Vegetation Growth Based On MODIS And The Relationship Between Vegetation And Grasshoppers Of Grasshoppers Plague Areas In Aletai

Grasshoppers has been a serious problem in Xinjiang grasslands.According to its ecological features,studying the habitat of grasshoppers using remote sensing technology is an important research project for early warning.Vegetation is not only food but also habitat of grasshoppers.Therefore,the study of vegetation in grasshoppers plague areas would be great important and valuable to set up models of grasshoppers plague forecast and prevention.In this paper,grasshopper plague areas in Aletai where grasshoppers break out frequently have been chosed as the study sites based on MODIS-NDVI with 250m spatial resolution.The main results are as follows:1.Using MODIS-NDVI data,vegetation growth dynamic in the grasshoppers plague areas in Aletai grassland from 2000 to 2006 are analyzed. Results show that the NDVI of the four grasshoppers plague areas in growth period has spatio-temporal patterns.The average monthly NDVI is varied from 0.25 to 0.55 from May to August. The monthly variations of the NDVI are very remarkable. Vegetation growth is best in July in most yesrs. The character of vegetation change showed that the vegetation growth in this area is becoming better in the recent seven years. Vegetation growth in Habahe is better than others.2. By means of the MODIS-NDVI and climatic data set in Aletai from 2000 to 2006, the correlation of NDVI with climate factors are analyzed in Habahe and Qinghe in this paper. The analysis shows that air temperature and precipitation are significantly correlative with vegetation growth, which influences NDVI. And precipitation was not strong correlation relatively with Vegetation growth in humid areas than arid areas.3. Based on the investigated data collected during 2006~2007, this paper discusses the relationship between the vegetation with grasshoppers in the grasshoppers plague areas. Results indicate: grasshoppers plague was strong correlation relatively with Vegetation growth.Grasshoppers is mainly distributed in mountain desert grasslands, mountain grasslands and plain grasslands. Vegetation coverage for high-density grasshoppers is between 50%~60%. And there is no notable correlation relatively between vegetation height and grasshopper density.