广东省杨村华侨柑桔场土壤微量元素含量与分布的研究

采集并分析全场不同母质形成的有代表性的土壤样本142个.研究结果表明，各类土壤全B、Mo、Zn和Mn含量的平均值均低于全国平均值，全量Cu平均值高于全国平均值.有效B、Mo、Zn和Mn含量的平均值均低于临界值，有效Cu的平均值稍高于临界值;但66.7％的土样有效Cu含量低于临界值.硼、钼、锌和锰严重缺乏，铜多数缺乏.全场各类土壤的微量元素含量差异较大，各类土壤微量元素的垂直和水平分布特征不尽相同，尤其是垂直分布差异明显.从土壤微量元素的全量与母质的关系来看，以玄武岩、紫色砂页岩母质形成的土壤全量较高，砂砾岩母质形成的土壤全量中等，砂页岩和冲积物母质形成的土壤全量较低.

Study on the Content and Distribution of Trace Element in the Soils or Yangcun Overseas Chinese Orange Farm in Guangdong

Trace element content and distribution of 142 samples of soils formed from different soil-forming parent material in Yangcun Overseas Chinese Orange Farm in Guangdong are determined. Results indictated that the average contents of total B, Mo, Zn and Mn in various soils of the farm are all lower than mean contents of the soils in China, whereas that of total Cu is higher than mean content in the soils of our country. The average contents of available B, Mo, Zn and Mn in the soils of the farm are all below critical values, and that of available Cu is slightly above critical value, but the average contents of available Cu from the 66.7% of the soil samples are below the critical value. B, Mo, Zn and Mn are seriously deficient and Cu is the most. Trace element contents of different soils vary in a great range, and they distribute unevenly, especially, the vertical distribution of face element in various soils of the farm has a signiticant difference. According to the relations of the total contents to the parent materials, the soils from purple sand-shale rock have higher total contents, from grit rock have medium. from sand-shale rock and alluvial deposit have lower ones.