You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Effects of Natural and Human Disturbances on Soil Nitrogen Dynamics and Trace Gas Fluxes in a Puerto Rican Wet Forest
P. A. Steudler, J. M. Melillo, R. D. Bowden, M. S. Castro and A. E. Lugo
Vol. 23, No. 4, Part A. Special Issue: Ecosystem, Plant, and Animal Responses to Hurricanes in the Caribbean (Dec., 1991), pp. 356-363
Published by: Association for Tropical Biology and Conservation
Stable URL: http://www.jstor.org/stable/2388252
Page Count: 8
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
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 emissions (109 49 $\mu g$ N/m$^2$-hr) from the cut plot were about two orders of magnitude higher than emissions from the reference plot (1.71 $\mu g$ N/m$^2$-hr). Carbon dioxide emissions from both disturbed plots (mean 102.47 mg C/m$^2$-hr) were about 30 percent lower than the reference (mean 15 1.28 mg C/m$^2$-hr). Soils at all sites were generally sinks for CH$_4$. 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.
Biotropica © 1991 Association for Tropical Biology and Conservation