Soil respiration is a very important factor
influencing carbon deposition in peat and reflecting the intensity of
soil organic matter decomposition, root respiration, and the ease of
transporting gases to the surface. Carbon dioxide release from
three different peat soil profiles (0-80 cm) of the Polesie Lubelskie
Region (Eastern Poland) was analyzed under laboratory conditions.
Peat samples were incubated at 5, 10, and 20°C in aerobic
and anaerobic environments, and their CO2-evolution was analyzed
up to 14 days. The respiration activity was found to be in the
range of 0.013-0.497 g CO2 kg-1 DW d-1. The respiratory quotient
was estimated to be in the range of 0.51-1.51, and the difference in
respiration rates over 10°C ranged between 4.15 and 8.72 in
aerobic and from 1.15 to 6.53 in anaerobic conditions. A strong
influence of temperature, depth, the degree of peat decomposition,
pH, and nitrate content on respiration activity was found. Lack of
oxygen at low temperature caused higher respiration activity than
under aerobic conditions. These results should be taken into
account when the management of Polish peatlands is considered in
the context of climate and carbon storage, and physicochemical
properties of soil in relation to soil respiration activity are
considered.
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