贵州毕节植烟区土壤pH空间分布特征及对施肥的影响

以贵州省毕节植烟区为研究对象，探讨了毕节烟区土壤pH变异的主要影响因子，通过地统计插值方法获得了土壤pH空间变异特征，并对该地区以改良酸化土壤为目的的炭基有机肥施用适宜性等级进行了划分。毕节烟区土壤pH均值为6.5，其中大方和威宁两县的pH均值较低，仅为6.2，而织金、金沙和黔西三县的pH均值超过了7.0。因子分析表明，成土母岩和土壤类型是毕节烟区土壤pH变异性的主控因子。从空间分布特征来看，土壤pH整体分布呈现东部高于中西部，金沙县西北部、大方县东部、黔西县中部等地区pH均较高，而威宁县南部、赫章中北部和七星关区中西部等地区的土壤pH整体低于其他区域；土壤pH处于适宜等级(5.5

Spatial Distribution Characteristics of Soil pH and Its Effect on Fertilization in Bijie Tobacco Growing Areas in Guizhou Province

Taking Bijie tobacco planting area in Guizhou Province as the study area, based on the analysis of the influence of different factors on soil pH, the main controlling factor of soil pH variation was discussed, and the spatial variation characteristics of soil pH were obtained by geostatistical interpolation method. Then the suitability grades of carbon-based organic fertilizer for improving acidified soil in this area were divided. The average value of soil pH in Bijie tobacco growing area was 6.5. The average value of soil pH in Dafang and Weining counties are both only 6.2, while those in Zhijin, Jinsha and Qianxi counties are all more than 7.0. The comparative analysis showed that soil parent rock and soil type were the main controlling factors of soil pH variability in Bijie tobacco growing area. From the perspective of spatial distribution characteristics, the soil pH distribution in the east is higher than those in the middle and western regions. The pH values in the northwest of Jinsha County, the east of Dafang County, and the middle of Qianxi county are higher, while the soil pH values in the south of Weining County, the middle and north of Hezhang County, and the middle and west of Qixingguan district are lower than thaose in other regions as a whole; the area proportion of soil pH in the appropriate grade (5.5