The effects of natural and human disturbances on soil nitrogen dynamics and trace gas fluxes in a Puerto Rican wet forest

PA Steudler, JM Melillo, RD Bowden, MS Castro… - Biotropica, 1991 - JSTOR
PA Steudler, JM Melillo, RD Bowden, MS Castro, AE Lugo
Biotropica, 1991JSTOR
We examined the effects of two disturbances (Hurricane Hugo and forest clearcutting) on
soil nitrogen dynamics and on the exchanges of N _2 O, CO _2, and CH _4 between soils
and the atmosphere of a subtropical wet forest in Puerto Rico. The disturbances resulted in
prolonged increases in ammonium pools and short-term increases in rates of net N-
mineralization and net nitrification. Nitrous oxide emissions increased following both
disturbances. The most dramatic increase was observed 4 mo after clearcutting; N _2 O …
We examined the effects of two disturbances (Hurricane Hugo and forest clearcutting) on soil nitrogen dynamics and on the exchanges of NO, CO, and CH between soils and the atmosphere of a subtropical wet forest in Puerto Rico. The disturbances resulted in prolonged increases in ammonium pools and short-term increases in rates of net N-mineralization and net nitrification. Nitrous oxide emissions increased following both disturbances. The most dramatic increase was observed 4 mo after clearcutting; NO emissions (109 49 N/m-hr) from the cut plot were about two orders of magnitude higher than emissions from the reference plot (1.71 N/m-hr). Carbon dioxide emissions from both disturbed plots (mean 102.47 mg C/m-hr) were about 30 percent lower than the reference (mean 15 1.28 mg C/m-hr). Soils at all sites were generally sinks for CH. Methane uptake, however, was suppressed by both disturbances. This suppression may be related to disturbance-induced changes in the nitrogen cycle, as we have previously observed in temperate zone forests.
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