Analyzing variation characteristics of vegetation net primary productivity(NPP)in Guangxi
Using MOD17A3 data from EOS/MODIS,this article analyzed spatio-temporal characteristics of vegetation net primary productivity (NPP)in Guangxi.The results showed that NPP in 2005 had the lowest value (625 gC·m-2·a-1), while 2003 had the largest mean value(714 gC·m-2·a-1);and the average annual value of the vegetation NPP was 662 gC·m-2·a-1 from 2001 to 2010.The NPP value of different type vegetation showed great differences, for example,the NPP of forests,shrubs and crops was 834,614,517 gC·m-2·a-1 respectively.In this decade,annual NPP declined significantly,and the annual average temperature and precipitation had significant effect on NPP, the sunshine time had no significant effect on NPP time changing.The influencing factor of NPP spatial pattern was slope,following by longitude,again to topographical features,latitude,and precipitation.Annual NPP of tropical and Using MOD17A3 data from EOS/MODIS,this article analyzed spatio-temporal characteristics of vegetation net primary productivity (NPP)in Guangxi.The results showed that NPP in 2005 had the lowest value (625 gC·m-2·a-1), while2003 had the largest mean value(714 gC·m-2·a-1);and the average annual value of the vegetation NPP was 662 gC·m-2·a-1 from 2001 to 2010.The NPP value of different type vegetation showed great differences, for example,the NPP of forests,shrubs and crops was 834,614,517 gC·m-2·a-1 respectively.In this decade,annual NPP declined significantly,and the annual average temperature and precipitation had significant effect on NPP, thesunshine time had no significant effect on NPP time changing.The influencing factor of NPP spatial pattern was slope,following by longitude,again to topographical features,latitude,and precipitation.Annual NPP of tropical and subtropical forests and shrub in karst region during this ten years was less than those in non-karst region,but the for-est and agricultural vegetation had the opposite trend.Overall,the vegetation NPP was 683 gC·m-2·a-1 in non-karst region and 620 gC·m-2·a-1 in karst region.
国家科技期刊平台
NSTL
万方数据
维普
