岩溶山区土壤水的地球化学特征及其与土壤环境的关系

发布时间：2019-03-14 13:10

【摘要】：对2015年所采集的0~20 cm、20~40 cm土壤水样品和对应的土壤样品进行了测试分析,运用灰度关联和典范对应分析的方法研究了岩溶峰丛山区土壤水的地球化学特征及其与土壤环境条件的关系。结果表明:岩溶峰丛山区土壤水地球化学性质及其对应的土壤环境指标均存在不同程度的空间异质性,其中土壤水和土壤中的p H值变异系数在2.48%~10.44%,变异最小;除了镁离子和氯离子,土壤水的其他地球化学指标的变异系数均表现为0~20 cm大于20~40 cm,20~40 cm土壤水地球化学性质更为稳定。土壤水的HCO-3、Ca2+、SO2-4浓度是影响土壤水地球化学特征的主要因子,且HCO-3起到主导作用。典范对应分析结果显示,不同的土壤水地球化学性质与土壤环境因子关联性差异明显,影响土壤水地球化学特征的主要土壤环境因子中的全钾含量、交换性镁含量、有效锌含量、0.2~2.0 mm粒径和0.002~0.020 mm粒径的土壤颗粒等因子对土壤水中的Mg2+浓度、HCO-3浓度、p H值影响较大,有效铜含量、胡敏酸含量、胡敏素含量主要影响土壤水中Na+浓度、K+浓度,而速效钾含量、土壤含水率、小于0.002 mm粒径机械组成等土壤因子则主要是通过Na+浓度、K+浓度、Cl-浓度、SO2-4浓度等指标影响土壤水的地球化学特征。
[Abstract]:The 0 / 20 cm,20~40 cm soil water samples collected in 2015 and the corresponding soil samples were tested and analyzed. The geochemical characteristics of soil water in karst peak cluster mountain area and its relationship with soil environmental conditions were studied by means of gray-scale correlation and canonical correspondence analysis. The results showed that the geochemical properties of soil water and its corresponding soil environmental indexes existed spatial heterogeneity in different degrees. The coefficient of variation of pH value in soil water and soil was 2.48% ~ 10.44%, and the variation was the least. Except for magnesium and chloride ions, the coefficient of variation of other geochemical indexes of soil water shows that the geochemical properties of soil water are more stable than that of 0 / 20 cm and 20 / 40 cm,20~40 cm. The concentration of HCO-3,Ca2 and SO2-4 in soil water is the main factor affecting the geochemical characteristics of soil water, and HCO-3 plays a leading role. The results of canonical correspondence analysis showed that the correlation between different soil water geochemical properties and soil environmental factors was significant, and the total potassium and exchangeable magnesium contents in the main soil environmental factors affecting soil water geochemical characteristics were significantly different. The available zinc content, 0.2 ~ 2.0 mm particle size and 0.002 ~ 0.020 mm soil particle size had significant effects on the Mg2 concentration, HCO-3 concentration, p H value, available copper content and humic acid content in soil water, and the content of available copper and humic acid in soil water. The content of humin mainly affected the concentration of Na and K in soil water, while the content of available potassium, the content of soil moisture and the mechanical composition of particle size less than 0.002 mm were mainly influenced by the concentration of Na, the concentration of K, the concentration of Cl-, and so on. The geochemical characteristics of soil water were influenced by SO2-4 concentration and other indexes.
【作者单位】： 西南大学资源环境学院;中国地质科学院岩溶地质研究所;
【基金】：国家重点研发计划项目(2016YFC0502402) 国家自然科学基金项目(41502257) 中国地质大调查项目(DD20160324) 中国地质科学院基本科研业务费项目(2017026)
【分类号】：S153
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本文编号：2440011