The Relationship Between Vegetation Spatial Pattern And Invasion & Spread Of Bursaphelenchus Xylophilus

Bursaphelenchus xylophilus which relies on media insects for communication, is a disaster of pine. There are many factors can influence the invasion and spread of Bursaphelenchus xylophilus. The main factors include insect biological characteristics, meteorological factors, site conditions and vegetation spatial pattern et.al. The pest's habits and the meteorological factors can't be controlled by human being, therefore, this paper aimed to find out the relationship between vegetation spatial pattern and invasion&spread of Bursaphelenchus xylophilus.This paper integrated the principles and technology of remote sensing and Geography information system(GIS) to carry out the dynamic change of multi-scale analysis of vegetation spatial pattern in Zhoushan, Zhejiang province. And identify the occurrence and spread rate of Bursaphelenchus xylophilus under different forest composition and the structure of patches.The results show that, pine patches'large scale. open boundary zone and gathered distribution are favorable conditions for the spread of Bursaphelenchus xylophilus. The pine patches which were invaded were shrunk or disappeared, the fragmentation degree was deeper, the vegetation spatial pattern changed correspondingly.However, due to the increased discrete degree of pine patches, the block function for the spread of Bursaphelenchus xylophilus amplified. Thus, we can draw the following conclusion:we can inhibition the activities (its flight characteristics) of the media insects(Monochamus alternatus Hope) to control the spread of Bursaphelenchus xylophilus by reducing the pine patches area and planting density, and increasing its fragmentation degree.