近30年来长春市城市扩张对区域土壤有机碳储量的影响

项目名称： 近30年来长春市城市扩张对区域土壤有机碳储量的影响

项目编号： No.41471148

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 任春颖

作者单位： 中国科学院东北地理与农业生态研究所

项目金额： 82万元

中文摘要： 城市扩张使自然或耕作土壤变为城市土壤，这一转变引起的区域土壤碳密度及储量的变化，是碳循环研究中值得关注的前沿问题。然而，评价城市化过程到底是增加还是减少了区域土壤碳库还没有统一的答案，且城市土壤碳基础数据也十分缺乏。因此，本项目以长春市为研究区，集成野外观测实验、遥感反演与地统计学等多种方法，准确估算长春市现状和历史时期土壤有机碳库，揭示其分布格局和动态变化规律，评估近30年来城市扩张过程对区域土壤有机碳库的影响；应用土地利用变化与碳循环机理模型耦合的HILLS模型，模拟城市扩张过程对区域土壤有机碳库的影响，探讨结果是否与研究方法、城市所在区域原生生态系统类型以及土地利用转化时间等因素相关。本研究能够丰富国内区域尺度土壤有机碳储量及其动态的研究成果，减小国家尺度土壤有机碳储量及其动态估算的不确定性；同时可以为全球变化背景下我国重要农业区城市规划与土地利用结构调整提供决策依据。

中文关键词： 景观动态；城市化；土壤有机碳；遥感监测；HILLS模型

英文摘要： With rapid urban sprawl, a large number of natural or cultivated soils have been conversed to urban soil. It is very important to study the impact of urbanization on the change of soil organic carbon density and storage. However, up to now, there has been no exact answer to the question whether such urbanization process decrease or increase the soil carbon density and storage at regional scale. Therefore, it is a big challenge for researchers with lacking of basic database of soil carbon. In this research, taking Changchun city as the typical study area, integrating field monitoring, remote sensing, GIS spatial analysis and geostatistics techniques, soil organic carbon (SOC)storage in 1985 and 2015 can be assessed exactly, spatial pattern and dynamics change of SOC density and storage can be explored, and the influence of urban expansion on SOC can be evaluated in recent 30 years. Furthermore, HILLS model system would be applied, coupled land use change and SOC cycling mechanism model, to simulate the impact of urbanization on SOC density and storage. Finally, we would discuss the correlation between the result and the methods, ecosystem types and the period of land use change. The study not only can boost the results concerning storage and dynamics change of SOC in China, decrease the uncertainty of estimation of SOC at country level,but also would provide scientific foundation for the urban planning and structure modification of land use in the important agricultural region at the background of global change.

英文关键词： landscape dynamics;urbanization;soil organic carbon;remote sensing monitoring;HILLS model