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在宣威市烟田耕作层土壤属性数据的基础上,研究了土壤颗粒分形维数与土壤机械组成、土壤质地和土壤养分间的关系,建立了植烟土壤颗粒分形维数的预测函数。结果表明:除了<1.0 mm颗粒含量外,土壤颗粒分形维数与低于一定粒径的颗粒含量呈极显著正相关,且测定的粒径越小,直线斜率和相关系数越大,这表明随着土粒直径减小,分形维数增加。土壤颗粒分形维数重点反映黏粒含量,其次是粉粒含量。宣威市植烟土壤质地以壤土为主,适合优质烟的种植,土壤颗粒分形维数介于2.4889~3.8905之间,土壤颗粒分形维数可作为描述土壤质地的综合性定量指标,但土壤有机质、全氮、全磷、全钾含量与土壤颗粒分形维数的单相关性均不显著。建立的植烟土壤颗粒分形维数估算函数预测准确度和精确度高,分别为0.9714和0.9617,且相对误差较低(-0.8236%~0.8208%),能很好地用于模拟植烟土壤分形维数。
Based on the data of soil properties in tobacco field of tobacco field in Xuanwei city, the relationship between fractal dimension of soil particles and soil mechanical composition, soil texture and soil nutrient was studied, and the prediction function of soil particle fractal dimension was established. The results show that the fractal dimension of soil particles is significantly and positively correlated with the content of particles below a certain particle size except the particle content of <1.0 mm, and the smaller the measured particle size is, the larger the slope and the correlation coefficient of the line are With the decrease of soil particle diameter, the fractal dimension increases. The fractal dimension of soil particles mainly reflects the clay content, followed by the grain content. Soil texture of tobacco planting in Xuanwei City is dominated by loamy soil, which is suitable for planting high-quality tobacco. The fractal dimension of soil particles is between 2.4889 and 3.8905. The fractal dimension of soil particles can be used as a comprehensive quantitative index to describe soil texture, but soil organic matter The single correlations of total nitrogen, total phosphorus, total potassium and soil particle fractal dimension were not significant. The prediction accuracy and precision of the estimated fractal dimension function of tobacco soil particles were 0.9714 and 0.9617, respectively, and the relative error was low (-0.8236% -0.8208%), which could be used to simulate the soil fractal dimension.