巫山县不同海拔高度植烟土壤的肥力评价

Fertility Characters of Tobacco-growing Soil at Different Altitudes in Wushan County

对巫山县海拔高800~1 100、1 101~1 300和1 301~1 700 m的植烟土壤肥力特征进行了研究。结果表明：土样p H值范围为4.67~7.97,从低到高3个海拔梯度的土壤p H平均值分别为6.34、6.65、6.57,海拔高度对p H值平均值影响较小;土壤碱解氮、速效磷和速效钾含量分别为59.11~238.66、3.35~51.09和12.72~391.84 mg/kg,土壤有机质含量为8.44~38.93 g/kg,中低海拔地区随着海拔高度的增加,有机质含量平均值增加;高海拔地区有机质含量变化较小;土壤中氯离子含量在5.66~19.81 mg/kg,海拔高度对土壤氯离子含量的影响较小。

The fertility characters of tobacco-growing soil of Wushan county were investigated at three different altitudes： 800~1100 m, 1101~1300 m and 1301~1700 m. The results showed that the p H range of soil samples was 4.67~7.97, and the average p H values of soils at these three altitudes were 6.34, 6.65 and 6.57 from low to high altitude, which indicated that the altitude had little influence on average p H values. The contents of soil available nitrogen, available phosphorous and available potassium were 59.11~238.66 mg/kg, 3.35~51.09 mg/kg and 12.72~391.84 mg/kg, respectively. The content of soil organic matter was 8.44~38.93g/kg, and the average organic matter content increased from low to middle altitude while with the continuous increase of the altitude, organic matter content only changed a little. The water-soluble chlorine content in soil was 5.66~19.81mg/kg, which indicated that the altitude had a small influence on water-soluble chlorine.