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- W2023559058 abstract "Fluxes of CO 2 and CH 4 were determined by a static chamber technique at eight drained swamp peatland sites, with crop and forest covers. Over a 6‐ month period (May ‐ October, 1991), CH 4 fluxes ranged from −5 to 7 mg CH 4 m −2 d −1 and were not correlated with either soil temperature or water table position. Integrated seasonal emissions were −0.40 to 0.04 g CH 4 m −2 over 147 days; the sites with a forest or grass cover were a small sink of CH 4 whereas the sites with horticultural crops showed no significant flux. Laboratory incubations showed that the highest CH 4 consumption rates (3 to 9 μg CH 4 g −1 d −1 ) occurred in the least disturbed soils. The results, when compared with CH 4 fluxes from nearby swamps which have been unaffected by drainage, suggest that drainage of temperate peatlands has reduced emissions of CH 4 to the atmosphere by 0.6 ‐ 1 × 10 12 g CH 4 yr −1 . CO 2 fluxes ranged from 0 to 16 g CO 2 m −2 d −1 and were correlated with the seasonal pattern of temperature in the upper part of the soil profile. Integrated seasonal fluxes for the sites in which root respiration was an unimportant contribution were 0.6 ‐ 0.8 kg CO 2 m −2 over 181 days. Aerobic laboratory incubations revealed CO 2 production rates of 0.2 ‐ 1.4 mg CO 2 g −1 d −1 , an average of 5 times the rate under anaerobic conditions. Using bulk density and loss‐on‐ignition data, we found that the seasonal CO 2 fluxes translate into surface lowering of the peat of about 2 mm yr −1 , whereas the commonly observed lowering in these cultivated peatlands is 20 mm yr −1 . These data suggest that processes other than direct oxidation, such as shrinkage and aeolian erosion, are the major contributor to the surface lowering of the peat." @default.
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- W2023559058 date "1993-06-01" @default.
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- W2023559058 title "Carbon dioxide and methane fluxes from drained peat soils, southern Quebec" @default.
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- W2023559058 doi "https://doi.org/10.1029/93gb00469" @default.
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