中国岩溶Issue(3)：347-355,9.
基于 GIS 和改进灰色关联模型的岩溶区土壤肥力评价--以重庆市丰都县岩溶区为例
Comprehensive evaluation of soil fertility in karst area by GIS and improved Grey Relation Model:A case study in Fengdu county karst area,Chongqing
摘要
Abstract
Soil fertility evaluation can provide the basis for rational fertilization and agricultural production structure adjustment.Under the technical support of GIS,we take Fengdu county karst area as research ob-ject and collected 31 6 soil sample of this county,according to topographical features,land use status and soil types.In this paper,we report organic matter,total nitrogen,available nitrogen,available phosphorus,a-vailable potassium,available sulfur,available cuprum,available iron,available manganese,available zinc, available boron content and pH for all soil samples.Based on data,we evaluated the soil fertility of the coun-ty by using Grey Relation Model improved by principal component analysis and membership function,and discussed the special distribution characteristics by using statistical methods.The study shows that the soil integrated fertility index (IFI )in the study area ranged from 0.352 to 0.881 with the average value of 0.579 in the study area.Geostatistical trend analysis of IFI presented a one-order (linear)global trend and semi-variance analysis of the residuals showed a weak degree of spatial correlation.Overall fertility quality in the study area is middle or better,the second soil fertility grade region accounted for 10.61%,the third soil fer-tility grade region accounted for 31.09%,and the fourth soil fertility grade region accounted for 35.94%. The contribution rates for integrated fertility of soil conventional nutrient indexes and microelement indexes were 76.77% and 23.23%,respectively.Therefore,bringing microelement indexes into the soil fertility e-valuation index system is reasonable and practicable,the improved Grey Relation Model can quantitatively e-valuate integrated soil fertility,and the geostatistical method can satisfactorily reveal spatial variation pat-terns in soil fertility.关键词
土壤肥力/灰色系统/综合评价/空间变异/岩溶区Key words
soil fertility/grey system/comprehensive evaluation/spatial variability/karst area分类
农业科技引用本文复制引用
孙宇,高明,王丹,邓炜,陈成龙..基于 GIS 和改进灰色关联模型的岩溶区土壤肥力评价--以重庆市丰都县岩溶区为例[J].中国岩溶,2014,(3):347-355,9.基金项目
国家“十二五”科技支撑计划项目(2012BAD141318) （2012BAD141318）
