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Deepened snow promotes temporal stability of semi-arid grasslands via improving water acquisition-and-use strategies

文献类型： 外文期刊

作者： Li, Ping 1 ; Jia, Zhou 1 ; Wu, Yuntao 1 ; Chang, Pengfei 1 ; Jalaid, Nairsag 1 ; Guo, Lulu 1 ; Pan, Shengnan 1 ; Wang, Shaopeng 5 ; Jiang, Lin 6 ; Hu, Shuijin 7 ; Liu, Lingli 1 ;

作者机构： 1.Chinese Acad Sci, Key Lab Vegetat & Environm Change, Inst Bot, Beijing, Peoples R China

2.China Natl Bot Garden, Beijing, Peoples R China

3.Univ Chinese Acad Sci, Beijing, Peoples R China

4.Hebei Acad Agr & Forestry Sci, Inst Agr Resources & Environm, Shijiazhuang, Peoples R China

5.Peking Univ, Coll Urban & Environm Sci, Key Lab Earth Surface Proc, Minist Educ, Beijing, Peoples R China

6.Georgia Inst Technol, Sch Biol, Atlanta, GA USA

7.North Carolina State Univ, Dept Plant Pathol, Raleigh, NC USA

关键词： community composition; functional stability; mowing disturbance; physiological response; water use efficiency; winter snow cover

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 5 期

页码：

收录情况： SCI

摘要： Precipitation fluctuations strongly influence biomass production and its stability of terrestrial ecosystems. However, our understanding of the extent to which plant communities adjust their water-use strategies in response to non-growing season precipitation variations remains limited. Our 5-year snow manipulation experiment in a semi-arid grassland, complemented with paired stable isotope measurements of delta 18O and delta 13C for all species within the community, demonstrated that the impact of snowmelt on plant physiological activities extended into the peak growing season. Deepened snow enhanced ecosystem water use efficiency (WUE), biomass production, and its temporal stability. We further examined whether the observed increase in biomass stability was associated with the functional diversity of plant water-use strategies. Plant cellulose Delta 18Ocell analysis revealed that both community-weighted mean and functional dispersion of stomatal conductance were positively associated with biomass production and its stability. The delta 13C results further indicated that even with increased stomatal conductance, grasses were able to maintain their high intrinsic WUE by increasing photosynthesis more than transpiration. This resulted in higher biomass and greater dominance of high-WUE functional groups under deepened snow. In addition, we also found that deepened snow increased root biomass, particularly in the 0- to 5-cm and 20- to 40-cm soil layers. This increase in root biomass enhanced the uptake of snowmelt from both surface and deep soil layers, further contributing to community stability. Overall, our study demonstrates that plant communities can optimize water acquisition and utilization, thereby enhancing the stability of biomass production through coordinated changes in plant physiology, species reordering, and root distribution under altered snow regimes.

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