Spatiotemporal Variability and Climatic Drivers of Net Primary Productivity on Hainan Island during 2000-2018
As a national ecological civilization experimental zone,the net primary productivity(NPP)change trends and their climate drivers on Hainan island have not been comprehensively investigated.In this study,we utilize MODIS data to articulate the spatiotemporal variations of NPP,vegetation respiration(Re),and vegetation primary productivity(GPP)on Hainan island during 2000-2018.Moreover,we employ multiple linear regression analysis to quantify and identify the climate drivers to dominate NPP variability.Experimental results indicate that GPP,NPP and Re all exhibit increasing trends from 2000 to 2018.The smallest increasing trend is observed for NPP(0.016 kg C·m-2·a-1).NPP yields a non-significant decreasing trend in the central to northern areas of Hainan island while an increasing trend in the remaining regions.Multiple linear regression analysis shows that solar radiation is the main climatic factor to dominate the NPP changes in most areas of Hainan island.In contrast,NPP changes in the central to northern part of Hainan Island are driven by both temperature and precipitation.In the central to southern Hainan island,NPP is driven by both of precipitation and solar radiation.Temperature is the main driver of NPP change in the southwestern and southern parts of Hainan island.
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