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[1]LI Xin,YANG Chaoxian,XIN Guixin,et al.Landscape Ecological Risk Characteristics of Three Gorges Reservoir Area Based on Terrain Gradient[J].Research of Soil and Water Conservation,2023,30(02):156-164.[doi:10.13869/j.cnki.rswc.2023.02.019]

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Landscape Ecological Risk Characteristics of Three Gorges Reservoir Area Based on Terrain Gradient

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 02 Page number: 156-164 Column: Public date: 2023-03-10

Title:: Landscape Ecological Risk Characteristics of Three Gorges Reservoir Area Based on Terrain Gradient

Author(s):: LI Xin¹, YANG Chaoxian¹, XIN Guixin², YANG Kui¹, JIANG Haoyu¹; (1.College of Resources and Environment, Southwest University, Chongqing 400716, China; 2.Yangtze Normal University, Chongqing 408100, China)

Keywords:: landscape ecological risk; three gorges area; terrain gradient

CLC:: F301.2; X171.1

DOI:: 10.13869/j.cnki.rswc.2023.02.019

Abstract:: Landscape ecological risk assessment can better reflect the negative impact of external stressors on the ecosystem, and analyze the distribution characteristics of landscape ecological risk levels on the terrain gradient, which can provide scientific basis for ecological civilization construction and human activities control in the Three Gorges reservoir area. Based on Landsat(OLI/ETM+)image data in 2000, 2010 and 2020, the landscape ecological risk index model was built by using GIS grid method and Kriging interpolation method, and the characteristics of landscape risk grade in Three Gorges reservoir area were studied by selecting elevation, slope and topographic index. The results show that:(1)the distribution of landscape ecological risk grades in the Three Gorges reservoir area showed strong spatial differentiation characteristics, and the area of each landscape ecological risk grade showed dynamic changes; during the whole study period, the areas with low-risk, medium-risk and high-risk increased, while the areas of lower-risk and higher-risk areas decreased;(2)the areas where the landscape pattern changed concentrated in areas where the topographic index was less than 1.24; the change type of landscape ecological risk level was mainly stable, followed by early change type, late change type, repeated change type and continuous change type; in the early and late stage, the transformation of landscape ecological risk level was characterized by ‘high-high-high' and ‘high-high-medium', respectively;(3)the characteristics of landscape ecological risk grade terrain gradient showed that the low-risk areas in the upper reaches of the reservoir area spread more to areas with topographic index greater than 0.62, and the distribution of low-risk areas concentrated in areas with topographic index greater than 1.03, while the higher-risk areas in the middle and lower reaches of the reservoir area mainly transformed into high-risk areas and medium-risk areas, with the areas transformed into high-risk areas concentrated in areas with topographic index less than 1.03 and those transformed into medium-risk areas concentrated in areas with topographic index less than 1.03. On the whole, the risk value of landscape ecology in the Three Gorges Reservoir area has increased, and the overall ecological environment has been under great pressure. The changes of landscape pattern concentrated in the early stage and the areas with topographic index less than 1.24.

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Last Update: 2023-03-10