遵义市植烟土壤养分状况分析

Analysis of Nutrient Status of Tobacco Planting Soils in Zunyi

对遵义市91个植烟土样12个养分指标进行了主成分和聚类分析,提取了4个主成分,计算出了各植烟县土壤肥力的综合得分。对综合得分以欧氏距离为衡量土样间差异大小的指标,采用系统聚类法,按距离系数8进行截取,将10个植烟县土壤类型分为5类。评价结果为:遵义县单独为一类,土壤肥力综合排名最高,属高氮、高磷、中钾区。湄潭县、余庆县、道真县、务川县4个县聚为一类,综合排名第二,属中氮、中磷、中钾区。绥阳县单独为一类,土壤肥力综合排名第三,表现为中氮、中磷、高钾的特征。桐梓县、凤冈县、正安县三县聚合为一类,土壤肥力综合排名第三,为中氮、中磷、低钾区。仁怀县单独为一类,土壤肥力排名最低,为低氮、低磷和中钾区。

Principal component analysis and systemic cluster analysis were used to analyze 12 nutrient indices of 91 soil samples from Zunyi. Four principal components and general index of each flue-cured tobacco planting county were obtained. According to the cluster graph and 8 distance modulus, the soil samples of Zunyi were divided into 5 groups. The first group was Zunyi county with high nitrogen （N）, high phosphorus （P）, and middle potassium （K）. The second group included Meitan, Yuqing, Daozhen, and Wuchuan, whose characters were middle N, middle P and middle K. The third group was Suiyang with middle N, middle P and high K. The fourth group included Tongzi, Fenggang and Zheng＇an, whose characters were middle N, middle P and low K. The last group was Renhuai with low N, low P, and middle K.