山东省临沭县北部土壤养分特征及综合肥力评价

在山东省临沭县北部农耕区进行耕层土壤样品采集，并测定土壤pH、有机质、全量及速效氮磷钾等养分指标来表征土壤肥力，运用因子分析法、聚类分析法计算出所有样本土壤养分综合评价值并进行等级划分来评价土壤肥力。结果表明临沭县北部土壤酸化严重，有机质和全氮、速效钾含量较低，全钾、全磷、碱解氮、速效磷比较丰富。因子分析显示TN、OM、AK、AP、TP、pH是影响临沭县北部土壤养分综合状况的主要因素。临沭县北部土壤肥力水平偏低；土壤养分综合评价值(IFI)具体表现为：郑山街道>青云镇>玉山镇>临沭街道>蛟龙镇。

Soil Nutrient Characteristics and Comprehensive Fertility Evaluation in the North of Linshu County

The topsoil samples are collected in the northern farming area in Linshu county in Shandong province, and pH, organic matter, total amount and available nitrogen, phosphorus and potassium of soil have been measured to characterize the soil fertility. The comprehensive evaluation values of soil nutrients of all samples are calculated by factor analysis and cluster analysis, and the soil fertility is evaluated by grading. It is showed that the soil acidification in the north of Linshu county is serious, the contents of organic matter, total nitrogen and available potassium are low, and the contents of total potassium, total phosphorus, alkali-hydrolyzable nitrogen and available phosphorus are relatively rich. Factor analysis shows that TN, OM, AK, AP, TP and pH are main factors affecting comprehensive status of soil nutrients in the north of Linshu county. The soil fertility level in the north of Linshu county is low. The comprehensive evaluation value of soil nutrients (IFI) is as follows: Zhengshan Street>Qingyun Town>Yushan Town>Linshu Street>Jiaolong Town.