Rapidly growing tropical trees mobilize remarkable amounts of nitrogen, in ways that differ surprisingly among species

dc.contributor.author Raich, James
dc.contributor.author Russell, Ann
dc.contributor.author Raich, James
dc.contributor.author Russell, Ann
dc.contributor.department Natural Resource Ecology and Management
dc.date 2018-02-15T23:36:04.000
dc.date.accessioned 2020-06-30T06:14:00Z
dc.date.available 2020-06-30T06:14:00Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2012
dc.date.embargo 2015-03-12
dc.date.issued 2012-06-01
dc.description.abstract <p>Fast-growing forests such as tropical secondary forests can accumulate large amounts of carbon (C), and thereby play an important role in the atmospheric CO2 balance. Because nitrogen (N) cycling is inextricably linked with C cycling, the question becomes: Where does the N come from to match high rates of C accumulation? In unique experimental 16-y-old plantations established in abandoned pasture in lowland Costa Rica, we used a mass-balance approach to quantify N accumulation in vegetation, identify sources of N, and evaluate differences among tree species in N cycling. The replicated design contained four broad-leaved evergreen tree species growing under similar environmental conditions. Nitrogen uptake was rapid, reaching 409 (±30) kg⋅ha−1⋅y−1, double the rate reported from a Puerto Rican forest and greater than four times that observed at Hubbard Brook Forest (New Hampshire, USA). Nitrogen amassed in vegetation was 874 (±176) kg⋅ha−1, whereas net losses of soil N (0–100 cm) varied from 217 (±146) to 3,354 (±915) kg⋅ha−1 (<em>P</em> = 0.018) over 16 y. Soil C:N, δ13C values, and N budgets indicated that soil was the main source of biomass N. In <em>Vochysia guatemalensis</em>, however, N fixation contributed >60 kg⋅ha−1⋅y−1. All species apparently promoted soil N turnover, such that the soil N mean residence time was 32–54 y, an order of magnitude lower than the global mean. High rates of N uptake were associated with substantial N losses in three of the species, in which an average of 1.6 g N was lost for every gram of N accumulated in biomass.</p>
dc.description.comments <p>This is a manuscript of an article in <em>Proceedings of the National Academy of Sciences </em>109 (2012): 10398, doi:<a href="http://dx.doi.org/10.1073/pnas.1204157109" target="_blank">10.1073/pnas.1204157109</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/nrem_pubs/93/
dc.identifier.articleid 1093
dc.identifier.contextkey 6825558
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath nrem_pubs/93
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/56439
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/nrem_pubs/93/2012_Russell_RapidlyGrowingTropical.pdf|||Sat Jan 15 02:31:04 UTC 2022
dc.source.uri 10.1073/pnas.1204157109
dc.subject.disciplines Ecology and Evolutionary Biology
dc.subject.disciplines Forest Biology
dc.subject.disciplines Natural Resources Management and Policy
dc.subject.keywords carbon sequestration
dc.subject.keywords forest regrowth
dc.subject.keywords nitrogen cycle
dc.subject.keywords soil organic nitrogen
dc.subject.keywords species effects
dc.title Rapidly growing tropical trees mobilize remarkable amounts of nitrogen, in ways that differ surprisingly among species
dc.type article
dc.type.genre article
dspace.entity.type Publication
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relation.isAuthorOfPublication fe48194d-87da-48ed-abec-5b0c213da52e
relation.isOrgUnitOfPublication e87b7b9d-30ea-4978-9fb9-def61b4010ae
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