岩溶地区土壤微量元素分布的研究

为探讨岩溶地区土壤微量元素分布规律,选取广西6个不同岩溶地区的10个石灰性土壤剖面、不同层次样品共32个,进行微量元素Cu、Zn、Fe、B的有效含量分析。结果表明:同一层次不同样品有效Cu、Zn、Fe含量差异较大,而有效B含量差异较小;有效微量元素含量自土壤剖面由上而下呈明显的递减性分布。此外,不同岩溶地区有效Cu、Zn含量差异不显著而有效Fe、B差异显著;在岩溶地区,绝大部分土壤缺乏B、Zn,部分土壤缺Fe或Fe过高,而有效Cu比较适中,但个别土壤表层Cu、Zn含量过高。因此,必须根据不同地区不同情况来合理施用相应的微量元素肥料,增施有机肥才能获得作物的高产优质。

Study on the distribution of microelements in soil in Karst area

In order to study the distribution of microelements in soil in Karst area,32 soil samples were collected from different levels in 10 profiles of calcarious soil in six different locations.The effective content of Cu, Zn,Fe and B of the samples were analyzed.The results showed that there were great differences among the effective content of Cu,Zn and Fe in different samples in the same level of soil,while there was little difference in B of different samples.The distribution of effective content of microelements was decreasing through top-down of soil profile.Moreover,the difference of Cu and Zn content in different locations was not significant,while that of Fe and B was significantly different.B and Zn was deficient in most of the soils.Fe was deficient in some samples but excessive in some samples.The effective Cu was optimal,while in some soil surface,the content of Cu and Zn was too high.Therefore,microelements fertilizer should be applied rationally according to microelement status in soils in different areas,and organic fertilizer should be added to improve the yield and quality of crops.