
2012—2021年国内外古树研究领域态势分析——基于CiteSpace和VOSviewer
Analysis of the Research Situation of Ancient Trees at Home and Abroad from 2012 to 2021:Based on CiteSpace and VOSviewer
为对国内外古树研究现状进行全面、深入的分析,探究该领域的研究前沿和研究热点,以2012—2021年间CNKI中文期刊数据库、Web of Science核心数据集中收录的该领域相关研究文献作为数据基础,充分整合CiteSpace和VOSviewer文献计量可视化软件的优势,采用综合的文献共著网络、共被引网络以及共词网络进行科学知识图谱的可视化分析方法。研究发现,国内外研究者们对古树的关注程度总体呈逐年上升趋势。在国内,主要研究机构包括上海市绿化管理指导站、太原市园林植物研究中心等,国内主要研究内容涉及4个方面,分别是古树资源调查、古树保护措施、土壤对古树生长的影响以及古树生态特征分析。国际上,最有影响力的国家是美国,排名第2位的是中国。在国际研究机构中,影响力最大的研究机构是中国科学院。Yang Y等为该领域高影响力作者。国际古树主要研究内容涉及4个方面,分别是古树生物文化遗产价值、古树广泛的生态价值、古树在区域生物多样性保护方面的价值,以及古树独特的遗传多样性优势。
In order to conduct a comprehensive and in-depth analysis of the research status of ancient trees at home and abroad, and identify the hotspots and frontiers of ancient trees during 2012 and 2021, this paper took the relevant research literature as the data foundation, which was included in the CNKI database and the core collection of Web of Science. This paper fully integrated the advantages of CiteSpace and VOSviewer visualization software, and used comprehensive literature co-author network, co-citation network and co-word network to carry out the visualization analysis of scientific knowledge map. This paper found that the attention of researchers at home and abroad on ancient trees was on the rise year by year. In China, the main research institutions included Shanghai Green Management Guidance Station, Taiyuan Garden Plant Research Center, etc. The main domestic research contents involved four aspects, respectively: investigation of ancient tree resources, ancient tree protection measures, the soil impact on ancient tree growth and analysis of ancient tree ecological characteristics. Internationally, the most influential research country was the United States, and the second was China. Among the international research institutions, the most influential research institution was the Chinese Academy of Sciences, and Yang Y, et al. were highly influential authors in this field. The main research contents of international ancient trees involved four aspects, namely: the biological and cultural heritage value of ancient trees, the extensive ecological value of ancient trees, the value of ancient trees in the protection of regional biodiversity, and the unique advantages of ancient trees in genetic diversity.
古树 / 态势分析 / 科学知识图谱 / CiteSpace / VOSviewer {{custom_keyword}} /
ancient trees / situation analysis / scientific knowledge map / CiteSpace / VOSviewer {{custom_keyword}} /
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Large old trees are keystone ecological structures that provide vital ecosystem services to humans. However, there are few large-scale empirical studies on patterns of diversity and density of large old trees in human-dominated landscapes. We present the results of the first nationwide study in China to investigate the patterns of diversity and density of large old trees in human-dominated landscapes. We collated data on 682,730 large trees >= 100 years old from 198 Chinese regions to quantify tree species diversity, tree density and maximum tree age patterns. We modelled the effects of natural environmental variables (e.g. climate and topography) and anthropogenic variables (e.g. human population density and city age) on these measures. We found a low density of large old trees across study regions (0.36 trees/km(2)), and large variation in species richness among regions (ranging from 1 to 232 species). More than 95% of trees were <500 years old. The best fit models showed that: (1) Species diversity (species richness adjusted by region size) was positively associated with mean annual rainfall and city age; (2) Density of clustered trees, which are mostly remnants of ancient woods, was negatively influenced by human population density and rural population (% of total population). In contrast, the density of scattered trees, which are mostly managed by local people, was positively correlated with mean annual rainfall and human population density. To better protect large old trees in cities and other highly-populated areas, conservation policy should protect ancient wood remnants, mitigate the effects environmental change (e.g. habitat fragmentation), minimize the negative effects of human activities (e.g. logging), and mobilize citizens to participate in conservation activities (e.g. watering trees during droughts). (C) 2018 Elsevier B.V.
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