永德烟区土壤pH值分布特点及其与土壤有效养分的关系

对云南永德烟区258个土壤样本的pH值分布特点及其与土壤养分的相关关系进行了分析.结果表明,云南永德烟区的的土壤pH值总体上处于适宜范围,平均值为5.97,变幅为4.61～8.23.变异系数为14.60%;处于适宜烤烟生长的pH值(5.0～7.0)的土壤样本占总样本数的88.48%;处于最适宜烤烟生长的pH值(5.5～6.5)的土壤样本占总样本数的42.31%.永德烟区不同海拔的pH值随着海拔的升高而有降低的趋势;不同土壤类型pH值的变化顺序为:砂岩赤红壤>红壤>石灰岩赤红壤>潴育型水稻土>千枚岩红壤>石灰岩红壤>砂岩红壤.不同土壤质地pH值的变化顺序为沙壤土>轻壤土>壤土.土壤pH值与有机质、有效锌、水溶性氯之间的相关关系不显著,速效氮、速效钾与土壤pH值呈显著的负相关,而速效磷、有效硫、有效硼、交换性钙、交换性镁呈显著正相关.

Correlation between pH value distribution and soil nutrients in Yongde tobacco-growing area

The pH values of soil samples from Yongde tobacco-growing area were determined,and the relationship between soil pH value and soil nutrients was analyzed.The results showed that soil pH value in this area was generally suitable for the cultivation of tobacco,with a spatial mean of 5.97,variation in 4.61~8.23 and variation coefficient of 14.60%.About 68.36% of the soil samples had pH value 5.0~7.0,which was good for the growth of high-quality tobacco.About 42.31% of the soil samples had pH value 5.5~6.5,which was most suitable for the cultivation of high-quality tobacco.The pH value showed a decreasing trend with elevation of altitudes in Yongde tobacco-growing areas.The soil pH value for different soil types was in the following order: sandstone red soil> red soil> red soil of limestone> retention of soil fertility rice> phyllite red> red limestone> sandstone red.The soil pH value for different soil texture was in the following order: sandy loam soil>light loam soil>loam soil.The correlation between soil pH value and soil nutrient content,including organic matter,available zinc,water-soluble Cl was not significant,available nitrogen and available kalium was significant of negative correlation,however available phosphorus,available sulfur,effective boron,exchangeable calcium,exchangeable magnesium were significant of positive correlation.