Effect of Temperature on the Intensity of the Biogenic Decomposition of Aspen Bark

Kurganova, I.N.; Lopes de Gerenyu, V.O.; Galibina, N.A.; Kapitsa, E.A.; Shorohova, E.V.

Авторы: Kurganova I.N., Lopes de Gerenyu V.O., Galibina N.A., Kapitsa E.A., Shorohova E.V.
Журнал: Contemporary Problems of Ecology
Том: 13
Номер: 6
Год издания: 2020
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 663
Последняя страница: 673
DOI: 10.1134/s1995425520060086
Аннотация: Under temperate climatic conditions, temperature is a key abiotic factor that controls the decompositionof coarse woody debris including bark. Using aspen bark (AB), we have carried out a 12-month laboratoryexperiment at three contrasting temperatures (2, 12, and 22°C) and constant sufficient moisture toquantify the temperature effect on the decomposition rate (DecR) and decay constant (k) of aspen bark. Theeffect of temperature on the total loss of C–CO2 and changes in the chemical composition of AB throughoutthe experiment are also estimated. An increase in the incubation temperature from 2 to 12°C and from 12 to22°C induces a similar increase in the average (over 12 months) value of the DecR: the Q10 values are 1.30and 1.41 in these temperature intervals, respectively. The most significant effect of temperature on the DecRdynamics is revealed during the 1st and 2nd months of the experiment. The maximum losses of C–CO2(284 ± 16 mg C g bark–1, or 55.2 ± 3.2% of the initial C content) are observed at 22°C. The decay constantsof AB, calculated by the one-component exponential model, significantly increase with the growth of theincubation temperature: from 0.46 ± 0.01 yr–1 at 2°C to 1.02 ± 0.09 yr–1 at 22°C. Changes in the chemicalcomposition of aspen bark due to the processes of biogenic decomposition include a significant reduction inthe amount of alcohol-soluble organic compounds and cellulose to 18–32 and 41–57% of their initialamount, respectively. Lignin losses are less significant, being only 9–18% of their content in AB before theincubation. The quantitative changes in the chemical composition of aspen bark are similar at 2 and 12°C andless pronounced than those at 22°C, which may be explained by an increase in the growing activity of organisms,are actively involved in bark decomposition at 22°C.
Добавил в систему: Курганова Ирина Николаевна

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Effect of Temperature on the Intensity of the Biogenic Decomposition of Aspen Barkстатья

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