贵州草海湿地典型集水区土壤微量元素分布特征研究

以贵州省草海湿地典型集水区——沙河为研究对象,针对不同土地利用方式土壤微量元素Fe、Mn、Cu、Zn含量,开展其变化趋势及分布特征研究。结果表明,除Mn外,其他微量元素在本地区含量都较丰富。四种元素的等值线图反映,Fe含量极值出现在研究区的西北和东南部,Mn在研究区南部有范围很小的高值区,Cu的高值区主要出现在研究区东北部,而Zn的高值区出现在研究区的西南边缘部位。微量元素与大量元素以及有机质、pH等指标的相关性分析显示:Cu与Mn、P表现出极显著正相关;Mn与Cu、P表现出极显著正相关,与pH值表现出显著正相关;Fe与N表现出极显著负相关,与有机质表现出显著负相关;Zn与Mn、N表现出极显著正相关,与pH值表现出显著正相关性。除成土母质外,元素之间的共生关系、有机质、地形地貌、土壤粘粒组成等是造成不同土地利用方式下微量元素含量差异的主要原因。

Study on Distribution Characteristics of Trace Elements in Soil of

Taking Sha River area of Grass Sea in Guizhou as a study case, contents of soil trace elements (Fe, Mn, Cu, and Zn) and their distribution in different land uses were assessed. The results showed that contents of all trace elements but Mn were rich in this region. As shown in isograms, extremum of Fe appeared in the northwest and southeast of the area; Mn had a small high-value area in the south; the high-value region of Cu was mainly observed in the northeast, while high values of Zn appeared in the edge of the southwest part. Correlation analysis indicated that there was a significant positive correlation among Cu, Mn and P(p<0.01), and the same relationship appeared among Zn, Mn and N. Mn and Zn respectively showed a positive correlation with pH. Fe had a significant negative correlation with N and organic matter. In addition to parent material, symbiotic relationships among elements, organic matter, configuration of clay particle were the key factors affecting the contents of trace elements in different land use types.