TEMPORAL AND SPATIAL EVALUATION OF ECOLOGICAL SECURITY IN THE DRY AND HOT VALLEY AREA OF THE JINSHA RIVER IN YUNNAN PROVINCE, CHINA, FROM 2000 TO 2020.

The Jinsha river valley in Yunnan Province is a typical dry and hot area in China. By introducing landscape pattern indices, we conducted a spatio-temporal evaluation of regional ecological security from 2000 to 2020 and quantitatively analyzed the influence of its driving factors. Those results showed that: (1) the indices that could characterized the landscape pattern were Division (DIVISION), Mean of Contiguity (CONTIG_MN), Patch Density (PD), and Area Weighted Mean of Shape (SHAPE_AM). (2) From 2000 to 2020, the regional ecological security resulted from cooperative effects of landscape pattern indices and normalized difference vegetation index (NDVI). In 2000, in addition, ecological security resulted from the effects of water quality indices. (3) In 2000, most areas in Yuanmou, Wuding County, and Dongchuan District were in an unsafe or relatively unsafe state. In 2020, some areas of Yuanmou, Wuding, and Yongsheng County were in an unsafe or relatively unsafe state. (4) From 2000 to 2020, the impact of human activity intensity gradually strengthened. Compared with social and economic driving factors, natural driving factors like rainfall and altitude have a greater impact. Our findings can provide theoretical basis and scientific guidance to formulate regional ecological development strategies. [ABSTRACT FROM AUTHOR]