为了解黔西南州植烟土壤pH分布特征及其与土壤养分的关系，采用传统统计学和地统计学及灰色关联方法分析了黔西南州植烟土壤pH状况、空间分布及其与土壤养分的关系。结果表明：(1)邵阳烟区植烟土壤pH总体上适宜，平均值为6.65，变幅为4.68～7.87，变异系数为11.72%，处于适宜范围内的样本占51.04%; (2)植烟土壤pH值的均值从高到低依次为：安龙县、兴义市、兴仁县、贞丰县、晴隆县和普安县，安龙县植烟土壤pH值极显著高于其他各县；(3)土壤pH有随土壤质地偏粘而降低的趋势； (4)黔西南州植烟土壤pH值有从南向北递减的分布趋势，在安龙县有一个高值区，在普安县有一个低值区；(5)铵态氮、硝态氮、速效钾与土壤pH的相关性达到显著或极显著负相关；(6)土壤养分与土壤pH的关联顺序为缓效钾＞碱解氮＞有机质＞速效磷＞全氮＞全磷＞速效钾＞铵态氮＞硝态氮。
To understand soil pH distribution characteristics and its relation to soil nutrients in Qianxi’nan tobacco-growing soil, soil pH status, spatial distribution, and its relationship to soil nutrients were analyzed using the methods of traditional statistics, geo-statistics, and grey correlation analysis. The results were as follows: (1) the pH of tobacco-growing soil is generally suitable for tobacco cultivation with a mean of 6.65 (ranged from 4.68 to 7.87) and a variation coefficient of 11.72%. About 51.04% of the soil samples showed a suitable soil pH for tobacco cultivation. (2) An extremely significant difference in tobacco-growing soil pH was observed between Anlong county and other counties. The soil pH values in different counties were ranked in an increasing order as follows: Anlong county＞Xingyi city＞Xingren county＞Zhenfeng county＞Qinglong county＞Pu’an county. (3) The pH was decreased with the rise of the soil stickiness. (4) IDW interpolation map indicated that the spatial pH distribution was patchiness and showed a reduced trend from the south to the north. The areas with low pH values were in Pu’an county and the areas with high pH values were in Anlong county. (5) An extremely significant or significant negative correlation between soil pH and ammonium nitrogen, nitric nitrogen, or available potassium was observed. (6) The order for the grey correlation between soil nutrient and pH was slowly available potassium＞available nitrogen＞organic matter＞available phosphorus＞total nitrogen＞total phosphorus＞available.