Effect of addition of various carbon substrates on denitrification in a vertic Mollisol

Abstract. Nitrous oxide production was measured in intact cores taken from active pasture and old-growth forest Inceptisols in the Atlantic Lowlands of Costa Rica. Following additions of aqueous KNO, or glucose, or the two combined amendments, the cores were incubated in the laboratory to determine if N,O production rates were either N-limited or C-limited in the two land use types. Differences in rates of denitrification (N,O + N, production) among amended forest and pasture soils were determined by addition of 10% GH,.The forest soils were relatively insensitive to all amendment additions, including the acetylene block. Forest N,O production rates among the treatments did not differ from the controls, and were consistently lower than those of'the pasture soils. With the addition of glucose plus nitrate to the forest soils, production of N,O was three times greater than the controls, although this increase was not statistically significant. On the other hand, the pasture soils were definitely nitrogen-limited since N,O production rates were increased substantially beyond controls by all the amendments which contained nitrate, despite the very low N level (5 mg N kg-' soil) relative to typical fertilizer applications. With respect to the nitrate plus glucose plus acetylene treatment, denitrification was high in the pasture soils; N,O production in the presence of C,H, was 150% of the rate of N,O production measured in the absence of the acetylene block. The results are discussed in relation to the effects of agricultural land use practices and subsequent impacts of disturbance on N,O retease.

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Nitrate limitation of N2O production and denitrification from tropical pasture and rain forest soils

Parsons

Mitre

Keller

et al. 1993

Biogeochemistry

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Nitrogen and oxygen isotope ratios of nitrous oxide emitted from soil and produced by nitrifying and denitrifying bacteria

Webster

Hopkins

1996

Biol Fertil Soils

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Saccharidic compounds as soil redox effectors and their influence on potential N2O production

1996

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Effect of addition of various carbon substrates on denitrification in a vertic Mollisol

Cited by 12 publications

References 9 publications

Nitrate limitation of N2O production and denitrification from tropical pasture and rain forest soils

Nitrate limitation of N2O production and denitrification from tropical pasture and rain forest soils

Nitrogen and oxygen isotope ratios of nitrous oxide emitted from soil and produced by nitrifying and denitrifying bacteria

Saccharidic compounds as soil redox effectors and their influence on potential N2O production

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