摘要
生态工程背景下的碳储量空间格局变化及其影响因素识别是当前研究的焦点和前沿议题.华北干旱半干旱区作为退耕还林(草)工程成效显著区域,其碳储量动态变化与影响因素对促进碳汇以实现可持续发展具有重大意义.本研究通过修正碳密度数据,利用InVEST模型,估算了华北干旱半干旱区2000−2020年碳储量并分析了其时空变化特征,同时利用地理探测器定量探讨了影响碳储量变化的因素.结果表明:①2000−2020年华北干旱半干旱区土地利用类型的改变主要体现在耕地、未利用地和水域的减少以及林地、灌木、草地和建设用地的增加,林地和草地面积占比之和由52.94%增至54.47%,建设用地面积增幅最大,达60.59%.②华北干旱半干旱区2000年、2005年、2010年、2015年、2020年总碳储量分别为7542.46 Tg、7570.94 Tg、7733.11 Tg、7909.20 Tg、8210.84 Tg,平均变化速率为33.501 Tg/a,21年间累计增加668.38 Tg.③碳储量稳定区域的面积占92.39%;碳储量增加区域面积占5.17%,主要分布于河流沿岸的绿洲地区及山地林区,与林地、草地转入区域存在一定重叠;碳储量减少区域面积占2.45%,主要位于乌兰布和沙漠中草地-未利用地交界处以及河北省居民用地.④植被覆盖度是影响华北干旱半干旱区碳汇的首要因素,其次为年均降水量和累计造林面积.不同因子交互作用后会增强单因子对碳汇空间分异的解释力,表明区域内碳汇受到多种因素共同影响.研究显示,华北干旱半干旱区生态修复工程成效显著,碳储量持续增加,其碳汇能力主要受限于自然因素,但生态工程等积极人为措施也能显著提升碳汇.
The changes in the spatial pattern of carbon storage and the identification of influencing factors under ecological engineering are core and cutting-edge issues in current research.As a region where the Grain for Green project has achieved significant results,the dynamic changes in carbon stock and its influencing factors in the arid and semi-arid region of North China will make important contributions to promoting carbon sequestration and sustainable development.This study corrected carbon density data and used the InVEST model to estimate carbon storage in the arid and semi-arid region of North China.In addition,the factors affecting the carbon stock changes were quantitatively explored by Geodetector.The results show that:(1)The changes in land use types in the arid and semi�arid region of North China from 2000 to 2020 are mainly reflected in the decrease of cultivated land,unutilized land and watersheds,and the increase of forest land,shrubs,grassland and construction land,of which the area of forest land and grassland increased from 52.94%to 54.47%,while the area of construction land increased the largest,reaching 60.59%.(2)The total carbon storage in the study region in 2000,2005,2010,2015,and 2020 were 7542.46 Tg,7570.94 Tg,7733.11 Tg,7909.20 Tg and 8210.84 Tg,respectively,with an annual increase rate of 33.501 Tg/a,and a cumulative increase of 668.38 Tg over 21 years.(3)The area of stable carbon storage accounts for 92.39%.The area of increasing carbon storage accounts for 5.17%,mainly distributed in riverbanks and forest rejoins,overlapping with conversion areas of vegetable rejoins and others;the area of decreasing carbon storage accounts for 2.45%,mainly located at the junction of grassland and unused land in the WuLanBuHe Desert and residential land in Hebei Province.(4)Vegetation coverage emerged as the primary factor affecting carbon sinks in arid and semi-arid region of North China,followed by average annual precipitation and cumulative afforestation area.The interaction among different factors e
作者
黄艳
刘晓曼
袁静芳
付卓
乔青
HUANG Yan;LIU Xiaoman;YUAN Jingfang;FU Zhuo;QIAO Qing(Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Satellite Application Center for Ecology and Environment,Beijing 100094,China;Nanjing Institute of Environmental Sciences,Nanjing 210042,China;Beijing Municipa Research Institute of Eco-Environmental Protection,Beijing 100037,China)
出处
《环境科学研究》
CAS
CSCD
北大核心
2024年第4期849-861,共13页
Research of Environmental Sciences
基金
国家重点研发计划项目(No.2022YFF1303403)。
关键词
陆地生态系统碳储量
InVEST模型
地理探测器
华北干旱半干旱区
carbon storage in terrestrial ecosystems
InVEST model
geographic detector
arid and semi-arid region of North China
