To study the spatial and temporal variation characteristics of vegetation net primary productivity(NPP)and its responses to climate change in the Inner Mongolia section of the Yellow River can provide scientific basis for environmental protection and ecological restoration.Based on the MOD17A3 dataset and meteorological observation data,the spatial and temporal variation characteristics of vegetation NPP and its responses to climate change in the study area from 2002 to 2021 were studied by utilizing trend analysis,deviation analysis,coefficient of variation,correlation analysis and residual analysis.The results showed that:(1)vegetation NPP showed the double trends of increasing and fluctuating,and the deviation was characterized by an obvious stage,with negative deviation mainly before 2011 and positive deviation mainly after 2012.(2)The average vegetation NPP was 169.15 gC·(m2·a)-1,increasing from west to east.The area with vegetation NPP of 101～250 gC·(m2·a)-1 accounted for 77.0％of the total area,and the bare land＜shrubs＜others＜grassland＜agricultural land＜forestland.In 69.1％of the study area,the coefficient of variation of vegetation NPP was below 0.2,which was generally stable.(3)The partial correlation coefficient between vegetation NPP and temperature was 0.31,and only 6.7％of the study area passed the significance test of 0.01.The partial correlation coefficient between vegetation NPP and precipitation was 0.62,and 81.1％of the region passed the significance test of 0.01.It indicated that precipitation was the main climatic factor affecting the significant increase of vegetation NPP in the study area.(4)A combination of climate change and human activities led to changes in vegetation NPP.
关键词
NPP/黄河内蒙古段/气候响应/残差分析
Key words
NPP/Inner Mongolia section of the Yellow River/Climate response/Residual analysis
万方数据