基于地统计学的烤烟硫含量空间特征分析

Spatial Feature Analysis of Sulfur Concentrations in Flue-cured Tobacco Based on Geo-statistics

采用地统计学中的半方差分析法和普通Kriging插值方法研究了湖南烤烟硫含量空间分布特征，结果表明，湖南主产烟区B2F、C3F、X2F等级烤烟硫含量平均值分别为1．002％、0．851％、0．800％，大于0．7％的样本占71．6％，绝大多数样本的烟叶硫含量偏高。3个等级烤烟硫含量存在空间变异结构方差，可分别用高斯模型、球型模型、指数模型拟合，变异范围较小（变程1.072—4．102km），具有中等的空间自相关。3个等级烤烟硫含量在空间分布上，具有从湘中高值区域向湘南和湘西北降低的趋势。

Spatial distribution characteristics of sulfur concentration in flue-cured tobacco in Hunan Province was studied by semivariogram and ordinary Kriging method in geo-statistical analysis. The results showed that the means of sulfur concentrations of flue-cured tobacco in B2F, C3F and X2F grades in Hunan were 1. 002% , 0. 851% and 0. 800% , respectively. And the samples of sulfur concentrations above 0.7% accounted for 71.6% in total samples. And a majority of samples with sulfur concentrations were high. Sulfur concentrations in fluecured tobaccos with 3 grades had spatial variation structure, and variances might fit the Gaussian model, the spherical model ,the exponential model, separately. The variation range was from 1. 072 to 4. 102 kin. The spatial analysis indicated that the sulfur concentrations of B2F,C3F, X2F grades had the moderate spatial self-correlation. Sulfur concentrations in spatial distribution reduced gradually from the high sulfur concentration areas of central Hunan to southern Hunan and northwest Hunan.