河北曲周盐渍土区土壤元素特征

研究了地处华北冲积平原的曲周盐渍土区土壤元素全量 (ST)、1∶1浸出液(SE)和土壤溶液 (SS)中各元素的浓度范围和特征 ,及其与地下水中元素的联系。土壤元素全量主要与土壤质地 (反映了矿物组成 )有关 ,只有盐渍化严重的土壤 ,易溶性元素对其全量的增加有一定影响。元素在土壤溶液和 1∶1浸出液中的浓度差异受土壤水分状况的影响。各土层元素在SE中的含量占全量的百分率 ,其平均值和变异系数在一定程度上说明了该元素的可溶性和移动性。土壤—地下水系统中 1m和 2m土层的大部分元素在 1∶1浸出液中的浓度平均值与地下水矿化度和与地下水中相应元素的浓度值之间呈显著或极显著相关 ,无相关关系的元素 ,大多属迁移系数较小的元素。文中还以例说明了不同盐渍化程度土壤 1∶1浸出液中元素浓度垂直剖面特征 ,以及与地下水中相应元素浓度的联系。

THE CHARACTERISTICS OF SOIL ELEMENTS IN SALT-AFFECTED SOIL AREA IN QUZHOU, HEBEI

Concentration ranges and characteristics of soil elements in soil(ST),soil 1B1extraction (SE) and soil solution(SS),and their relation with the element concentration in groundwater in Quzhou salt-affected area are studied in this paper.Differences between concentrations of element in SS and that in SE are influenced by water content in the soil.SE/ST ratio of each element and its average and variation coefficient in soil layers can illustrate its solubility and movement ability in a certain extent.The averages of SE in 1 m or 2 m soil profile of most of the elements are correlated significantly with mineralization and concentration of the same element in groundwater.There is no correlation ship between the concentrations in SE and in groundwater of those elements with low migration coefficient.In addition,the characteristics of vertical distribution of concentrations of elements in SE and its relations with the concentrations of elements in groundwater are described by some examples under different levels of salinity condition.