| Autor: |
Pertti J. Martikainen, Anne Saari, Riikka Rinnan |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
Soil Biology and Biochemistry. 36:1037-1046 |
| ISSN: |
0038-0717 |
| DOI: |
10.1016/j.soilbio.2004.01.018 |
| Popis: |
In soil incubation experiments we examined if there are differences in the kinetic parameters of atmospheric methane (CH 4 ) oxidation in soils of upland forests and forested peatlands. All soils showed net uptake of atmospheric CH 4 . One of the upland forests included also managed (clear-cut with or without previous liming or N-fertilization) study plots. The CH 4 oxidation in the forested peat soil had a higher K m (510 μl l −1 ) and V max (6.2 nmol CH 4 cm −3 h −1 ) than the upland forest soils ( K m from 5 to 18 μl l −1 and V max from 0.15 to 1.7 nmol CH 4 cm −3 h −1 ). The forest managements did not affect the K m -values. At atmospheric CH 4 concentration, the upland forest soils had a higher CH 4 oxidation activity than the forested peat soil; at high CH 4 concentrations the reverse was true. Most of the soils oxidised CH 4 in the studied pH range from 3 to 7.5. The pH optimum for CH 4 oxidation varied from 4 to 7.5. Some of the soils had a pH optimum for CH 4 oxidation that was above their natural pH. The CH 4 oxidation in the upland forest soils and in the peat soil did not differ in their sensitivities to (NH 4 ) 2 SO 4 or K 2 SO 4 (used as a non-ammonium salt control). Inhibition of CH 4 oxidation by (NH 4 ) 2 SO 4 resulted mainly from a general salt effect (osmotic stress) though NH 4 + did have some additional inhibitory properties. Both salts were better inhibitors of CH 4 oxidation than respiration. The differences in the CH 4 oxidation kinetics in the forested peat soil and in the upland forest soils reveal that there are differences in the physiologies of the CH 4 oxidisers in these soils. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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