城市扩张对土地碳储量的影响及其梯度效应——以南京市为例  

Impact of Urban Expansion on Land Carbon Storage and Its Gradient Effect:A Case Study of Nanjing City

作　　者：李靖业 梁羽洁 杨桂山[2,3] 苏浩 杨建新 LI Jingye;LIANG Yujie;YANG Guishan;SU Hao;YANG Jianxin(School of Public Administration,Hohai University,Nanjing 211100,China;Nanjing Institute of Geography and limnology,Chinese Academy of Sciences,Nanjing 211135,China;College of Geography and Remote Sensing,Hohai University,Nanjing 211100,China;School of International Affairs and Public Administration,Ocean University of China,Qingdao 266100,China;School of Public Administration,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]河海大学公共管理学院,江苏南京211100 [2]中国科学院南京地理与湖泊研究所,江苏南京211135 [3]河海大学地理与遥感学院,江苏南京211100 [4]中国海洋大学国际事务与公共管理学院,山东青岛266100 [5]中国地质大学(武汉)公共管理学院,湖北武汉430074

出　　处：《中国土地科学》2025年第3期45-57,共13页China Land Science

基　　金：教育部人文社科基金项目(24YJC630102);中央高校基本科研业务费专项资金资助(B240207085);国家社会科学基金重大项目(23&ZD141)。

摘　　要：研究目的:以南京市为研究区,从城乡梯度方向探讨城市扩张对土地碳储量变化的影响及梯度效应,为优化城乡空间布局,增强土地系统“碳汇”提供借鉴。研究方法:InVEST模型,PLUS模型,GTWR模型等。研究结果:4(1)2000—2020年南京市土地碳储量逐年减少,损耗量共计262.18×10 t,建设用地占用耕地对碳储量影响最为显著。(2)2000—2020年,核心区与近城区因建设用地扩张导致碳损最显著,远城区及城乡交界处生态用地的开发对土地碳储量影响较大。(3)2030年粮食安全情景下碳损最小,而城镇扩张情景碳储量损失最大,生态保育情景则在一定程度上降低了城市扩张对碳储量的负面影响,但仍无法完全抵消碳损失。研究结论:城市扩张模式及城乡梯度特征对碳储量变化存在显著影响,不同情景下的碳储量变化呈现明显的空间分异。本文创新性地构建城乡梯度碳储量分析框架,可揭示城市扩张对碳储量影响的空间异质性,为优化国土空间布局提供科学依据。The purposes of this study are to explore the impact of urban expansion on changes in land carbon storage and its gradient effects along the urban-rural gradient,to provide the insights for optimizing urban-rural spatial layout and enhancing the“carbon sink”capacity of land systems.The research methods include InVEST model,PLUS model,GTWR model,etc.The research results show that:1)from 2000 to 2020,land carbon storage in Nanjing City decreased 4 annually,with a total loss of 262.18×10 t.The conversion of cultivated land to construction land had the most significant impact on carbon storage.2)Between 2000 and 2020,the expansion of construction land in the core area and peri-urban areas induced the most significant carbon loss,and the development of ecological land in the remote urban area and at the junction between urban and rural areas had a greater impact on land carbon storage.3)In 2030,the food security scenario will have the smallest carbon loss,while the urban expansion scenario will have the largest carbon storage loss.The ecological conservation scenario can reduce the negative impact of urban expansion on carbon storage to some extent,but it still cannot completely offset the carbon loss.In conclusion,the pattern of urban expansion and the gradient characteristics of urban and rural areas have significant effects on the changes of carbon storage,the changes of which under different scenarios show obvious spatial differentiation.This study innovatively constructed an urban-rural gradient carbon storage analysis framework,which can reveal the spatial heterogeneity of the impact of urban expansion on carbon storage,and provide a scientific basis for optimizing the territorial space layout.

关 键 词：城市扩张 碳储量 梯度效应 InVEST模型 PLUS模型 GTWR模型 南京市 

分 类 号：F301.2[经济管理—产业经济]