摘要
为阐明近50 a来贵州普定县域生态系统碳储量时空变化规律及土地利用变化对碳储量的影响,基于InVEST模型和ArcGIS技术,借助土地利用转移矩阵,估算分析普定县1973—2020年碳储量及空间分布特征,探讨土地利用变化对碳储量时空分布的影响。结果表明:(1)普定县陆地生态系统1973、1989、2003、2010和2020年碳储量分别为1586.8万、1419.6万、1502.2万、1583.4万和1652.9万t,总体呈增加趋势。(2)普定县东北、西南部碳储量显著增加,中南部明显减少,其中2010—2020碳损失最为显著。(3)旱地、草地、水田和其他林地转为灌木林地,旱地、草地和其他林地转为有林地,以及旱地转为水田等土地利用转移情况是碳储量增加的主要原因。普定县生态系统碳储量整体上升,空间上表现出东北、西南部固碳能力提高,中南部下降。未来应着重关注普定县中南部区的碳储存能力,以提升区域生态系统质量及水土保持功能。
[Background]The carbon cycle and greenhouse effect of terrestrial ecosystem have always been the focus of global change research in geoscience,ecology and environmental sciences.Land use change may reflect human land use patterns in an area and plays an important role in spatial soil and water conservation.Regional land use change is the main reason for the change in ecosystem carbon storage,which affects the carbon source and carbon sink effect.[Methods]This paper took Puding county in central Guizhou as the research area,based on the carbon storage and sequestration module of InVEST model and ArcGIS technology,combined with land use data and carbon density data,the carbon storage and its spatial pattern in Puding county of central Guizhou province from 1973 to 2020 were estimated and analyzed.Based on the land use type carbon storage transfer matrix,the influence of land use changes on the spatial and temporal distribution of carbon storage was explored.[Results](1)The carbon storage of terrestrial ecosystem in Puding county in 1973,1989,2003,2010 and 2020 were 15.868×10^(6) t,14.196×10^(6) t,15.022×10^(6) t,15.834×10^(6) t and 16.529×106 t,respectively,and the carbon storages of ecosystems decreased first and then increased,with an overall trend of increase and a cumulative increase of 661000 t,indicating that the ecological restoration project in Puding county has achieved remarkable results and the ecosystem service functions had been significantly improved.(2)The spatial distribution showed a significant increase in the northeast and southwest of Puding county,and a significant decrease in the south-central Puding county.The northeast and southwest of the Puding county maintained a stable trend of increasing carbon storage year by year from 1989 to 2020,while the carbon loss in the middle-south of Puding county was significant from^(2)010 to 2020,and the highest value areas of carbon storage were distributed in the southwest and northeast of Puding county.(3)Dry land,grassland,paddy field and other woodland were converted into shrubland.Dry land,grassland and other woodland into forest land,and the conversion of dry land to paddy field were the main reasons for the increase of carbon storage in the ecosystem of Puding county and sustainable ecological development,indicating that the increase of shrubland,forest land and paddy field in Puding county is beneficial to carbon sink.[Conclusions]The overall carbon reserves of the ecosystem in Puding county have increased,showing the increasing carbon sequestration capacity in the northeast and southwest of Puding county and the decreasing carbon sequestration capacity in the central and southern region of Puding county.In the future,the carbon storage capacity in the south-central Puding county should be emphasized to improve the regional ecosystem quality and soil and water conservation function.
作者
李月
罗红芬
LI Yue;LUO Hongfen(College of Public Management,Guizhou University of Finance and Economics,550025,Guiyang,China)
出处
《中国水土保持科学》
CSCD
北大核心
2023年第4期28-35,共8页
Science of Soil and Water Conservation
基金
国家自然科学基金“山区乡村产业振兴进程中耕地和宅基地转型耦合机制与调控研究:以贵州为例”(42261044)
贵州省教育厅青年科技人才成长项目“喀斯特地区典型小流域生态治理措施的生态服务功能评价研究”(黔教合KY字[2022]202号)
2022年度贵州省水利科技项目“双碳背景下喀斯特流域生态文明高质量发展水平研究”(KT202223)。
作者简介
第一作者:李月(1991-),女,博士,副教授。主要研究方向:喀斯特地区土地资源管理与生态修复。E-mail:976438528@qq.com。
