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[1]Zhang Meng,Hu Guiqing,Zhang Wentai,et al.Effect of Long-Term Vegetation Coverage on Runoff and Sediment Reducing Ability of Purple Soil Slope[J].Research of Soil and Water Conservation,2024,31(05):164-172.[doi:10.13869/j.cnki.rswc.2024.05.029]

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Effect of Long-Term Vegetation Coverage on Runoff and Sediment Reducing Ability of Purple Soil Slope

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 05 Page number: 164-172 Column: Public date: 2024-08-10

Title:: Effect of Long-Term Vegetation Coverage on Runoff and Sediment Reducing Ability of Purple Soil Slope

Author(s):: Zhang Meng¹, Hu Guiqing¹, Zhang Wentai¹, Yang Lirong¹, Jiang Qunli², Wang Zhigang³; (1.Xinjiang Key Laboratory of Soil and Plant Ecological Processes, College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China; 2.Water Affairs Bureau, Chishui, Guizhou 564707, China; 3.Hubei Key Laboratory of Water Resources and Ecological Environment Science, Institute of Soil and Water Conservation, Yangtze River Academy of Sciences, Wuhan 430010, China)

Keywords:: vegetation; soil erosion; runoff coefficient; sediment content; benefits of runoff and sediment reduction

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2024.05.029

Abstract:: [Objective]The aims of this study are to investigate the changing rates of runoff and sediment reduction capacity for long-term forest and grass vegetation coverage plots, and to provide a scientific basis for vegetation restoration of soil and water conservation in southwest rocky mountain area of China. [Methods]From 2018 to 2021, the data of runoff and sediment yield, vegetation coverage as well as soil surface water content in the five runoff plots, i.e. 15° bare land, 15° grassland, 15° forest land, 30° forest land and 30° grassland, were observed in Tiantai Town, Chishui City, Guizhou Province. The changes of runoff coefficient and sediment concentration were used to reflect the changing rates of runoff and sediment reduction capacity in each plot. [Results]The order of flow and sediment reduction benefits in the five communities was 30° grassland>15° forest>30° forest>15° grassland>bare land. Among them, the vegetation coverage of the 30° grassland community was the highest, at 92.8%, with runoff and soil erosion modulus of 2.43 mm and 6.51 t/(km²·a), respectively. The bare land community had the highest runoff, at 153.49 mm, and the highest soil erosion modulus, at 1 214.5 t/(km²·a). The runoff coefficient of the 15° grassland community decreased the fastest at 0.292%/a, and its sediment content also decreased the fastest at -14.6 g/(L·a). There was a significant negative correlation between vegetation coverage and runoff, a significant negative correlation with sediment concentration, and a significant positive correlation with soil surface water content. [Conclusion]High vegetation coverage is beneficial for vegetation restoration, water conservation, and soil erosion control. For the 15° grassland slope with relatively severe soil erosion, the long-term vegetation coverage has a more significant effect on soil and water conservation.

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Last Update: 2024-08-10