Abstract

The purpose of the work is a comparative study of the molecular composition of thermolabile (volatilizes at 300°C) and thermostable (volatilizes at 500°C) fractions of organic matter from humus horizons of typical chernozems by double-shot pyrolysis followed by gas chromatographic separation and mass detection of the products. The objects of the study are typical chernozems under different land use types differing in the prevalent trends of organic matter transformation. As is shown, polysaccharides, furfural, and methylfurfural are the major contributors to the pyrolysis products of the chernozem thermolabile matter. The largest share of the pyrolysis products of thermostable matter belongs to nitrogen-containing compounds. It is demonstrated for the first time that the principal component analysis of the data on molecular composition of thermolabile organic matter makes it possible to divide the studied chernozems under different land uses into the groups reflecting the quasi-equilibrium state of soil organic matter, its degradation, or accumulation.

中文翻译：

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不同土地利用下黑钙土的热不稳定和热稳定有机物质

摘要

该工作的目的是通过两次热解然后气相色谱法对典型黑钙质腐殖质视野中的热不稳定（在300°C挥发）和热稳定（在500°C挥发）的有机物的分子组成进行比较研究。产品的分离和质量检测。研究的对象是不同土地利用类型下典型的黑钙土，其有机物转化的普遍趋势不同。如图所示，多糖，糠醛和甲基糠醛是黑钙质热不稳定物质热解产物的主要贡献者。热稳定物质的热解产物中最大份额属于含氮化合物。