Response of sorption processes of MCPA to the amount and origin of organic matter in a long-term field experiment
Response of sorption processes of MCPA to the amount and origin of organic matter in a long-term field experiment
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DOI：
10.1046/j.1365-2389.2001.00382.x
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发表时间：
2001-06-01
影响因子：
4.2
通讯作者：
Lischka, H
中科院分区：
文献类型：
--
作者：
Haberhauer, G;Pfeiffer, L;Lischka, H
长期以来，耕作方式的变化会影响MCPA（4-氯-2-甲基苯氧基）乙酸）的吸附行为。通过长期田间试验，研究了不同有机质含量和来源的土壤对2甲4氯的吸附-解吸机理。土壤有机质的来源似乎对MCPA的吸附行为至关重要。土壤样品修改与污水污泥吸附MCPA更强烈地比任何其他处理下的土壤。施用有机肥处理的土壤中氮素含量最高，其次是施用畜禽粪、绿色肥、无氮无机肥和休闲土。有机质的碳含量和来源对吸附都很重要。土壤碳含量的降低并不一定意味着对极性有机酸如MCPA的吸附能力的降低。然而，我们的吸附-解吸实验表明，随着碳含量的降低，矿物吸附机制的作用可能变得更加明显。结果表明，土壤有机质和矿物的相互作用对MCPA的吸附特性有明显的影响。
Changes in farming practices over long times can affect the sorption behaviour of MCPA ((4-chloro-2-methylphenoxy)acetic acid). We studied the adsorption-desorption mechanisms of MCPA on soil with Varied amounts and origins of soil organic matter obtained from a long-term field experiment with various organic amendments. The origin of the soil organic matter seems to be crucial for the sorption behaviour of MCPA. Samples of soil amended with sewage sludge sorbed MCPA more strongly than the soil under any other treatment. Feat-amended soil was second followed by sail receiving animal manure, green manure, mineral fertilizer without N and the fallowed soil. Both the carbon content and the origin of the organic matter are important for the sorption. A decrease of carbon content of a soil does not necessarily imply a reduction of sorption capacity for polar organic acids such as MCPA. Nevertheless, our adsorption-desorption experiments suggest that with decreasing carbon content the role of mineral sorption mechanisms could become more pronounced. Our results showed that interactions of soil organic matter and soil minerals distinctly influence adsorption properties for MCPA.