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[1]TONG Shengchun,LI Guorong,LI Jinfang,et al.Effects of Soil Crust on Basic Characteristics and Water Erosion of Zokor Mound Soil in Alpine Meadow[J].Research of Soil and Water Conservation,2023,30(05):76-84.[doi:10.13869/j.cnki.rswc.2023.05.046.]

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Effects of Soil Crust on Basic Characteristics and Water Erosion of Zokor Mound Soil in Alpine Meadow

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 05 Page number: 76-84 Column: Public date: 2023-08-10

Title:: Effects of Soil Crust on Basic Characteristics and Water Erosion of Zokor Mound Soil in Alpine Meadow

Author(s):: TONG Shengchun¹, LI Guorong^1,2, LI Jinfang¹, ZHAI Hui¹, Li Xilai³, LIU Yabin^1,2, ZHU Haili^1,2, ZHAO Jianyun¹, CHEN Wenting¹, HU Xiasong^1,2; (1.Department of Geological Engineering, Qinghai University, Xining 810016, China; 2.Key Lab of Cenozoic Resource & Environment in North Margin of the Tibetan Plateau, Xining 810016, China; 3.College of Agriculture and animal Husbandry, Qinghai University, Xining 810016, China)

Keywords:: alpine meadow; rodent degradation area; soil crusts; basic soil characteristics; water erosion

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.05.046.

Abstract:: [Objective] The aims are to clarify the effect of soil crust on the basic characteristics and water erosion of alpine meadow mound soil, and to provide a theoretical basis for the evaluation of water erosion characteristics and the restoration and protection of local ecological vegetation in the future. [Methods] The physical crusts, lichen crusts and moss crusts on the surface of plateau zokor mounds in the rodent degradation area of Henan County, Qinghai Province were taken as the research samples, and the fresh zokor mounds with native meadow and without crust were taken as the control. The physical and mechanical characteristics of different types of soil crusts, the rule of water erosion and the correlation between soil erosion and erodibility factors were analyzed and discussed by combining field investigation and in-situ simulated rainfall erosion test. [Results](1)The soil moisture contents of different crusts on the surface of mound decreased in the order: moss crust>lichen crust>physical crust, and there was significant difference between native meadow and fresh zokor mound(p<0.05). The order of soil compactness and cohesion within 0—2 cm was native meadow>physical crust>moss crust>lichen crust>fresh zokor mound. Compared with fresh zokor mounds without crusts, the occurrence of soil crusts could improve the water and soil conservation capacity of mound soil by modifying the basic characteristics of soil.(2)The total amount of soil loss deceased in the order: fresh zokor mound >physical crust>lichen crust>moss crust>native meadow, and had a positive correlation with rainfall intensity. The 10～15 minutes of rainfall erosion was the sensitive period of rainfall erosion in different soil crusts, and the soil loss rate increased first and then decreased. Compared with fresh mounds without crusts, different types of mound crusts could improve the soil erosion resistance. The order of soil erosion resistance is: native meadow>moss crust>lichen crust>physical crust>fresh zokor mound.(3)Based on the double test method of correlation degree and correlation analysis, soil crust mainly changed the basic physical and mechanical properties of the surface soil of the mound, which led to the difference of soil erosion. Among them, soil moisture content, density and void ratio were the key factors affecting soil erosion. [Conclusion] Soil crusts can inhibit the water erosion of alpine meadow mound soil to varying degrees by promoting the basic physical and mechanical properties of soil.

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Last Update: 2023-08-10