Abstract

Hydrophilic-hydrophobic properties of organic matter and the content and distribution of water-soluble organic matter (WSOM) in soils of the Subpolar Urals are discussed. It is shown that the type of predominant vegetation in the system of altitudinal zones controls the amount and nature of soil organic matter (SOM). The litter of moss–lichen vegetation of the alpine tundra is enriched in hydrophobic compounds (up to 24.0%). In the grass communities of the subalpine zone, hydrophilic fractions of the SOM predominate (first fraction, 42.4–77.0%; second fraction, 0.3–12.6%). Woody vegetation of the mountainous forest zone is specified by an increased content of hydrophobic lignin-containing fractions (16.4–34.8%). Permafrost-affected soils of the alpine tundra are characterized by an increased hydromorphism leading to the accumulation of compounds associated with Fe and Al (up to 75.4%) in mineral horizons. The calculation of the WSOM carbon stock indicates that it reaches 0.3 to 9% of the total carbon stock in the soil profiles.

中文翻译：

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亚极地乌拉尔土壤的两亲性和水溶性有机物

摘要

讨论了有机质的亲水-疏水特性以及亚极地乌拉尔土壤中水溶性有机质 (WSOM) 的含量和分布。结果表明，海拔带系统中优势植被的类型控制着土壤有机质 (SOM) 的数量和性质。高山苔原的苔藓地衣植被的凋落物富含疏水化合物（高达 24.0%）。在亚高山带的草群落中，SOM 的亲水部分占主导地位（第一部分，42.4-77.0%；第二部分，0.3-12.6%）。山地森林区的木本植被由含有疏水性木质素的组分（16.4-34.8%）的含量增加而确定。受永久冻土影响的高山苔原土壤的特点是水形作用增加，导致与铁和铝相关的化合物（高达 75.4%）在矿物层中积累。WSOM 碳库的计算表明它达到了土壤剖面中总碳库的 0.3% 到 9%。