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Testing a conceptual model of soil emissions of nitrous and nitric oxides

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In this article we briefly review the disciplinary research on soil emissions of N2O and NO. We describe a mechan i s ti c a lly based con ceptual model—the “h o l e - i n - t h e - pipe” (HIP) model (Firestone and Davidson 1989)—that integrates the results of these disciplinary studies and that relates emissions of both nitrogen oxides to common soil processes. We then test the model predictions using data from our recent studies in Costa Rica (Veldkamp et al. 1999) Brazil (Verchot et al.1999)and Puerto Rico (Erickson etal. in press) and additional data from the literature for forest ecosystems throughout the world.

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