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Vegetation classification at the association level under the China Vegetation Classification System: an example of six stipa steppe formations in China

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Journal of Plant Ecology 2019年第6期12卷 1009-1024页

作者： Changcheng Liu Thomas RWentworth Xianguo Qiao Ke Guo Dongjie Hou State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China Department of Plant and Microbial Biology North Carolina State UniversityBox 7612RaleighNC 27695-7612USA University of Chinese Academy of Sciences Beijing 100049China

Aims The latest China Vegetation Classification System(China-VCS)for natural/semi-natural vegetation has eight hierarchical levels:Association 详细信息

Aims The latest China Vegetation Classification System(China-VCS)for natural/semi-natural vegetation has eight hierarchical levels:Associationstipa steppe formations and divided them into those with cover data(299 plots)and/or biomass data(283 plots).We applied a combination of hierarchical clustering and ordination to partition the cover and biomass data sets into formations and constituent *** then used supervised noise clustering to improve the classification and to identify the core plots representing each *** species were also identified at both association and formation ***,we compared the classification results based on cover and biomass data sets and combined these results into a comprehensive classification framework for the six *** Findings Our results using cover data were comparable with those using biomass data at both formation and association *** stipa formations were classified into associations based on cover data,two based on biomass data and one based on both biomass and cover ***-seven associations were defined and proposed within the six formations,using cover or biomass data as consistent classification sections(CCSs).Both dominant species in the dominant stratum and diagnostic

关键词： association China Vegetation Classification System consistent classification section cluster analysis ordination stipa steppe

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stipa steppes in scantily explored regions of the tibetan Plateau:classification,community characteristics and climatic distribution patterns

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Journal of Plant Ecology 2018年第4期11卷 585-594页

作者： Haiwei Zhao Ke Guo Yao Yang Changcheng Liu Liqing Zhao Xianguo Qiao Dongjie Hou Chenguang Gao State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesNo.20 NanxincunXiangshanBeijing 100093China College of Life Sciences University of Chinese Academy of SciencesNo.19A Yuquan RoadBeijing 100049China School of Life Sciences Inner Mongolia UniversityNo.235 Daxuexi RoadHohhotInner Mongolia 010021China

Aims As a unique geographical unit of the earth,the tibetan Plateau is extensively covered by various stipa ***,their vegetation features have not been reported systematically till now,especially in some scantily explored *** this study,we endeavor to reveal the community types,quantitative charac-teristics and climatic distribution patterns of stipa steppes in these areas based on primary relevés obtained from *** We collected a total of 223 plots in 79 study sites in the Changthang Plateau and the Yarlung Zangbo Valley,ranging from 79°E to 91°*** categories of stipa formations were identified according to the classification scheme in Vegetation of China and then verified by Nonmetric Multidimensional *** performed detrended correspondence analysis and detrended canonical correspondence analysis to hunt for the alteration of stipa communities along the precipitation *** characteristics including species richness,coverage,biomass as well as importance values(IV)of dominant species were calcu-lated and visualized,*** Findings stipa steppes in scantily explored regions of the tibetan Plateau are classified into 11 formations but major formations are rather limited in ***(form.)stipa purpurea is the most widespread stipa assemblages not only in scantily explored regions but also across the whole tibetan *** characteristics of stipa com-munities,including coverage,species richness,productivity and IV of dominant species,demonstrate the features of typical alpine steppes on the tibetan *** proves to be the prime climatic factor controlling the distribution patterns of stipa *** subsessiliflora *** and *** glareosa normally distribute in arid habitats,but rainfall for the former is of greater *** roborowskyi and *** capillacea favor moderately moist *** purpurea and ***

关键词： stipa steppe community characteristic distribution pattern alpine steppe the tibetan Plateau

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