应用生态学报2013，Vol.24Issue(7)：2025-2032,8.
不同老化时间对土壤中外源Zn的形态转化及生态毒性阈值(ECx)的影响
Effects of aging time on the form transformation and eco-toxicity threshold (ECx) of added Zn in typical China soils
摘要
Abstract
Six typical China soils with different properties were selected and added with seven concentrations of ZnC12 to study the effects of different aging time (14,90,180,360,and 540 days) on the form transformation and eco-toxicity threshold (ECx) of added Zn in the soils,with the main affecting factors analyzed.The results indicated that with the increase of aging time,the fraction of 0.01 mol · L-1 CaC12-extracted Zn in the soils decreased sharply initially,then slowed down,and reached the dynamic balance after 540 d incubation.The eco-toxicity thresholds (ECx,x =10,50) of Zn to bok choy increased significantly with aging time (P＜0.05),which implied the marked decrease of the phyto-toxicity of Zn.The measured aging factors AF10 and AF50 of Zn ranged from 1.077-1.743 and 1.174-1.441,respectively,and increased with aging time.The balanced concentration of Zn in the soils was significantly negatively correlated with soil pH,CEC,and organic carbon (Org-C) content,and soil pH was the most important controlling factor,followed by CEC and Org-C.It took shorter time to reach Zn balance in the soils with higher pH.The prediction model of the ECx of Zn was developed based on the aging factors and the main soil properties,and could be well validated by the measured ECx under field condition.This study would provide theoretical basis for the normalization of the eco-toxicity thresholds of added Zn in different soils and the formulation of the environmental criterion of Zn in China soils.关键词
Zn/老化因子/形态/毒性阈值/土壤性质Key words
zinc/aging factor/form/eco-toxicity threshold/soil property分类
资源环境引用本文复制引用
林蕾,陈世宝,刘继芳,马义兵..不同老化时间对土壤中外源Zn的形态转化及生态毒性阈值(ECx)的影响[J].应用生态学报,2013,24(7):2025-2032,8.基金项目
国家自然科学基金项目(21077131,41271490)和农业部农业公益性行业科研专项(200903015,201103007)资助. （21077131,41271490）
