Grassland bud and shoot demographic responses to single and recurrent droughts vary across an aridity gradient
文献类型： 外文期刊
作者： Te, Niwu 1 ; Griffin-Nolan, Robert J. 3 ; Slette, Ingrid J. 4 ; Shi, Yuan 1 ; Song, Lin 1 ; Chen, Jiaqi 1 ; Wang, Hongqiang 6 ; Qian, Jianqiang 7 ; Yu, Qiang 8 ; Wang, Zhengwen 1 ; Lu, Xiaotao 1 ; Han, Xingguo 9 ; Klimesova, Jitka 10 ; Collins, Scott L. 12 ; Luo, Wentao 1 ;
作者机构： 1.Chinese Acad Sci, Inst Appl Ecol, Liaoning Northwest Grassland Ecosyst Natl Observa, Erguna Forest Steppe Ecotone Res Stn, Shenyang, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
3.Calif State Univ Chico, Dept Biol Sci, Chico, CA USA
4.Univ Calif Santa Barbara, Natl Ctr Ecol Anal & Synth, Santa Barbara, CA USA
5.Univ Calif Santa Barbara, Long Term Ecol Res Network Off, Santa Barbara, CA USA
6.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Hulunber Grassland Ecosyst Natl Observat & Res St, Beijing, Peoples R China
7.Henan Agr Univ, Coll Forestry, Zhengzhou, Peoples R China
8.Beijing Forestry Univ, Sch Grassland Sci, Beijing, Peoples R China
9.Hebei Univ, Inst Life Sci & Green Dev, Sch Life Sci, Baoding, Peoples R China
10.Czech Acad Sci, Inst Bot, Dept Expt & Funct Morphol, Trebon, Czech Republic
11.Charles Univ Prague, Fac Sci, Dept Bot, Prague, Czech Republic
12.Univ New Mexico, Albuquerque, NM USA
关键词： bud limitation; climate change; drought frequency; population regeneration; productivity; shoot density
期刊名称：ECOLOGY （ 影响因子：4.3； 五年影响因子：5.2 ）
ISSN： 0012-9658
年卷期： 2025 年 106 卷 2 期
页码：
收录情况： SCI
摘要： Clonal demographic traits play important roles in regulating community dynamics. Yet, it remains unclear how the responses of these clonal traits to drought might depend on previous drought exposure, and how drought responses vary among grasslands. We conducted a repeated drought experiment across four grasslands along an aridity gradient in northern China. We assessed the effects of single (precipitation reduction in 2021-2022) versus recurrent (precipitation reduction in 2015-2018 and 2021-2022) drought on bud density, shoot density, and the ratio of bud to shoot density. Drought reduced bud density at all grasslands and shoot density at most grasslands. Drought reduced the ratio of bud-to-shoot density only in the most arid grasslands. Recurrent drought had larger negative effects than a single drought on bud density and composition of bud and shoot at only one of four grasslands, and on shoot density at two of four grasslands. Our results suggest that previous drought exposure can alter the response of plant clonal demographic traits to subsequent drought in some but not all grasslands, and that responses can vary with mean climate.
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