豫中烤烟种植区烟叶石油醚提取物含量与土壤养分的空间变异性分析

STUDIES ON SPATIAL VARIABILITY OF CONTENTS OF PETROLEUM ETHER EXTRACTS FROM FLUE-CURED TOBACCO LEAVES AND SOIL FERTILITY FACTORS IN TOBACCO PLANNING FIELDS IN CENTRAL HENAN PROVINCE

在地统计和GIS的支持下,以半方差函数为工具,研究了豫中烤烟种植区石油醚提取物含量和土壤养分的空间变异性特征,并进行相关分析。运用普通克立格法进行最优无偏线性插值,制作了研究区内石油醚提取物含量和不同土壤养分的空间分布图。结果表明,豫中烤烟种植区石油醚提取物含量符合高斯模型,空间变异性受结构性因素影响较大;土壤属性中,土壤全磷、有效氮、速效钾、氯含量为中等程度的空间变异性,其余的都为弱空间变异性;分维数最高的是土壤有效氮和阳离子交换量,最低的是有机质、pH和硅;相关性分析表明,烟叶石油醚提取物含量与土壤pH、铝、钙、铁、镁含量均呈极显著的负相关,与土壤有效氮、速效磷、全钾、硅及全磷含量之间呈极显著的正相关。豫中烤烟种植区烟叶石油醚提取物含量和土壤养分的等值线图可更准确和直观地了解研究区的土壤养分与烟叶品质的相关关系,从而为精确施肥提供依据。

Geostatistical method,combined with geographic information system（GIS）,was applied to study the spatial variability of petroleum ether extracts from flue-cured tobacco leaves and soil fertility factors of tobacco planting fields in central Henan province.Analysis of the isotropic variogram indicated that the contents of petroleum ether extracts in the study regions could be well described with Gaussian model,which are mainly induced by structure factors.Among many soil fertility factors,soil total P,available K and Cl had a medium spatial autocorrelation,while the other properties showed weak autocorrelation.The fraction value of available N is the biggest among many soil fertility factors,of which organic matter,pH and Si are smaller than other factors.Correlation matrix of soil nutrients and petroleum ether extracts from flue-cured tobacco leaves reveal that they are significant negative correlation between petroleum ether extracts of flue-cured tobacco leaves and soil pH,Al,Ca,Fe,and Mg.Significant positive correlation was observed between petroleum ether extracts from flue-cured tobacco leaves and total K,Si,and total P in soil.The maps generated by ordinary kriging also revealed the corelation of petroleum ether extracts from flue-cured tobacco leaves and soil fertility factors in the study regions,which provided the basis for precise fertilization.