Spatial Distribution of the Components of Carbon Cycle in Soils of Forest Ecosystems of the Northern, Middle, and Southe
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CHEMISTRY
Spatial Distribution of the Components of Carbon Cycle in Soils of Forest Ecosystems of the Northern, Middle, and Southern Taiga of Western Siberia A. A. Bobrika, *, O. Yu. Goncharovaa, G. V. Matyshaka, I. M. Ryzhovaa, M. I. Makarova, and M. V. Timofeevaa aLomonosov
Moscow State University, Moscow, 119991 Russia *е-mail: [email protected]
Received January 28, 2020; revised April 20, 2020; accepted April 24, 2020
Abstract—In the course of studies in typical forest ecosystems of the northern, middle, and southern taiga of Western Siberia performed at the peak of the growing season, the spatial variation of soil CO2 emissions and their relationships with the content of extractable and microbial soil carbon and soil hydrothermic parameters were estimated. The studied parameters of the soil carbon cycle are characterized by the high spatial variability in all the studied ecosystems. This fact indicates the need for a detailed investigation of the greenhouse gas soil emission in all ecosystems typical of a given natural zone. There is a statistically significant difference between the soils of the green-moss pine forests and the soils of the lichen pine forest of the northern taiga. In the green-moss pine forest, the carbon content of microbial biomass is 1.5 times higher (195 ± 24 and 127 ± 16 mg C/kg soil, respectively), the content of extractable carbon is 4 times higher (157 ± 25 and 41 ± 5 mg C/kg of soil, respectively), and the CO2 emission is 1.7 times higher (324 ± 20 and 190 ± 10 mg CO2/(m2 h), respectively) than those in the lichen pine forest. In the northern taiga zone, carbon dioxide emissions from soils in the green-moss pine forests are largely determined by the soil temperature; the role of soil moisture is less significant. In the soils of lichen pine forests, the CO2 emission is mainly controlled by the content of extractable carbon. Significant factors influencing the soil СО2 emission in forest ecosystems of the taiga zone are the content of extractable and microbial carbon and hydrothermic parameters of the soils. Keywords: CO2 emission, extractable carbon, carbon of microbial biomass, Podzols DOI: 10.1134/S1064229320110058
INTRODUCTION The key to understanding the global carbon cycle is the assessment of soil CO2 emissions as an integral indicator of the soil biological activity [28, 31, 33, 36, 39, 41, 43]. The main goal of the recent studies into this issue is the modelling of the consequences of global climate change with a model sensitivity assessment based on various parameters (soil properties, hydrothermal, biological, and other factors). In this regard, the quantitative assessment of the content and reserves of the components of the soil carbon cycle, including the soil carbon emission, is an important task [4, 13, 28, 41]. Generally, such assessments are based on soil maps and rare databases [21, 28]. Investigations into the spatial variability of greenhouse gas emissions and organic carbon stocks in soils of boreal and arctic ecosystems are few in number, though they are c
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