Cycling downwards - dissolved organic matter in soils
Cycling downwards - dissolved organic matter in soils
复制标题
DOI：
10.1016/j.soilbio.2012.04.002
复制
发表时间：
2012-09-01
影响因子：
9.7
通讯作者：
Kalbitz, Karsten
中科院分区：
文献类型：
--
作者：
Kaiser, Klaus;Kalbitz, Karsten
溶解的有机物被认为是可移动的，因此对于金属、污染物以及土壤中养分的转移至关重要。我们提出了溶解有机物随土壤水垂直运动的概念模型，该模型偏离了沿流动路径的色谱剥离的观点。它假定改变的化合物暂时固定（吸附或共沉淀），然后进行微生物处理，并重新释放（通过解吸或溶解）到土壤水中。所提出的方案解释了土壤中溶解有机物以及固相有机物的年龄和组成的井深趋势。它解决了土壤有机质在土壤剖面最年轻的部分（深层矿物底土）中最古老的悖论。 (C) 2012 Elsevier Ltd. 保留所有权利。
Dissolved organic matter has been recognized as mobile, thus crucial to translocation of metals, pollutants but also of nutrients in soil. We present a conceptual model of the vertical movement of dissolved organic matter with soil water, which deviates from the view of a chromatographic stripping along the flow path. It assumes temporal immobilization (sorptive or by co-precipitation), followed by microbial processing, and re-release (by desorption or dissolution) into soil water of altered compounds. The proposed scheme explains well depth trends in age and composition of dissolved organic matter as well as of solid-phase organic matter in soil. It resolves the paradox of soil organic matter being oldest in the youngest part of the soil profile - the deep mineral subsoil. (C) 2012 Elsevier Ltd. All rights reserved.