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- W2058129826 abstract "Summary Laboratory experiments were conducted to elucidate the variation of CH4 oxidation pattern in three different soils (rhizosphere, bulk and bare) of a dryland rice (Oryza sativa L. cultivar Narendra-118) field. The rhizosphere soil exhibited strongest CH4 oxidation activity and the bare soil the weakest. Control soils (no N-fertilization) exhibited higher capacity for CH4 oxidation than N-fertilized soils. Above conclusions were supported by measurements of MOB (methane oxidizing bacteria) population size, NH4+-N concentration (as a potential inhibitor of CH4 oxidation), soil moisture content and kinetic parameters (Km and Vmax) for the same conditions. MOB population size was significantly higher in the rhizosphere (548.6 × 105 cells g−1) than bulk (459.1 × 105 cells g−1) and bare (38.3 × 105 cells g−1) soils. The MOB population size was highest in control (418.8 × 105 cells g−1) followed by NH4Cl (359.2 × 105 cells g−1) NH4NO3 (323 × 105 cells g−1), and urea (293.7 × 105 cells g−1) treated soils. NH4+-N concentration was the highest in bare soil (10.5 μg g−1) followed by bulk (8.8 μg g−1) and rhizosphere (6.8 μg g−1) soil. Urea treated soil had maximum NH4+-N (10.1 μg g−1) and control soil the minimum (6.3 μg g−1). Apparent half saturation constant (Km) and maximum oxidation rate (Vmax) increased significantly from bare to bulk to rhizosphere in control as well as fertilized soil. Km ranged from 4.79 to 139.50 μg g−1 dry soil, and Vmax from 0.04 to 0.60 μg h−1 g−1 dry soil. These differences in kinetic parameters might be due to differential species composition of CH4 oxidizing community and/or conditioning of MOB to different soil microenvironments. This study has demonstrated competitive inhibition effect of NH4+-N on CH4 oxidation, which is relatively less strong for rhizospheric MOB due to root associated processes. Es wurden Laborexperimente durchgefuhrt, um die Variation des CH4-Oxidationsmuster bei drei verschiedenen Boden (Rhizosphare, offen, bearbeitet) eines Reisfeldes (Oryza sativa L. cultivar Narendra-118) im Trockenanbau zu erhellen. Der Rhizospharenboden entfalteten die starkste CH4-Oxidationsaktivitat, offene Boden die geringste. Die Kontrollboden (ohne N-Dungung) zeigten eine hoher Kapazitat fur die CH4-Oxidation als die N-gedungten Boden. Die oben genannten Schlussfolgerungen wurden durch die Messungen der Populationsgrose der MOB (methanoxidierende Bakterien), der Bodenfeuchte und der kinetischen Parameter (Km und Vmax) unter gleichen Bedingungen gestutzt. Die MOB-Populationsgrose war signifikant groser bei den Rhizospharenboden (548.6 × 105 Zellen g−1) als bei den bearbeiteten (459.1 × 105 Zellen g−1) und offenen Boden (38,3 × 105 Zellen g−1). Die MOB-Populationsgrose in den Boden war am hochsten bei den Kontrollen (418.8 × 105 Zellen g−1), gefolgt von den mit NH4Cl (359.2 × 105 Zellen g−1), mit NH4NO3 (323 × 105 Zellen g−1) und den mit Harnstoff (293.7 × 105 Zellen g−1) behandelten Boden. Die NH4+-N-Konzentration war bei den offenen Boden am hochsten (10.5 g μg−1), gefolgt von den bearbeiteten (8.8 μg g−1) und den Rhizospharenboden (6.8 μg g−1). Der mit Harnstoff behandelte Boden hatte maximalen (10.1 μg g−1) und der Kontrollboden minimalen (6.3 μg g−1) NH4-N. Die Michaelis-Konstante (Km) und die maximale Oxidationsrate (Vmax) nahmen vom offenen uber den bearbeiteten bis zum Rhizospharenboden sowohl bei den Kontrollen als auch den gedungten Boden signifikant zu. Km variierte von 4.79 bis 139.50 μg g−1 trockener Boden und Vmax von 0.04 bis 0.60 μg g−1 trockener Boden. Diese Unterschiede in den kinetischen Parametern konnten auf die differentielle Artenzusammensetzung der CH4-oxidierenden Lebensgemeinschaft und/oder die Konditionierung der MOB auf unterschiedliche Bodenmikroumwelten zuruck zu fuhren sein. Diese Studie hat einen konkurrierenden, hemmenden Effekt von NH4+-N auf die CH4-Oxidation gezeigt, der aufgrund der mit den Wurzeln assoziierten Prozesse relativ weniger stark fur rhizospharische MOB gilt." @default.
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- W2058129826 date "2002-01-01" @default.
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- W2058129826 title "Differential inhibition of CH4 oxidation in bare, bulk and rhizosphere soils of dryland rice field by nitrogen fertilizers" @default.
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- W2058129826 doi "https://doi.org/10.1078/1439-1791-00119" @default.
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