三峡库区森林净初级生产力时空变化及气候响应OA

Based on MOD17A3HGF,MCD12Q1,DEM,and meteorological data,this paper took the Three Gorges Reservoir Area as the research area,and used Theil-Sen Median trend analysis,Mann-Kendall significance test,coefficient of variation,and correlation coefficient to study the spatiotempo-ral changes and climate response of forest net primary productivity(NPP)from 2000 to 2023.The research results are as follows.1)From 2000 to 2023,the annual average NPP of forests showed a fluctuating upward trend,with annual growth volume of 2.38 gC•(m2•a)-1 and an average value of 663.22 gC•(m2•a)-1;in addition,the forest NPP presented a spatial distribution pattern of"high in the middle and low in the two wings",and increased first and then decreased with the elevation with increasing elevation.2)The overall growth status of the forest had improved over the past 24 years.And the improvement,maintenance,and degradation areas of forest NPP status were 13 956,1 593,and 163 km2,accounting for 88.82%,10.14%,and 1.04%of the total area,respectively;besides,the coefficient of variation of forest NPP displayed a spatial pattern of"mainly low fluctua-tions,coexisting high and low fluctuations".3)The overall contribution of climate factors to forest NPP growth was positively correlated,with temperature contributing slightly more than precipitation.