Decomposition of organic matter in peat soil in a minerotrophic mire |
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| Institution: | 1. Climate and Agriculture Group, Agroscope, Reckenholzstrasse 191, 8046 Zürich, Switzerland;2. Environmental Geosciences, University of Basel, Bernoullistrasse 30, 4056 Basel, Switzerland;3. Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland;4. Oeschger Centre for Climate Change Research, University of Bern, Hochschulstrasse 4, 3012 Bern, Switzerland;1. Soil Science, University of Rostock, Justus-von-Liebig-Weg 6, 18051 Rostock, Germany;2. Canadian Light Source Inc., Saskatoon, Saskatchewan S7N 5A8, Canada |
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| Abstract: | Decomposition of organic materials, oxygen consumption, and carbon dioxide emission were investigated in Masukata mire, a small minerotrophic mire in central Japan. We selected three dominant community types in the mire, a Sphagnum palustre community, a Phragmites australis community, and an Alnus japonica community, for the decomposition study sites. Decomposition rates were measured in the field by examining mass loss of peat and cellulose for 6 months. The oxygen consumption rate was measured in the field using a closed chamber equipped with an oxygen electrode. The carbon dioxide emission rate of the peat was measured by an infrared gas analyser in the laboratory under controlled conditions. Results of these measurements were tested by correlation analysis. The rate of mass loss of peat positively correlated with the CO2 emission rate. The cellulose decomposition rate showed significant differences among community types, and it had significant positive correlation with the oxygen consumption rate. Although oxygen consumption measurement is not generally used to estimate peatland soil respiration, the oxygen consumption method can be used for predicting long-term decomposition rate according to different vegetation types within a short time. |
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