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首页> 外文期刊>European Journal of Soil Science >Dissolved organic carbon interactions with sorption and leaching of diuron in organic-amended soils.
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Dissolved organic carbon interactions with sorption and leaching of diuron in organic-amended soils.

机译：在有机改良土壤中溶解的有机碳相互作用与敌草隆的吸附和浸出。

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Diuron (N'-[3,4-dichlorophenyl]-N,N-dimethylurea) is one of the most frequently used herbicides in olive groves in Spain and other Mediterranean countries. The main objective of this work was to investigate the effect of the dissolved organic carbon (DOC) from a commercial humic amendment, derived by composting the liquid waste of the olive-mill process (LF), and a solid residue from the olive oil production industry (AL) on the sorption and leaching behaviour of diuron in soil. For this purpose, a clay and a sandy soil were selected. Soil sorption coefficients of diuron increased with LF (32%) and AL (76%) amendment in the sandy soil, whereas sorption decreased in the clay soil upon amendment, especially in the case of the liquid LF (52%). The DOC from LF and AL is composed of very poorly humified molecules, which are strongly sorbed onto the clay soil and thus compete with diuron for the same sorption sites. Dialysis experiments revealed that diuron forms stable complexes with DOC from LF and AL. Leaching of diuron in columns of the sandy soil treated with the organic amendments caused earlier breakthrough and maximum concentration peaks at fewer pore volumes when compared with leaching with 0.01 M CaCl2. Competition between diuron and DOC molecules for sorption sites and diuron-DOC interactions can both account for the enhanced leaching of diuron..
机译：敌草隆（N'-[3,4-二氯苯基] -N，N-二甲基脲）是西班牙和其他地中海国家橄榄树林中最常用的除草剂之一。这项工作的主要目的是研究商业腐殖质修正剂中溶解的有机碳（DOC）的作用，该修正剂是对橄榄磨过程（LF）的液体废料和橄榄油生产中的固体残渣进行堆肥而得工业（AL）研究了敌草隆在土壤中的吸附和浸出行为。为此，选择了粘土和沙土。 LF（32％）和AL（76％）改良剂在沙质土壤中对敌草隆的土壤吸附系数增加，而改良后的黏土土壤吸附力降低，特别是在液态LF（52％）的情况下。来自LF和AL的DOC由非常差的腐化分子组成，这些分子被强烈吸附到粘土上，因此与杜隆竞争相同的吸附位点。透析实验表明，敌草隆与LF和AL中的DOC形成稳定的复合物。与用0.01 M CaCl2浸出相比，用有机​​改良剂处理过的砂土柱中的diuron浸出会导致更早的突破和最大浓度峰，且孔体积较小。敌草隆和DOC分子之间对吸附位点的竞争以及敌草隆与DOC的相互作用都可以解释敌草隆的浸出增强。

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