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首页> 外文会议>220th American Chemical Society, Meeting 2000 Washington, D.C. >Environmental Fate of Fluometuron in a Mississippi Delta Lake Watershed
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Environmental Fate of Fluometuron in a Mississippi Delta Lake Watershed

机译：密西西比河三角洲流域Fluometuron的环境命运

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The Mississippi Delta Management Systems Evaluation (MSEA) Project was established to assess management practices for restoring soil and water quality. This paper reviews part of our research consisting of field-scale characterizations of soil properties and their relation to fluometuron degradation and sorption to soil, the role of best management practices (e.g., vegetative strips, riparian zones) in minimizing off-land fluometuron movement, and herbicide concentrations in surface water. Surface (0-5 cm) soil samples were collected in an oxbow lake watershed (Beasley) (60-m spaced grids, 40 ha). Soils were characterized and fluometuron sorption assessed. Based on characterizations, areas representative of different soil series were sampled to evaluate fluometuron dissipation under field conditions. Geostatistical analysis of soil characteristics showed significant spatial dependence, reflecting variability in the alluvial soils. Fluometuron sorption was correlated positively with organic carbon (OC) and clay, and negatively with sand content. Half-lives for fluometuron dissipation from the surface 0 to 5 cm ranged from 12 to 25 days. Fluometuron dissipation was correlated with both clay (positive) and sand content (negative), but not OC. The primary metabolite, desmethyl fluometuron (DMFM) was observed, usually 2 to 3 weeks after herbicide application and occurred in greater concentrations in clay soil. Both fluometuron and DMFM were observed in lake water, appearing one month (June) after field application, and were below detectable limits in October. These studies indicate that fluometuron and its major metabolite have limited persistence in both soil and surface water of the watershed studied.
机译：密西西比三角洲管理系统评估（MSEA）项目的建立是为了评估恢复土壤和水质的管理实践。本文回顾了我们研究的一部分，包括土壤性质的田间尺度表征及其与氟隆隆降解和对土壤的吸附的关系，最佳管理方法（例如，植物带，河岸带）在最大程度减少离岸氟隆隆运动方面的作用，和地表水中的除草剂浓度。在oxbow湖流域（Beasley）（60米间隔的网格，40公顷）中收集表面（0-5厘米）土壤样品。对土壤进行了表征并评估了氟美隆的吸附。基于这些特征，对代表不同土壤系列的区域进行了采样，以评估田间条件下氟隆的消散。土壤特征的地统计学分析显示出显着的空间依赖性，反映了冲积土壤的变化性。 Fluometuron吸附与有机碳（OC）和粘土呈正相关，与砂含量呈负相关。氟美隆从表面0到5 cm消散的半衰期为12到25天。 Fluometuron消散与粘土（正）和砂含量（负）相关，而与OC不相关。通常在除草剂施用后2至3周观察到主要代谢产物去甲基氟隆（DMFM），并以较高的浓度存在于粘土中。氟美隆和DMFM均在湖水中观察到，在田间施用后一个月（6月）出现，并在10月低于可检测限。这些研究表明，氟美隆及其主要代谢产物在所研究流域的土壤和地表水中均具有有限的持久性。

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