生态学报2023，Vol.43Issue(23)：9794-9804,11.DOI:10.20103/j.stxb.202210233017
1982-2015年黄土高原植被变化特征及归因
Characteristics and driving forces of changes in vegetation coverage on the Loess Plateau,1982-2015
摘要
Abstract
Vegetation coverage on the Loess Plateau plays an important role in reducing soil sediment in the middle and lower reaches of the Yellow River and in sustaining regional ecological functions.Climate change and human activity are two important factors that drive changes in vegetation coverage on the Loess plateau.Previous researchers used statistical methods to describe the linear relationships between vegetation coverage and climate change on the plateau.However,these studies typically ignored the complicated nonlinear relationships between vegetation coverage and climate change;thus,their understanding of the mechanisms behind changes in vegetation coverage was limited.Therefore,in the present paper,the impacts of climate change and human activities on vegetation changes on the Loess Plateau from 1982 to 2015 were quantified and analyzed using a random forest algorithm and the residual threshold method with GIMMS NDVI data.The results showed the following:(1)Vegetation coverage on the Loess Plateau presented an overall increasing trend from 1982 to 2015.Only 54.68％of the total area showed a significant increase in vegetation before 1999,while this area reached 85.11％after 1999;(2)From 1982 to 1998,the monthly temperature,precipitation,and sunshine hours had a significantly positive correlation with vegetation coverage in more than 80％of the total area of the Loess plateau,indicating that vegetation coverage changes before 1999 were mainly caused by climate change.Using a random forest algorithm,the accuracy of a simulation of 99.71％of the area was above 0.5;(3)From 2000 to 2015,the impacts of climate factors and human activities on vegetation coverage were significantly spatially heterogeneous.The positive driving effect of human activities on vegetation coverage increased by 55.94％,while the negative and positive driving effects of climate-related factors decreased by 42.58％and 12.86％,respectively.The driving factors of changes in vegetation cover on the Loess Plateau can be best described by the method proposed in this study,which quantifies the impact of climate change and human activities on vegetation coverage and provides data support for ecological construction on the Loess Plateau.关键词
黄土高原/气候变化/人类活动/植被变化/残差阈值Key words
the Loess Plateau/climate change/human activities/vegetation change/residual threshold引用本文复制引用
燕丹妮,武心悦,王博恒,郝红科..1982-2015年黄土高原植被变化特征及归因[J].生态学报,2023,43(23):9794-9804,11.基金项目
国家重点研发计划项目(2017YFD0600500) （2017YFD0600500）
