[1]任伟,赵蓉,刘云根,等.湿地生境下土壤砷形态转化与微环境因子的关系[J].江苏农业学报,2019,(02):321-328.[doi:doi:10.3969/j.issn.1000-4440.2019.02.012]
　REN Wei,ZHAO Rong,LIU Yun-gen,et al.The relationship between soil arsenic speciation transformation and microenvironment factors in wetland habitats[J].,2019,(02):321-328.[doi:doi:10.3969/j.issn.1000-4440.2019.02.012]
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湿地生境下土壤砷形态转化与微环境因子的关系()
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江苏农业学报[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2019年02期
页码:
321-328
栏目:
耕作栽培·资源环境
出版日期:
2019-04-30

文章信息/Info

Title:
The relationship between soil arsenic speciation transformation and microenvironment factors in wetland habitats
作者:
任伟1; 赵蓉1; 刘云根1; 2; 杨桂英1; 2; 赵立君1; 张慧娟1; 李梦莹1; 王妍1
（1.西南林业大学生态与水土保持学院，云南昆明650224；2.西南林业大学水科学与工程中心，云南昆明650224）
Author(s):
REN Wei1; ZHAO Rong1; LIU Yun-gen1; 2; YANG Gui-ying1; 2; ZHAO Li-jun1; ZHANG Hui-juan1; LI Meng-ying1; WANG Yan1
(1.College of Ecology and Soil & Water Conservation, Southwest Forestry University, Kunming 650224, China;2.Research Center of Water Science and Engineering, Southwest Forestry University, Kunming 650224, China)
关键词:
砷; 微环境因子; 结合态; 环境风险
Keywords:
arsenic; microenvironment factor; binding state; environmental risk
分类号:
X53
DOI:
doi:10.3969/j.issn.1000-4440.2019.02.012
文献标志码:
A
摘要:
通过持续淹水种植典型挺水植物香蒲（Typha angustifolia L.）的模拟湿地生境盆栽试验，探究外源砷（As）污染土壤在不同时间内微环境因子[溶解氧含量（DO）、氧化还原电位（Eh）、电导率（EC）和pH值]的变化规律及砷形态转化的过程和影响因素，并评估对应的环境风险。结果表明，土壤微环境因子对不同处理时间的响应存在差异，随着试验时间延长土壤DO值、Eh值均表现出先降低后升高的趋势；土壤酸碱度趋于中性，且不同处理间没有显著差异；土壤电导率逐渐上升。随着淹水时间的延长，非专性吸附态As（F1）及残渣态As（F5）含量均不断减少，晶型铁铝氧化物结合态As（F4）不断增加，由生物有效态向非生物有效态转化，基本趋于稳定。土壤微环境因子对土壤As结合态的影响是多方向的，同一微环境因子对不同结合态具有不同相关性，且存在较大差异，Eh、DO及pH均对土壤中As的转化具有重要贡献。随着试验时间加长，土壤中As的环境风险表现出先大幅降低后小幅增加的趋势，中后期总体处于中低环境风险状态。
Abstract:
A pot experiment was conducted to study the variation of micro-environmental factors (dissolved oxygen content, oxidation reduction potential, conductivity and pH) and the process and influencing factors of arsenic speciation transformation in soil with different treatments of exogenous arsenic at different time by typical wetland plant Typha angustifolia L. in simulated wetland habitat. The changes and transformation of arsenic species and influencing factors was explored, and assessment of the corresponding environmental risks was conducted. The results showed that the response of soil micro-environment factor to different treatment time was different. The soil dissolved oxygen content(DO) value and oxidation reduction potential(Eh) value decreased first and then increased with the extension of test time. The soil pH tended to be neutral, and there was no significant difference between different treatments. The soil conductivity increased gradually. With the prolongation of waterlogging time, the contents of non-specific adsorption state As (F1) and the residue state As (F5) were decreased continuously, and the crystal form of iron-aluminum oxide bound state As (F4) was increased, and the transformation from biologically effective state to non-biologically effective state was basically stable. Soil microenvironment factors affected the distribution of soil As binding states in multiple directions. The same microenvironment factors had different correlations with different binding states, and there were great differences. Eh, DO and pH all had important contributions to the conversion of As in soil. With the increase of test time, the environmental risk of As in the soil showed a trend of decreasing sharply at first and then increasing slightly, and it was in the middle and low environmental risk state from the middle to the end of the experiment.

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备注/Memo

备注/Memo:
收稿日期：2018-10-08 基金项目：国家自然科学基金项目（41761098、21767027、31560147）；云南省教育厅科学研究基金项目（2018Y121） 作者简介：任伟（1992-），男，硕士研究生，主要研究方向湿地生态修复。（E-mail）renweiswfc2017@163.com 通讯作者：王妍，（E-mail）wycaf@126.com
更新日期/Last Update: 2019-05-05