土壤空间数据库支持的陕西土壤肥力评价

Evaluation of soil fertility in Shaanxi based on soil space database

【目的】改进传统的土壤肥力评价方法。【方法】在陕西土壤空间数据库的支持下，应用层次分析法和模糊综合评价法，基于GIS环境对全省土壤肥力进行综合评价，并编制了土壤肥力评价等级图。【结果】陕西省土壤肥力质量较差，以3～6级肥力为主，占总面积的74.5%，其次为2、7级肥力土壤，1、8级肥力土壤所占比例很小，不足5%;陕西省北部土壤肥力偏低，大多在4级以下，关中地区以3、4、5级土壤居多，南部山区以2、3、4级肥力土壤为主。【结论】基于土壤空间数据库的肥力评价，实现了土壤肥力的分级评价自动化，提高了结果的科学性和客观性。

[Objective] The study was done to improve the traditional evaluation method of soil fertility. [Method] Based on Shaanxi Soil Spatial Database,in GIS environment, the soil fertility in the province was evaluated by using the Analytic Hierarchy Process and Fuzzy Comprehensive Appraisal Method, and the evaluated map of soil fertility was also compiled. [Result] Soil fertility in Shaanxi province falls into low grades. The soil with a fertility grade of 3-6 is the most,which accounts for 74.5% of the total,followed by soil with a fertility grade of 2 and 7, and soil with a fertility grade of 1 and 8 is the least, which takes up less than 5% of the total. Soil fertility in the northern area of Shaanxi province is low which is dominated by grade 5 to grade 8, and soil fertility in Guanzhong area mainly takes grade 3,4,5 while it mainly takes 2,3,4 in south mountain areas. [Conclusion] An automatic gradation of cultivated soil is achieved and more accurate,objective results are obtained with the application of Soil Space Database.