内蒙古托克托地区土壤养分状况评价

选取内蒙古主要产粮基地之一的托克托地区作为研究对象,以多目标地球化学调查获取的1556个表层土壤样品的测试数据为基础数据,基于多元地学数据空间数据管理与分析系统(GeoExpl)对土壤中有机质、全氮、全磷、全钾含量进行描述统计及空间分布分析,并采用模糊数学和改进的内梅罗指数对区内的土壤养分综合质量进行分级。结果表明:研究区表层土壤养分综合质量中等,土壤养分因子的含量水平为全钾全磷有机质全氮,磷元素和钾元素是土壤养分的主要贡献因子,氮元素为土壤养分的最主要限制性因子;从养分因子的空间分布状况看,研究区北部及西北部的土壤养分状况较好。在此基础上,根据土壤养分综合质量、地形及地表状况对研究区进行了简单的农业分区规划,认为研究区西北部的平原区为主要的农业生产区。

Analysis and Evaluation of Soil Nutrient of Tuoketuo Area in Inner Mongolia

Hetao Plain is a typical kind of irrigated agriculture area in Inner Mongolia.This study focused on the Tuoketuo area in the east part of Hetao Plain.Totally 1,556 samples of the surface soil were analyzed based on the GeoExpl system and four soil nutrients including organic matter,nitrogen,phosphor and kalium in the top soil were analyzed.A fuzzy comprehensive assesment using the improved Nemerow index method is carried out.The result can reasonably reflect the region's soil nutrient quality;the soil nutrient is in the middle level.Among these soil nutrients,the maximum of the level is K and the minimum is N.P and K make primary contribution to soil nutrients and N is the primary restrictive factor of soil nutrient in this area.The total level of the soil nutrient in the north and the northwest area is better than other areas of Tuoketuo.Finally,with the analysis of the soil nutrient and the terrain,three different agricultural divisions are carried out.The plain in the northwest is considered as the best agricultural area.