Eurasian Soil Science ( IF 1.4 ) Pub Date : 2022-04-22 , DOI: 10.1134/s1064229322040111 V. A. Krylov 1 , V. G. Mamontov 1
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Abstract
The study of labile humic substances of typical chernozems under different land uses in Kursk oblast with the help of thermal method attests to their complex composition with participation of aliphatic and cyclic structures heterogeneous in terms of their thermal stainability. According to the Z coefficient (the ratio between weight losses in the low-temperature (<400°С) and high-temperature region (>400°С)) equal to 1.10, aliphatic compounds predominate over cyclic benzenoid compounds in the composition of labile humic substances of virgin chernozems. Under the impact of permanent cultivation of winter wheat and corn, the mineralization of the aliphatic part of labile humic substances increases, and the Z coefficient decreases to 0.81–0.96. The most intense mineralization of aliphatic fragments of labile humic substances occurs under the impact of permanent black fallow, where the Z coefficient decreases to 0.76, and inert cyclic components clearly predominate in the composition of labile humic substances. In 23 years after the conversion of the permanent black fallow into the overgrown unmanaged fallow, the composition of the labile humic substances of the typical chernozem has not undergone significant changes, though a tendency for an increase in the role of aliphatic structures has been noted.
中文翻译：
不同原生代对库尔斯克州典型黑钙土不稳定腐殖质热特性的影响
摘要
借助热法对库尔斯克州不同土地用途下典型黑钙土的不稳定腐殖质的研究证明了它们的复杂组成，其中脂肪族和环状结构的参与在其热染色性方面是异质的。根据Z系数（低温（<400°С）和高温区域（>400°С）的重量损失之比）等于 1.10，在原始的不稳定腐殖质的组成中，脂肪族化合物比环状苯类化合物占优势黑钙土。在冬小麦和玉米永久种植的影响下，不稳定腐殖质的脂肪族部分矿化增加，Z系数下降至0.81~0.96。不稳定腐殖质的脂肪族碎片最强烈的矿化发生在永久黑色休耕的影响下，其中Z系数降低至0.76，惰性循环组分在不稳定腐殖质的组成中明显占主导地位。在永久的黑色休耕转变为杂草丛生的无人管理的休耕后的 23 年，
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