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Effects of vegetation regime on denitrification potential in two tropical volcanic soils

✍ Scribed by Robert P. Griffiths; Bruce A. Caldwell; Phillip Sollins

Publisher: Springer
Year: 1993
Tongue: English
Weight: 551 KB
Volume: 16
Category: Article
ISSN: 0178-2762
DOI: 10.1007/bf00361400

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✦ Synopsis

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~, Kjeldahl N, and total C. In all plots, denitrification rates were stimulated by the removal of 0 2 and by the addition of glucose but not by the addition of water or NO~-.

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