首页|Divergent shift of normal alpine meadow exacerbated soil loss of hillslope alpine meadows based on field experiments

Divergent shift of normal alpine meadow exacerbated soil loss of hillslope alpine meadows based on field experiments

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Global climate change and overgrazing are driving shifts in the plant composition of grassland com-munities,which may profoundly affect the function of grassland ecosystems in regulating runoff and soil erosion.Here,we examined the shift effects of normal hillslope alpine meadow to shrub and severely degraded meadow states on runoff and sediment generation under natural rainfall conditions,and determined the contributions of plant and soil properties changes to soil erodibility,runoff and sediment generation by in situ rainfall experiment and monitoring on the hillslope of Qinghai-Tibetan Plateau.The results showed that normal meadow shift into severely degraded meadow state,mean weight diameter,soil saturated hydraulic conductivity,soil cohesion and soil erodibility K-factor at the topsoil decreased by 70.3％,73.1％,80.3％and-13.1％,respectively,and when normal meadows shift into shrub meadow state,they reduced by 49.1％,-1.3％,49.4％,and-8.3％,respectively.Runoff and soil loss significantly changed by-40.0％and 177.8％when normal meadow shifted into a severely degraded meadow state,while runoff and soil loss significantly changed by+65.0％and+77.8％when normal meadow shifted into a shrub meadow state.Our findings highlight that the two divergent shifts both increased soil loss compared to the normal hillslope alpine meadows.Overall,our results indicate that the divergent shifts of normal alpine meadows exacerbated soil erodibility and soil loss of hillslope alpine meadows.These results obtained here offer a novel perspective on the regulation of runoff and soil erosion in the alpine meadow ecosystem.

Alpine meadowDivergent shiftsRunoffSoil erodibilitySoil loss

Yulei Ma、Yifan Liu、Yunyun Ban、Jingxue Zhao、Zhihua Shi、Gaolin Wu

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State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,College of Soil and Water Conservation Science and Engineering(Institute of Soil and Water Conservation),Northwest A & F University,Yangling,Shaanxi,712100,China

Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resource,Yangling,Shaanxi,712100,China

Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,100101,China

State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems,and College of Ecology,Lanzhou University,Lanzhou,730000,China

College of Resources and Environment,Huazhong Agricultural University,Wuhan,430070,China

CAS Center for Excellence in Quaternary Science and Global Change,Xi'an,710061,China

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2024

10.1016/j.iswcr.2023.11.007

国际水土保持研究(英文)

国际水土保持研究(英文)

ISSN：2095-6339
年,卷(期)：2024.(3)