江苏省农用地质量空间格局及其影响因素分析

Spatial Pattern of Agricultural Land Resources Quality and Influence Factors in Jiangsu Province

本文从农用地资源的质量出发,应用地统计学分析、景观生态学等方法,对江苏省农用地资源质量的空间分布规律进行研究:从江苏省农用地资源自然质量、利用质量、经济质量空间分布,以及不同农业区农用地资源质量的多样性、均匀度、集中度、优势度等分布特点来看,不同农业区的农用地资源质量的区域分异明显,表现出由南向北、由东向西两个方向上的递变规律。文章最后探讨了农用地资源质量空间格局的影响因素,分析结果表明,农用地资源质量空间格局主要受到地带性因素以及大尺度的非地带性因素如大地貌单元等要素的控制,同时还受到人类活动如区位条件、管理水平等因素的干扰,人类活动干扰的区域分异显著。农用地资源质量的空间分布与组合格局是不同层次、多因素综合作用和相互嵌套、相互影响的结果,这对进一步研究农用地资源质量空间分布格局的成因机制具有一定的启示意义。

Since the 1980s, the rapid population growth and economic development have put much more pressures on the limited land resources. This has brought about land quality degradation to some degree and great importance has been attached to the land quality research by numerous researchers. The study of land quality has been the frontier and hotspot in global research field and will be great meaningful to thoroughly understand spatial change and development of multi-scale land quality for management and improvement of land quality. The research of agricultural land classification in Jiangsu Province was completed in 2002 and database of agricultural land classification was established. Based on the database we studied the spatial distribution of agricultural land resources quality in Jiangsu Province through methods of Geo-statistics and Landscape Ecology Analysis. By evaluating the distribution of agricultural land quality in terms of physical attribute, utilization and economic benefits as well as the diversity, centrality, superiority and equality of agricultural land quality, we found that the differences of agricultural land resources quality in different agricultural region are significant. There is a decreasing tendency for agricultural land resource quality from south to north and an increasing trend from east to west. And we have also discussed the factors affecting spatial pattern of agricultural land resources quality. The result showed that the spatial distribution of land quality are mainly affected by geographic factors and large scale non-geographic factors such as large-geomorphic unit as well as human activities in terms of regional condition and management level. The spatial pattern of agricultural land resources quality is resulted from multi-factor interactions.