were ferns, meanwhile 87 families, 207 genera, and 340 species were seed plants. Besides analysis was made of the distribution types of families and genera of seed plants in the habitat of Magnolia sargentiana. The results showed that flora of seed plants in the habitat of Magnolia sargentiana was complex and abundant. The their origin was ancient and belonged to temperate zone,but the transitivity of flora was remarkable. Magnolia sargentiana had a limited distribution,and was only distributed in some areas of Sichuan and Yunnan provinces. The study of the habitat of Magnolia sargentiana would provide an important basis for its conservation.
Endangered plant Magnolia sargentiana is Chinese endemic species. In the year 2006,investigations were made on the habitats of wild Magnolia sargentiana in Sichuan and Yunnan provinces. It was found that there were 379 species of vascular plants,belonging to 104 families, and 233 genera, of which 17 families,26 genera and 39 species were ferns, meanwhile 87 families, 207 genera, and 340 species were seed plants. Besides analysis was made of the distribution types of families and genera of seed plants in the habitat of Magnolia sargentiana. The results showed that flora of seed plants in the habitat of Magnolia sargentiana was complex and abundant. The their origin was ancient and belonged to temperate zone,but the transitivity of flora was remarkable. Magnolia sargentiana had a limited distribution,and was only distributed in some areas of Sichuan and Yunnan provinces. The study of the habitat of Magnolia sargentiana would provide an important basis for its conservation.
2014, 35(5): 70-75,107.
doi: 10.16779/j.cnki.1003-5508.2014.05.015
Abstract:
Taiwan is located in the southeastern margin of the mainland, lying in the Pacific seismic belt and the volcano belt, including Taiwan Island, Penghu islands and 86 islands. Taiwan is rich in forest resources. But its forest resources had gotten heavy deforestation and loss in the period of Japanese rule. After the victory of Anti-Japanese War, its forest protection and management underwent through a series of resource recovery process. In the 1970's, along with its economic takeoff, the ecologic benefit of the forest was evident and therefore the harvesting of forest resources gradually reduced. Until the 1980's, the state-owned forest harvesting stopped, and the protection and management of forest resources in Taiwan began to move in ecological conservation, forest recreation, city forest, community forestry development. Successful experience of the protection and management of forest resources in Taiwan has a certain reference value for Sichuan Province in forest resource protection,management and protection of the ecological environment and sustainable development.
Taiwan is located in the southeastern margin of the mainland, lying in the Pacific seismic belt and the volcano belt, including Taiwan Island, Penghu islands and 86 islands. Taiwan is rich in forest resources. But its forest resources had gotten heavy deforestation and loss in the period of Japanese rule. After the victory of Anti-Japanese War, its forest protection and management underwent through a series of resource recovery process. In the 1970's, along with its economic takeoff, the ecologic benefit of the forest was evident and therefore the harvesting of forest resources gradually reduced. Until the 1980's, the state-owned forest harvesting stopped, and the protection and management of forest resources in Taiwan began to move in ecological conservation, forest recreation, city forest, community forestry development. Successful experience of the protection and management of forest resources in Taiwan has a certain reference value for Sichuan Province in forest resource protection,management and protection of the ecological environment and sustainable development.
2014, 35(5): 76-79,22.
doi: 10.16779/j.cnki.1003-5508.2014.05.016
Abstract:
2014, 35(5): 80-83,44.
doi: 10.16779/j.cnki.1003-5508.2014.05.017
Abstract:
On the basis of collecting data monitored from 2006 to 2009, investigations were made of traits of staple bamboos and the habitat for giant pandas in the Baihe Nature Reserve in 2012. The results indicated that the earthquake had minor negative effects on bamboos and the habitat except the bamboo growing in altitudes of 1 500 m~2 000 m. Human disturbance intensity increased especially in the areas with an elevation of 2 500 m~3 000 m. Bamboos did not naturally regenerate well in the area of elevation with 1 500 m~2 000 m. The bamboo growth became worse, and human disturbance intensity was stronger than before the earthquake.
On the basis of collecting data monitored from 2006 to 2009, investigations were made of traits of staple bamboos and the habitat for giant pandas in the Baihe Nature Reserve in 2012. The results indicated that the earthquake had minor negative effects on bamboos and the habitat except the bamboo growing in altitudes of 1 500 m~2 000 m. Human disturbance intensity increased especially in the areas with an elevation of 2 500 m~3 000 m. Bamboos did not naturally regenerate well in the area of elevation with 1 500 m~2 000 m. The bamboo growth became worse, and human disturbance intensity was stronger than before the earthquake.
2014, 35(5): 84-87.
doi: 10.16779/j.cnki.1003-5508.2014.05.018
Abstract:
Landsat 8 images acquired on 20th of April in 2013 were used to extract vegetation information through a spectral mixture model in this research. Taking Chengdu city as an example, primary image was transferred into 7 bands through minimum noise fraction analysis and the first three bands were used to calculate the pure pixels. Four members including low-albedo building, high-albedo building, vegetation, and soil were selected as the input variables of land cover class terminal. Finally the vegetation coverage images in the study area were estimated.
Landsat 8 images acquired on 20th of April in 2013 were used to extract vegetation information through a spectral mixture model in this research. Taking Chengdu city as an example, primary image was transferred into 7 bands through minimum noise fraction analysis and the first three bands were used to calculate the pure pixels. Four members including low-albedo building, high-albedo building, vegetation, and soil were selected as the input variables of land cover class terminal. Finally the vegetation coverage images in the study area were estimated.
2014, 35(5): 88-91,28.
doi: 10.16779/j.cnki.1003-5508.2014.05.019
Abstract:
To explore the soil nutrients distribution of different land use types, studies were made of the soil nutrients of Eriobotrya japonica woodland, vegetable field and grassland land in this paper. The results showed that the organic matter content in 0~10 cm soil was the highest in grassland and the next was in E. japonica woodland and vegetable field while that in 10 cm~20 cm soil was the highest in E. japonica woodland and the next was in the vegetable field and the grassland. In 0~10 cm soil, total N and available N were the highest in the vegetable field, the next was in the grassland and E. japonica woodland, total P and available P were the highest in the grassland, the next was in the vegetable field and E. japonica woodland, total K was the highest in vegetable field, the next was in the E. japonica woodland and grassland while available K was the highest in vegetable field,and the next was in the grassland and E. japonica woodland. As to total N content in 10 cm~20 cm soil, the order was the vegetable field > the E. japonica woodland > the grassland. As to the content of available N, total P and available P in the soil,the order was the E. japonica woodland > the vegetable field > the grassland. As to total K content in the soil,the order was the vegetable field > the E. japonica woodland > the grassland. As to available K content in the soil, the order was the grassland > the vegetable field > the E. japonica woodland. Therefore it indicated that the land use types had significant effect on the distribution of soil nutrients.
To explore the soil nutrients distribution of different land use types, studies were made of the soil nutrients of Eriobotrya japonica woodland, vegetable field and grassland land in this paper. The results showed that the organic matter content in 0~10 cm soil was the highest in grassland and the next was in E. japonica woodland and vegetable field while that in 10 cm~20 cm soil was the highest in E. japonica woodland and the next was in the vegetable field and the grassland. In 0~10 cm soil, total N and available N were the highest in the vegetable field, the next was in the grassland and E. japonica woodland, total P and available P were the highest in the grassland, the next was in the vegetable field and E. japonica woodland, total K was the highest in vegetable field, the next was in the E. japonica woodland and grassland while available K was the highest in vegetable field,and the next was in the grassland and E. japonica woodland. As to total N content in 10 cm~20 cm soil, the order was the vegetable field > the E. japonica woodland > the grassland. As to the content of available N, total P and available P in the soil,the order was the E. japonica woodland > the vegetable field > the grassland. As to total K content in the soil,the order was the vegetable field > the E. japonica woodland > the grassland. As to available K content in the soil, the order was the grassland > the vegetable field > the E. japonica woodland. Therefore it indicated that the land use types had significant effect on the distribution of soil nutrients.
2014, 35(5): 92-93,53.
doi: 10.16779/j.cnki.1003-5508.2014.05.020
Abstract:
2014, 35(5): 94-97,69.
doi: 10.16779/j.cnki.1003-5508.2014.05.021
Abstract:
The forest fire in dry-hot valleys in Liangshan area is very serious,which has certain seasonal, and is difficult to be put out. This paper deals with the causes of forest fires in this area by field investigation, literature consultation, qualitative analysis, etc. And it is concluded that forest fires in this region are mainly caused by human factors. And therefore such control measures as publicity education, management, regulation, engineering and so on are put forward for forest fire prevention.
The forest fire in dry-hot valleys in Liangshan area is very serious,which has certain seasonal, and is difficult to be put out. This paper deals with the causes of forest fires in this area by field investigation, literature consultation, qualitative analysis, etc. And it is concluded that forest fires in this region are mainly caused by human factors. And therefore such control measures as publicity education, management, regulation, engineering and so on are put forward for forest fire prevention.
2014, 35(5): 98-101.
doi: 10.16779/j.cnki.1003-5508.2014.05.022
Abstract:
Through the current status investigation of the ancient and valuable trees among the six counties and two districts of Ya'an, it was found out that the existing amount, types, distribution and other status of the ancient and valuable trees. Analysis was made of the current situation and problems in protecting the ancient trees. Besides, a discussion was made on the technical measures related to the ancient and valuable trees' protection management under the current circumstance.
Through the current status investigation of the ancient and valuable trees among the six counties and two districts of Ya'an, it was found out that the existing amount, types, distribution and other status of the ancient and valuable trees. Analysis was made of the current situation and problems in protecting the ancient trees. Besides, a discussion was made on the technical measures related to the ancient and valuable trees' protection management under the current circumstance.
2014, 35(5): 102-107.
doi: 10.16779/j.cnki.1003-5508.2014.05.023
Abstract:
2014, 35(5): 108-111.
doi: 10.16779/j.cnki.1003-5508.2014.05.024
Abstract:
In this paper, studies were made of the present situation of Dengsheng Conservation Station in National Wolong Nature Reserve,and existent problems were analysized in detail. Besides, some relevant suggestions were put forward for solving them.
In this paper, studies were made of the present situation of Dengsheng Conservation Station in National Wolong Nature Reserve,and existent problems were analysized in detail. Besides, some relevant suggestions were put forward for solving them.
2014, 35(5): 112-113,116.
doi: 10.16779/j.cnki.1003-5508.2014.05.025
Abstract:
2014, 35(5): 114-116.
doi: 10.16779/j.cnki.1003-5508.2014.05.026
Abstract:
