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Resistance of steppe communities to extreme drought in northeast China

文献类型： 外文期刊

作者： Ma, Wang 1 ; Liang, Xiaosa 1 ; Wang, Zhengwen 1 ; Luo, Wentao 1 ; Yu, Qiang 3 ; Han, Xingguo 4 ;

作者机构： 1.Chinese Acad Sci, Inst Appl Ecol, Erguna Forest Steppe Ecotone Res Stn, Shenyang 110016, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China

关键词： Climate change; Temperate steppe; Plant functional traits; Aboveground and belowground net primary productivity; Vertical root distribution

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期：

页码：

收录情况： SCI

摘要： Background and Aims Declaring the drought-resistance of plant communities in grassland and the underlying mechanisms is crucial under climatic change scenario. Here we aimed to quantify aboveground & belowground net primary productivity (ANPP & BNPP) and their allocation in response to extreme droughts, and to uncover any underlying factors of drought resistance. Methods We experimentally reduced growing season rainfall by 66% for four years in two grassland sites (Sandy and Loamy site respectively), and measured ANPP and BNPP yearly and evaluated the relatedness of drought-induced changes for them to plant traits (Plant height, delta C-13, SLA and LNC) and community composition. Results Experimental drought decreased species richness, ANPP of forbs and the total at both sites, but decreased ANPP of grasses only at the Sandy site. Experimental drought has non-significant effect on total BNPP at both sites, but increased 10-20 cm BNPP and decreased 0-10 cm BNPP. BNPP ratio was kept unchanged at the Loamy site but increased at the Sandy site. Moreover, the communities at the Loamy site showed lower delta C-13, SLA and LNC, but greater height. Conclusions Our study demonstrates that extreme drought can impact community productivity and structure, and highlights the importance of plant traits, community composition and soil properties in modulating the responses and resistance of steppe communities to extreme drought.

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