Biotic and abiotic controls on diurnal fluctuations in labile soil phosphorus of a wet tropical forest

Show simple item record Vandecar, KL en Lawrence, D en Wood, T en Oberbauer, SF en Das, R en Tully, K en Schwendenmann, Luitgard en 2016-09-28T23:23:45Z en 2008-12-19 en 2009-09-01 en
dc.identifier.citation Ecology, 90 (9), 2009, 2547-2555 en
dc.identifier.issn 0012-9658 en
dc.identifier.uri en
dc.description.abstract The productivity of many tropical wet forests is generally limited by bioavailable phosphorus (P). Microbial activity is a key regulator of P availability in that it determines both the supply of P through organic matter decomposition and the depletion of bioavailable P through microbial uptake. Both microbial uptake and mineralization occur rapidly, and their net effect on P availability varies with soil moisture, temperature, and soil organic matter quantity and quality. Exploring the mechanisms driving P availability at fine temporal scales can provide insight into the coupling of carbon, water, and nutrient cycles, and ultimately, the response of tropical forests to climate change. Despite the recognized importance of P cycling to the dynamics of wet tropical forests and their potential sensitivity to short-term fluctuations in bioavailable P, the diurnal pattern of P remains poorly understood. This study quantifies diurnal fluctuations in labile soil P and evaluates the importance of biotic and abiotic factors in driving these patterns. To this end, measurements of labile P were made every other hour in a Costa Rican wet tropical forest oxisol. Spatial and temporal variation in Bray-extractable P were investigated in relation to ecosystem carbon flux, soil CO2 efflux, soil moisture, soil temperature, solar radiation, and sap-flow velocity. Spatially averaged bi-hourly (every two hours) labile P ranged from 0.88 to 2.48 μg/g across days. The amplitude in labile P throughout the day was 0.61–0.82 μg/g (41–54% of mean P concentrations) and was characterized by a bimodal pattern with a decrease at midday. Labile P increased with soil CO2 efflux and soil temperature and declined with increasing sap flow and solar radiation. Together, soil CO2 efflux, soil temperature, and sap flow explained 86% of variation in labile P. en
dc.description.uri en
dc.language English en
dc.publisher Ecological Society of America en
dc.relation.ispartofseries Ecology en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from en
dc.rights.uri en
dc.subject Science & Technology en
dc.subject Life Sciences & Biomedicine en
dc.subject Ecology en
dc.subject Environmental Sciences & Ecology en
dc.subject ECOLOGY en
dc.subject Bray-extractable phosphorous en
dc.subject carbon en
dc.subject Costa Rica en
dc.subject P-deficient soils en
dc.subject sap flow en
dc.subject soil CO(2) efflux en
dc.subject tropical wet forest en
dc.subject RAIN-FOREST en
dc.subject ORGANIC-MATTER en
dc.subject LEAF-LITTER en
dc.subject DYNAMICS en
dc.subject CARBON en
dc.subject AVAILABILITY en
dc.subject PRODUCTIVITY en
dc.subject RESPIRATION en
dc.subject TEMPERATURE en
dc.title Biotic and abiotic controls on diurnal fluctuations in labile soil phosphorus of a wet tropical forest en
dc.type Journal Article en
dc.identifier.doi 10.1890/08-1516.1 en
pubs.issue 9 en
pubs.begin-page 2547 en
pubs.volume 90 en
dc.identifier.pmid 19769132 en en
pubs.end-page 2555 en
pubs.publication-status Published en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 117707 en Science en School of Environment en
dc.identifier.eissn 1939-9170 en
pubs.record-created-at-source-date 2016-09-29 en 2009-09-01 en
pubs.dimensions-id 19769132 en

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