Effects of vegetation regime on denitrification potential in two tropical volcanic soils |
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Authors: | Robert P Griffiths Bruce A Caldwell Phillip Sollins |
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Institution: | (1) Department of Forest Science, Oregon State University, 97331-7501 Corvallis, OR, USA |
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Abstract: | Effects of vegetation and nutrient availability on potentail denitrification rates were studied in two volcanic, alluvial-terrace soils in lowland Costa Rica that differ greatly in weathering stage and thus in availability of P and base cations. Potential denitrification rates were significantly higher in plots where vegetation had been left undisturbed than in plots where all vegetation had been removed continuously, and were higher on the less fertile of the two soils. The potential denitrification rates were correlated strongly with respiration rates, levels of mineralizable N, microbial biomass, and moisture content, and moderately well with concentrations of extractable NH
inf4
sup+
, Kjeldahl N, and total C. In all plots, denitrification rates were stimulated by the removal of O2 and by the addition of glucose but not by the addition of water or NO
inf3
sup-
.This is Paper 2772 of the Forest Research Laboratory, Oregon State University |
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Keywords: | Denitrification Soil respiration Nitrous oxide Tropical volcanic soils Microbial biomass |
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