Heterotrophic Soil Respiration Response to the Summer Precipitation Regime and Different Depths of Snow Cover in a Temperate Continental Climate

Khoroshaev, D.A.; Kurganova, I.N.; Lopes de_Gerenyu, V.O.

Авторы: Khoroshaev D.A., Kurganova I.N., Lopes de_Gerenyu V.O.
Журнал: Eurasian Soil Science
Том: 56
Номер: 11
Год издания: 2023
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 1667
Последняя страница: 1682
DOI: 10.1134/S1064229323601932
Аннотация: Precipitation and temperature regimes are the key factors that regulate the rate of decompositionof soil organic matter in terrestrial ecosystems. The aim of this study was to assess the effect of the duration of dry periods in summer and different depths of snow cover in winter on heterotrophic soil respiration. The studies were carried out as part of a two-year field simulation experiment on gray soil (Haplic Luvisol) under the temperate continental climate (south of Moscow oblast). Three variants were forecasted:(1) simulation of mild weather with uniform irrigation of the soil in summer and the absence of freezing in winter, (2) simulation of two summer dry periods lasting 1–2 months with natural winter snow cover (control), (3) simulation of extreme weather with one long (~3 months) dry period in summer and complete removal of snow cover in winter. Heterotrophic soil respiration was measured by the closed chamber method on bare fallow during two years of continuous experiment and one year after its completion. Median values of heterotrophic soil respiration for the entire period of the experiment in the three abovementioned variants of the experiment were 38, 27 and 19 mg C/(m2 × h), respectively. Two short dry periods led to an increase in heterotrophic soil respiration by 7–10%, which is associated both with the drying and rewetting cycles of the soil and with an increase in the mean summer temperature of a 20-cm soil layer by 1.5°C. The prolonged dry period caused a decrease in heterotrophic soil respiration by 12–16% as a result of low soil moisture content. Soil freezing led to a strong decrease in winter heterotrophic soil respiration, which reached 34–55% in the control variant and 57–72% when the snow cover was removed. The frosty period (November–March) contributed 25–34% and 14–19% without and with soil freezing, respectively, to the annual CO2 flux from the soil. It was concluded that the lack of soil freezing caused by an increase in the depth of snow cover led to a more significant change in the annual heterotrophic soil respiration than the lack of precipitation in the summer season.
Добавил в систему: Курганова Ирина Николаевна

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Heterotrophic Soil Respiration Response to the Summer Precipitation Regime and Different Depths of Snow Cover in a Temperate Continental Climateстатья

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