黄河下峪口段表层土壤pH、Eh分布及其主要影响因素

The States of pH, Eh in Xiayukou Section of the Yellow River and Their Effect Factors

摘要: 通过对黄河下峪口段河道表层淤积物和沙洲表层土壤pH和Eh的样品采集，分析了该段表层土壤pH及Eh的分布状况，并从底质特性、周边环境和生物扰动等方面深入探讨了pH、Eh的分布特征、影响因素和影响机理。研究表明：黄河下峪口段河道沉积物及沙洲表土呈中性–弱碱性环境，其中pH值变化于7.54~8.12之间，空间分布上具有分带性和不均一性特征，总体表现为河道沉积物pH值低于沙洲表土pH值。黄河下峪口段河道沉积物和沙洲表土总体尚未氧化环境，Eh变化分布于413~521 mV之间，大部分在483 mV左右，空间分布也具有弱分带性和不均一的特点，表现为河道沉积物Eh低于沙洲表土，也就是说河道沉积物氧化性强于沙洲表土。该区域土壤pH和Eh主要受到水动力作用、河道底质特性以及土壤有机质含量的影响，pH和Eh值呈负相关关系。

Abstract: Based on the collection of surface sediment and the surface pH and Eh of the surface soil of the Xiayukou section of the Yellow River, we analyzed the distribution of the segment of the surface soil pH and Eh, and discussed from the aspects of sediment quality, surrounding environment and bioturbation. PH, Eh distribution characteristics, influencing factors and influencing mechanism. The results show that the sediment in the lower reaches of the Yellow River and the top-soil of the sandbank are neutral-weakly alkaline. The pH value varies between 7.54 and 8.12, and the spatial distribution is characterized by zonality and heterogeneity. The pH value of the sediment is lower than that of the sand surface. The Eh changes are distributed between 413 and 521 mV, most of them are about 483 mV, and the spatial distribution is also characterized by weakly zoning and heterogeneity, which is characterized by the river sediment Eh is lower than the sand surface, that is, the river sediment is stronger than the sand surface. The soil pH and Eh were mainly affected by hydrodynamic action, river sediment quality and soil organic matter content, and the pH and Eh were negatively correlated.