Methane emission from a landfill and the methane oxidising capacity of its covering soil
Methane emission from a small covered landfill site showed, seasonally varying fluxes, ranging from −5.9 to 914.3 mg CH 4 m −2 d −1. The moisture content of the CH 4-oxidising cover soil was thought to cause this variation. Comparing gross and net CH 4 emission rates, it was found that the cover soi...
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Published in | Soil biology & biochemistry Vol. 28; no. 10; pp. 1397 - 1405 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
01.10.1996
New York, NY Elsevier Science |
Subjects | |
Online Access | Get full text |
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Summary: | Methane emission from a small covered landfill site showed, seasonally varying fluxes, ranging from −5.9 to 914.3 mg CH
4 m
−2 d
−1. The moisture content of the CH
4-oxidising cover soil was thought to cause this variation. Comparing gross and net CH
4 emission rates, it was found that the cover soil, due to its CH
4 oxidising capacity, had a large mitigating effect on the CH
4 emission. In laboratory experiments the effects of soil moisture, temperature and different ammonium amendments on CH
4 oxidation were investigated. When the moisture content and temperature were combined, CH
4 oxidation rates between 0.88 and 10.86 ng CH
4 g
−1 h
−1 were observed. The optimum moisture content ranged between 15.6 and 18.8% w/w (
±1
2
WHC
). The optimum incubation temperature (30-20°C) decreased with increasing moisture contents. For the oxidation rates at 10 and 20°C, we found an average
Q
10 value of 1.88 ± 0.14. The activation energy for moisture contents between 5 and 25% was 83.0 ± 4.4 kJ mol
−1. Increased ammonium additions reduced the CH
4-oxidising capacity. This reduction decreased with increasing moisture contents. A high correlation (R
2 > 0.98) was found between the moisture content and the reduction of the CH
4 uptake rate mg
−1 NH
4
+ −N kg
−1 added. Because the nitrification rate was also lower at higher moisture contents, it was thought that the CH
4 oxidation rate was more closely connected with the NH
4
+ turnover rate than with its actual concentration. Multiple linear regression analysis of the CH
4 oxidation rates under the different incubation conditions showed the following decreasing effect on the CH
4-oxidising capacity of the soil: amount of NH
4
+ added > moisture content > incubation temperature. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0038-0717 1879-3428 |
DOI: | 10.1016/S0038-0717(96)00147-2 |