青海省黄土丘陵区土壤微量元素空间变异特征及有效性

Spatial Variability and Its Effectiveness of Trace Elements in Soil of Loess Hilly Region of Qinghai Province

对青海省黄土丘陵区土壤中主要微量元素的空间变异特征及动态变化进行了研究。结果表明,研究区域中的有效态微量元素铁、铜、锌、硼均属较高变异,有效锰属于中度或高度变异。从土系来看,黑褐土、黑钙土的各有效态微量元素含量均达到丰富级(高),灌淤土的有效态微量元素均远低于临界值。从土壤分层来看,其变异系数变化不大。灌木林地土壤微量元素相对缺乏,仅有效硼达丰富级,混交林地的有效态微量元素含量均达到中高水平。

The spatial distribution and dynamic change of main trace elements in soil were studied in the loess hilly region of Qinghai Province. The result showed that the effective trace elements Fe, Cu, Zn, B had higher variability, Mn had higher or moderate variability. In view of soil series, the effective state of trace el- ements in the Dark Cinnamon and the Chernozem reached the rich level（high level）, while that in the irriga- ted soil was far below the threshold. From the view of the soil stratification, the coefficient of variation changed little. In the shrubbery forest lands, soil trace elements were lacking relatively expect available B which just reached to the rich level. However all the trace elements reached the high levels in the mix forest lands.