鄂尔多斯高原皇甫川流域不同土地利用类型土壤微量元素的比较分析

Comparative Study of Soil Trace Elements under Different Land Use Types in Huangpuchuan Watershed,Inner Mongolia

对鄂尔多斯高原皇甫川流域不同土地利用方式下土壤微量元素进行比较研究,结果表明:皇甫川流域土壤中Zn的含量普遍较低,远小于缺Zn临界值;Fe的含量在多数土壤中亦较低,小于缺Fe临界值;而Cu和Mn的含量却较高,大于临界值.不同土地利用方式下,根系集中分布的10～20cm土壤层中的元素含量除Mn以外,其他三个元素基本上以恢复样地最高,这说明恢复效果比较明显,土壤的养分状况已经有了明显的好转.各类土壤微量元素的剖面分布比较复杂,没有明显的规律性.不同微量元素的含量在植物不同生长期、不同样地表现出不同的变化特征,只有Fe元素表现出明显的季节动态.

Contents of available trace elements under different land use types in Huangpuchuan Watershed in Inner Mongolia were determined. The results indicated that the contents of Zn were lower than the critical value in all soil types, and the contents of Fe were also lower than the critical value in majority of soil types, but the contents of Cu and Mn were higher than critical values. In soll layer of 10-20 cm where the plant roots concentrate, the contents of Cu, Fe and Zn in recovery grasslands were the highest among all plots, but Mn was an exception. It was evident that recovery had effect. The vertical variety of main trace elements along soil profile was complicated, and regulation cannot be got. Contents of available trace elements had different dynamic change in different sample plots from August to October, only did the content of Fe show obviously seasonal variation.