Effects of short-term warming and precipitation reduction on community characteristics in semi-arid sandy grassland
[Objective]The aim of this study is to study the effects of short-term warming and precipitation reduction on the species diversity,functional traits,and productivity,and to reveal the response of com-munity characteristics to climate change in sandy grassland.[Methods]The authors investigated the com-bined effects of precipitation reduction(0％,20％,40％and 60％)and warming on plant community com-position,species diversity,and functional trait,as well as relationship between community characteristics and environmental factors using open-top chambers(OTCs)to investigate the characteristics in semi-aird sands grassland of Horqin.[Results](1)Short-term warming and precipitation reduction led to changes in the plant community composition,community coverage,and aboveground biomass were significantly re-duced and species dominance of sandy grassland,suchas dominant species of Artemisia scoparia,Lespede-za davurica.(2)Short-term warming reduced Margalef richness index,Simpson index,Shannon index,and Pielou index,but short-term precipitation reduction had no effect on species diversities.(3)Short-term warming increased the height and leaf dry matter content,and reduced leaf thickness,while short-term precipitation reduction increased leaf dry matter content and leaf thickness,and reduced the height,leaf area ratio of plant community.(4)Short-term warming was the main environmental factor affecting the species diversity and functional traits in sandy grassland.[Conclusion]Short-term warming and precipitation reduction change community characteristics,but the temperature is the main environmental factor affect-ing community characteristics in sandy grassland.
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NSTL
万方数据
维普
