Abstract:

Based on the 2001-2010 MODISEVI data and meteorological data including temperature,rainfall and sunshine hours data,this paper studied the dynamic change of vegetation in the Yangtze River Delta by using statistical method.The results are as follows.① The southwest of the region was covered by forest,the northeast part was dominated by cropland,the central part was urban agglomeration.From 2001 to 2010,the region witnessed an increase in urban at the expense of cropland and forest,with the total conversion area accounting for 32% of entire area.② Due to the rapid urbanization,the vegetation index(EVI) had showed a slightly decreasing trend in the whole region,with an average rate of 0028 every 10 years.For the seasons,EVI in the summer and winter tended to decrease (especially in August and February),while spring and autumn showed an increasing trend (especially in October and May).③ For different vegetation types,the urban showed the largest decreasing trend(-0076/10 a,R2=0.77）,while slightly decreasing trend for cropland and little for forest.④ The annual maximum EVI of forest had the strongest correlation with the sunshine hour from February to April.Thermal factors (i.e.temperature and sunshine hours) were the main climatic factors affecting the vegetation growth,while the rainfall had a negative correlation with EVI due to the humid climate in the region.EVI had weak correlation with climatic factors mainly for human activities in urban region