Temporal and spatial pattern of NPP in Yulin and its influencing factors during the desertification reversal
An in-depth understanding of the spatial and temporal pattern of NPP and its influencing factors dur-ing the process of desertification reversal is of great scientific significance for the regulation of carbon cycle and the implementation of ecological engineering in desertification reversal zone.This paper estimated the values of NPP in Yulin from 2000 to 2020 using CASA model,and quantitatively analyzed the impact of climate change and human activities on NPP change through difference analysis,trend analysis and correlation analysis.The re-sults showed that:(1)During the desertification reversal process,the values of NPP(calculation in C)of Yulin showed a fluctuating and increasing trend with a rate of 12.39 g·m-2·a1,and displayed a spatial distribution pat-tern of low west and high east.The area with an increasing trend of changing NPP accounted for 98.4％of the to-tal area of Yulin,and only 1.6％showed a decreasing trend.(2)The correlation between the NPP and the temper-ature was not significant,but the NPP was positively correlated with precipitation.The influence of human activi-ties on NPP was mainly positive.(3)The change of NPP in the Mu Us Sandy Land in western Yulin was domi-nated by climate change,showing more sensitive to changes in precipitation.The change of NPP in the central and eastern regions of Yulin was dominated by human activities.The areas dominated by climate change and hu-man activities accounted for 43.1％and 56.9％of the total area of Yulin,respectively.The restoration of vegeta-tion in the sandy area of western Yulin was subject to the supply of water resources,and human activities such as returning farmland to forest in the central and eastern regions have shown a more positive effect on the restoration of vegetation.
NETL
NSTL
万方数据
维普
