氧化还原条件对密西西比河泛滥平原土壤中异丙甲草胺和嗪草酮降解的影响

Impact of redox conditions on metolachlor and metribuzin degradation in Mississippi flood plain soils.

作者信息

Mulbach C K, Porthouse J D, Jugsujinda A, DeLaune R D, Johnson A B

机构信息

Wetland Biogeochemistry Institute, Louisiana State University, Baton Rouge 70803, USA.

出版信息

J Environ Sci Health B. 2000 Nov;35(6):689-704. doi: 10.1080/03601230009373302.

DOI:10.1080/03601230009373302

PMID:11069013

Abstract

The effect of soil redox conditions on the degradation of metolachlor and metribuzin in two Mississippi soils (Forrestdale silty clay loam and Loring silt loam) were examined in the laboratory. Herbicides were added to soil in microcosms and incubated either under oxidized (aerobic) or reduced (anaerobic) conditions. Metolachlor and metribuzin degradation under aerobic condition in the Forrestdale soil proceeded at rates of 8.83 ngd(-1) and 25 ngd(-1), respectively. Anaerobic degradation rates for the two herbicides in the Forestdale soil were 8.44 ngd(-1) and 32.5 ngd(-1), respectively. Degradation rates for the Loring soil under aerobic condition were 24.8 ngd(-1) and 12.0 ngd(-1) for metolachlor and metribuzin, respectively. Metolachlor and metribuzin degradation rates under anaerobic conditions in the Loring soil were 20.9 ngd(-1) and 5.35 ngd(-1). Metribuzin degraded faster (12.0 ngd(-1)) in the Loring soil under aerobic conditions as compared to anaerobic conditions (5.35 ngd(-1)).

摘要

在实验室中研究了土壤氧化还原条件对两种密西西比土壤（福雷斯特代尔粉质粘壤土和洛林粉质壤土）中甲草胺和嗪草酮降解的影响。将除草剂添加到微型生态系统中的土壤中，并在氧化（好氧）或还原（厌氧）条件下进行培养。在福雷斯特代尔土壤中，好氧条件下甲草胺和嗪草酮的降解速率分别为8.83 ngd(-1)和25 ngd(-1)。在福雷斯特代尔土壤中，这两种除草剂的厌氧降解速率分别为8.44 ngd(-1)和32.5 ngd(-1)。在洛林土壤中，好氧条件下甲草胺和嗪草酮的降解速率分别为24.8 ngd(-1)和12.0 ngd(-1)。在洛林土壤中，厌氧条件下甲草胺和嗪草酮的降解速率分别为20.9 ngd(-1)和5.35 ngd(-1)。与厌氧条件（5.35 ngd(-1)）相比，嗪草酮在洛林土壤好氧条件下降解得更快（12.0 ngd(-1)）。