Spatio-temporal variation of vegetation coverage in forest and grassland and its relationship with temperature and precipitation changes in Guizhou province during 2001~2014
Using the MODIS-NDVI,temperature and precipitation data from 2001 to 2014,the re-search analyzes the spatio-temporal variation of vegetation coverage in forest and grassland and its rela-tionship with temperature and precipitation changes in 14 years in Guizhou province. The results show that:1 )the spatio-temporal variation of vegetation coverage in forest and grassland was obvious in Guizhou province. Spatially,the variation was characterized by longitudinal zonality,but no obvious latitudinal zonality. Temporally,the vegetation coverage appeared rising tendency and its value in-creased from 0 . 73 to 0 . 82 . The change of vegetation coverage mainly occurred between the high level vegetation coverage and higher level vegetation coverage. 2)Accompanying the fluctuations of the tem-perature and precipitation,the vegetation coverage change in Guizhou had obvious positive correlation with the precipitation change,but it had not significant correlation with the temperature change. 3)As for as the longitudinal difference of correlation between vegetation coverage change and precipitation change,which showed that,in the west of 104. 5°E,the impact of precipitation change on vegetation coverage change was more and more obvious from east to west,in the region of 104. 5 ~109°E,the impact of precipitation change on vegetation coverage change was more and more obvious from west to east,in the east of 109°E,the impact of precipitation change on vegetation coverage change was smal-ler and smaller from west to east. 4)As for as the latitudinal difference of correlation between vegetation coverage change and precipitation change,which showed that,in the south of 25°N,the impact of pre-cipitation change on vegetation coverage change was more and more obvious from north to south,in the region of 25~26°N,the precipitation almost had on effect on vegetation coverage change,in the re-gion of 26~27. 5°N,the impact of precipitation change on vegetation coverage change was more and more obvious from south to north,in the north of 27. 5°N,the impact of precipitation change on vege-tation coverage change was smaller and smaller from south to north.
NETL
NSTL
万方数据
维普
