Changes of NDVI Spatio-temporal in Yanhe River Basin and Its Response to Precipitation
The spatio-temporal changes of NDVI and precipitation in Yanhe River Basiri were analyzed based on 8 km resolution multi-temporal NOAA AVHRR-NDVI data and precipitation data from 1982 to 2006.Meanwhile,the response of growing season NDVI to precipitation was also studied.The results showed that in recent 25 years,the mean land cover (NDVI) and precipitation had no significant change in the Yanhe River Basin.However,the NDVI and precipitation distribution of spatial were changed significantly.The NDVI value in the northwest area of the Yanhe River Basin,which mainly covered with grassland,was raised with decreased of NDVI value in the southwest area of the Yanhe River Basin,which mainly covered with forest land.At the same time,the effects of precipitation on NDVI were difference for different vegetation types.The precipitation changes affected grassland NDVI significantly,and followed with the farm land and grass-shrub land.Compared with grassland or farmland,the precipitation effect on forest land was not significant.
国家科技期刊平台
NSTL
万方数据
维普
