Abstract
Rocky desertification is an important type of ecological degradation in southwest of China. The author uses the web crawler technology and obtained 9345 journal papers related to rocky desertification from 1950s to 2016 in China. The authors also constructed a technological process to extract research hot regions on rocky desertification and then a spatial distribution map of research hot regions on rocky desertification was formed. Finally, the authors compared the spatial distribution using the sensitivity map of rocky desertification to find the differences between two maps. The study shows that: (1) rocky desertification research hot regions in China are mainly distributed in Guizhou, Yunnan and Guangxi, especially in Bijie, Liupanshui, Guiyang, Anshun, Qianxinan Autonomous Prefecture, QianNan Autonomous Prefecture, Qiandongnan Autonomous Prefecture in Guizhou Province, Hechi, Baise, Nanning, Guilin in Guangxi Zhuang Autonomous Region and Zhaotong in Yunnan Province. (2) The research hot regions on rocky desertification have good spatial consistency with the sensitivity regions of rocky desertification. At the prefecture level, the overlap rate of the two regions reached 85%. Because of the influence of topography, vegetation coverage, population distribution, traffic accessibility and other factors, there were regions that consisted of combinations of high sensitivity but low research popularity regarding rocky desertification; these sites included Qionglai Mountain-Liangshan Area of Sichuan, Wushan-Shennongjia Area of Hubei, Hengduan Mountain Area of western Yunnan and Dupangling Area of southern Hunan. (3) The research hot regions and sensitive regions cannot be matched completely in time, space and concept. Therefore, we can use their spatial distribution differences to improve the pertinence of planning, governance and study of rocky desertification.
Highlights
Rocky desertification refers to a phenomenon of land degradation, which includes the destruction of surface vegetation, serious soil loss, the large-scale deposit of exposed bedrock or gravel; these processes are affected by human activities in tropical and subtropical areas with humid and semi-humid climatic conditions and extremely developed karst environment [1,2]
To ascertain the above problems, in this paper, we propose a method for extracting rocky desertification research hot regions and construct a hot regions spatial distribution database of rocky desertification in China based on the China National Knowledge Infrastructure (CNKI) and the algorithms of keyword searches, Chinese word segmentation, address recognition and toponym matching
In view of the spatial distribution of rocky desertification, this paper studies the information extraction technology of rocky desertification research hot regions based on literature text mining and analyzes the spatial distribution of research hot regions on rocky desertification in China and the applicable scenarios of the analysis methods of research hot regions
Summary
Rocky desertification refers to a phenomenon of land degradation, which includes the destruction of surface vegetation, serious soil loss, the large-scale deposit of exposed bedrock or gravel; these processes are affected by human activities in tropical and subtropical areas with humid and semi-humid climatic conditions and extremely developed karst environment [1,2]. The rocky desertification regions of China are mainly distributed in southwestern China with a wide coverage and a large population of residents; this region represents an ecologically fragile area with the largest karst landform and the most seriously impacted region affected by rocky desertification worldwide [3,4,5]. Sci. 2018, 8, 2075 reduced the level of well-being of the local people [6]. Under the major goals of the central government and the 17 major goals of the United Nations SDG in 2020, it is of great significance to implement targeted ecological control and anti-poverty work in the rocky desertification areas
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