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Variation in plant diversity and dominance across dune fixation stages in the Chinese steppe zone

Journal of Plant Ecology 2012年第3期5卷 313-319页

作者： Jianjiang Qiao Weiwei Zhao Xiufang Xie Guofang Liu Xuehua Ye Yu Chu Hui He Ming Dong State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China Graduate University of Chinese Academy of Sciences YuquanluBeijing 100049China Kangbashi New District Bureau of Parks and Woods Ordos 017000China Inner Mongolia Research Center for Prataculture Chinese Academy of SciencesBeijing 100093China

Aims Our aim was to study how diversity and dominance of plant species and plant functional types(pfts)change and covary across three dune fixation stages in the Chinese steppe *** In the Chinese steppe zone,we measured coverage,mean height and density of each plant species in three types of dunes(mobile,semi-fixed and fixed dunes)in four sites(Mu Us,Otindag,Hulunbeir and Horqin).Plant species were grouped into 24 pfts according to their lifespan,photosynthetic pathway,reproductive mode and life *** of each plant species and pft were determined,and species diversity and pft diversity were quantified using Shannon–Wiener *** Findings pft diversity was positively related to plant species diversity in each dune stage,but pft diversity increased more with increasing plant species diversity in the mobile and semi-fixed dunes than in the fixed *** fixation stage explained 87.2%of the variation in plant species diversity and 84.8%of the variation in pft *** species and pfts differed among the three dune fixation stages;the more fixed the dunes were,the more perennial,shrubby,clonal and C3 species ***,in mobile dunes annual C4 non-clonal herbs were the most dominant,and in semi-fixed and fixed dunes perennial C3 clonal shrubs were most dominant.

关键词： pft diversity semi-arid area vegetation covariation species replacement

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