Net primary production(NPP)serves as a crucial metric for assessing the carbon cycling within ecosystems.Based on MOD17A3HGF data and meteorological data,we use Theil-Sen Median trend analysis,centroid modeling and correlation analysis to analyze the spatiotemporal patterns and influencing factors of NPP in Yunnan province from 2011 to 2020.The results reveal that:from 2011 to 2020,NPP in Yunnan province displays a declining spatial distribution trend from west to east and from south to north,with an average value of 1 025.22 gC·m-2·a-1;the high fluctuation area is mainly distributed in Diqing Tibetan autonomous prefecture and Nujiang Lisu autonomous prefecture;the significant correlation between NPP and temperature is mainly distributed in eastern Yunnan,and the significant correlation between NPP and precipitation is mainly distributed in central and northeast Yunnan.The order of factors influencing vegetation recovery in the study area is:climate change＞combined impact of climate change and human activities＞human activities.In terms of vegetation degradation,the sequence of factors is:human activities＞combined impact of climate change and human activities＞climate change.
关键词
NPP/重心模型/时空变化/影响因素/人类活动/云南省
Key words
net primary production/center of gravity model/spatial-temporal variation/influencing factor/human activity/Yunnan province
维普
万方数据