基于信息熵和模糊物元模型的城乡结合部农地质量评价——以湖北省荆州市为例--《资源科学》2008年06期

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dH3M J1JL%~9mQ0基于信息熵和模糊物元模型的城乡结合部农地质量评价——以湖北省荆州市为例水利论文G7w]q!s/]7|c

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【摘要】:城乡结合部是城市与农村相互结合的特殊经济地理单元,是城市快速扩张的重点区域。目前城乡结合部范围不明确,确定方法以定性为主,土地评价偏重土壤质量。针对此点,文章以信息熵理论为基础,通过遥感解译TM影像获取研究区土地利用类型图后,构建土地利用信息熵模型,计算500m×500m网格单元的熵值后借助突变点检测法确定城乡结合部内外边界,内外突变点位熵值为30;然后确定农地质量评价指标体系,通过叠置法和多边形法相结合来获取评价单元及其属性数据,借助地理信息系统(GIS)和模糊物元贴近度聚类分析模型计算评价单元贴近度,划分研究区农地质量等级,并采用野外调查和相关系数法检验结果。结果表明:研究区农地质量中等偏上,以二级,三级为主,占评价总面积的73.35%;尽管受多因素及RS栅格数据特点的影响,城乡结合部带有锯齿状和犬牙交错,但本研究结合了行政界线完整性的原则,划分方法科学、适用,其结果为荆州市确定城市扩展方向、合理利用城乡结合部土地资源提供了重要参考依据,同时也能够为类似地区城市扩展方向的确定提供一种较好的思路。

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7eD*KnL?,lx0【作者单位】:

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M s3qQ o'nw4_3QA(X0华中师范大学城市与环境科学学院 华中师范大学城市与环境科学学院 国家农业信息化工程技术研究中心 华中师范大学城市与环境科学学院

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V9D*rj;gp0信息熵 模糊物元贴近度聚类 城乡结合部 农地质量

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j2V$s\K6`7o%]-J I0【基金】:国家自然科学基金:“可持续耕地分等定级模型、方法与信息系统集成”(编号:40671078)

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lntLVd0湖北省科技攻关计划:“湖北省土地利用/覆盖变化及环境效应研究”(编号:2007AA401B13)

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【分类号】:F301

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【正文快照】:

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近年来,随着经济的迅猛发展和城市化进程的加快,城市不断地向近域推进和向广域扩展,反映到地域结构上,城市和农村土地相互融合,形成了一个性质不同于城市又异于农村的过渡地带,即城乡结合部[1~3]。作为一种特殊而开放的生态系统,城乡结合部土地利用的结构、功能和质量均表现

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