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[1]WANG Zhijie,LIU Shujun,YU Lifei.Characteristics of Temporal and Spatial Dynamic of Landscape Structure and Soil Conservation Function in Caohai Watershed[J].Research of Soil and Water Conservation,2020,27(04):105-112.

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Characteristics of Temporal and Spatial Dynamic of Landscape Structure and Soil Conservation Function in Caohai Watershed

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 27 Number of periods: 2020 04 Page number: 105-112 Column: 目次 Public date: 2020-06-20

Title:: Characteristics of Temporal and Spatial Dynamic of Landscape Structure and Soil Conservation Function in Caohai Watershed

Author(s):: WANG Zhijie¹, LIU Shujun², YU Lifei^1,3,4; (1.College of Life Sciences, Guizhou University, Guiyang 550025, China; 2.College of Tea Science, Guizhou University, Guiyang 550025, China; 3.Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous Region, Ministry of Education, Guiyang 550025, China; 4.Collaborative Innovation Center for Mountain Ecology & Agro-Bioengineering, Guiyang 550025, China)

Keywords:: soil erosion; soil conservation function; landscape structure; InVEST model; Caohai watershed

CLC:: S157.1

DOI:: -

Abstract:: Caohai watershed is a typical watershed in Karst Plateau of China. In recent years, the landscape structure in Caohai watershed has been obviously changed due to strong human activities, and it has a significant impact on soil erosion/soil conservation in the watershed. To reveal the effect of landscape structure changes on soil erosion/soil conservation function in Caohai watershed, the spatial-temporal characteristics of landscape structure and soil conservation function in 2009 and 2017 were quantitatively analyzed based on InVEST model. The results showed that:(1)the landscape types of Caohai watershed were the cultivated land and water body from 2009 to 2007, and the landscape structure had changed significantly with the trend of the decrease of cultivated land, water body, irrigated grassland and the increase of forest land, swamp land and construction land;(2)the actual soil erosion intensity of Caohai watershed presented the increasing trend from 2009 to 2017, the potential soil erosion per unit area and the actual soil erosion in 2009 and 2007 were 2 665.14, 125.55 t/(hm²·a)and 1 1451.19, 523.24 t/(hm²·a), respectively;(3)the soil conservation amount of whole watershed and each landscape types displayed the increasing trend from 2009 to 2017 with the characteristics of ‘overall improvement and local deterioration'; the soil conservation amount per unit area in 2009 and 2017 was 2 539.60 t/(hm²·a)and 10 927.94 t/(hm²·a), respectively; the growth rate of soil conservation amount was the fastest for shrub grassland, and was the slowest for swamp land. Therefore, optimizing the landscape structure of the river basin, as well as decreasing the disturbance of human activities and increasing the vegetation coverage will be great beneficial to the improvement of soil conservation function in Caohai watershed. These results can provide theoretical and scientific basis for ecological restoration and construction and spatial planning of Caohai watershed.

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Last Update: 2020-07-09