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The Response of vegetation biomass to Soil Properties along Degradation Gradients of Alpine Meadow at Zoige Plateau

Chinese Geographical Science 2020年第3期30卷 446-455页

作者： LIU Miao ZHANG Zhenchao SUN Jian XU Ming MA Baibing TIJJANI Sadiy Baba CHEN You-jun ZHOU Qingping Synthesis Research Centre of Chinese Ecosystem Research Network Key Laboratory of Ecosystem Network Observation and Model-lingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-environmental SciencesChinese Academy of SciencesBei-jing 100085China Department of Ecology Evolutionand Natural ResourcesSchool of Environmental and Biological SciencesRutgers UniversityNew BrunswickNew Jersey 08901USA The College of Environment and Planning of Henan University Kaifeng 475004China University of Chinese Academy of Sciences Beijing 100049China Institute of Qinghai-Tibetan Plateau Southwest Minzu UniversityChengdu 610041China

Alpine grassland of the Tibetan Plateau has undergone severe degradation, even desertification. However, several questions remain to be answered, especially the response mechanisms of vegetation biomass to soil properties. In this study, an experiment on degradation gradients was conducted in an alpine meadow at the Zoige Plateau in 2017. Both vegetation characteristics and soil properties were observed during the peak season of plant growth. The classification and regression tree model(CART) and structural equation modelling(SEM) were applied to screen the main factors that govern the vegetation dynamics and explore the interaction of these screened factors. Both aboveground biomass(AGB) and belowground biomass(BGB) experienced a remarkable decrease along the degradation gradients. All soil properties experienced significant variations along the degradation gradients at the 0.05 significance level. Soil physical and chemical properties explained 54.78% of the variation in vegetation biomass along the degradation gradients. AGB was mainly influenced by soil water content(SWC), soil bulk density(SBD), soil organic carbon(SOC), soil total nitrogen(STN), and pH. Soil available nitrogen(SAN), SOC and p H, had significant influence on BGB. Most soil properties had positive effects on AGB and BGB, while SBD and p H had a slightly negative effect on AGB and BGB. The correlations of SWC with AGB and BGB were relatively less significant than those of other soil properties. Our results highlighted that the soil properties played important roles in regulating vegetation dynamics along the degradation gradients and that SWC is not the main factor limiting plant growth in the humid Zoige region. Our results can provide guidance for the restoration and improvement of degraded alpine grasslands on the Tibetan Plateau.

关键词： vegetation biomass soil properties degradation gradients structural equation modelling Zoige Plateau

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Distribution patterns of vegetation biomass and nutrients bio-cycle in alpine tundra ecosystem on Changbai Mountains,Northeast China

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Journal of Forestry Research 2007年第4期18卷 271-278页

作者：魏晶姜萍于德永吴钢付海威中国科学院生态环境研究中心城市与区域生态国家重点实验室

A study was conducted to test the correlation between biomass and elevation and the differences in concentration and storks of nutrients among five vegetation types （Felsenmeer alpine tundra vegetation-FA, Lithic alpine tundra vegetation-LA, Typical alpine tundra vegetation-TA, Meadow alpine tundra vegetation-MA, and Swamp alpine tundra vegetation-SA） on alpine tundra of Changbai Mountains, Jilin Province, China in growing seasons of 2003, 2004 and 2005. The biomass of 43 mono-species and soil nutrients in alpine tundra ecosystem were also investigated. Dominant species from Ericaceae （such as Rhododendron chrysanthum and Vaccinium jliginosum var. alpinum） were taken to analyze organ biomass distribution. Result showed that the biomass and elevation had a significant correlation （biomass-237.3 in（Elevation）＋494.36; R^2=0.8092; P〈0.05）. No significant differences were found in phosphorus and sulphur concentrations of roots, stems and leaves among the five vegetation types. There were significant differences in nitrogen and phosphorus stocks of roots, stems and leaves and in sulphur stock of stems and leaves among TA, MA, and SA vegetation types （p〈0.05）. The nutrient stock of five vegetations was averagely 72.46 ***^-2, of which N, P, S were 48.55, 10.33 and 13.61 kg·hm^-2, respectively. Soil N and S concentrations in meadow alpine tundra soil type was significantly higher than those in other four soil types （Cold desert alpine tundra soil, Lithic alpine tundra soil, Peat alpine tundra soil, and Gray alpine tundra soil）. Phosphorous concentration in SA type was higher （p〈0.05） than in other types. Soil nutrient stock （0-20cm） was averagely 39.59 ***^-2, of which N, P, S were 23.74, 5.86, 9.99 t·hm^-2, respectively.

关键词： Nutrients bio-cycle Stock vegetation type Soil type vegetation biomass

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biomass accumulation and organic carbon stocks of Kandelia obovata mangrove vegetation under different simulated sea levels

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Acta Oceanologica Sinica 2022年第8期41卷 78-86页

作者： Jiahui Chen Min Gao Guangcheng Chen Heng Zhu Yong Ye Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems College of the Environment and EcologyXiamen UniversityXiamen 361102China Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Fujian Provincial Station for Field Observation and Research of Island and Costal Zone in Zhangzhou Xiamen 361005China

Mangrove forests are vulnerably threatened by sea level rise(SLR).vegetation organic carbon(OC)stocks are important for mangrove ecosystem carbon *** is critical to understand how SLR affects vegetation OC stocks for evaluating mangrove blue carbon budget and global climate *** this study,biomass accumulation and OC stocks of mangrove vegetation were compared among three 10 year-old Kandelia obovata(a common species in China)mangrove forests under three intertidal elevations through species-specific allometric *** study simulated mangrove forests with SLR values of 0 cm,40 cm and 80 cm,respectively,representing for the current,future~100 a and future~200 a SLR of mangrove forests along the Jiulong River Estuary,*** directly decreased mangrove individual density and inhibited the growth of mangrove *** total vegetation biomasses were(12.86±0.95)kg/m^2,(7.97±0.90)kg/m^2 and(3.89±0.63)kg/m^2 at Sites SLR 0 cm,SLR40 cm and SLR 80 cm,*** total vegetation OC stock decreased by approximately 3.85 kg/m^2(in terms of C)from Site SLR 0 cm to Site SLR 80 *** lower vegetation biomass and OC stock of various components(stem,branch,leaf and root)were found at Site SLR 80 *** increments of vegetation biomass and OC stock also decreased with SLR ***,significant lower sedimentation rate was found at Site SLR 80 *** indicated that SLR will decrease mangrove vegetation biomass and OC stock,which may reduce global blue carbon sink by mangroves,exacerbate global warming and give positive feedback to SLR.

关键词： sea level rise vegetation biomass organic carbon stock component mangrove forest Kandelia obovata

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Variation in species assemblages due to micro-topography and flow regime govern vegetation carbon stock in seasonal floodplain wetlands

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Ecological Processes 2019年第1期8卷 602-616页

作者： Priyanka Sarkar Tapati Das Dibyendu Adhikari Department of Ecology and Environmental Science Assam UniversitySilchar 788011India Department of Botany North-Eastern Hill UniversityShillong 793022India

Hypothesis:Variation in species assemblages due to micro-topographic features and flow regime determine vegetation carbon stock in floodplain *** and method:We tested this hypothesis in Chatla—a tropical floodplain wetland located in northeast *** sampling stations characterized by contrasting micro-topographic and flow parameters were selected in the wetland for *** composition,assemblage pattern,and vegetation carbon stock were studied in these stations during three flood phases,i.e.,early,middle,and late flood phases following standard *** and multivariate statistics were used to determine the relationship between the selected environmental parameters,plant species assemblages,and vegetation carbon stock of the ***:Thirty-one species of herbs and five species of shrubs were recorded from the five stations in Chatla floodplain *** regime characterized by water flow velocity and discharge showed substantial variations across the *** parameters in turn are related to variations in the micro-topographic characteristics namely depth,width,and cross-sectional area of the *** species composition and abundance differed significantly with respect to micro-topography and flow regime as revealed by the cluster *** canonical correspondence analysis revealed strong association of plant species assemblages with the micro-topography and flow regime within the *** regression analysis revealed a significant positive relationship of the vegetation carbon stock with the water ***:Spatial variation in plant species diversity because of micro-topography and flow regime determines the vegetation carbon stock in floodplain *** of these parameters by anthropogenic activities such as mining and quarrying may potentially influence the carbon stocking potential of seasonal floodplain ***,appropriate measures should be taken to main

关键词： Riparian vegetation Tropical wetland vegetation biomass Ecosystem services Northeast India

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