Characteristics of Vegetation NPP and Response to Climate Change in the Yangtze River Basin from 2000 to 2021
The Yangtze River basin is an important functional area for soil conservation and water conservation in China.Vegetation net primary productivity(NPP)is an important indicator of the carbon budget of terrestrial ecosystems.Studying the changing char-acteristics and main driving factors of vegetation NPP in the Yangtze River basin has important guiding significance for achieving the goal of carbon neutrality and improving ecosystem functions.Based on data from Moderate-Resolution Imaging Spectroradiome-ter(MODIS)and meteorological stations,using Theil-Sen trend analysis,Mann-Kendall test and other methods,combined with Thornthwaite Memorial climate model,the temporal and spatial variation characteristics of vegetation NPP in the Yangtze River ba-sin from 2000 to 2021 were analyzed,and the relative role of climate change and human activities in its change was quantitatively evaluated.The results showed that:(1)The annual average NPP of vegetation from 2000 to 2021 was 552.2 gC·m-2.The fluctua-tion in time increased,with an increase rate of 3.71 gC·m-2·a-1.Spatially,the eastern part was larger than the western part,and the southern part was larger than the northern part.The vegetation NPP in the Chengdu-Chongqing Economic Zone,the middle reaches of the urban agglomeration and the Yangtze River Delta region with a higher degree of urbanization was smaller than that in the sur-rounding areas.(2)Vegetation NPP was positively correlated with annual precipitation and annual average temperature.(3)The utili-zation rate of vegetation to climate resources in most of the Yangtze River basin was less than 50%,and more than 50%of the area was mainly distributed in the transition zone from the Qinghai-Tibet Plateau to the Sichuan Basin and to the Yunnan-Guizhou Pla-teau.(4)The relative role of climate change and human activities in the process of vegetation NPP change in the Yangtze River ba-sin had significant spatial and temporal differences.The area of vegetation NPP changing dominated by climatic factors was the larg-est,accounting for 55.15%.In 95.99%of the regional dominated by climatic factors,the NPP of vegetation increased.The area of vegetation NPP changing area dominated by human activities accounted for 24.22%.In 82.08%of the areas dominated by human activities,the NPP of vegetation decreased.Excessive reclamation and urban expansion were important reasons for the decrease of vegetation NPP.
the Yangtze River basinvegetation productivityclimatic resource utilizationclimate changehuman activity
NETL
NSTL
万方数据
