GIS支持下乡镇域土壤肥力评价与分析

Soil Fertility Evaluation Based on GIS at Town and Township Level

在地理信息系统支持下,以鄂南典型红壤丘陵区为例,研究了乡镇域土壤肥力评价的方法和过程,分析了土壤肥力变化原因。结果表明,应用GIS对乡镇域土壤肥力进行评价能克服速度慢、数据更新不方便的缺点,避免乡镇农业决策者主观判断土壤肥力等级的弊病,为生产布局和用地决策提供准确的科学依据。试区土壤肥力与土壤养分、土地利用和区域经济有关,肥力等级有向中等级变化的趋势。

To set a typical township in red soil (Ultisols) hills of Hubei province as an example, the methods and process of soil fertility evaluation were studied at township level based on GIS (Geographical Information System), and the reason why soil fertility changed was also discussed. Soil evaluation system with GIS at township level has many advantages, such as to update the data easily and rapidly, and from which the results are reasonable since they come from comprehensive analyses instead of judgement coming directly from decision-maker and agricultural leader. Results show that soil fertility is closely related to contents of soil nutrients, to types of land use and to local economic conditions; and that soil fertility is changeable, and the various soil fertility tends to become the middle fertility class.