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基于投影寻踪法的长株潭城市群地区耕地集约利用评价 被引量:73

Evaluation of intensive cultivated land use based on a projection pursuit model in Changsha-Zhuzhou-Xiangtan urban agglomeration
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摘要 为克服现有耕地集约利用评价中存在权重设置主观性强、高维数据不易处理等不足,在构建耕地集约利用评价指标体系的基础上,以长株潭城市群地区1996-2009年各年度和2009年各县(县级市、市辖区)为数据样本,采用基于遗传算法的投影寻踪模型对长株潭城市群地区耕地集约利用时序变化和空间分异进行定量综合评价。结果表明:①复种指数、单位耕地面积化肥施用量、单位耕地面积农业机械总动力、单位耕地面积种植业产值已成为长株潭城市群地区耕地集约利用的主要影响因素;②1996-2009年,长株潭城市群地区耕地集约利用程度以2002年为分界点呈现出"平稳—快速增长"的阶段性发展态势;③2009年,长株潭城市群地区耕地集约利用程度表现为由近郊区向中郊区、再向远郊区梯度式降低的空间分异特征;④与常规评价方法相比,投影寻踪法客观可靠,信息表征丰富,结果合理,在耕地集约利用评价方面具有有效性。 To avoid the subjectivity and difficulty of dealing with high dimensional dataset for conventional methods, a set of evaluation index system of cultivated land intensive use was built. Based on data of land and socioeconomy from 1996 to 2009 in Changsha-Zhuzhou-Xiangtan (Chang-Zhu-Tan) urban agglomeration and in 2009 in each county, quantitative comprehensive evaluation of sequential variation and spatial differentiation was made by a projection pursuit model based on genetic algorithm. The results were obtained as follows. (1) The main factors affecting cultivated land intensive use were multiple-crop index, application quantity of chemical fertilizer, total power of agricultural machinery and plant production for per unit cultivated land area in Chang-Zhu-Tan urban agglomeration. (2) From 1996 to 2009, the degree of cultivated land intensive use in Chang-Zhu-Tan urban agglomeration took the year 2002 as the demarcation point, and presented a phased development trend with "stable-rapid growth". (3) In 2009, spatial differentiation characteristic of the degree of cultivated land intensive use declined gradually from suburbs to middle suburbs and outer suburbs in Chang-Zhu-Tan urban agglomeration; (4) Compared with conventional evaluation methods, the projection pursuit method was of impersonality and credibility, abundance in characterization information, with reasonable results and high validity in evaluation of cultivated land intensive use.
出处 《地理研究》 CSSCI CSCD 北大核心 2013年第11期2000-2008,共9页 Geographical Research
基金 教育部人文社会科学研究青年基金项目(12YJC630032) 湖南省软科学研究计划项目(2009ZK3165) 湖南省国土资源科技计划项目(2010-17) 湖南省自然科学基金项目(11JJ3043 11JJ2012) 湖南省国土资源科技项目(2013-24) 湖南师范大学青年优秀人才培养计划(ET13106)
关键词 耕地 集约利用 评价 投影寻踪 长株潭城市群 cultivated land intensive use evaluation projection pursuit Changsha-Zhuzhou-Xiangtan urban agglomeration
作者简介 邓楚雄(1974-),男,湖南衡阳人,博士,副教授,主要研究方向为资源评价与区域规划。E—mail:dcxppd@163.com 通讯作者:谢炳庚(1961-),男,湖南长沙人,教授,博士生导师,主要研究方向为国土资源评价与管理。E-mail:xbgyb@sina.com
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