基于图谱可视化的中国大气氮沉降研究态势分析

目的]系统地探究近10a中国大气氮沉降研究态势,为今后的相关研究提供科学借鉴。方法]基于科学计量学与信息可视化分析方法,借助Citespace软件,从文献中分析近10a中国大气氮沉降研究热点及趋势。结果]近10a来,在氮沉降背景下,森林生态系统中凋落物分解与土壤微生物特征一直是研究热点;近5a草地生态系统的研究地区更加广泛,但较少涉及林下草地;碳氮循环相关研究多集中于温带及亚热带森林区,研究内容更加丰富,研究方法向大数据分析及模型建立方向发展;大气氮沉降通量观测以水域生态系统为主,近5a来较多地结合了非点源污染及示踪技术。结论]近10a来,中国氮沉降领域各学科交叉性和系统性增强,研究内容和尺度不断扩大,研究方法和技术趋于多样化;草地生态系统及微生物群落特征、氮沉降与全球变化及人类活动耦合关系研究成为近年来关注的热点。

Research Trends Analysis of Atmospheric Nitrogen Deposition in China Based on Mapping Visualization

Objective] Systematical study the research trends of atmospheric nitrogen deposition in last decade in China, in order to provide reference basis for relevant research.Methods] The scientific metrology and information technology were used to visualize the patterns and trends of atmospheric nitrogen deposition in last decade in scientific literature by Citespace software.Results] In the last decade, the effect of nitrogen deposition in forest ecosystem has been focused on the subjects of litter decomposition and soil microbial properties. Researches on the response of grass ecosystem to nitrogen deposition got increase significantly during 2005-2010. Regarding to the research of different ecosystems or sub-ecosystems, grass glade was not attracted as much attention as grassland. In addition, processes of carbon and nitrogen cycles were concentrated on the temperate zone and subtropical zone, and the research content becomes more abundant at present, and the methods are expected to promote the developments of big data analysis and modelling. In respect of the observation of nitrogen deposition flux, most studies referred to aquatic ecosystems. Moreover, nitrogen deposition flux with non-point source pollution got more attention due to the environmental degradation and the development of research methods.Conclusion] The interdisciplinary and systematicness of atmosphere nitrogen deposition in China were getting enhanced gradually. And the research contents and scale were gradually getting associated and widened. Grass ecosystem, characteristic of microbial community and coupling relationship among nitrogen deposition, global climate change and human activities had attracted more attention in the last decade.