Spatio-Temporal Distribution and Ecological Risk Assessment for Herbicide and Its Metabolites in Baima River

Ye Dunyu; Sun Xiaoyin; Zhao Zhongqiang; Sun Jiayao

doi:10.13961/j.cnki.stbctb.2022.03.011

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Spatio-Temporal Distribution and Ecological Risk Assessment for Herbicide and Its Metabolites in Baima River

- Spatio-Temporal Distribution and Ecological Risk Assessment for Herbicide and Its Metabolites in Baima River
- Bulletin of Soiland Water Conservation Vol. 42, Issue 3, Pages: 74-81(2022)
- 作者机构：
  
  1. 曲阜师范大学地理与旅游学院,山东,日照,276826
  2. 南四湖湿地生态与环境保护山东省高校重点实验室,山东,日照,276826
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.03.011
  CLC： X171.5
- Published：2022
- 稿件说明：
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Ye Dunyu, Sun Xiaoyin, Zhao Zhongqiang, et al. Spatio-Temporal Distribution and Ecological Risk Assessment for Herbicide and Its Metabolites in Baima River[J]. Bulletin of Soiland Water Conservation, 2022, 42(3): 74-81.
DOI：

Ye Dunyu, Sun Xiaoyin, Zhao Zhongqiang, et al. Spatio-Temporal Distribution and Ecological Risk Assessment for Herbicide and Its Metabolites in Baima River[J]. Bulletin of Soiland Water Conservation, 2022, 42(3): 74-81. DOI： 10.13961/j.cnki.stbctb.2022.03.011.

摘要

[目的] 探讨典型除草剂阿特拉津（ATR）及其代谢产物脱乙基阿特拉津（DEA）、脱异丙基阿特拉津（DIA）在作物生长季（6—9月）的污染特征以及时空变化，为农业小流域除草剂的管理、使用与保护决策提供科学依据。[方法] 在白马河流域沿程设立18个采样点，基于实地监测和室内分析，探讨污染物的时空变化特征，并运用熵值法进行生态风险评价。[结果] ①所有采集水样中均有ATR及代谢产物检出，其中ATR在6—7月的地表水样中100%检出，8—9月检出率稍有下降，代谢产物DEA，DIA在前两月检出率较低，后两月检出率增加。②白马河污染物空间分布表明，各污染物浓度最高值大多出现于河流上游和中游，下游浓度均相对较低。这可能与河流下游河道宽阔、水流量大、稀释作用较强有关。③生态风险评价结果显示ATR，DEA和DIA风险等级均为中等，其原因是该河流的水负荷低，稀释能力不足。[结论] 相对于大流域，白马河作为典型农业流域的小支流，水量小、稀释能力不足，造成污染的生态风险高于许多大流域。

Abstract

[Objective] The spatio-temporal variations of a typical herbicide (atrazine

ATR) and its degradation products[deethylatrazine (DEA) and deisopropylatrazine (DIA)] during the crop growing season (June to September) was investigated in order to provide scientific supports for management

usage

and protection of herbicides in a small agricultural watershed.[Methods] Eighteen sampling sites were designated along the Baima River

and the spatio-temporal dynamics of pollutants were obtained through the combined methods of field monitoring and lab analysis. Ecological risk was evaluated by the risk of herbicides quotient method.[Results] ① ATR and its metabolites were detected in all of the collected water samples. ATR detection rates in surface water samples in June and July were higher than those in August and September. However

the detection rates of metabolites including DEA and DIA were low in the first two months and increased in the later two months. ② The spatial distribution of herbicide pollution in the Baima River showed that the maximum values of pollutants mainly occurred in the upper and middle reaches of the river. The concentration levels in the lower reaches were relatively low

which may be attributed to the wide river channel

large water flow

and strong dilution effect in the lower reaches of the river. ③ The risk levels of ATR

DEA

and DIA for the entire river were all at the moderate level due to low water load and insufficient dilution capacity of the river.[Conclusion] Compared with larger watersheds

the Baima River

as a small tributary of typical agricultural watersheds

has small water volume and insufficient dilution capacity that results in higher ecological pollution risks than many larger basins.

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