两型社会建设背景下长株潭城市群耕地安全性评价

耕地是一种具有经济、生态和社会价值的重要资源,它的数量、质量和生态状况关乎一个地区资源节约和环境友好型社会的建设。作者运用长株潭城市群耕地利用历史数据,采取层次分析、障碍度分析等研究方法,以两型社会建设理论为依据,在定性描述耕地资源安全内涵的基础上,从资源节约、环境友好两个方面构建评价指标体系,对长株潭城市群耕地资源安全状况进行了评价和障碍度诊断。研究的主要结论是:(1)耕地资源安全具有系统性特征,其内涵涵盖数量安全、质量安全和生态安全,并成为一个有机整体;(2)研究区耕地安全总体及数量、质量和生态状况差异显著,1990—2007年间长株潭城市群耕地安全的总体状况趋于变坏,安全评估得分值从1990年的2.125降到2007年的0.158,表明该地区耕地资源安全存在制约因素;(3)通过障碍因素分析发现,研究区不同时段障碍因素不同,1990—1995年,耕地安全的障碍因素是城市化和经济的过快发展;1996—2002年,障碍因子则转变为地均粮食单产、地均经济产出等过低,而2003—2007年,则表现为环境污染排放等耕地的生态压力因素加大。

An Analysis on the Security of Cultivated Land Resources in Chang-Zhu-Tan City Cluster Based on Two-Oriented Society

Cultivated land is an important natural resource.it plays an important role in promoting urbanization and industrialization of chang-zhu-tan city cluster（CZT）,cultiviland resources security has become a necessary choice and a breakthrough path to a two-oriented society（a resource conserving and environment friendly society）.With an evaluation index system has been set up to research the security of regional cultivated land resource from aspects such as resource conservation and friendly environment.At the same time,qualitatively describing the security of cultivated land resources,this article has systematically proposed the technical system and AHP and diagnosis of obstacles research method about the security of regional cultivated land resource.the conclusions are as follows：（1） cultivated land resources security includes quantity security,quality security,and ecological security,which are integrated as a cultivated resources security system;（2）the security trend of cultivated land resources security varies in overall,quantity,quality and ecology aspect,the cultivated land resources security level of Chang-Zhu-Tan city cluster has wholly been declining from 1990-2007,which means that the overall situation of cultivated land resources security in Chang-Zhu-Tan was worrisome;（3） the obstacle factors influencing the security are different in the research period：at the beginning of the period is improper economic development,population increase and urbanization level etc,the influent factors of middle stage are low farmer per captia net income and per capita cultivated land output,and the factors of last phase are excess pollutants emissions ect.