Abstract

The composition of water-soluble organic matter (WSOM) of coniferous- deciduous, coniferous, and moss litter was studied. Litter type affects the composition of WSOM. Sphagnum litter contains less N and dissolved organic carbon (DOC), but more carbohydrates, the WSOM from this litter is characterized by the lowest extinction coefficients Е₂₅₄. WSOM from mixed litter with a predominance of birch litter had a maximum content of N and a small amount of soluble phenolic (SP) substances. WSOM from litter of pine needles differ from the rest by having a lower content of carbohydrates, the maximum amount of SP and hydrophobic fractions. All investigated WSOM were characterized by high rates of decomposition: half-decomposition time of their stable fractions was 2–4 months. WSOM from pine litter at pH ~ 6.5 were absorbed by the BF horizon of iron–illuvial podzol, starting from the concentration of DOC of 100 mg/L. Substances from birch–spruce litter were adsorbed insignificantly under similar conditions.

中文翻译：

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凋落物组成对其水溶性有机物特性的影响

摘要

研究了针叶-落叶，针叶和苔藓凋落物的水溶性有机物（WSOM）的组成。垃圾类型影响WSOM的组成。水藓垫料包含N个以下，并且溶解的有机碳（DOC），但更多的碳水化合物，来自该垫料WSOM的特征在于最低消光系数е ₂₅₄。以桦木屑为主的混合垃圾中的WSOM具有最大的N含量和少量的可溶性酚（SP）物质。松针窝中的WSOM与其余不同，其碳水化合物含量较低，SP和疏水性组分的含量最高。所有研究的WSOM均具有高分解率的特征：其稳定级分的半分解时间为2-4个月。从DOC浓度为100 mg / L开始，铁-小河pod唑的BF层吸收pH值为6.5的松树凋落物的WSOM。在相似的条件下，桦木云杉凋落物的物质吸附不明显。