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2022 Vol. 43 Issue 1

2022 Vol. 43, No. 1 Catalogue

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Research Reports
Research Progress and Trends of Natural Secondary Forests in China
LIU Xingliang, LIU Shan, CAI Lei, LI Xuhua, XU Zhengjingru, PAN Hongli, FENG Qiuhong, ZHANG Li, LIU Qianli
2022, 43(1): 1-11. doi: 10.12172/202112140001
Abstract:
The secondary forest is the main forest type formed after natural forest cutting, which is significantly different from the primary forest and artificial forest in many aspects, such as stand structure and species composition, forest growth and productivity, stand environment and ecological functions, etc. Therefore, studying the health diagnosis, classification and evaluation index, community structure and ecological functions, and soil ecological processes of the secondary forest ecosystem are of great significance for biodiversity protection, ecological security, ecological barrier construction and ecological civilization construction in China. Based on the extensive collection of the latest literature on secondary forest research at home and abroad, this paper discussed the diagnosis, classification and evaluation method of secondary forest, community structure and ecological function, as well as the impact of forest restoration process on secondary forest, etc. At the same time, this paper explained the basic scientific issues concerned in the research of secondary forests, and proposed future research directions for the secondary forest, which would provide scientific basis for the multi-purpose management of secondary forest, ecosystem management, and natural forest protection and restoration in China.
Research Reports
Comparison of Ochroma lagopus Swartz Growth and Soil Ecological Effects under Different Cultivation Modes
LIANG Mingyue, LIU Changan, HUA Shuai, DUAN Zhubiao
2022, 43(1): 12-18. doi: 10.12172/202104200003
Abstract:
The manufacture of modern large-scale wind turbine blades generally uses composite sandwich panels with balsa wood as the base materials, and with no alternative materials. The balsa wood in China is completely dependent on imports, and with the increasing demand of balsa wood and the uncertainty of Sino-foreign trade, the supply of balsa wood raw materials has become a “stuck neck” problem for wind power equipment manufacturing industry in China. In this study, the composite cultivation experiment was carried out with the balsa wood plantations constructed in May 2017, and the following cultivation models were constructed by using the cultivation techniques of ridge, furrow and film mulching with important cash crops in Xishuangbanna: balsa wood plantation (Q), balsa-soybean plantation (QD), balsa-soybean with plastic film plantation (QDF). Balsa wood plantation (CK), balsa-soybean/coriander plantation (QDX), balsa-soybean/coriander with plastic film plantation (QDXF). Through the measurement of soil nutrients, soil moisture content, balsa wood DBH growth and volume volume, the sustainable cultivation mode of balsa wood in Xishuangbanna was explored to provide theoretical basis and technical support for the localization of balsa wood raw materials. The results showed that the diameter at breast height (DBH) of balsa wood could reach 23 cm after growing for 2 years and 8 months, which can meet the requirements of manufacturers (DBH > 20 cm). After 3 years and 8 months, the DBH could reach 26 cm, and the increase of volume was over 30%. In order to obtain high income, balsa wood trees could be harvested after 4-5 years of planting. From April to November, the total soil water storage in QDX, QDXFQD, QDF increased 29.11 mm and 21.74 mm, respectively, however, CKQ decreased 13.19 mm. In the rainy season, CKQ increased the soil water consumption in 20-40 cm soil layers, and QHB, QDXFQDF increased soil water content in 20-40 cm soil layers. Film mulching practices in balsa plantations increased soil available P and NO3-N content. From January to August 2020, soil P in QDX, QDXFQD, QDF increased 5.54 mg kg−1 and 10.72 mg kg−1. From January to August in 2020, soil nitrate nitrogen content under QDXFQDF treatment increased by 126.32 mg kg−1. Cultivation of soybean with plastic film under light wood forest could significantly increase soil available phosphorus and nitrate nitrogen content, increase soil water storage and promote the sustainable growth of light wood..
Research Reports
Effect of Light Quality on Morphological and Physiological Indexes of Dendrobium denneanum
DENG Jie, WANG Gang, YAO Chen, XING Qiyao, XIE Jie, HUANG Zirong, PU Shangrao, FAN Yijun, LUO Aoxue
2022, 43(1): 19-23. doi: 10.12172/202103300001
Abstract:
In order to find a new method to improve the ornamental value and economic value of Dendrobium denneanum, Dendrobium denneanum was used as the experimental material to study the effect of light quality on its morphological and physiological indexes. Red and blue light was used in the experiment. The treatment groups were T1 group (red: blue = 3∶1), T2 group (red: blue = 1∶1), T3 group (red: blue = 1∶3), and the control group was white light. All the treatments were irradiated for 2 hours every day, and samples were taken for detection at 7, 14, 21 and 28 days. The results showed out: (1) T1 light quality (red light: blue light = 3∶1) could effectively increase the stem length of Dendrobium denneanum after 7 days of irradiation, and could promote the stem diameter after 21 days of irradiation; (2) T2 light quality (red light: blue light = 1∶1) could promote the stem length after 7 days of irradiation; (3) T3 light quality (red light: blue light = 1∶3) could effectively prolong the flowering period of Dendrobium denneanum, and could effectively increase the content of chlorophyll a and b at day 7th, while could effectively increase the content of soluble protein at day 21. The results indicated that different ratios of red and blue light irradiation could effectively regulate the flowering period and growth of Dendrobium denneanum and increase its ornamental value.
Research Reports
Comparative Study and Early Appraisal and Preliminary Selection on Genetic Basis of Higher Generations Breeding Population of Chinese Fir and One-generation Population
BAO Xiaomei, HUA Chaohui, YEI Jingjun, WANG Hailong, QI Ming, HE Guiping
2022, 43(1): 24-30. doi: 10.12172/202104080001
Abstract:
The first open pollination test plantation of Chinese fir was selected as the reference, and the genetic variability of growth traits of the parents open pollination test plantation in the third-generation primary seed orchards of Chinese fir was studied to understand whether the genetic basis of the third-generation breeding population had been narrowed, so as to provide a scientific basis for genetic improvement of higher generation. Based on the results of the third-generation experiment, certain better families of Chinese fir third-generation were selected in the backward selection, and the individual heritability of forward selection was estimated, so as to prepare for the fourth-generation improvement of Chinese fir. The results demonstrated as follows: (1) Compared with the first-generation breeding population, the genetic basis of tree height traits in the third-generation breeding plant was not narrowed after multi-generation breeding selection, and the high-generation breeding has a promising prospect; (2) The seedling height traits of the third-generation test forest of Chinese fir in Suichang had higher genetic variability, and the heritability of family was above 0.8, and the individual heritability was above 0.3. The variability of seedling height was relatively moderation: GCV about 10%. (3) There were 18 families with annual seedling height exceeding the population average in Dongzhang site of Suichang, and there were two families with annual seedling height exceeding times half of the standard deviation (68.1939 cm) of the population: B105-3 and B42-3; (4) In Zhenggangling site, there were 13 families in which the biennial seedling height was higher than the population on average, and there were two families in which the two-year seedling height was more than times half of the standard deviation (2.9049 m) of the population: the mixed Long second-generation, B03-3; (5) The survival rate of Chinese fir plants in the two sites was relatively higher, which indicated that Chinese fir in the experiment had better adaptability to the experimental environment. Among them, there were two families with the highest survival rate in Dongzhang site: B109-3 and B13-3 respectively. Six families were included in the families with the highest survival rate in the site of Zhenggangling: the mixed Long second-generation, a09-3, biclonal-1339, a76-3, b145-3, and b03-3.
Research Reports
Response of Frankia and Casuarina cunninghamiana Symbiotic System to Soil Pb Pollution
ZHAO Jiayi, XIONG Maocen, WANG Xin, ZHONG Moyu, WANG Ting, PAN Yuanzhi
2022, 43(1): 31-36. doi: 10.12172/202105140002
Abstract:
In order to explore the response of Frankia bacteria and Casuarina cunninghamiana symbiont to soil Pb pollution in soil, pot experiments were conducted to study the effects of Frankia wet bacteria 0 (CK), 10, 20 mg·plant−1 on nodulation amount, contents of Pb, K, CA, Mg, Cu, Mn in the aboveground parts, stress physiology and root activity of Casuarina cunninghamiana under certain Pb treatment. The results of the pre-experiment showed that Casuarina cunninghamiana was stressed but not lethal under 600 mg·kg−1 lead (PB), so the Pb concentration was set at 600 mg·kg−1 in the formal experiment. The results showed that the application of 20 mg·plant−1 Frankia wet mycelium could significantly increase the nodulation rate of Casuarina cunninghamiana. The nodulation rate of Casuarina cunninghamiana was 100% when inoculated with 10 mg·plant−1 or 20 mg·plant−1 Frankia wet mycelium. Compared with CK, the Pb content in aerial parts of Casuarina cunninghamiana decreased significantly with the application of Frankia wet mycelium 10 and 20 mg·plant−1. When the inoculation amount was 10 mg·plant−1, the K content in aerial parts of Casuarina cunninghamiana decreased significantly, while the Cu content increased significantly. The change of Ca, Mg and Mn was not significant (P < 0.05). The free proline and soluble sugar in Casuarina cunninghamiana decreased by 56.04% and 10.10% respectively, and the TTC reduction intensity of root activity increased by 87.12% when Frankia inoculation was 20 mg·plant−1. In conclusion, under the same Pb stress, high inoculation amount (20 mg·plant−1) of Frankia bacteria could enhance the resistance of Casuarina cunninghamiana to Pb pollution in soil.
Research Reports
Study on Immediate Recovery Ability and Driving Factors of Nematode-trapping Fungi in Forest Soil After Fire Disturbance
QI Yukun, ZHANG Xin, DENG Wei, HUANG Shuaiyi, SHE Rong, YANG Xiaoyan
2022, 43(1): 37-43. doi: 10.12172/202106140001
Abstract:
Fire is a common disturbance for forest ecosystem, and soil microorganisms are an important part of forest ecosystem. The restoration of soil microorganisms after fire disturbance directly impacts the restoration of the whole aboveground ecosystem. However, the research about immediate recovery ability of soil microorganism after fire and the dynamic changes of microbial community in different soil layers are still lacking. In order to analyze the immediate recovery ability and dynamic changes of soil nematode-trapping fungi community after fire in different soil layers, the Pinus yunnanensis forest which was burned 40 days ago were selected as the study area, and the adjacent unburned area as the control. Soil samples were collected from different layers (0~10 cm, 10~20 cm, 20~30 cm). The nematode-trapping fungi were isolated by traditional cultural method, and the strains were identified by morphological and molecular techniques. The immediate recovery ability of nematode-trapping fungi community after fire and the role of nematode-trapping fungi in community recovery in different soil layers were analyzed. The results showed that: (1) The biomass of nematode-trapping fungi recovered rapidly after 40 days of fire disturbance, but the community diversity decreased significantly; (2) Genus Dactylellina might be the key group for nematode-trapping fungi recovery after fire disturbance; (3) Nematode-trapping fungi distributed in the subsoil may be the key biological factor driving the rapid recovery of soil nematode-trapping fungi community, which played an important role in the restoration of soil microbial community after fire.
Research Reports
Response of Vegetation to Extreme Temperature in the Three Gorges Reservoir Area
ZHANG Chunye, CHEN Guojian, HE Qian, SUN Chengbin, HE Shuanghong
2022, 43(1): 44-49. doi: 10.12172/202108040001
Abstract:
Based on the daily meteorological data of the highest temperature, lowest temperature, average temperature data from 22 meteorological stations, normalized vegetation index data (NDVI) and vegetation type data in the Three Gorges reservoir area from 2000 to 2019, this paper analyzed the asymmetric change of extreme temperature during day and night in the Three Gorges reservoir area, and its dynamic effects on vegetation using the RClimDex extreme weather index model, trend analysis and Pearson's correlation analysis method.. The results showed that: (1) Over the past 20 years, the change range of extreme temperature index at night was greater than that during the day in the Three Gorges reservoir area; (2) The response of vegetation to the extreme temperature index at night was more pronounced than that during the day; (3) Different vegetation types had different correlations with the extreme temperature during the day and night. Two cold indexes, TX10p and TN10p, played obstructive roles on vegetation growth, especially on coniferous forest and grass. TX90p and TN90p had positive effects on the growth of all vegetation types, and TN90p had more positive effects, especially on broad-leaved forests, cultivated plants, and grasses.
Ecological Development
Analysis of NDVI Vegetation Cover Change Characteristics in Desertification Monitoring Areas of Zoige County Based on Landsat 8
LIU Shuo, YANG Jianyong, CAI Fanlong
2022, 43(1): 50-56. doi: 10.12172/202104200001
Abstract:
In this paper, the fifth desertification monitoring area in Zoige county was selected as the research area, and the NDVI was extracted from Landsat 8 images in early October of 2013, 2015 and 2017. The vegetation coverage (FC) was inversed by the dimidiate pixel model. After classifying the NDVI and FC, the area transfer matrix of each level was analyzed, and the correlation analysis between NDVI , FC and the desertification degree was also analyzed. The results showed that: (1) The NDVI and FC showed a significant increasing trend from 2013, 2015 and 2017, with the median value of NDVI increasing from 0.4775 in 2013 to 0.5374 in 2015 and reaching 0.5921 in 2017; the median value of FC increased from 0.5305 in 2013 to 0.5971 in 2015 and reached 0.6578 in 2017. (2) In the area transfer matrix of NDVI and FC levels, the specific transformation direction was the same, mainly to the direction of higher vegetation, which was shown as: the medium level to the higher level; the lower grade to the medium grade; the low level to the lower level. (3) The NDVI and FC levels were significantly positively correlated with the desertification degree monitored in 2015, indicating that the classification of NDVI and vegetation coverage reclassification grades was basically in line with the current situation of desertification vegetation coverage in the study area. The research methods and results could provide data and technical support for desertification monitoring.
Ecological Development
Study on Correlation between Rocky Desertification Degree and Forest Water Conservation in Karst Area
LI Tingling, XIONG Kangning, YANG Shan, ZHANG Shihao, LIU Haiyan
2022, 43(1): 57-64. doi: 10.12172/202106040001
Abstract:
In order to investigate the water conservation capacity of different types of forest in karst rocky desertification areas, the water-holding capacity of litter layer and soil layer of different forests was measured in nine types of forest in Bijie-Salaxi potential-mild rocky desertification research area, Guanling-Zhenfeng Huajiang medium-intensity rocky desertification research area and Shibingwu potential rocky desertification research areas in southern China. The results showed that: (1) The order of effective retention capacity of litter layer in the medium-intensity rocky desertification study area was: Tectona grandis > Cladrastis platycarpa > Zanthoxylum bungeanum, in the potential-mild rocky desertification study area was: Pinus armandii > Betula luminifera > Juglans regia, in the non-potential rocky desertification study area was: Pyrus > Tilia nanchuanensis > Pinus massoniana. (2) Soil bulk density of different forest types varied from 0.85 g·cm−3 to 1.34 g·cm−3, and total porosity varied from 47.71% to 65.69%. Soil bulk density was negatively correlated with soil porosity, water holding capacity and water storage (p < 0.05), while soil water content was positively correlated with soil porosity (p < 0.05). (3) The comprehensive water-holding capacity of different forest types was calculated by Topsis method. The results showed that in medium-intensity rocky desertification study area: Tectona grandis > Cladrastis platycarpa > Zanthoxylum bungeanum, in potential-mild rocky desertification study area: Pinus armandii > Betula luminifera >Juglans regia, and in non-potential rocky desertification study area: Pinus massoniana > Pyrus > Tilia nanchuanensis. The results could provide a basis for subsequent rocky desertification management and vegetation restoration.
Ecological Development
Effects of National Highway 318 on the Biodiversity of Non-volant Small Mammals on Both Sides of the Road in Gexigou Nature Reserve
WANG Xuming, FAN Ronghui, Pucuo wangjia, REN Xiaoqin, LIU Yingxun, QING Jiao, WANG Xin
2022, 43(1): 65-69. doi: 10.12172/202106080001
Abstract:
In order to study the effects of National Highway 318 on the biodiversity in Gexigou National Nature Reserve, the non-volant small mammals was selected as the research object. 54 sampling plots of 9 altitude zones were set up at altitude interval of 200 m and distances of 0-100 m, 100-200 m and 200-300 m from the highway on both sides of National Highway 318. The species composition of non-volant small mammals was investigated, and the diversity and evenness indexes were calculated. The results showed that there were 18 species, 5 families and 3 orders on both sides of the 318 National Highway in the nature reserve, of which 14 species were found in 0-100 m section, and the capture rate was 4.49%. 17 species of small mammals were found in 100-200 m section, and the capture rate was 6.11%. There were 12 species in 200-300 m section, and the capture rate was 4.95%. The biodiversity index was the highest in 100-200 m section, the lowest in 200-300 m section and the middle in 0-100 m section, which indicated that National Highway 318 had little effect on non-volant small mammals in Gexigou Nature Reserve.
Ecological Development
Study on Hierarchical Clustering of Forest Fire Risk Sensitivity in Xichang City
Yi laiazhi, TANG Yong, HE Li, YU Xue
2022, 43(1): 70-76. doi: 10.12172/202105220001
Abstract:
The forest fire in Xichang in 2020 provides a good opportunity for the study of fire risk sensitivity clustering. In order to reveal the differences of fire risk perception among different forest fire risk sensitivity cluster groups and different tourism behaviors driven by fire danger, the foreign tourists travelling Xichang were selected as the research object, through the questionnaire survey. The results showed that, based on the fire risk sensitivity, the tourists were divided into three effective clusters: fearless (n = 73), cautious (n = 133) and rational (n = 43), and the correct grouping rate was over 80%. There were significant differences in the perceived threat of wildfires in Lushan Forest Park, Torch Festival, and Yi Nationality Year among different clusters, and the intensity of fire risk perception was cautious > rational > fearless. When a fire emergency occurred, most of the fearless, cautious and rational clusters would choose to postpone the trip, especially the cautious cluster with the highest number and proportion, which indicated that tourists with higher risk sensitivity tended to avoid risks. The conclusion of this paper was expected to provide reference for people with different risk sensitivity to formulate differentiated and targeted coping strategies.
Ecological Development
Cultivation Experiment of Phyllostachys nidularia Munro in Wolong Nature Reserve in Rainy Season
WANG Xiaohong
2022, 43(1): 77-81. doi: 10.12172/202104270001
Abstract:
Phyllostachys nidularia Munro is the favorite food for giant pandas and is often used as the feeding bamboo for captive giant pandas. From May 2018 to September 2018, in order to explore effective cultivation technique for bamboo base building, the cultivation experiment of Phyllostachys nidularia Munro in rainy season was conducted in Shenshuping base, Gengda town, Wolong Nature Reserve. The experiment completed the transplanting of Phyllostachys nidularia Munro and conducted six growth data survey and obtained some useful data. The results showed that recovering, shooting and survival rate of this test were all better than ordinary planting method, especially the three leaving branches and use of specific compound bamboo fertilizer contributed to higher survival rate and shooting emergence rate, but the number of leaving branches had no obvious effect on shortening the recovering length.
Forestry Industry
Habitat Suitability Evaluation and Regionalization of Juglans cathayensis Dode in Sichuan Province Based on MaxEnt Model
WU Ming, LI Feng, WANG Rulin, ZHAO Jinpeng
2022, 43(1): 82-86. doi: 10.12172/202104150002
Abstract:
In order to clarify the habitat suitability of Juglans cathayensis Dode in Sichuan province, the MaxEnt model was used to predict its potential distribution area by combining the distribution information and environmental variables. The effects of major environmental variables on the distribution were analyzed, and the accuracy of the prediction model was evaluated using ROC (receiver operating characteristic curve) curve. The results were as follows: (1) The average AUC of the training set was 0.990 after more repetitions, which indicated that the prediction effect of the model was good. (2) Based on the Jackkinfe method and the Person's correlation coefficient method, the most important environmental variables affecting the potential distribution of J.cathayensis Dode were annual mean temperature, preciptitation of warmest season, mean temperature of driest season and mean temperature of coldest season. Altitude had little effect on the potential distribution of wild walnut, and 300~3800m was suitable for the growth of wild walnut. (3) According to the MaxEnt model, the suitable range of average annual temperature was 9.68~18.88 ℃, and mean diurnal range [Mean of monthly(max temp - min temp)] is 6.16~11.63℃, and Isothermality [(Mean diurnal range / Temperature annual range)×100] was 24.68~44.47, and temperature seasonality (standard deviation×100) was 313.04~933.33. The lowest temperature of the coldest month was −7.38~4.76 ℃, and mean temperature of wettest season was 16.52~25.35 ℃, and mean temperature of driest season was −0.9~12.4 ℃, and average temperature of the coldest season was −1.19~10.71 ℃. The annual precipitation was 654.55~5033.77 mm, and the monthly precipitation in the wettest month was 116.94~948.49 mm. The precipitation in the wettest season was 311.69~2158.44 mm, and the precipitation in the warmest season was more than 358.44 mm.
Forestry Industry
Study on the Selection of Light Substrate of Machilus thunbergii Based on Orthogonal Design
LIU Haibing, CHEN Bin
2022, 43(1): 87-91. doi: 10.12172/202104170001
Abstract:
The orthogonal experiment was carried out with four materials of peat, perlite, rice husk, and compost as the matrix component. The height relative growth, diameter growth, height/diameter ratio, dry weight per plant of Machilus thunbergii were determined under different treatments. The results showed that formula P6 (peat: perlite: rice husk: compost=1:0.4:0.2:0.3) had the best growth effect, and the formula (peat: perlite: rice Shell: compost=0.7:0.4:0.2:0.2) selected by extreme value analysis and cost accounting was the most suitable for cultivating Machilus thunbergii seedlings.
Forestry Industry
Analysis on Oil Yield of Cinnamomum longepaniculatum Leaves in Different Growth Stages
NING Dengwen, LIAN Dongming, ZHOU Xin, ZHENG Renhong, ZHOU Chengqiang
2022, 43(1): 92-96. doi: 10.12172/202104280001
Abstract:
The effects of leaf picking time, leaf picking type, tree age and fresh and dry leaves on oil yield were investigated in this study. The results showed that: (1) When mixed leaves of different ages were collected, the oil yield of Cinnamomum longepaniculatum aged 21-40 years was higher than that of trees aged less than 20 years and more than 41 years, and the highest oil yield occurred in April, August and December. (2) When young leaves of the same age are collected, the oil yield of spring shoots in March was the lowest, only 0.5%. (3) The difference of oil yield between fresh leaves and natural air-dried leaves of Cinnamomum longepaniculatum was small, which was 0.11%. The results indicated that the oil yield of Cinnamomum longepaniculatum leaves was related to the degree of lignification. The higher the degree of lignification, the higher the oil yield. After lignification, the oil yield was stable and the loss was small. In the production process, it is recommended that it is better to harvest Cinnamomum longepaniculatum leaves when Cinnamomum longepaniculatum is fully lignified.
Forestry Industry
Study on Cutting Propagation Techniques of Liriodendron sino-americanum
GUAN Lanhua, JIANG Xiang’e, CAI Heng, XU Hongmei, WANG Jan, CHEN Honglin, WU Yinbo, YANG Han, CAO Jian
2022, 43(1): 97-101. doi: 10.12172/202106070002
Abstract:
The excellent varieties of Liriodendron sino-americanum were selected as the study object, the cuttings of the current year in the cutting orchard were used as the cuttage, and the effects of cutting season, substrate and plant growth regulators on rooting of Liriodendron sino-americanum were studied. The results showed that: (1) The rooting rate of cuttage varied significantly in different seasons, with the highest rooting rate being 57.3% in summer, followed by autumn (40.3%) and spring (24.7%). (2) There were significant differences in rooting rates among different cutting media. The rooting rate of perlite+vermiculite+river sand (1∶1∶1) was the highest (65.1%), followed by vermiculite+river sand (1∶1) (59.6%), perlite+river sand (1∶1) (52.3%), river sand (51.9%), peat soil (40.3%) and loess (33.5%). (3) Five kinds of plant growth regulators, such as ABT1, GGR7, 911, NAA and IBA, had very significant effects on cutting rooting rate. Based on the overall effect of plant growth regulators, ABT1 > NAA>GGR7 > IBA>911, and the effect of treatment time was 1h>3h>10s>6 h. The highest rooting rate was 88.8% when treated with ABT1 1000 mg·L−1 for 1 h.
Review and Monograph
Knowledge Map Analysis of Research Literatures on Urban Ecosystem Services Based on CiteSpace
DAI Fuqiang, LI Qing, ZHANG Xia, LIU Hao
2022, 43(1): 102-108. doi: 10.12172/202104040001
Abstract:
Urban ecosystem service is the research hotspot of ecological economics and environmental economics. Based on the literature records of urban ecosystem services research in CNKI from 1999 to 2019, the research hotspots and trends on urban ecosystem services in China were explored by using knowledge map analysis and bibliometric method. The results showed that: (1) The domestic research showed a continuous growth trend, which could be divided into three stages: preliminary exploration, steady growth, and rapid growth. (2) The research hotspots had gradually shifted from urban ecosystem service functions and value assessment to urban ecological planning and ecological restoration research based on ecosystem services. (3) Further research hotspots include: spatial evaluation and mapping of urban ecosystem services, evaluation index and methods of urban ecosystem service value, trade-off and coordination of urban system services, relationship between urban system services and well-being of urban residents, and application of urban system services in urban planning and design.
Review and Monograph
Study on Seed Germination Characteristics of Endangered Tree Species Ormosia saxatilis in Guizhou Province
JIANG Shunbang, DING Zhangchao, CHENG Tongxuan, YUAN Congjun, ZHOU Wenjuan
2022, 43(1): 109-114. doi: 10.12172/202010100001
Abstract:
In order to explore the germination characteristics of Ormosia saxatilis seeds and limiting factors affecting seed germination, the physical properties and water absorption of Ormosia saxatilis seeds were measured, and two combinations of seed coat pretreatment and germination temperature treatment were carried out, and the methanol extracts of seed coat and embryo were measured by bioassay. The results showed that the seeds of Ormosia saxatilis were dormant, and the seed coat was hard and compact, less permeable breathability. Scratching the Ormosia saxatilis seed coat with a knife could effectively improve the permeability of the seed coat, and the cumulative water absorption rate in 96 h reached 63.63%, which was 60.56% higher than that of untreated seeds. The germination rate of peeled Ormosia saxatilis seeds was the highest, reaching 45.5%, which was 25.7% higher than that of non-peeled seeds. The germination of Ormosia saxatilis was limited by seed coat, and the combination of seed coat removal and temperature change at 25℃/20℃ had the best germination effect, with the gemination rate as high as 61.0%. The seed coat extract and embryo extract of Ormosia saxatilis could inhibit the gemination of Brassicca campestris seeds. With the increases of extract solution concentration, the germination inhibition rate gradually increased and the seed germination rate gradually decreased. The inhibitory effect of seed coat extract was significantly higher than that of embryo. Compared with the control, the germination rate of Brassicca campestris seeds treated with 0.01g·mL−1, 0.05g·mL−1 and 0.1g·mL−1 seed coat methanol extract decreased by 20.0%, 42.0% and 64.0% respectively, and the germination inhibition rate increased by 25.6%, 53.9% and 84.6% respectively. It was preliminarily considered that the reasons for seed dormancy of Ormosia saxatilis was poor seed coat permeability, and the inhibitory substances contained in seed coat and embryo.
Review and Monograph
Analysis on the Demand for the Suitability of Seniors’ Tourism and Dwelling Towns——A Case Study of Gengda Town in Western Sichuan
ZHOU Yixuan, ZHOU Yuhan, CHEN Yun, ZHU Yafu, YU Songjun, TAO Jianjun
2022, 43(1): 115-120. doi: 10.12172/202103270005
Abstract:
According to the interview, questionnaire and the analysis of related factors, the living and service environment, location characteristics and socio-economic conditions of the destination are the most concerns of the elderly tourism and residential pension seniors. There is a strong demand for the conditions of public facilities, climate suitability and infrastructure for the elderly, followed by the demand for cultural environment. Therefore, the first consideration for the construction and site selection of the tourism and dwelling town for the aged should be the place with suitable location conditions and natural environmental conditions. Combined with the demand, it is necessary to improve the hardware facilities and create an environment suitable for the aged based on the tourist market to create a higher-quality soft and hard environment for living and activities.
Review and Monograph
Discovery and Discussion of the Formation Mechanisms of Wild Double Flowers of Rhododendron moupinense
CAI Shuihua, MA Wenbao, ZHOU Xiao, XIE Hao, ZOU Wenyong, LIU Juan, YANG Qunmei, XU Lin, LI Rengui
2022, 43(1): 121-126. doi: 10.12172/202105310001
Abstract:
Double flowers of Rhododendron moupinense were found in Sanjiang Township, Wenchuan County, Sichuan Province. Compared with the non-double flowers of Rhododendron moupinense in the same habitat, there were some different characteristics: the appearance of the flower was similar to that of camellia, the stamens were numerous and without a fixed number, the lower parts of the filaments changed into petaloid structures and with white pubescent, the pistils were degenerated. According to the analysis of the formation mechanism of double flowers, it is speculated that the reasons for the formation of double flowers of Rhododendron moupinense could be the mutation or abnormal expression of genes related to the development of flower organs, among which the C class of MAD-box genes and B class of MAD-box genes may play the major role.
Review and Monograph
A New Record Species of Ericaceae (Rhododendron annae Franch.) in Sichuan Province
YU Dingxiang, YUE Hong, WANG Fei, ZHANG Chao, ZHU Dahai, JI Huijuan, MA Wenbao
2022, 43(1): 127-129. doi: 10.12172/202108170001
Abstract:
Based on specimen collecting and identification, consulting collections and electronic specimens, searching documents, etc. the resources and distribution of Rhododendron in Liangshan Prefecture, Sichuan Province were investigated, and a new recorded species of Ericaceae, Rhododendron annae Franch. were found. The species belong to the subgroup of Rhododendron irroratum (Subsect. Irrorata), whichwas similar to the other three species of the same subgroup, R. irroratum, R. aberconwayi and R. annae subsp. laxiflorum. According to the literature records, Rhododendron annae was originally distributed only in western Guizhou and northeastern Yunnan.. This new finding expanded its geographical distribution range and expanded the basis of development and utilization.
Review and Monograph
Two Newly Recorded Species of Lauraceae in Sichuan Province, China
CHEN Yan, LUO Qiang
2022, 43(1): 130-132. doi: 10.12172/202106100001
Abstract:
Two newly recorded species of Lauraceae, Machilus gongshanensis H.W.Li and Litsea honghoensis Liou, were reported in Sichuan, China. Meanwhile, the identifications and discussion were made, and the relevant photos were provided. The voucher specimen were preserved in the Herbarium room (XIAS) of Xichang College. The two newly recorded species were endemic to China. This discovery not only enriched the diversity of Lauraceae plants in Sichuan, but also had certain guiding significance in studying the origin and diffusion routes of related groups.