基于主成分分析法的白浆土土壤肥力评价

Evaluation of Soil Fertility in Albic Soil Based on Principal Component Analysis

为促进白浆土培肥和改良,选取白浆土区不同产量水平的耕地,测定土壤物理、化学指标共11项,运用主成分分析方法进行综合评价。结果表明:提取3个主成分因子累计贡献率达80.900%,对白浆土耕地土壤肥力水平进行综合得分计算并进行聚类分析,得到高、低两类土壤肥力水平分类,综合得分范围分别为-0.83≥F≥2.11和-1.97≥F≥-1.53。白浆土肥力高低主要由土壤化学性质决定,不缺乏钾元素,因此在对白浆土培肥及改良时应加强土壤养分管理,增施有机肥同时配施化肥减少钾肥用量,该方法可对白浆土区耕地质量进行客观评价。

In order to promote the fertilization and improvement of albic soil,the cultivated land with different yield levels in albic soil area was selected,and 11 soil physical and chemical indexes were measured and evaluated by principal component analysis.The results showed that the cumulative contribution rate of the three principal components extracted by principal component analysis was up to 80.900%.The three principal component scores were further clustered,and the soil fertility were divided into two categories.The scores ranged from-0.83≥F≥2.11 and-1.97≥F≥-1.53.The fertility of albic soil was mainly determined by the chemical properties of the soil.Albic soil was rich in potassium.Therefore,it was suggested to enhance the fertilization and soil nutrient management of albic soil field by application organic fertilizer in combination with inorganic fertilize,and reducing the potassium fertilize.This method can objectively evaluate the quality of cultivated land in albic soil area.