中文摘要：

以延边朝鲜族自治州（以下简称为延边州）为研究区,对该研究区8个县市农田土壤的6项指标（pH、全氮、有机质、碱性氮、有效磷、速效钾）进行测定,并建立综合指数评价法进行土壤肥力质量评价.结果表明：1）延边州农田土壤肥力指标含量数据空间分布不均,各县市指标含量差异较大;2）延边州各指标间表现出一定的相关性.同时,限制延边州土壤肥力质量的指标主要为总氮、pH和有效磷;3）延边州农田综合肥力等级为2级,延吉市IFI值（土壤肥力综合指数）最大,龙井市IFI值最小.本研究为延边州农田土壤肥力的提高和养分的均衡提供了一定的科学参考.

英文摘要：

Along with the rise of food security and precision agriculture,soil fertility research has attracted moreattention. In this study,by taking 8 counties of Yanbian Korean Autonomous Prefecture（Yanbian）as the researchareas in 2013,six indicators was measured,including soil pH,total nitrogen（TN）,organic matter（SOM）,alkalinenitrogen（AN）,available phosphorus（AP）,potassium（AK）,soil quality evaluation with comprehensive indexevaluation method in fuzzy mathematics. The results show as follows. 1）The spatial distribution of Yanbian farmlandsoil fertility index data content is uneven,the difference of each city is significant;2）There appeared somecorrelation between all the indexes. At the same time,the major indexes that affect soil fertility of Yanbian areTN,AP and pH value;3）The level of IFI in Yanbian is 2,Yanji reached to the largest IFI value,and IFI value ofLongjing is minimum. This study provides a scientific reference for the improvement of soil fertility and nutrientbalance in Yanbian Korean Autonomous Prefecture.