湖南烤烟(Nicotiana tabacum)铅含量的空间变异特性研究

Study on spatial variability of lead content under flue-cure tobacco (Nicotiana tabacum) leaf in Hunan Province,China

以2002～2003年湖南烤烟(Nicotiana tabacum)为研究对象,利用地统计学方法与GIS技术相结合的方法研究了该地区烤烟铅含量的空间分布特征.结果表明,该2年烤烟铅含量拟合为Spherical模型,并均具有明显的趋势效应.2002年和2003年湖南烟叶铅含量块金效应分别为0.26和0.17,空间相关性分别表现为近似强相关和强相关.另外,2年湖南烤烟铅含量空间分布特征相似,均表现为由西向东和由北向南递增的规律.

The spatial distribution of lead content under flue-cure tobacco （Nicotiana tabacum） in Hunan Province in 2002 and 2003 was studied with geostatistics and GIS. The best theoretical model for the lead content in tobacco leaves was the Spherical model, and the trend was obvious in each of the two years. The spatial autocorrelation of lead content in tobacco leaf was moderate and strong, because the nugget effect was 0.26 and 0.17 in 2002 and 2003 respectively. In addition, the spatial distribution of the tobacco lead content in both years was similar, increasing from west to east and from north