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- W1972785601 abstract "The sensitivities of Phragmites soil-plant core and litter nitrogenase activity were assayed by the acetylene reduction assay method. Acetylene reduction activity (ARA) of soil-plant cores incubated under ambient O2 concentration, increased with increasing pC2H2 up to 0.20 atm. A Km of 1.05 atm and Vax of 234 nmol C2H2g−1h−1 were calculated. The highest rates of ARA overall occurred in the 8–16 cm zone. Within the core profile, mean rates varied with depths: 0–8, 8–16 and 16–20 cm, and incubation pO2. In the 0–8 cm zone, ARA at pO2 0.0, 0.10 and 0.20 atm did not differ significantly, but in the 8–16 and 16–20 cm zones, the highest rates were obtained at pO2 0.0 atm. A lag of approximately 5 h preceded linear rates of litter ARA in time course assays. Change from aerobic to anaerobic atmospheres and the reverse substantially reduced core and excised root ARA for a period. Core ARA increased with incubation temperature between 0 and 20°C; mean rates were the same at 20 and 25°C. ARA, numbers of diazotrophs, soil temperature, pH and Eh showed a seasonal pattern of variability. The highest rates of ARA were obtained between mid May and June; peak numbers of diazotrophs were counted between June and mid July. Variations in soil pH were slight, but the most obvious change (6.3–7.5) occurred when the soil was warmest and most reduced." @default.
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- W1972785601 date "1991-01-01" @default.
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- W1972785601 title "Some observations on the oxygen sensitivity and seasonal variations of the nitrogenase activity associated with excised soil-plant cores of Phragmites australis (Cav.) Trin." @default.
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- W1972785601 doi "https://doi.org/10.1016/0304-3770(91)90002-m" @default.
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