Temporal and spatial variation of vegetation NPP and its response to climate factors in southern China
In order to define the changes of the vegetation productivity in our country, net primary productivity (NPP) data of the vegetation in past 12 years of southern China was extracted based on the MODIS production and climate data from 2000 to 2011 by using space splicing and resampling treatment.The results showed that the 97.8％ of the land in southern China was covered by vegetation.From 2000 to 2011, the value of vegetation NPP changed from 598.80 to 673.07 g · m-2 , and the average NPP was 639.30 g · m-2.The value in 2000 reached the minimum and the value in 2002 reached the maximum.Linear trend between the average annual vegetation NPP and time was calculated by Pearson correlation coefficient.And it showed that, the vegetation NPP was increasing in most areas of southern China.The vegetation NPP was positively correlated with the temperature in past 12 years in most parts of southern China.And many areas reached the significant or extremely significant correlation level.The vegetation NPP was negatively correlated with the precipitation in more than half regions of southern China.The above results showed that the spatial distribution of vegetation NPP was uneven in southern China and strongly influenced by temperature and precipitation.
国家科技期刊平台
NSTL
万方数据
维普
