曲靖烟区海拔高度分布特点及其与土壤养分的关系

Altitude Distribution in Qujing Tobacco Growing Areas and its Relationship with Soil Nutrients

分析了云南省曲靖市主产烟区9个县96个乡镇1778个土壤样品养分的含量特征，并在此基础上探讨了其与海拔高度的关系。结果表明：曲靖烟区植烟田海拔多位于1300～2400m，平均海拔为（1929．03±168．78）m，海拔变化较大，变幅为1322～2380m。海拔高度与土壤有机质、有效锰、有效硼、有效硫呈极显著正相关；与碱解氮呈显著正相关；与pH、全磷、全钾、速效磷、速效钾、有效钙、有效镁呈极显著负相关；与全氮间相关关系不显著。海拔高度与土壤养分关联度大小排序前3位分别为pH、碱解氮和全氮。随着海拔高度的增加，土壤有效锰、有效硼、有效硫的含量呈递增趋势；pH、速效磷、速效钾和有效镁含量逐渐降低。

The nutrient contents in 1778 soil samples from main tobacco growing areas in 96 towns of 9 counties of Qujing City in Yunnan Province were analyzed, and their relationships with altitude were investigated. The results showed that Qujing tobacco growing areas were mainly at the altitude from 1300 to 2400 m, the average altitude was 1929.03~：168.78 m. The altitude extremely significantly positively correlated to the contents of organic matter, available manganese, available boron and available sulfur in soil, significantly positively correlated to alkali-hydrolyzable nitrogen content, and extremely significantly negatively correlated to pH, and the contents of total phosphorus, total potassium, readily-available phosphorus, readily-available potassium, available calcium and available magnesium; while its relationship with total nitrogen content was not significant. The top three soil nutrients in the order of correlation with altitude were pit, atkali-hydrolyzable nitrogen and total nitrogen contents. With the ascent of altitude, the contents of available manganese, available boron and available sulfur in soil increased gradually, while soil pH and the contents of readily-available phosphorus, readily-available potassium and available magnesium in soil reduced gradually.