Quantifying the Impacts of Precipitation, Vegetation, and Soil Properties on Soil Moisture Dynamics in Desert Steppe Herbaceous Communities Under Extreme Drought
文献类型： 外文期刊
第一作者： Zhang, Yifei
作者： Zhang, Yifei;Lv, Hao;Fan, Wenshuai;Zhang, Yi;Song, Naiping;Wang, Xing;Zhang, Yifei;Lv, Hao;Fan, Wenshuai;Zhang, Yi;Song, Naiping;Wang, Xing;Zhang, Yifei;Lv, Hao;Fan, Wenshuai;Zhang, Yi;Song, Naiping;Wang, Xing;Song, Naiping;Wu, Xudong;Zhang, Huwei;Tao, Qingrui;Wang, Xiao
作者机构：
关键词： extreme drought; soil moisture; typical plant communities; desert steppe
期刊名称：WATER （ 影响因子：3.0； 五年影响因子：3.3 ）
ISSN：
年卷期： 2024 年 16 卷 23 期
页码：
收录情况： SCI
摘要： The security of water resources in the desert steppe ecosystem faces threats due to large-scale vegetation restoration. Dynamic changes in soil moisture result from the interplay of precipitation replenishment and evapotranspiration depletion, both directly regulated by vegetation and soil. To achieve sustainable vegetation restoration, understanding the quantifiable impacts of precipitation, evapotranspiration, soil, and vegetation on spatiotemporal soil moisture dynamics is crucial. However, these effects remain insufficiently understood. In this study, against the background of an extreme drought from 2020 to 2022, four typical herbaceous plant communities-Agropyron mongolicum, Sophora alopecuroides, Stipa breviflora, and Achnatherum splendens-were selected for investigation in Yanchi County, Ningxia Province, Northwest China. We analyzed dynamic changes in soil moisture at 0-120 cm during depletion, recovery, and stability periods, quantifying the relative contributions of precipitation, evapotranspiration, soil clay/sand ratio (C/S), and biomass to soil moisture dynamics. The results showed that the 0-120 cm soil moisture of the four plant communities in the depletion, recovery, and stability periods decreased from 7.38% to 6.81%, 11.22% to 8.08%, and 11.70% to 5.84%, respectively. In terms of relative importance, precipitation and evapotranspiration accounted for 25% to 50% and 23.6% to 39.6% of the total explanation for the soil moisture in each plant community, respectively. C/S primarily influenced soil moisture in the S. alopecuroides community, demonstrating a significant positive correlation with soil moisture and accounting for 49.1% of the total explanation. Biomass mainly affected soil moisture in the A. mongolicum, S. breviflora, and A. splendens communities and had a significant negative correlation with soil moisture, accounting for 5.7%, 13.1%, and 9.8% of the total interpretation, respectively. The continuous extreme drought caused the soil moisture deficit to extend from the shallow to the deep layers. The effects of C/S and biomass on soil moisture occurred in leguminous and gramineous communities, respectively.
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