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[1]CHEN Jia,LI Zhongwu,FANG Nufang,et al.Spatiotemporal Patterns of Small Watersheds with Different Vegetation Coverage Thresholds in Red Soil Hilly Region[J].Research of Soil and Water Conservation,2023,30(02):186-192.[doi:10.13869/j.cnki.rswc.2023.02.051]

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Spatiotemporal Patterns of Small Watersheds with Different Vegetation Coverage Thresholds in Red Soil Hilly Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 02 Page number: 186-192 Column: Public date: 2023-03-10

Title:: Spatiotemporal Patterns of Small Watersheds with Different Vegetation Coverage Thresholds in Red Soil Hilly Region

Author(s):: CHEN Jia¹, LI Zhongwu^2,3, FANG Nufang⁴, LIU Cheng⁵, NING Ke³, WANG Lingxia³; (1.College of Agriculture, Guizhou University, Guiyang550025,China; 2.College of Resources and Environmental Sciences, Hunan Normal University, Changsha410081,China; 3.College of Environmental Science and Engineering, Hunan University, Changsha410082,China; 4.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi712100,China; 5.International Research and Training Center on Erosion and Sedimentation, Beijing100048,China)

Keywords:: vegetation coverage; threshold effect; soil erosion; small watershed; red soil hilly area

CLC:: S157.1; S157.2

DOI:: 10.13869/j.cnki.rswc.2023.02.051

Abstract:: Vegetation coverage is a key indicator reflecting soil erosion status. Implementing vegetation restoration is an important measure to control soil erosion in small watersheds. However, it is not clear how much vegetation coverage can be restored in small watersheds to effectively control soil erosion. Based on the threshold effect of vegetation coverage in small watersheds in soil erosion control, we analyzed the spatiotemporal changes of vegetation coverage in 33 157 small watersheds in the red soil hilly area from 2000 to 2015, and evaluated the spatiotemporal distribution patterns of small watersheds with different vegetation coverage thresholds in order to precisely formulate erosion control methods and countermeasures in small watersheds. The results show that:(1)from 2000 to 2015, the vegetation coverage of 84% of the small watersheds showed an increasing trend, vegetation coverage in 15% of the small watersheds had decreased, and vegetation coverage in only 1% of the small watersheds did not change;(2)small watersheds with vegetation coverage less than 40%(low threshold zone)accounted for small portion of the total watersheds and relatively stable(3%～7%), indicating that the situation of artificial control of soil erosion in small watersheds had been reversed, but cultivated land was still the focus of erosion control;(3)the proportion of small watersheds with vegetation cover at 40%～80%(transition zone)had been the highest(more than 83%), and the control method of ‘natural restoration as the main, artificial management as the supplement' should be adopted, focusing on the optimal allocation of land use structure;(4)the proportion of small watersheds with vegetation cover greater than 80%(high threshold zone)increased from 1%～2% before 2010 to 14% in 2015. It showed that the small watersheds with natural restoration vegetation coverage conditions had increased significantly. The implementation of natural restoration(such as enclosure)is a preferred selection for small watersheds with high thresholds.

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Last Update: 2023-03-10