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[1]WANG Tao,XIAO Caixia,LIU Jiao,et al.Evolution of Spatial and Temporal Patterns of Landscape and Its Impact on Landscape Ecological Risk in Qilu Lake Basin[J].Research of Soil and Water Conservation,2019,26(06):219-225.

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Evolution of Spatial and Temporal Patterns of Landscape and Its Impact on Landscape Ecological Risk in Qilu Lake Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 06 Page number: 219-225 Column: Public date: 2019-10-17

Title:: Evolution of Spatial and Temporal Patterns of Landscape and Its Impact on Landscape Ecological Risk in Qilu Lake Basin

Author(s):: WANG Tao¹, XIAO Caixia¹, LIU Jiao², LU Xin³; 1. Guizhou Forestry Survey and Design Co., Ltd., Guiyang 550003, China;
2. Southwest Forestry University, Kunming 650224, China;
3. Guizhou Forestry Survey and Planning Institute, Guiyang 550003, China

Keywords:: landscape pattern; type conversion; ecological risk; Qilu Lake Basin

CLC:: P901;F301.24;X826

DOI:: -

Abstract:: The sustained drought has caused the water surface of Qilu Lake to shrink dramatically and the ecosystem to degenerate continuously. To research the landscape spatial changes and its impacts on landscape ecological risk, the ecological pressure and risk caused by the expansion of economic scale and land use is increasing day by day. The Qilu Lake Basin was taken as the study area. Landsat remote sensing images of the Qilu Lake Basin in 1995, 2000 and 2015 were classified to establish the vector database of landscape structure types, the composition and transformation characteristics were analyzed in this paper. Based on landscape ecological risk assessment theory and landscape pattern index, the landscape ecological risk assessment model was constructed. Ecological risk values of 219 ecological risk sampling plots and the spatial distribution characteristics of different levels of ecological risk were evaluated. The results showed that:(1) during the past 30 years, the landscape pattern of the Qilu Lake Basin had changed significantly, the main characteristics were that the expansions of construction land and wetland, and the their areas increased, the reduction of water area, the water area decreased by nearly 50%, agricultural land, forest land and unused land presented two-way transformation, but their area decreased in general; (2) landscape fragmentation degree was less than 0.1, it was relatively slight; agricultural land and forestland had obvious landscape advantages, occupying the dominant position in this basin; wetlands had the greatest degree of interference and were most vulnerable to changes in the external environment; (3) most of the ecological risk values in the sample plots were between 0.5 and 1.0, and the basin was mainly at the lower ecological risk level, but the lower and higher ecological risks were transforming to the higher ecological risk level, which meant that the ecosystem of the basin tended to deteriorate; the spatial distribution of ecological risk in the basin had obvious characteristics of location and heterogeneity, the low ecological risk was mainly located in the plain area of the basin, and the high ecological risk was concentrated in Qilu Lake, the lower and middle ecological risks distributed around the lake basins and lakes, while higher ecological risks scattered.

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