Subei Coastal Forest Vegetation Dynamics And Its Regional Climate Effect

Based on meteorological data of subei coastal areas from 1961 to 2006, this paper analyzed a long time scales regional climate change. Processing with normalized vegetation index and forest coverage change and applicating remote sensing, GIS technology,10 years of coastal areas of forest vegetation dynamics, the change of land use, and the influence of regional climate was studied. The main research results are as follows:(1) Under the trend of rising temperatures in the environment, temperature of subei coastal areas rise somewhat, but in recent 17a to temperatures rise by a slowdown. In different seasons, summer temperatures has a smaller growth than the other three seasons and has a decreasing trend. August has a negative trend in temperature change and also decadal variability range shows decreasing trend.(2) The increasing trend of NDVI in subei coastal area reflecting vegetation activities.In plant growth season, NDVI increase obviously, and in July and August is especially remarkable. While in the harvest season of June and November the NDVI is low.(3) There is obvious regional diversity of vegetation coverage in yancheng, nantong, Lianyungang from 1999 to 2007.The value of vegetation coverage in 1999:yancheng> lianyungang>nantong. To 2007, vegetation status of three cities has overall improved, but in some local region has degradation trend. For example, the vegetation coverage increase obviously in lianyungang, Nantong, but reduce in some local area of yancheng in 2007.(4) in recent years, the forestland area and urban area has a growing trend in subei coastal area, while the area of water, bare land, farmland and grassland show decreasing trend. The increase of forestland area has very good inhibition on typhoon to protect the local people's life and property security. Typhoon frequency is down and intensity is weak.In addition, the correlation study of forestland and surface temperature of coastal typical county(JianHu)found that forest has a significant impact on microclimate and has a whole cooling effect for county.