Analysis on Relationship Between Net Primary Productivity and Evapotranspiration Based on MODIS Data in Shaanxi Province
[Objective] Analyzing the vegetation net primary productivity(NPP) and the actual evapotranspiration(ET) in Shaanxi Province,to provide theoretical support with regard to carbon cycle,water cycle characteristics of ecological environment.[Methods] Based on data of the NASA products of net primary productivity(MOD17 A3) and evapotranspiration(MOD16),the spatial and temporal variation characteristics and relationships between NPP and ET in 2000-2014 of Shaanxi Province were analyzed by using the methods of GIS and mathematical statistics.[Results] The vegetation NPP and ET both showed a spatial distribution characteristics by gradually decreasing from the south to the north.In 2000-2014,interannual variability of Shaanxi vegetation NPP presented an increasing trend.The most significant increased region was Shanbei,the second was Guanzhong,and the lowest region was Southern Shaanxi;interannual variability of ET was not significant,and showed a trend of fluctuations.Spatial correlation between NPP and ET was significant for overall province,but regional difference existed:correlation coefficient in Shanbei region was highly significant,whereas in the southern Shaanxi region,it was not significant.[Conclusion] The vegetation NPP had closer relations with ET in arid area.
NPP(net primary productivity)ET(evapotranspiration)MODISspatial distributionShaanxi Province
国家科技期刊平台
NSTL
万方数据
维普
