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土壤有机碳是陆地碳库的重要组成部分,土地利用/覆被变化及土地管理通过影响土壤有机碳储量、组分、时空分布,进而影响全球碳循环和全球气候变化,是当前的研究热点。土地利用变化对土壤有机碳影响的研究已有很多,但基于文献计量视角的分析报道较少。以Web of Science数据库和CNKI数据库为数据源,通过文献计量学方法和Citespace软件平台,分析了1991~2014年土地利用变化与管理对土壤有机碳影响的研究进展及热点。研究表明:森林、草地、农田等土地利用类型及土地利用变化与管理对土壤有机碳的影响是研究的重点;森林、草地生态系统主要通过土地利用变化(林地转化为次生林、草地、耕地;草地过渡放牧或转化为耕地)影响土壤有机碳变化;农田主要通过土地管理(退耕还林还草、耕作方式、施肥等)来影响土壤有机碳变化;土壤有机碳变化研究选取的指标越来越具体化,模型多样化,但土壤有机碳模型研究还未成体系,土壤有机碳变化趋势预测是未来研究的重点。
Soil organic carbon is an important part of terrestrial carbon pools. Land use / cover change and land management are the current research hotspots by affecting soil organic carbon storage, composition and spatial and temporal distribution, and thus affecting the global carbon cycle and global climate change. There are many researches on the impact of land use change on soil organic carbon, but there are few reports based on bibliometric analysis. Taking Web of Science database and CNKI database as data sources, this paper analyzes the research progress and hot spots of the impact of land use change and management on soil organic carbon from 1991 to 2014 through bibliometrics and Citespace software platform. The results show that: the forest land, grassland, farmland and other types of land use and the impact of land use change and management on soil organic carbon are the focus of study; forest and grassland ecosystem mainly through land use change (forest land conversion to secondary forest, grassland, Transitional grazing or conversion to arable land) affect soil organic carbon change; farmland mainly affects soil organic carbon change through land management (returning farmland to forest and grassland, tillage, fertilization, etc.); indexes selected by the research on soil organic carbon change more and more specifically However, the study of soil organic carbon model is not yet a complete system. The prediction of the trend of soil organic carbon is the focus of future research.