不同季节土壤浅剖面含镉量的变化规律  

Temporal and Spatial Variabilities of Soil Cd in Different Seasons

作　　者：史锟[1] 尼中伟[1] 于丽华[1] 

机构地区：[1]大连交通大学环境与化学工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2009年第5期52-54,共3页Journal of Dalian Jiaotong University

基　　金：农业部948计划资助项目(660087)

摘　　要：在不同季节采集沈阳西郊大学城附近不同层次的镉污染土壤，研究土壤浅剖面含镉量的变化规律．结果表明，土壤镉主要集中在土壤1～20cm的表层，1～50cm土壤含镉量逐渐减少，但随时间增长土壤镉正在向深层土壤运移．1～20cm表层土随春、夏、秋季时间变化含镉量逐渐减少，到冬季略有增加；21～30cm层土随春、夏、秋季时间变化含镉量逐渐增加，到冬季略有减少；31～50cm深层土随春、夏、秋、冬季时间变化含镉量持续增加．对土壤镉运移产生影响的因素包括植物吸收、雨水淋溶和土壤毛细管作用等．该地区土壤镉具有不断向深层土壤迁移的趋势，镉污染土壤的范围不断扩大．Soil contaminated by Cd was sampled from university town of Shenyang western suburb in different seasons. The rule of temporal and spatial variabilities of soil Cd was studied. Experiment results show that the soil Cd is mainly concentrated in surface layer （1 -20 cm）. Cd concentrations are sharply decreased with soil depth, but the Cd is continuously transferring to （21 - 50 cm） deepth. Cd concentrations in surface layer is decreased gradually in spring, summer and autumn, but increased a little in winter than that of autumn. Cd concentrations in the layer of 31 - 50 cm depth gradually increased in four seasons. The reasons of the soil Cd transferring may be rainfall washing and effect of soil capillary and plant absorption. Soil Cd is gradually transferring into deep layer from surface layer, and the range of Cd contaminated region is gradually expanding in the research area.

关 键 词：镉污染土壤 不同季节 浅剖面 

分 类 号：X53[环境科学与工程—环境工程]