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Metabolic and Environmental Control on Methane Emission from Soils: Mechanistic Studies of Mesotrophic Fen in West Siberia 总被引:1,自引:0,他引:1
Panikov Nicolai S. Dedysh Svetlana N. Kolesnikov Oleg M. Mardini Alla I. Sizova Maria V. 《Water, Air, & Soil Pollution: Focus》2001,1(5-6):415-428
The biological mechanisms regulating methane emission fromnatural wetlands are the focus of this article. A novel techniqueprovides estimates of the distribution of CH4 sources withinan undisturbed soil profile by recording the transient gasdynamics after soil enclosure by deep (50 cm) chamber. Thecombined use of conventional surface and soil chambers across a200-m fen transect allowed us to relate the observed methaneemission to its instant generation and uptake. Surprisingly, themethane generation was relatively constant (9–12 mg CH4-C hr-1 m-2) and highly variable net emission (0.2–20 mg CH4-C hr-1 m-2) was closely correlated (r = –0.809)with methane uptake. In laboratory incubations, CH4 uptakefollowed Michaelis-Menten kinetics. Added chloride and nitrateirrespective of the cation's nature suppressed uptake as a strongnoncompetitive inhibitors (K
i 0.5 mM). The methaneformation turned out to be unstable and under anaerobicincubation, the formation of CH4, CO2 andH2displayed sustained weekly oscillations. We conclude that effectsof environmental factors alone are not sufficient topredict the variation in emission, which depends also on metabolic control of respective soil organisms. The multitude ofsuch controls is dependent on diversity of respective soilorganisms and could be grouped into a limited number ofcategories considerably simplifying large-scale simulations. 相似文献
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