中国草地退化研究热点区域的提取及其时空动态变化（英文）

Extraction and Dynamic Spatial-Temporal Changes of Grassland Deterioration Research Hot Regions in China

运用网络爬虫技术,检索了中国期刊网1950s^2016年全部期刊论文全文,对其中293368篇草地退化研究论文的摘要开展中文分词、地名匹配,构造了基于综合研究热度指数的中国草地退化研究热点区域提取模型,由此分析了中国草地退化研究热点区域的空间分布格局和动态变化过程。研究表明:(1)基于综合研究热度指数的模型可以较好地表现我国草地退化研究热点区域的空间分布格局。(2)中国草地退化研究热点区域主要分布在内蒙古、新疆、青海、西藏、甘肃等省区的大部地区,内蒙古东北部(呼伦贝尔)、中东部(锡林郭勒、赤峰、乌兰察布)地区是草地退化研究的显著热点区。(3)1950年代以来,全国具有强度及以上等级草地退化研究热度值的县域从81个发展到99个,区域总面积从103.8万平方公里上升到114.6万平方公里。197个县域草地退化研究热度呈现上升态势。论文还对草地退化研究热点区域与草地退化区的关系了讨论,指出在两者在时间匹配、空间匹配和概念匹配上等方面存在差异。

The authors use a web crawler to retrieve all periodical articles from CNKI between the 1950 s and 2016 and then parse the abstracts of 293368 articles about grassland deterioration by word segmentation, location matching and other methods. The authors also construct a research hot regions extraction model of grassland deterioration in China based on a comprehensive research hot regions index of toponyms and then analyze the spatial pattern and dynamic change in research hot regions of grassland deterioration in China. The research shows the following：（1） The spatial heterogeneity of grassland deterioration in China can be effectively described by a model of grassland deterioration based on the comprehensive research hot regions index.（2） The research hot regions of grassland deterioration are mainly distributed in most regions of Inner Mongolia, Xinjiang, Qinghai, Tibet, Gansu and other provinces. The northeastern region of Inner Mongolia（such as Hulunbeier） and the eastern region of Inner Mongolia（such as Xilin Gol, Chifeng and Wulanchabu） are significant hot regions in the study of grassland deterioration.（3） The number of high research hot regions increases from 81 in the 1950 s to 99 in the 2000s; the area increases from 1.038 million km2 to 1.146 million km2. The degree of hot for grassland deterioration research in 197 counties showed an upward trend. This paper also discusses the relationship between the region of research hot regions and the region of grassland deterioration and then indicates the differences between them in time matching, space matching and concept matching.