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2021 Vol. 42 Issue 4

2021 Vol. 42, No. 4

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Research Reports
Development Characteristics of Chinese Fir Microspores and its Application in Cross Breeding
HUANG Zhen, LI Qiang, LI Yuhua, LI Jiaman, CHEN Zhi, YANG Yongzhi, MU Changlong
2021, 42(4): 1-4. doi: 10.12172/202012290003
Abstract:
Using the mother plant of Sichuan Cunninghamia lanceolata seed orchard as the test material, the corresponding relationship between the external morphological development of spring male cones, microstrobilus and the development of microspores were observed. The results showed that the development of microsporophyll on the same microstrobilus was basically synchronized. The color and length of microsporophyll were closely related to the development of microspores. When the whole microstrobilus was blue and up to 5 mm long, the internal microspores were basically in the tetrad stage. When the scales among the microsporophylls lost water and turned yellow and the wall of the microsporangia turned light yellow, the internal microspores were basically at the stage of mononuclear. After collecting the male cones with the microstrobiluses in this state and placing them in a dry greenhouse for 12—24 hours, a large number of mature and vigorous pollen could be harvested.
Research Reports
Study on Landscape Pattern Characteristics and Conservation Strategies of Giant Panda Habitat in the Minshan Mountains of Sichuan Province
TANG Mingkun, XU Ge, FENG Yong, LIU Liang, ZHOU Dasong, CHEN Zhixing, YANG Jing, WANG Lian, WANG Xin
2021, 42(4): 5-11. doi: 10.12172/202012060003
Abstract:
Based on forest land survey data in recent years, the landscape pattern characteristics of the giant panda habitat and potential habitat range were studied, in the Minshan Mountains of Sichuan province. The results showed that: (1) As the landscape type with the largest distribution of giant panda activity trace points, coniferous forest and broad-leaved forest showed the characteristics of the lowest fragmentation, the most complex patch shape, highest patch aggregation and connectivity, and strong stability, indicating that the quality of giant panda habitat of the study area was good and with high naturalness. (2) The distribution area of artificial economic forest, cultivated land and construction land accounted for 5%. These landscape types had high intensity of human activities and were scattered throughout the whole research area, bringing continuous disturbance to the giant panda habitat. (3) With the decrease of the average altitude and the increase of the disturbance intensity, the landscape pattern in the study area showed a trend of increasing fragmentation, mixing degree, diversity and evenness, and decreasing landscape quality and function from north to south. Some protection and management measures were put forward, such as implementing the policy of returning farmland to forest, transforming artificial forest, controlling the scale of construction land in the giant panda habitat and changing the production and life style of the indigenous people, so as to gradually recover and improve the quality of the giant panda habitat,.
Research Reports
Study on Suitable Habitat and Activity Rhythm of Trgopan temminckii in Wolong National Nature Reserve
FENG Xi, HU Qiang, SHI Xiaogang, WANG Maolin, QU Chunmao, JIN Senlong
2021, 42(4): 12-19. doi: 10.12172/202012080001
Abstract:
In this study, the relevant information about Trgopan temminckii collected by infrared camera survey in Wolong National Nature Reserve from 2014 to 2019 was collected, and species distribution model (MaxEnt) was used to predict the suitable habitat of Trgopan temminckii in the Nature Reserve. The difference of activity rhythm in spring, summer, autumn and winter was analyzed using kernel density estimation method. The results showed that in Wolong National Nature Reserve, the predicted suitable habitat for Trgopan temminckii was 430.38 km2, accounting for 21.52% of the total area of the reserve, which was mainly distributed in the coniferous and broad-leaved mixed forest at middle and low altitude on both sides of Pitiao River in the reserve. In terms of activity rhythm, the highest activity intensity of Trgopan temminckii was in spring followed by autumn and summer, and the lowest in winter. The daily activity rhythm of Trgopan temminckii in autumn was significantly different from that in spring, summer and winter, but there was no significant difference between spring, summer and winter. This study preliminarily identified the potential suitable habitat distribution of Trgopan temminckii in Wolong National Nature Reserve and the difference of activity rhythm in spring, summer, autumn and winter, which provided scientific basis for the conservation and management of Trgopan temminckii and other Phasianidaes distributed in the same area in the reserve.
Ecological Development
Analysis on Dynamic Change of Natural Forest Resources in Sichuan Province
WANG Hongrong, ZHANG Wen, LIU Bo, WANG Jijie
2021, 42(4): 20-25. doi: 10.12172/202012270001
Abstract:
In order to understand the resource status of natural forest in Sichuan province, identify the cause and the evolution law of natural forest resources, and provide important reference and scientific basis for the protection and restoration of natural forest in Sichuan province. In this paper, the data of natural forest resources in the whole province from 1979 to 2017 were deeply analyzed. The results showed that the area, volume and unit volume of natural forest increased on the whole, and the area and unit volume showed a trend of ‘decreasing-increasing-decreasing’, and the overall volume increased with time. The age group structure of natural forest was unbalance, and the proportion of nearly-mature forest and mature and over-mature forest was out of balance. The area and volume ratio of non-commercial forest and commercial forest changed from 3∶7 to 8∶2 and 1∶9 to 9∶1, respectively. The area ratio of coniferous forest and broadleaved forest changed from 10∶0 to 6∶4. Therefore, improving the quality of natural forest, optimizing the age group structure, and strengthening the tending of young and middle-aged forest and nearly-mature forest were the key points for natural forest protection in our province.
Ecological Development
Soil Nutrient Characteristics of Phoebe zhennan Plantation at Regional Scale
TANG Jie, LIN Zifang, WANG Xiaoqin, CHENG Yilun, PENG Jian, WANG Fang, YANG Hanbo, GU Yunjie
2021, 42(4): 26-34. doi: 10.12172/202103030001
Abstract:
To analyze the effects of regions and age groups on soil properties of Phoebe zhennan plantation, the soil characteristics of P. zhennan plantation on regional scale were discussed from soil nutrients perspective, which could provide a basis for the accurate evaluation of sustainable forest management and site quality. Different regions and age groups of P. zhennan plantation in Sichuan province were selected as the research objects. The soil samples were collected by S-shaped sampling method and the nutrients were analyzed at two soil depths (0—20 cm and 20—40 cm). The general linear model, correlation analysis, principle components and other multivariate statistical methods were combined to explore the differences and relationships of soil nutrient factors of P. zhennan plantation in different regions and different age groups. The results showed that there were significantly differences of soil total nitrogen, total phosphorus, total potassium, calcium and magnesium contents in P. zhennan plantation in different areas of Sichuan (P<0.05), and there was no significantly difference in soil organic carbon. There was no significant difference in all nutrient factors among different age groups. With the increase of soil depth, the nutrient content represented a decreasing trend, and showed surface accumulation. There was a positive correlation between organic carbon and total nitrogen content, while other nutrient properties had no significant correlation. According to the results of principle components analysis, the top three comprehensive scores of soil nutrient of P. zhennan plantation were Yingjing county of Ya'an city, E’meishan of Leshan city, and Yucheng district of Ya'an city, respectively, Therefore, sustainable management of P. zhennan plantation should be carried out base on the characteristics of soil nutrients in different regions.
Ecological Development
Effects of Different Stand Types on Soil Chemical Properties in Rainy Zone of West China
LAI Shihui, JIANG Quanfu, JIA Chen, YAN Xianchun
2021, 42(4): 35-40. doi: 10.12172/202101050001
Abstract:
In order to explore different forest types effects on soil chemical properties, four stand types, namely pure Cunninghamia lanceolata forest, pure Cryptomeria fortunei forest, pure Liriodendron chinense forest and Cryptomeria fortune × Phoebe zhennan mixed forest, were selected as the research objects, and the difference of soil chemical properties and the organic contents of different forest types were analyzed by variance analysis. The results showed that there were significant differences in soil pH, available potassium, total phosphorus, total potassium and total nitrogen among different forest types, but there were no significant differences in available phosphorus, alkali-hydrolyzable nitrogen, and soil organic matter. The soil pH value of the four forest stands was between 4.02 and 5.33, which was acidic, and increased with the increase of soil depth. The contents of soil organic matter, total nitrogen, total phosphorus, alkali-hydrolyzable and available phosphorus in different forests types all decreased with the increase of the soil depth. The 0~10cm total phosphorus content of soil in four different forest stands was higher than that of 10~20 cm. The soil total potassium content of pure C. lanceolata forest, pure C. fortunei forest and pure L. chinense forest all fluctuated up and down with the increase of the soil depth, while the content of C. fortune × P. zhennan mixed forest increased gradually. The contents of soil alkali-hydrolyzable nitrogen and available phosphorus in soil of four forest stands all decreased with the increase of soil depth. The soil available potassium content of pure C. lanceolata forest and pure C. fortunei forest increased first and then decreased, while that of pure L. chinense forest and C. fortune × P. zhennan mixed forest increased gradually. The average phosphorus supply intensity of the four stands at the soil layer of 0~10cm, 10~20cm, 20~40cm and 40~60cm was 2.64%, 2.71%, 2.57% and 2.61%, respectively. Soil K supply intensity of pure L. chinense forest and C. fortunei × P. zhennan mixed forest increased with the increase of soil layer, while that of pure C. fortunei forest first increased and then decreased.
Ecological Development
Study on Population Distribution and Breeding Characteristics of Firmiana major in Sichuan Panzhihua Cycas National Nature Reserve, Sichuan Province
LEI Chehong, YU Zhixiang, XIE Dajun, YANG Yongqiong, PAN Jing, LI Huan, FAN Shuyi, GONG Lili, SUN Hua
2021, 42(4): 41-46. doi: 10.12172/202103020001
Abstract:
Based on the resource investigation of Firmiana major found in Panzhihua Cycas National Nature Reserve, Sichuan province, the flowering characteristics, seed traits and sprouting ability were studied, and the status to endangerment was discussed. A total of 417 F. major trees were recorded in the investigation, which were multi-stem sprouting plants with 2 to 5 sprouted stems per plant, and the height of the trees was 1—3 m. No live seedlings were found in the survey area. The flowering period of F. major was from early June to mid-July, and the ripening period was from mid to late September. The 1000-seed weight was 227.18 g, the seed plumpness was 48.44%, the fresh seed germination rate was 31.9% in the field, and there was no germination ability after the next rainy season. After low-intensity fire, the above-ground parts of F. major gradually die, and many sprouting strips sprouted around the root diameter in rainy season of that year. It was found that the decline of genetic diversity and insufficient success rate of pollination led to the decline of fertility, the poor seed quality and loss of seeds led to low conversion rate of seeds to seedlings, and the lack of adaptability and weakened competitiveness led to the decline of population viability, which caused the difficulty of natural regeneration of F. major and important reasons for its endangerment. Under the harsh habitat conditions of the dry-hot valley, the regeneration of sprouting tillers was an important way to preserve and continue the wild populations of F. major.
Ecological Development
Spatial Pattern of Soil Fertility and its Influencing Factors in Longquan Mountain Urban Forest Park, Chengdu City
XIE Chuan, CHEN Junhua, XIE Tianzi, LIN Jing, ZHAO Haotian, JIANG Yuxuan, LUO Zongshi, MU Changlong
2021, 42(4): 47-54. doi: 10.12172/202012140003
Abstract:
Exploring the spatial pattern and impact factors of soil fertility in Longquan Mountain Urban Forest Park can better guide the planning and management of the park, and provide scientific basis for ecological restoration and landscape configuration in this area. In this study, the spatial pattern of soil fertility in Longquan Mountain Urban Forest Park and its influencing factors were investigated and analyzed by sampling grid distribution points and combining the modified Nemerow formula as a quantitative calculation model of soil fertility. Our results were as follows: (1) The average content of available P was at the first level of the soil nutrient classification standard in the second national soil survey of China, while the average content of available K reached the forth level. The average content of soil organic matter and alkali-hydrolyzable nitrogen were both at the fifth level. (2) From the spatial pattern, the regions with good soil fertility were mainly distributed in the north of the study area, while that the poor soil fertility was mainly distributed in the central and southern part of the park. (3) The order of the soil comprehensive fertility index of different topography and land use types was plain > hill > low mountain, flat slope > gentle slope>slope > steep slope; for slope, the order was northwest > west > east > south > north > southwest > northwest > no slope direction > southeast; for slope position, the order was lower > middle=upper > valley department > the ground > the back; for land uses pattern, the order was cultivated land > orchard > bamboo land > mixed forest > pure forest > abandoned land > homestead land. Based on the soil comprehensive soil fertility status of Longquan Mountain Urban Forest Park, the areas with the soil fertility index of “good” should be protected, the areas with the soil fertility index of “medium” should be monitored and the natural restoration ability should be improved, the areas with the soil fertility index of “poor” should be mightily improved.
Ecological Development
Ecological Stoichiometry Characteristics of C, N and P in Different Organs of Quercus wutaishansea Mary in the Bailong River
HUANG Kun, CAO Xiuwen, LIU Jinqian, ZHANG Tao, WANG Fei, HUANG Xudong
2021, 42(4): 55-60. doi: 10.12172/202011270001
Abstract:
In order to understand the ecological stoichiometry characteristics of C, N and P in different organs of Quercus wutaishansea Mary in Bailong River region, 16 sample plots of Q. wutaishansea Mary were set up by the typical sampling method, and the samples of roots, branches and leaves were collected to analyze the contents of C, N and P. The results showed that: (1) The content of C in each organ of Q. wutaishansea was leaves (517.36 g·kg−1) > roots (411.39 g·kg−1) > branches (392.87 g·kg−1); for N content, the order was leaves (19.51 g·kg−1) > branches (6.09 g·kg−1) > roots (5.82 g·kg−1); for P content, the order was leaves (1.75 g·kg−1) > branches (1.03 g·kg−1) > roots (0.61 g·kg−1), and most of the three nutrients were distributed in the leaves. (2) The variation of C in each organ species was weak relative to N and P, and the maximum coefficient of variation was P content in the root. (3) The range of C∶N in each organ was 28.15 to 69.93, with the largest in root and the smallest in the leaf. C∶P ranged from 311.33 to 814.25, with the smallest in leaf and the largest in root. N∶P ranged from 6.41 to 12.07, with the smallest in branch and the largest in root. (4) C was positively correlated with N and N∶P, while C is negatively correlated with C∶N. N was significantly correlated with C, P, C∶N, C∶P and N∶P, and positively correlated with P and N∶P. P content was significantly correlated with N, C∶N and C∶P, and negatively correlated with C∶N and C∶P. C∶N was positively correlated with C∶P, negatively correlated with N∶P, and positively correlated with C∶P. Thus the content of nutrient elements in organs of Q. wutaishansea in this region was closely related to the functional structure of corresponding organs.
Ecological Development
Research on Species Diversity of Pinus radiata Plantation under Different Afforestation Models in Dry-hot Valley of the Minjiang River
HE Wei, LI Tian, ZHANG Wei, WU Shilei, SU Yu, YAN Wuxian, YOU Jiyong
2021, 42(4): 61-67. doi: 10.12172/202012010001
Abstract:
According to the field experiment, the species diversity of Pinus radiata pure forest, Pinus radiata and Cupressus chengiana mixed forest, Pinus radiata, Cupressus chengiana and Robinia pseudoacacia mixed forest was studied in Wenchuan, Lixian and Maoxian dry-hot valleys of the Minjiang River. The results showed that: (1) Ailanthus altissima was the common accompanying tree species in the tree layer of P. radiata plantation, Lespedeza bicolor was the dominant species in the shrub layer, and Artemisia had great regeneration potential in the herb layer. The species richness was in the order of herb layer > shrub layer > tree layer, and Asteraceae, Gramineae and Leguminosae were the dominant species under the forest. (2) During the time of 5—20 years, with the extension of time, the growth of average tree height and diameter at breast height (DBH) of P. radiata pure forest increased, but the number of shrub and herb species and vegetation coverage decreased gradually. The growth of average tree height and DBH of P. radiata and C. chengiana mixed forest was low, and the number of shrub and herb species under the forest had little change. The growth of average tree height and DBH of P. radiata, C. chengiana and R. pseudoacacia mixed forest increased slowly, but the species diversity and biomass of shrub and herb under the forest showed an upward trend. (3) In the practice of afforestation in the dry-hot valley of the Minjiang River, P. radiata, C. chengiana and R. pseudoacacia mixed forests with suitable density could be used as the main afforestation model. For the P. radiata pure forests to be tending, native tree species such as R. pseudoacacia, A. altissima and L.bicolor were preferred to be replanted after thinning to increase species diversity.
Forestry Industry
Genetic Analysis of Growth Characteristics of Acer catalpifolium Half-sib Family at Seedling Stage
LI Jiaman, LU Jialin, HE Chunju, CAO Kunbin, CHEN Zhi, HUANG Zhen
2021, 42(4): 68-72. doi: 10.12172/202012050002
Abstract:
In order to provide reference for the protection and development of Acer catalpifolium, the growth performance of Acer catalpifolium at seedling stage was studied, and the families with good growth traits at the seedling stage were screened. Fifteen half-sib families of Acer catalpifolium were used as the research object, the growth of seedling height and ground diameter traits were analyzed and compared. The results showed that there were significant differences in seedling height and ground diameter of half-sib families of Acer catalpifolium. The family heritability of seedling height and ground diameter was greater than 0.9. There was a significant positive correlation between seedling height and ground diameter. The genetic coefficients of seedling height and ground diameter reached 30.59% and 29.06%, respectively, with great potential for genetic improvement. Two excellent half-sib families were screened.
Forestry Industry
Effects of Sod-culture on Soil Nutrients and Microbial Abundance in Zanthoxylum bungeanum Plantation
LI Peihong, ZENG Pan, GONG Xia, TANG Wei, CHEN Zheng
2021, 42(4): 73-77. doi: 10.12172/202012100002
Abstract:
In order to study the impacts of sod-culture on soil nutrients and soil microorganisms under Zanthoxylum bungeanum plantation, white clover was planted and natural weeds were cultivated, and the changes of soil nutrients and soil microorganisms were studied with clear tillage as control. The results showed that the effect of grass on soil nutrients and microbial abundance was mainly in 0~20 cm soil layer in Zanthoxylum bungeanum plantation. Grass increased the content of soil organic matter, some nutrient elements, the microbial abundance in soil, and changed the population structure of microorganisms. At the early stage of grass growing, the consumption of soil water and nitrogen fertilizer may be great, so scientific management combined with agricultural measures should be carried out according to the growth characteristics of Zanthoxylum bungeanum.
Forestry Industry
Study on Genetic Relationship of Genus Corylus Resources in Sichuan Province Based on SSR Markers
WANG Zeliang, WU Bin, XING Wenxi, ZHENG Chongwen, LI Pijun
2021, 42(4): 78-82. doi: 10.12172/202012070002
Abstract:
At least seven domestic wild hazelnut species are distributed in Sichuan province, which is an important distribution area for genus Corylus resources. In this study, nine SSR markers were used to analyze the population genetic diversity and genetic relationships of C. heterophylla var. sutchuenensis, C. yunnanensis, C. ferox, C. mandshurica, and C. avellana. The results showed that the mean number of effective alleles, observed heterozygosity, expected heterozygosity, and Shannon's information index of eleven test populations were 2.772, 0.644, 0.546, and 1.016, respectively, indicating that the population genetic diversity was at a medium level. In addition, the population diversity level of C. heterophylla var. sutchuenensis in Maoxian county and of C. yunnanensis in Luding county were higher than the other populations. Meanwhile, principal coordinate analysis and UPGMA cluster analysis showed that C. mandshurica was closely related with C. avellana, and that C. heterophylla var. sutchuenensis was also closely related with C. yunnanensis. This study was helpful to promote the breeding, protection and utilization of hazelnut germplasm resources in Sichuan province.
Forestry Industry
Study on Callus Induction and Regeneration of Anthurium andraeanum Tiller Bud
LIU Liangmeng, LIU Xin, ZHAO Taojuan, CHEN Zhi, LI Jiaman, HUANG Zhen
2021, 42(4): 83-89. doi: 10.12172/202012150001
Abstract:
Using anthurium andraeanum tiller bud as explant, the methods of callus induction and regeneration at bud base were studied. The results showed that the sterile tiller seedlings could induce adamant callus with a diameter of 0.5—1.0 cm and hard texture in the medium of MS+0.5 mg/L 6-BA+0.05 mg/L NAA+30 g/L sucrose. The callus differentiated into buds in the medium of 1/2MS+0.2 mg/L 6-BA+0.05 mg/L NAA+ 30 g/L sucrose. On average, each callus had 6 effective buds. When the buds were transferred to the medium of 1/2MS+0.2—0.5 mg/L IBA+20 g/L sucrose, they could develop into rooting seedlings with a height of 3 cm or more, with adventitious roots and aerial roots.
Forestry Industry
Study on Adaptability of Hibiscus mutabilis Germplasm Resources in Chengdu Region
SHI Xiaoqing, LI Fangwen, LIU Xiaoli, ZHU Zhangshun, ZENG Xinmei, LI Mengxia, CAI Lu, LIU Xiaodan, MA Jiao, YANG Yuanzhao
2021, 42(4): 90-93. doi: 10.12172/202012210001
Abstract:
The adaptability of 171 Hibiscus mutabilis resources from 14 provinces were studied in Chengdu. The results showed that: (1) Most of the resources (80.70%, distributed in the south of 32°06'53"N) had good adaptability in Chengdu area. (2) Among the preserved resources, the proportion of single petal type (including single-petal red, single-petal white and single-petal white to red) was 57.25%, which was slightly higher than that of double-petal resources (42.75%). (3) 63.04% of the preserved Hibiscus mutabilis resources were firm, of which 62.07% were single petal and 40.23% were from Fujian. These results will be of great significance for the conservation and popularization of Hibiscus mutabilis germplasm resources.
Forestry Industry
Climat Adaptability Assessment and Planting Division of Zanthoxylum bungeanum in Yanyuan County
JIN Yinchun, CHEN Wei, MAO Guohui, CHEN Shanbo, LUO Hui, WANG Lihua
2021, 42(4): 94-98. doi: 10.12172/202012120001
Abstract:
The dominant meteorological factors influencing the growth and development of Zanthoxylum bungeanum in Yanyuan county were determined by the principal component analysis method. Combined with climatic conditions and biological characteristics, the planting division was preliminarily determined. The results showed that: (1) The basic suitable climatic conditions for Zanthoxylum bungeanum in Yanyuan county were as follows: average annual temperature was 12~13.5 ℃, hottest average monthly temperature was 17.5~21 ℃, coldest average monthly temperature was 3~6.5 ℃, rainfall was 850-1100 mm, and annual sunshine hours were 2250~2600 h. (2) The suitable altitude range for Zanthoxylum bungeanum Maxim. ‘hanyuan’ was 2100~2700 m, and the optimum altitude was 2200~2550 m. (3) In terms of Zanthoxylum bungeanum planting division, the county was divided into suitable climate area, sub-suitable climate area and unsuitable climate area.
Forestry Industry
Effect of Different Substrates on Growth and Nutrient Absorption of Cinnamomum chekiangense Seedlings
SHENG Weixing, XU Zaieng, XU Yuliang, ZHOU Guan, Yang Jianxiang, WU Xiaoying
2021, 42(4): 99-106. doi: 10.12172/202012070001
Abstract:
Cinnamomum chekiangense is an important and precious tree species. In vigorously promoting precious tree species for the afforestation, the cultivation of high-quality container seedlings is the key to the success of afforestation, and the seedling substrate directly determines the quality of seedlings. In this paper, 1-year-old seedlings of C. chekiangense were selected as the research object, using potted culture method to study the effects of 5 substrates (yellow soil, sawdust, peat) on seedling plant height, ground diameter, biomass growth and accumulation of nitrogen, phosphorus and potassium, in order to screen out the suitable substrate ratio for the cultivation of the container seedlings of the C. chekiangense and provide the basis for the cultivation of high-quality container seedlings. The results showed that A3 (yellow soil∶peat∶sawdust=40∶30∶30) substrate was most conducive to the growth of C. chekiangense, and the plant height and ground diameter were significantly higher than A5 (P<0.05). The leaves, branches, roots and total biomass of C. chekiangense cultivated with A3 substrate were largest, which were 33.63, 39.57, 48.43, 121.64 g·plant−1, respectively; significantly higher than other treatments (P<0.05). The accumulation of nitrogen, phosphorus, and potassium in the whole plant of C. chekiangense cultivated with A3 substrate were the best, which were 3168.8, 137.3, 673.1 mg·plant−1 respectively; Gray correlation analysis method evaluation showed that A3 substrate was the best substrate for the growth of the C. chekiangense container seedlings.
Forestry Industry
Study on Screening of Waterlogging Tolerance Germplasm Resources of Zanthoxylum bungeanum
GONG Xia, CHEN Zheng, LI Peihong, TANG Wei, ZENG Pan, WU Yinming
2021, 42(4): 107-113. doi: 10.12172/202101060001
Abstract:
In order to screen out strong waterlogging tolerance germplasm resources of Zanthoxylum bungeanum, the growth and waterlogging damage of six Z. bungeanum germplasm materials selected by Sichuan academy of botanical engineering in the early stage were comprehensively evaluated through artificial flooding experiment. The results showed that under waterlogging stress, Chuanzhi-3 still maintained a large stress index of plant height and basal diameter growth, and the waterlogging symptoms appeared only after waterlogging stress for 66 h, with a waterlogging index of only 5.56%, and after waterlogging stress for 96 h, the waterlogging index was 55.56%. The average waterlogging index of each treatment was only 9.63%. The waterlogging symptoms of Chuanzhi-3 were much lighter than other materials, and the waterlogging tolerance was the strongest.
Review and Monograph
Research Progress on Biomass Conversion Catalyzed by Solid Acids
TANG Hongwei, HUANG Yijia, WU Bin
2021, 42(4): 114-121. doi: 10.12172/202011170002
Abstract:
Due to the impact of energy crisis and environmental pollution, the research of green solid acid catalysts in catalyzing the conversion of renewable biomass into various chemicals has become a hot spot in recent years. In this paper, the research progress of solid acid in biomass catalytic conversion was reviewed. Firstly, types of solid acids that could be used for biomass conversion were listed. Secondly, the research status of solid acid catalysts in catalyzing the biomass conversion to produce biomass fuels, biomass platform compounds and bio-based materials was introduced. Finally, the existing problems in the application were summarized, and then the suggestions and ideas for solving these problems were recommended.
Review and Monograph
Research Progress on Remote Sensing Extraction Method of Bamboo Forest Information
PU Mengxin, NI Zhongyun, ZHAO Yinbing, ZHOU Guoli, LIANG Jiafeng
2021, 42(4): 122-131. doi: 10.12172/202103090002
Abstract:
Research on remote sensing extraction method of bamboo forest information is beneficial to the development of bamboo forest ecological economic and the protection of ecological environment. In this paper, the development remote sensing extraction method of bamboo forest information was summarized into three stages, including traditional statistical recognition model, machine learning classification, and multi-source information composite classification. It was pointed out that due to the influences of bamboo forest growth characteristics, remote sensing data sources and remote sensing information extraction method, bamboo forest information extraction faced the difficulty of obtaining remote sensing data with high temporal and spatial resolution, the incompleteness of optical remote sensing information extraction, the difficulty of extracting bamboo forest information under the forest canopy, and the lack of precision of large spatial scale information extraction. Based on the development history, current situation and future development trend of bamboo forest information extraction, it is urgent to carry out more basic bamboo forest research, improve track sensors, realize dynamic monitoring of multi-source and multi-time series data, and deepen the cross-integration of various extraction methods.
Review and Monograph
Research Progress on Spatial and Temporal Variation Characteristics of Soil Respiration
ZHANG Meng, LU Jie, REN Yihua
2021, 42(4): 132-138. doi: 10.12172/202103200001
Abstract:
The research on soil respiration has already started as early as the 20th century, and the research in foreign countries started earlier than that in China. At present, many studies have found that soil respiration has great temporal and spatial changes. In order to understand and explore the temporal and spatial changes of soil respiration more accurately, the related articles at home and abroad were reviewed, sorted out, summed up and summarized. Temporal changes mainly included diurnal changes, seasonal changes and inter-annual changes. Spatial variability mainly included four aspects: community level, landscape level, regional scale and biotic scale. Altitude gradient also affected soil respiration.
Review and Monograph
Study on Driving Mechanism of Forest Fire Prevention Awareness Based on TPB Extended Model
LIN Weijun, LI Chunping, LI Zhemin
2021, 42(4): 139-144. doi: 10.12172/202101110001
Abstract:
Forest fire is one of the natural disasters that seriously endanger the living environment of human beings. Cultivating citizens' awareness of forest fire prevention behavior can effectively prevent the occurrence of forest fire. In this study, the TPB theory was selected as the basic framework, place attachment and moral norms were integrated into TPB theory, and structural equation model was used to explore the conceptual model. The results showed that: moral norms had positive driving effect on forest fire prevention awareness. Place attachment had positive driving effect on forest fire prevention awareness. Subjective norms and behavior attitudes had positive driving effect on forest fire prevention awareness. Income, length of residence and education level had positive driving effect on forest fire prevention awareness. Perceptual behavior control had no driving effect forest fire prevention awareness. Behavioral attitude was the core factor driving forest fire prevention awareness.
Review and Monograph
A Newly Recorded Species of Synotis alata (Compositae: Senecioneae) in Sichuan Province, China
YU Shuhua, LIU Xiaofeng, ZHANG Xun, WEI Xueping, HU Jun, HUANG Chunping, ZHOU Yi, XU Bo, FU Zhixi
2021, 42(4): 145-148. doi: 10.12172/202012060002
Abstract:
Based on field investigation and specimen identification, this paper reported a new distribution record species of Synotis alata, belonging to the genus Synotis (Compositae: Senecioneae), for the first time in Sichuan province, China. This paper provided detailed morphological description, newly recorded specimen and the geographical distribution in China. This finding further contributed to the richness of plant flora and traditional Chinese medicinal materials in Sichuan province.