关键词: 生态风险, 景观结构, 土地利用, 时空差异, 贵州省

Abstract: [Objective] The aim of the study was to explore the temporal and spatial variations of landscape ecological risk in the Guizhou province. [Method] Based on the land use data of Guizhou province in 2000, 2005 and 2010, the land use map in 2020 was simulated with the help of Markov and CLUE-S model. Landscape ecological risk index was quantitatively constructed by landscape structure theory. Landscape ecological risk was evaluated based on land use data in 2000, 2010 and 2020. [Results] The results showed:① the level of landscape ecological risk decreased from 2000 to 2020. The lower level and higher level of ecological risk mainly distributed in the east and west of study area, respectively;② the type of ecological risk transformed among low ecological risk, relatively low risk and moderate ecological risk. The improvement and degradation type atlas of landscape ecological risk were located in the central and west of the study area, respectively and there was a growing trend from 2000 to 2020. ③ the ecological risk types mainly occurred in the first three gradient of landform relief with a trend of one gradient > three gradient > second gradient > five gradient > four gradient. The changes in ecological risk types were mainly in one, second and three gradients of landform relief. [Conclusion] The landscape ec-ological risk persistently decreased. The natural conditions, population pressures and the policy of reforestation of the cultivated land were important factors affecting landscape ecological risk.

Key words: ecological risk, landscape structure, land use, spatio-temporal differences, Guizhou province