|
ИСТИНА |
Войти в систему Регистрация |
ИПМех РАН |
||
Lignin transformation in soils under the impact of soil plowing and drainageтезисы доклада
- Авторы: Kovaleva Natalia O., Kovalev Ivan V.
- Сборник: The Book of Abstracts of the International Conference “Natural Organic Matters geochemical flows and properties: from theory to practice” (HUMIC)
- Тезисы
- Год издания: 2019
- Место издания: University of Latvia Riga
- Первая страница: 59
- Последняя страница: 60
- Аннотация: Lignin is one of the difficultly decomposable compounds of plant tissues. The content and composition of lignin phenols that are the main matrix for the humus formation in Agrosoils affect greatly the transformation their organic matter. The aim of this work was a detailed characterization of the lignin phenols composition and processes of their transformation in soils under the impact of soil plowing and drainage in dynamic during last 30 years. The objects of investigation were Agrogray soils of the Moscow district, where an experimental reclamation test arable area was created in 1987 (in three variants for each impact). The process of lignin determination in the soils included the alkaline oxidation of a sample using copper oxide at 170°C under the pressure in a nitrogen medium. The lignin phenols were divided by a gas-liquid chromatograph. It has been established that, the yield of agricultural crops has always been lower in non-drained land than in drained soils. In the average humidity years, the yield of spring crops due to the use of drainage was higher by 10-12%, of winter crops - by 18-20%. The total lignin content decreased from 13 mg/g Corg in drained soils up to 9.0 mg/g Corg - in non-drained soils as a result of increased microbiological activity. Microbial activity is diagnosed by increasing the length of the fungal mycelium from 84 to 120 m/g, and biomass from 0.033 to 0.050 mg/g. However, in drained soils, the degree of biopolymer oxidation (the ratio of acid to aldehydes) increases. According to the values of the lignin/N ratio in Agrosoils, there is also an accumulation of metabolic carbon in humic acids over aromatic carbon. Drainage caused a deep transformation of lignin in the Fe-Mn nodules.
- Добавил в систему: Ковалев Иван Васильевич