Pedosphere 30(4): 528--534, 2020
ISSN 1002-0160/CN 32-1315/P
©2020 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Soil physicochemical and microbial drivers of temperature sensitivity of soil organic matter decomposition under boreal forests
Beata KLIMEK1, Marcin CHODAK2, Małgorzata JAŹWA3, Hamed AZARBAD1, Maria NIKLIŃSKA1
1Institute of Environmental Sciences, Faculty of Biology, Jagiellonian University, Gronostajowa 7, Kraków 30-387(Poland)
2Department of Management and Protection of Environment, AGH University of Science and Technology, Mickiewicza 30, Kraków 30-059(Poland)
3Institute of Biology, Faculty of Natural Sciences and Technology, University of Opole, Oleska 22, Opole 45-052(Poland)
Corresponding Author:Beata KLIMEK
ABSTRACT
      Soil organic matter (SOM) in boreal forests is an important carbon sink. The aim of this study was to assess and to detect factors controlling the temperature sensitivity of SOM decomposition. Soils were collected from Scots pine, Norway spruce, silver birch, and mixed forests (O horizon) in northern Finland, and their basal respiration rates at five different temperatures (from 4 to 28℃) were measured. The Q10 values, showing the respiration rate changes with a 10℃ increase, were calculated using a Gaussian function and were based on temperature-dependent changes. Several soil physicochemical parameters were measured, and the functional diversity of the soil microbial communities was assessed using the MicroRespTM method. The temperature sensitivity of SOM decomposition differed under the studied forest stands. Pine forests had the highest temperature sensitivity for SOM decomposition at the low temperature range (0-12℃). Within this temperature range, the Q10 values were positively correlated with the microbial functional diversity index (Hmic') and the soil C-to-P ratio. This suggested that the metabolic abilities of the soil microbial communities and the soil nutrient content were important controls of temperature sensitivity in taiga soils.
Key Words:  CO2 evolution,global warming,microbial functional diversity,MicroRespTM,Q10 metabolic coefficient
Citation: Klimek B, Chodak M, Jaźwa M, Azarbad H, Niklińska M. 2020. Soil physicochemical and microbial drivers of temperature sensitivity of soil organic matter decomposition under boreal forests. Pedosphere. 30(4): 528–534.
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