摘要
深入认识沙漠化逆转过程中植被净初级生产力(NPP)的时空格局及其影响因素,对沙漠化逆转区碳循环的调控及生态工程的实施具有重要的科学意义。基于光能利用率模型(CASA)对2000—2020年榆林市植被NPP进行估算,通过差值分析、趋势分析、相关性分析等方法定量分析了气候变化和人类活动对NPP变化的影响。结果表明:(1)沙漠化逆转过程中榆林市植被NPP呈波动增加趋势,增加速率为12.39 g·m^(-2)·a^(-1)(以C计量),并表现出西低东高的空间分布格局,呈增加趋势的区域占榆林市总面积的98.4%,呈减小趋势的仅为1.6%。(2)植被NPP与气温的相关性不显著,与降水量呈正相关关系。人类活动对植被NPP的影响以正效应为主。(3)榆林西部毛乌素沙地植被NPP的变化以气候变化为主导,对降水量变化的响应更敏感,中东部以人类活动为主导,气候变化和人类活动主导区域分别占榆林市总面积的43.1%和56.9%。榆林西部沙区植被的恢复受制于水资源的供给,中东部退耕还林等人类活动对植被的恢复表现出更为积极的作用。
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)·a^(-1),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.
作者
冯筱
屈建军
丁新辉
田琴
范庆斌
Feng Xiao;Qu Jianjun;Ding Xinhui;Tian Qin;Fan Qingbin(College of Geography and Environment,Xianyang Normal University,Xianyang 712000,Shaanxi,China;College of Urban and Environmental Sciences,Northwest University,Xi'an 710100,China;Northwest Institute of Eco-Environ-ment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《中国沙漠》
CSCD
北大核心
2024年第1期22-32,共11页
Journal of Desert Research
基金
陕西省自然科学基础研究计划项目(2022JQ-176)
国家自然科学基金青年科学基金项目(42201080)。
