Abstract: In this paper, Sangong River Basin in Fukang was selected for case study. The landscape ecological characteristics of the inland river watershed of arid area were analyzed. Based on the landscape structure, the authors brought forward indexes and formulas to measure landscape damage degree and risk value of ecosystem. The system sampling method was used to make it a spatial variance, and the semivariagram analysis and block Kriging were conducted to explore the spatial characteristics and distribution of landscape ecological risk in the study area. The results indicated that the ecological risk in the study area tends to extend, and three belt areas with high ecological risk were formed in this region. Based on the results, the most important regions of eco environmental protection in the study area were determined, and the management countermeasures of eco environmental protection and strategies were put forward.

Key words: Exserohilum monoceras, Echinochloa crus-galli, Herbicide, Synergism, Paddy field