云南省文山烟区植烟土壤pH分布特点及其与主要养分相关关系研究

为了查明文山州植烟土壤基本状况，提高烤烟施肥的科学性，对文山州2011年142套土样pH值及主要有效养分含量进行了分析，结果表明:（1）全州土壤pH平均值为6.23，总体适于烤烟种植。pH值处于最适区间5.5-6.5的土壤占样品总数的43.7%；（2）全州共有5种土壤类型，pH值平均值顺序依次为:红壤<黄壤<水稻土<紫色土<石灰土；（3）随着海拔升高，土壤pH值呈降低趋势；（4）土壤有机质、速效氮、速效磷及速效钾含量平均值均达到足量标准，适于烤烟种植，但分别有19.72%和16.68%的土壤缺磷和缺钾；（5）土壤pH值与速效氮含量呈显著负相关，与速效磷和速效钾含量则无显著相关性。有机质与速效氮和速效磷含量极显著相关，与速效钾含量显著相关。 

Correlation between pH value and nutrients in soil of Wenshan tobacco-growing area in Yunnan Province

In order to ascertain the base situation of soil in Wenshan tobacco-growing area, and make the purpose of the flue-cured tobacco fertilization definite,the pH values of soil samples collected from Wenshan were determined，and the relationship between soil pH value and soil nutrients was analyzed. The results obtained were listed as follows:(1) Soil pH value in this area was generally suitable for the cultivation of tobacco, with a spatial mean of 6.23. 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; (2) The soil pH value for different soil types was in the following order: red soil