Abstract

The water-soluble components originated in coniferous litters desorb into solution the native organic substances from the solid phase of the eluvial horizons of podzols and podzolic soil. In podzols, the water-soluble organic matter (WSOM) extracted from litter and then passing through the E horizons are sorbed by the BFH horizons if their concentration in solution exceeds 35 mg C/L. The sorption ranges from tens to hundreds of milligrams of carbon per kilogram of the BFH horizon. The WSOM can be sorbed by the BT horizons of podzolic soil when the concentration of organic substances in the liquid phase is higher than in podzols. The model experiments with minerals show that kaolinite and illite interact with the soluble substances percolating from the litter and selectively extract more hydrophilic and less aromatic components with relatively low molecular weights. On the contrary, goethite interacts with the WSOM prevalently sorbing hydrophobic components, substances of phenolic nature, components enriched in aromatic carbon, and substances with molecular weights less than 7 kDa. The spectral characteristics of WSOM change after the sorption interaction with minerals: the fluorescence associated with the humus substances with the longest conjugation chain decreases or disappears, while new fluorophores containing fragments of phenolic and/or protein structures emerge. The presence of kaolinite and illite in the eluvial horizons and their interaction with WSOM most likely contribute to the transformation of WSOM composition and appearance of the properties maximally favorable for their sorption on iron hydroxides in the lower horizons.

中文翻译：

---

针叶凋落物的水溶性有机物与矿物质以及坡土和坡土的视界相互作用

摘要

源自针叶凋落物的水溶性成分将土壤中的天然有机物质从豆荚和豆荚土壤的斜坡层的固相中解吸出来。在Podzols中，水溶性有机物（WSOM从垃圾中提取并通过E层的）如果溶液中的浓度超过35 mg C / L，则被BFH层吸收。每公斤BFH层吸附的碳量范围从几十到数百毫克。当液相中有机物的浓度高于Podzols中时，WSOM可以被Podzolic土壤的BT层吸收。用矿物进行的模型实验表明，高岭石和伊利石与从垃圾中渗出的可溶物质发生相互作用，并选择性地提取分子量相对较低的亲水性和芳香性较低的组分。相反，针铁矿与WSOM相互作用，主要吸附疏水性成分，酚类物质，富含芳香族碳的成分以及分子量小于7 kDa的物质。WSOM的光谱特征在与矿物质发生吸附相互作用后发生变化：与具有最长共轭链的腐殖质相关的荧光减弱或消失，同时出现了含有酚和/或蛋白质结构片段的新荧光团。坡地中高岭石和伊利石的存在以及它们与WSOM的相互作用最有可能促进WSOM组成的转变以及其在较低层中最大程度地被氢氧化铁吸附的特性出现。