Factors limiting microbial N2O and CO2 production in a cultivated peatland overlying an acid sulphate subsoil derived from black schist

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Mäkelä , M , Kabir , K M J , Kanerva , S , Yli-Halla , M & Simojoki , A 2022 , ' Factors limiting microbial N2O and CO2 production in a cultivated peatland overlying an acid sulphate subsoil derived from black schist ' , Geoderma , vol. 405 , 115444 . https://doi.org/10.1016/j.geoderma.2021.115444

Title: Factors limiting microbial N2O and CO2 production in a cultivated peatland overlying an acid sulphate subsoil derived from black schist
Author: Mäkelä, Minna; Kabir, Kazi Md. Jahangir; Kanerva, Sanna; Yli-Halla, Markku; Simojoki, Asko
Other contributor: University of Helsinki, Environmental Soil Science
University of Helsinki, Department of Soil and Environmental Sciences, University of Barishal, Bangladesh
University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Department of Agricultural Sciences



Date: 2022-01-01
Language: eng
Number of pages: 13
Belongs to series: Geoderma
ISSN: 0016-7061
DOI: https://doi.org/10.1016/j.geoderma.2021.115444
URI: http://hdl.handle.net/10138/334860
Abstract: Factors limiting the production of the greenhouse gases nitrous oxide (N2O) and carbon dioxide (CO2) were investigated in three incubation experiments conducted with soil from top- and subsoil horizons of a peatland which had an acid sulphate mineral subsoil derived from black schists. The effect of moisture was investigated by equilibrating undisturbed soil samples from three horizons (H-2, Cg and Cr) at -10, -60 or -100 cm matric potential and measuring the gas production. In the second experiment, the effects of temperature and various substrates were studied by incubating disturbed soil samples in aerobic conditions at 5 or 20 degrees C, and measuring basal respiration and N2O production before and after adding water, glucose or ammonium into the soil. In the third experiment, the effects of added glucose and/or nitrate on the denitrification in soil samples from four horizons (H1, H2, Cg and Cr were investigated by acetylene inhibition and monitoring of N2O production during a 48-h anaerobic incubation. The production of CO2 in the topmost peat horizon was largest at -10 cm matric potential, and it was larger than those in the mineral subsoil also at -60 and -100 cm potentials. In contrast, drainage seemed to increase N2O production, whereas in the wettest condition the production of N2O in the mineral subsoil was small and the peat horizon was a sink of N2O. Lowering of temperature (from 20 degrees C to 5 degrees C) decreased CO2 production, as expected, but it had almost no role in the production of N2O in aerobic conditions. Glucose addition increased the aerobic production of CO2 in peat, but it had a minor effect in the mineral horizons. Lack of C source (glucose) was limiting anaerobic N2O production in the uppermost peat horizon, while in all other horizons, nitrate proved to be the most limiting factor. It is concluded that peatlands with black schist derived acid sulphate subsoil horizons, such as in this study, have high microbial activity in the peaty topsoil horizons but little microbial activity in the mineral subsoil. These findings are contrary to previous results obtained in sediment-derived acid sulphate soils.
Subject: 415 Other agricultural sciences
Nitrous oxide
Carbon dioxide
Basal respiration
Substrate induced gas production
Denitrification
Peat
Black schist
Acid sulphate soil
NITROUS-OXIDE EMISSIONS
ACETYLENE INHIBITION
SOIL DENITRIFICATION
CARBON-DIOXIDE
WATER
NITRIFICATION
REDUCTION
IMPACTS
TOPSOIL
AVAILABILITY
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