农业环境科学学报Issue(12)：2343-2349,7.DOI:10.11654/jaes.2014.12.010
酸化方式对土壤中铜的形态及生物有效性的影响
Effects of Different Acidification Methods on Forms and Bioavailability of Cu in Soils
摘要
Abstract
The influence of soil acidification on forms and bioavailability of heavy metals in soils has not been understood well. In this study, two types of Cu polluted soils collected from Daye, Hubei(yellow brown soil)and Shouguang, Shandong(alluvial soil)were used to examine the changes of forms and availability of soil Cu under three different acidification treatments, i.e. direct acidification--sulfuric acid(T1), fertilizer acidification--ammonium sulfate(T2)and simulated acid rain(T3). Acidification treatments decreased the biomass of Brassica ol-eracea L., but increased the shoot Cu concentrations(P<0.05). In alluvial soil, the maximum concentration of the shoot Cu was 1.43 times as much as the minimum, and 1.50 times in yellow brown soil. Soil exchangeable Cu increased significantly with increasing acidification. Com-pared with the control, 0.1 mol·L-1 MgCl2-exchangeable Cu was up to 10.7%, an increment of 451.5%, in the alluvial soil;while it was up to 12.07%, an increase of 418%in the yellow brown soil. Significant positive correlation was observed between soil exchangeable Cu and the shoot Cu of Brassica oleracea L. with correlation coefficient above 0.80. However, soil exchangeable Cu had a significant negative linear correlation with soil pH [lg(EXC)=-alg(pH)+b], with the slope of-0.314~-0.352.The increase of soil Cu bioavailability by soil acidifica-tion followed the order:T3﹥T2﹥T1, showing that the bioavailability of heavy metals would be greater in soils acidified by acid rain than in those by fertilizers and industrial wastewater.关键词
土壤酸化/铜/形态/生物有效性Key words
soil acidification/copper/forms/bioavailability分类
资源环境引用本文复制引用
宋文恩,郭雪雁,陈世宝,李娜..酸化方式对土壤中铜的形态及生物有效性的影响[J].农业环境科学学报,2014,(12):2343-2349,7.基金项目
国家自然科学基金项目 （）
