沉水植物对水体阿特拉津迁移的影响

瞿梦洁; 李慧冬; 李娜; 张萌; 朱端卫

文章摘要

瞿梦洁,李慧冬,李娜,张萌,朱端卫.沉水植物对水体阿特拉津迁移的影响[J].农业环境科学学报,2016,35(4):750-756.

沉水植物对水体阿特拉津迁移的影响

The influence of submersed macrophytes on the migration of atrazine in water

投稿时间：2015-11-15

DOI：10.11654/jaes.2016.04.020

中文关键词: 阿特拉津分配沉积物穗花狐尾藻菹草

英文关键词: atrazine distribution sediments Potamogeton crispus Myriophyllum spicatum

基金项目:国家科技重大专项子课题"三峡库区水生态风险阈值及其安全保障方案研究"(2012ZX07103.001);国家自然科学基金项目"菹草驱动的生物钙泵在水/沉积物磷循环中的作用机制研究"(40973056)

作者	单位	E-mail
瞿梦洁	华中农业大学资源与环境学院环境生态工程研究室, 武汉 430070
李慧冬	华中农业大学资源与环境学院环境生态工程研究室, 武汉 430070 山东省农业科学院农业质量标准与检测技术研究所, 济南 250100
李娜	华中农业大学资源与环境学院环境生态工程研究室, 武汉 430070
张萌	华中农业大学资源与环境学院环境生态工程研究室, 武汉 430070
朱端卫	华中农业大学资源与环境学院环境生态工程研究室, 武汉 430070	zhudw@mail.hzau.edu.cn

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中文摘要:

通过研究阿特拉津在武汉市汤逊湖、南湖和荆州市洪湖的沉积物-水体系中分配、吸附和解吸行为,得出阿特拉津在该体系下解吸平衡分配系数K_Pd远大于吸附平衡分配系数K_P,即其滞后解吸行为显著,表明阿特拉津一旦从水中进入沉积物,则很难得以解吸。在此基础上,将南湖沉积物添加阿特拉津淹水培养沉水植物菹草(Potamogeton crispus)和穗花狐尾藻(Myriophyllum spicatum),设置阿特拉津初始浓度为0.1、0.25、0.5 mg·kg^-1,结果表明:两种植物均能直接吸收阿特拉津,在第20 d,初始浓度为0.25mg·kg^-1时,菹草和穗花狐尾藻体内阿特拉津浓度分别为13.4、11.2 mg·kg^-1;两种植物对水体中阿特拉津具有一定的去除作用,培养45 d后,随着浓度的增加,菹草和穗花狐尾藻对根际沉积物中阿特拉津的去除率分别达到92%、86%、91%和84%、82%、90%,至60d时,对上覆水中阿特拉津降解率分别为35.0%、51.3%、1.50%和32.4%、61.8%、0.44%。尽管水体中残留阿特拉津容易被沉积物吸持,但在一定浓度范围内仍可用适当的沉水植物对其进行去除。

英文摘要:

This paper researched the distribution, adsorption and desorption behaviors of atrazine in the sediment-water system of Lake Tangxunhu and Lake Nanhu in Wuhan City, and Lake Honghu in Jingzhou City, China, concluding that K_Pd, the desorption equilibrium distribution coefficient of atrazine in this system, is much higher than the adsorption equilibrium distribution coefficient K_P. In other words, its hysteretic desorption behavior is obvious, and this suggests that atrazine will be hard to desorb once it enters into sediments. On this basis, Potamogeton crispus and Mriophyllum spicatum, two submerged plants that could absorb atrazine, were cultivated in the sediments in Lake Nanhu, and the initial concentration of atrazine was set equal to 0.10 mg·kg^-1, 0.25 mg·kg^-1 and 0.50 mg·kg^-1. Both of the plants can directly absorb atrazine. When the initial concentration equaled 0.25 mg·kg^-1 on the 20th day, the concentration of the atrazine in P. crispus and M. spicatum was equal to 13.4 mg·kg^-1 and 11.2 mg·kg^-1 respectively. Moreover, both plants have a certain removal effect on atrazine in water. After 45 d, as the concentration increased, the removal rate of the atrazine in the sediments by P. crispus and M. spicatum reached 92%, 86% and 91% as well as 84%, 82% and 90%. On the 60 d, the degradation rate of the atrazine in the overlying water reached 35.0%, 51.3% and 1.50% as well as 32.4%, 61.8% and 0.44%. Results show that even though the residue of atrazine in water is easily immobilized by sediments, macrophytes can still be properly applied in a specific concentration range to the removal of atrazine.

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