Abstract

The experiments on mobilization of soil organic matter during soil washing with ultrafresh water against the background of salinity pulsing were designed and performed. Unpolluted soil and the soil artificially polluted with copper(II) were used in experiments, namely, clay loamy typical chernozem (Haplic Chernozem) of the Alekhin Central Chernozemic Nature Reserve (Kursk oblast, Russia; 51°34.207 N, 36°05.444 E) and sandy loamy soddy-podzolic soil (Albic Glossic Retisol (Loamic, Cutanic, Ochric)) from the Domodedovo district of Moscow oblast, Russia (55°17.683 N, 37°50.045 E). Soil samples were taken from the upper humus-accumulative (A1) horizon (5–15 cm). A drastic change in the composition of washing solution from fresh water to 0.1 M NaCl solution and back led to destruction of soil aggregates under the impact of osmotic pressure. Soddy-podzolic soil proved to be more resistant to destruction as compared with typical chernozem. Copper(II) was leached off from artificially contaminated samples of soddy-podzolic soil with the flow of dissolved organic matter, whereas copper leaching from typical chernozem was associated with the destruction of aggregates and release of intraaggregate organic matter. It is argued that copper (II) migration models should take into account the amount of dissolved organic matter for soddy-podzolic soil and the content of aromatic fragments in the organic matter for typical chernozem. A conceptual model of the Cu(II) leaching from contaminated soddy-podzolic soil and typical chernozem in the course of soil washing with fresh water against the background of salinity pulsing and the destruction of soil structure is constructed.

中文翻译：

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超淡水对土壤有机物的迁移作用：对重金属迁移率影响的建模和评估

摘要

设计并进行了在盐度脉冲背景下用超淡水冲洗土壤过程中土壤有机质动员的实验。实验采用未污染土壤和人工污染铜（II）土壤，即Alekhin中央黑钙土自然保护区（俄罗斯库尔斯克州；51°34.207 N，36°05.444 E）的黏壤土典型黑钙土（Haplic Chernozem）和来自俄罗斯莫斯科州多莫杰多沃区（北纬 55°17.683，东经 37°50.045）的沙质壤质软质灰化土（Albic Glossic Retisol（Loamic、Cutanic、Ochric））。土壤样品取自上部腐殖质累积 (A1) 层 (5-15 cm)。在渗透压的影响下，洗涤液的组成从淡水到 0.1 M NaCl 溶液的剧烈变化导致土壤团聚体的破坏。与典型的黑钙土相比，草质灰化土壤被证明更能抵抗破坏。铜（II）随着溶解有机质的流动从人为污染的草质灰化土壤样品中浸出，而从典型黑钙土中浸出的铜与聚集体的破坏和内部有机质的释放有关。有人认为，铜 (II) 迁移模型应考虑黄腐土的溶解有机质含量和典型黑钙土有机质中芳香碎片的含量。构建了在盐度脉动和土壤结构破坏的背景下，在淡水冲洗土壤过程中，从受污染的黄腐土和典型黑钙土中浸出铜（II）的概念模型。