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Simulating the dissipation of two herbicides using micro paddy lysimeters

机译：使用微型水稻蒸渗仪模拟两种除草剂的消散

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摘要

A set of packed micro paddy lysimeters, placed in a greenhouse, was used to simulate the dissipation of two herbicides, simetryn and thiobencarb, in a controlled environment. Data from a field monitoring study in 2003, including the soil condition and water balances, were used in the simulation. The herbicides were applied and monitored over a period of 21 d. The water balances under two water management scenarios, intermittent irrigation management (AI) and continuous irrigation management (CI), were simulated. In the AI scenario, the pattern of herbicide dissipation in the surface water of the field were simulated, following the first-order kinetics. In the CI scenario, similarity was observed in most lysimeter and field concentrations, but there were differences in some data points. Dissipation curves of both herbicides in the surface water of the two simulated scenarios were not significantly different (P ＞ 0.05) from the field data except for intercept of the thiobencarb curve in the CI scenario. The distribution of simetryn and thiobencarb in the soil profile after simulation were also similar to the field data. The highest concentrations of both herbicides were found on the topsoil layer at 0-2.5 cm depth. Only a small amount of herbicides moved down to the deeper soil layers. Micro paddy lysimeters are thus a good alternative for the dissipation study of pesticides in the paddy environment.
机译：一组装在温室中的微型稻谷测渗仪用于模拟在受控环境中消灭的两种除草剂，西线虫和硫代苯威。模拟中使用了2003年现场监测研究的数据，包括土壤状况和水平衡。除草剂的施用和监测持续21天。模拟了两种水管理情景下的间歇灌溉管理（AI）和连续灌溉管理（CI）的水平衡。在AI场景中，按照一级动力学模拟了田间地表水中除草剂消散的模式。在CI情景中，在大多数溶血仪和现场浓度中都观察到了相似性，但是在某些数据点上存在差异。在模拟情景中，两种除草剂在地表水中的耗散曲线与现场数据无显着差异（P＞ 0.05），但在CI情景中截留了硫代苯甲酸曲线。模拟后西侧测定和硫代苯甲酸在土壤剖面中的分布也与田间数据相似。在0-2.5 cm深度的表土层上发现了两种除草剂的最高浓度。只有少量的除草剂向下移动到更深的土壤层。因此，微型稻谷测渗仪是研究稻田环境中农药消散的好选择。

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  • 来源
    《Chemosphere》 |2009年第10期|1393-1399|共7页
  • 作者

    Dang Thi Tuyet Nhung; Thai Khanh Phong; Hirozumi Watanabe; Takashi Iwafune; Dang Quoc Thuyet;

  • 作者单位

    Hanoi University of Pharmacy, 13-15 Le Thanh Tong, Hanoi, Viet Nam;

    Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan;

    Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu, Tokyo 183-8509, Japan;

    National Institute for Agro-Environmental Sciences, 3-1-1 Kannondai, Tsukuba, Ibaraki 305-8604, Japan;

    Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu, Tokyo 183-8509, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    simulation; simetryn; thiobencarb; risk assessment; equality of slope and intercept;

    机译：模拟;simetryn;硫代苯威;风险评估;斜率和截距相等;

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