Spatio-temporal dynamics of NPP and its response to human activities and climate change in Guizhou Province
[Objective]Climate change has exerted serious impacts on terrestrial ecosystems.Understanding the dynamics of ter-restrial ecosystem is of vital importance to mitigate the effects of climate change.The objective of this study is to elucidate the temporal and spatial variations of Net Primary Productivity(NPP),as well as their underlying mechanisms across Guizhou Prov-ince,China under the background of climate change and human activities.[Methods]The Theil Sen-MK trend analysis and Hurst index were employed to investigate the temporal and spatial variations of NPP across Guizhou Province,and the MGWR model was used to evaluate the impact of human activities and climate change on NPP.[Results]The result show that:(1)The NPP in Guizhou Province exhibites a prevailing increased trend,NPP of forest ecosystems significantly increases,while land exhibites a decline trend during the period from 2000 to 2020;(2)The NPP in Guizhou Province is expected to increase in the future according to Theil Sen-MK trend analysis and Hurst index;(3)The MGWR model indicated that NPP is predominantly affected by human activities from 2000 to 2020.Specifically,human activities lead to a reduction in NPP,while climate factors contribute to an NPP increase from 2000 to 2010.Additionally,human activities increase NPP in northeastern Guizhou from 2010 to 2020.[Conclusion]Our study reveals that the NPP in Guizhou Province has continued to increase over the past 20 years,with human activities and climate change jointly affecting its spatial variation.These findings provide important theoret-ical basis for the investigation of the mechanism driving changes in NPP.
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