长江三角洲城市群建设用地扩张和耕地保护对陆地生态系统碳汇的影响研究  

Effects of Built-up Land Expansion and Farmland Protection on Carbon Sinks of Terrestrial Ecosystems in the Yangtze River Delta Urban Agglomeration

作　　者：王迎英 张刘臻 甄延临 张从果 董佳琦 卢学鹤 张秀英[2] WANG Yingying;ZHANG Liuzhen;ZHEN Yanlin;ZHANG Congguo;DONG Jiaqi;LU Xuehe;ZHANG Xiuying(Jiaxing Land Space Planning Research Co.,Ltd.,Jiaxing 314000;International Institute for Earth System Science,Nanjing University,Nanjing 210023;Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,Nanjing 210023;Spatial Planning Center,Yangtze Delta Region Institute of Tsinghua University,Zhejiang,Jiaxing 314000;School of Geography Science and Geomatics Engineering,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]嘉兴市国土空间规划研究有限公司,浙江嘉兴314000 [2]南京大学国际地球系统科学研究所,江苏南京210023 [3]江苏地理信息资源开发与应用协同创新中心,江苏南京210023 [4]浙江清华长三角研究院空间规划院(中心),浙江嘉兴314000 [5]苏州科技大学地理科学与测绘工程学院,江苏苏州215009

出　　处：《地理与地理信息科学》2024年第5期35-41,共7页Geography and Geo-Information Science

基　　金：江苏省自然科学基金面上项目(BK20211156);国家自然科学基金面上项目(42371378)。

摘　　要：基于DNDC(DeNitrification-DeComposition)和IBIS(Integrated Biosphere Simulator)模型模拟农田、林地、草地生态系统的温室气体排放量和碳汇通量,进而评估2000-2020年长江三角洲城市群建设用地扩张和新增耕地对陆地生态系统碳汇的影响。结果表明:①2020年长江三角洲城市群林地、草地和农田生态系统均承担碳汇功能,总碳汇平均值为4439.56±3257.83 kg C hm^(-2)·a^(-1),呈现北高南低的空间分布特征;②2000-2020年长江三角洲城市群新增建设用地13702.09 km^(2),引起陆地生态系统碳汇损失8.21 Tg C,若不考虑碳汇的空间异质性,则碳汇损失7.87 Tg C;③2000-2020年长江三角洲城市群新增耕地1236.58 km^(2)(27.42%和25.85%转入源分别为林地和草地),导致碳汇增加0.28 Tg C;④长江三角洲城市群农田生态系统具有较高的固碳能力且其碳汇具有较强的空间异质性,耕地保护政策降低了建设用地扩张引起的碳汇损失。Based on the models of DNDC(DeNitrification-DeComposition)and IBIS(Integrated Biosphere Simulator),this paper estimated the greenhousegas emission and carbon sink fluxes in the forest,grassland,farmland ecosystems,and then evaluated the influences of built-up land expansion and farmland protection policies on the carbon sinks in the Yangtze River Delta urban agglomeration from 2000 to 2020.It is found as follows.①In 2020,the terrestrial ecosystems in the Yangtze River Delta urban agglomeration bear the carbon sink function,and the average carbon sink is 4439.56±3257.83 kg C hm^(-2)·a^(-1),showing the spatial distribution characteristics of high in the north and low in the south.②The built-up land expanded 13702.09 km 2 from 2000 to 2020,resulted in 8.21 Tg C carbon loss of the terrestrial ecosystems.If the spatial heterogeneity of carbon sinks is not considered,the carbon loss would be 7.87 Tg C.③From 2000 to 2020,the increased farmland was 1236.58 km 2,among which 27.42% and 25.85% were transferred from forest and grassland.The increased farmland enhanced carbon sink by 0.28 Tg C.④The farmland ecosystem in the Yangtze River Delta urban agglomeration has high carbon sequestration capacity and its carbon sink has strong spatial heterogeneity.The farmland protection polices decrease the loss of carbon sink caused by built-up land expansion.

关 键 词：陆地生态系统碳汇 建设用地扩张 耕地保护 长江三角洲城市群 

分 类 号：F301.2[经济管理—产业经济]