贵州中部山区植烟土壤微量元素分布特征

The Distribution of Microelement Contents of Tobacco-growing Fields in the Central Region of Guizhou Province

利用GPS定位在贵州中部山区采集了165份代表性土壤样品,对贵州中部山区不同成土母质发育形成的土壤不同土层有效铁(Fe)、锰(Mn)、铜(Cu)和锌(Zn)含量的垂直分布进行了比较分析。结果表明,贵州中部山区烟田耕层土壤有效Fe和有效Mn含量总体处于丰富水平,而33.3%耕层土壤有效Cu缺乏,土壤有效Zn极缺乏的土样占总体样本的6.43%;与其他成土母质相比,坡积物发育形成的土壤有效Fe含量较高,土壤有效Mn含量以坡积物和岩类风化残积-坡积物发育形成的土壤较高,而不同成土母质发育形成的土壤有效Cu和有效Zn含量差异不显著;在剖面垂直分布上,不同成土母质发育形成的土壤中微量元素含量均表现出随土层深度增加而递减的规律。

In order to investigate the characteristics of soil microelements in the central region of Guizhou Province.165 soil profile samples were collected with GPS positioning and microelement contents of the soil samples were measured.The results showed that the soil samples were generally rich in available iron（Fe） and manganese（Mn）,while available copper（Cu） and zinc（Zn） were insufficient.The available Fe content of soils developed from gully debris was higher than those developed from quaternary red clay and carbonate residual-slope wash.No significant difference of the contents of soil available Cu and available Zn was observed among soils originated from different parent materials.At the vertical direction of the soil profiles,the contents of microelement decreased with soil depth.