湖南烤烟汞含量的空间变异特征

Spatial variability of flue-cured tobacco leaf mercury content in Hunan province

以2002年和2003年在湖南62个样点采集的相同等级(C3F)烤烟为研究对象,采用地统计学与GIS技术相结合的方法研究了湖南烤烟Hg含量的空间分布.结果表明,2002年和2003年湖南烤烟Hg含量分别为0.10～0.490μg/g和0.10～0.320μg/g.均与Spherical模型无阶趋势效应拟合最好,并具有相似的趋势效应.烟叶Hg含量块金效应分别为0.061和0.055,空间相关性均表现为强相关性,空间分布特征相似,均表现为由西北向东南先升高后降低的规律.影响烤烟Hg含量的主要因素是自然因素.

The spatial distribution of mercury content under flue-cure tobacco in Hunan province in 2002 and 2003 was studied with geostatistical and GIS. The Hg content in tobacco leaf was 0.10-0.490 μg/g and 0.10-0.320μg/g in 2002 and 2003 respectively. The best theoretical model for the mercury content in tobacco leaf was the Spherical model, and the trend effect was similar of the two year. The spatial autocorrelation of mercury content in tobacco leaf was strong, because the nugget effect was 0.061 and 0.055 in 2002 and 2003 respectively. In addition, the spatial distribution of the tobacco mercury content in both years was similar, firstly increasing then declining fi＇om north to south and increasing slowly from west to east. The main influencing factors of rig content in tobacco were natural factors.