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Biogeochemical processes along a nutrient gradient in a tropical ombrotrophic peatland

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dc.contributor.author Sjoegersten, Sofie en
dc.contributor.author Cheesman, Alexander W. en
dc.contributor.author Lopez, Omar en
dc.contributor.author Turner, Benjamin L. en
dc.date.accessioned 2011-08-11T13:56:46Z
dc.date.available 2011-08-11T13:56:46Z
dc.date.issued 2011
dc.identifier.citation Sjoegersten, Sofie, Cheesman, Alexander W., Lopez, Omar, and Turner, Benjamin L. 2011. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F16822">Biogeochemical processes along a nutrient gradient in a tropical ombrotrophic peatland</a>." <em>Biogeochemistry</em>. 104 (1-3):147&ndash;163. <a href="https://doi.org/10.1007/s10533-010-9493-7">https://doi.org/10.1007/s10533-010-9493-7</a> en
dc.identifier.issn 0168-2563
dc.identifier.uri http://hdl.handle.net/10088/16822
dc.description.abstract Biogeochemical properties, including nutrient concentrations, carbon gas fluxes, microbial biomass, and hydrolytic enzyme activities, were determined along a strong nutrient gradient in an ombrotrophic peatland in the Republic of Panama. Total phosphorus in surface peat decreased markedly along a 2.7 km transect from the marginal Raphia taedigera swamp to the interior sawgrass swamp, with similar trends in total nitrogen and potassium. There were parallel changes in the forest structure: basal area decreased dramatically from the margins to the interior, while tree diversity was greatest at sites with extremely low concentrations of readily-exchangeable phosphate. Soil microbial biomass concentrations declined in parallel with nutrient concentrations, although microbes consistently contained a large proportion (up to 47%) of the total soil phosphorus. Microbial C:P and N:P ratios and hydrolytic enzyme activities, including those involved in the cycles of carbon, nitrogen, and phosphorus, increased towards the nutrient-poor wetland interior, indicating strong below-ground nutrient limitation. Soil CO2 fluxes and CH4 fluxes did not vary systematically along the nutrient gradient, although potential soil respiration determined on drained soils was lower from nutrient-poor sites. Soil respiration responded strongly to drainage and increased temperature. Taken together, our results demonstrate that nutrient status exerts a strong control on above and below-ground processes in tropical peatlands with implications for carbon dynamics and hence long term development of such ecosystems. en
dc.relation.ispartof Biogeochemistry en
dc.title Biogeochemical processes along a nutrient gradient in a tropical ombrotrophic peatland en
dc.type Journal Article en
dc.identifier.srbnumber 101240
dc.identifier.doi 10.1007/s10533-010-9493-7
rft.jtitle Biogeochemistry
rft.volume 104
rft.issue 1-3
rft.spage 147
rft.epage 163
dc.description.SIUnit Peer-Reviewed en
dc.description.SIUnit STRI en
dc.citation.spage 147
dc.citation.epage 163

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