Ecological Environment Detection Of The Region Invaded By Bursaphelenchus Xylophilus Based On RS And GIS

The regional environment sruffered from Bursaphelenchus xylophilus in Putuo District Zhoushan, Zhejiang Province, is mainly studying object of this paper. In order to find change of ecological system after Bursaphelenchus xylophilus invaded the region, and analyze the relation between ecological environment and the disease, traditional research method was comined with RS (Remote Sensing), GIS (Geographic Information System) and GPS (Global Positioning System) to search from two aspacts: biologic factors (weather, climate, soil and so on) and abiological factors (human activities).By this study, it shows that annual temperature and annual rainfall are two meteorologic factors allimportantly contact with Bursaphelenchus xylophilus. The disease will erupt stronger when the year which has little rain and high temperature. Contrarily, the probability of the disease will be lower if temperature and precipitation approximately normal level. Furthermore, proportion of total N, available P, available K in soil are dissimilar after the disease invaded: Capacities of resistance on disease will be enhanced if infect trees are cut appropriate.Based on remote sensed image analysis, it reveals tha average patch area of vegetable was reduced and density of patches was augmented after the disease invaded. Meanwhile, the fragmentized degree also enhanced with pervasion of the disease. This paper also put forward to another viewpoint that human activity sometimes may provide approach and opportunity for spread of Bursaphelenchus xylophilus.