利用地统计学和回归分析方法分析四川省盐源县植烟土壤碱解氮、有效磷、速效钾含量空间变异特征以及不同因素对其空间变异的影响，以期为盐源烤烟种植区划、科学施肥和产质量提升提供科学依据。结果表明：①碱解氮、有效磷和速效钾的均值分别为102.84、10.18、148.10 mg/kg，整体处于中等水平，变异系数分别为38.66%、90.08%、60.65%，达到中等变异程度，空间分布不均；②碱解氮、有效磷空间分布符合指数模型，具有中等空间自相关，速效钾符合高斯模型，具有明显空间自相关，空间变异受结构性因素和随机性因素共同影响；③盐源植烟土壤碱解氮、有效磷和速效钾空间变异的主控因素有所不同，碱解氮为坡度和前茬作物，有效磷为土壤类型和前茬作物，速效钾为海拔和坡度，因此植烟区规划和施肥需要综合考虑不同的影响因素。

In order to provide scientific references for tobacco planting, reasonable fertilization and improvement of tobacco quality, the spatial distribution characteristics of available nutrients of tobacco planting soil in Yanyuan, Sichuan Province were investigated using geostatistics and the effects of the influencing factors on these characteristics were examined by regression analysis. The results indicated: 1) The means of soil available N (AN), available P (AP) and available K (AK) in the study area are 102.84, 10.18 and 148.10 mg/kg, respectively, and all of them are in the middle level. Their coefficients of variation are 38.66%, 90.08% and 60.65%, respectively, and reached middle variation degree, showing uneven spatial distribution. 2) The exponential model fitted spatial distributions of soil AN and AP well with a moderate spatial dependence, while Gaussian model fitted soil AK well with a high spatial dependence. The spatial variabilities of the nutrients are affected by structural and random factors synchronously. 3) The spatial variabilities of tobacco planting soil AN, AP and AK in Yanyuan have different main controlling factors. The main controlling factors of AN are slope and previous crop. The factors for AP are soil type and previous crop and are altitude and slope for soil AK. Therefore, various influencing factors need to be considered for selection of tobacco planting soils and fertilization.

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四川省教育厅科研项目(16ZB0048)、中国烟草总公司四川省公司科技项目(scyc201402006)、四川中烟工业有限责任公司重点项目(130235、130236)资助。