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Global pattern and associated drivers of grassland productivity sensitivity to precipitation change

文献类型： 外文期刊

作者： Wang, Chao 1 ; Vera-Velez, Roy 2 ; Lamb, Eric G. 2 ; Wu, Juying 1 ; Ren, Fei 3 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci BAAFS, Inst Grassland Flowers & Ecol, 9 Shuguang Garden Middle Rd, Beijing 100097, Peoples R China

2.Univ Saskatchewan, Dept Plant Sci, Saskatoon, SK S7N 5A8, Canada

3.Qinghai Univ, State Key Lab Plateau Ecol & Agr, Xining 810016, Qinghai, Peoples R China

关键词： Net primary productivity; Experimental duration; Grasslands; Precipitation change; Plant allocation

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 806 卷

页码：

收录情况： SCI

摘要： Precipitation is a primary climatic determinant of grassland productivity, with many global change experiments manipulating precipitation. Here we examine the impacts of precipitation addition and reduction treatment intensity and duration on grassland above-(ANPP) and below-(BNPP) ground net primary productivity in a largescale meta-analysis. We tested, 1) the double asymmetry model of sensitivity, specifically whether the sensitivity of productivity decreases with treatment intensity under increased precipitation and increases with treatment intensity under decreased precipitation, 2) whether the sensitivity of productivity to precipitation change decreases with treatment length, and 3) how the sensitivity of productivity changes with climate conditions. ANPP showed higher sensitivity than BNPP under increased precipitation but similar sensitivity to BNPP under decreased precipitation. The sensitivity of ANPP and BNPP decreased with increasing treatment intensity (e.g., percentage change in precipitation, Delta PPT) and leveled off in the long-term. With increased precipitation, the sensitivity of productivity decreased with increasing treatment length (e.g., experimental duration) and leveled off in the long-term, whereas the sensitivity increased with increasing treatment length under reduced precipitation. Furthermore, the sensitivity of productivity to precipitation change decreased with increasing mean annual precipitation and temperature. Finally, our meta-analysis shows that above-and belowground net primary productivity have asymmetric responses to precipitation change. Together these results highlight the complex mechanisms underlying the impacts of precipitation change, particularly the intensity and duration of such changes, on grassland productivity. (c) 2021 Elsevier B.V. All rights reserved.

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