Regional eco-risk analysis based on landscape structure and spatial statistics

摘要

This paper describes a case study of eco-risk appraisal in the Xingguo County, an red soil hill region in Jiangxi province. The appraisal was conducted based on landscape disturbance index and landscape fragility. Spatial distribution and gradient differentiation characteristics of the eco-risks in the study area were analyzed by means of spatial statistics like spatial autocorrelation and subanalysis of variance. Conclusions from the study are as follows: Ecorisk degree was positive correlation, and a decreasing trend exits with the increase of grain size of landscape patches. Ecoenvironment quality mounted up to a small extent while and the area with high eco-risk lessened in the period from 1994 to 2005 in Xingguo County. Eco-risk degree in the east-middle lump of sand and its peripheral regions were high. The step length of the eco-risk index's spatial differentiation is quite short, 43km in 1994 and 9.3km in 2005.