Multiple measurements constrain estimates of net carbon exchange by a Eucalyptus forest

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dc.contributor.authorKeith, Heather
dc.contributor.authorLeuning, Ray
dc.contributor.authorJacobsen, Kris L
dc.contributor.authorCleugh, Helen A
dc.contributor.authorvan Gorsel, Eva
dc.contributor.authorRaison, R John
dc.contributor.authorMedlyn, Belinda E.
dc.contributor.authorWinters, Anthony
dc.contributor.authorKeitel, Claudia
dc.date.accessioned2015-12-10T22:18:56Z
dc.date.issued2009
dc.date.updated2016-02-24T10:50:04Z
dc.description.abstractNet ecosystem exchange of carbon (FNEE) was estimated for a temperate broadleaf, evergreen eucalypt forest ecosystem at Tumbarumba in south-eastern Australia to investigate the processes controlling forest carbon sinks and their response to climate. Measurements at a range of temporal and spatial scales were used to make three different estimates of FNEE based on: (1) the difference between fluxes of carbon input by photosynthesis and output by autotrophic plus heterotrophic respiration, (2) changes over time in the carbon pools in the above- and below-ground biomass, soil and litter, and (3) micrometeorological flux measurements that provide a continuous estimate of the net exchange. A rigorous comparison of aggregated component fluxes and the net eddy fluxes within a flux tower source area was achieved based on an inventory of the site and a detailed sampling strategy. Measurements replicated in space and time provided mean values, confidence limits and patterns of variation of carbon pools and fluxes that allowed comparisons within known limits of uncertainty. As a result of comparisons between nighttime eddy flux and chamber measurements of respiration, a revised micrometeorological method was developed for estimating nighttime carbon flux using flux tower measurements. Uncertainty in the final estimate of FNEE was reduced through mutual constraints of each of these measurement approaches. FNEE for the period October 2001-September 2002, with average rainfall, was an uptake of 6.7 (5.1-8.3) tC ha-1 yr-1 estimated from component fluxes, and 5.4 (3.0-7.5) tC ha-1 yr-1 estimated from the revised eddy flux method. Biomass increment was 4.5 (3.7-5.4) tC ha-1 yr-1 and the remaining 0.9-2.2 tC ha-1 yr-1 could represent a carbon sink in the soil and litter pools or lie within the confidence limits of the measured fluxes. FNEE was reduced to -0.1 to 2.4 tC ha-1 yr-1 during a period of drought and insect disturbance in October 2002-September 2003, with biomass increment being the main component reduced. The forest is a large carbon sink compared with other forest ecosystems, but this is subject to high-annual variability in response to climate variability and disturbance.
dc.identifier.issn0168-1923
dc.identifier.urihttp://hdl.handle.net/1885/51624
dc.publisherElsevier
dc.sourceAgricultural and Forest Meteorology
dc.subjectKeywords: carbon emission; estimation method; evergreen forest; measurement method; net ecosystem exchange; respiration; Australasia; Australia; New South Wales; Tumbarumba; Eucalyptus; Hexapoda Biosphere-atmosphere interaction; Carbon budget; Carbon sinks; Ecosystem respiration; Net ecosystem exchange
dc.titleMultiple measurements constrain estimates of net carbon exchange by a Eucalyptus forest
dc.typeJournal article
local.bibliographicCitation.lastpage558
local.bibliographicCitation.startpage535
local.contributor.affiliationKeith, Heather, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationLeuning, Ray, CSIRO
local.contributor.affiliationJacobsen, Kris L, CSIRO
local.contributor.affiliationCleugh, Helen A, CSIRO
local.contributor.affiliationvan Gorsel, Eva , CSIRO Marine and Atmospheric Research
local.contributor.affiliationRaison, R John, CRC for Greenhouse Accounting
local.contributor.affiliationMedlyn, Belinda E., Macquarie University
local.contributor.affiliationWinters, Anthony, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationKeitel, Claudia, College of Medicine, Biology and Environment, ANU
local.contributor.authoremailu3690676@anu.edu.au
local.contributor.authoruidKeith, Heather, u3690676
local.contributor.authoruidWinters, Anthony, u9815046
local.contributor.authoruidKeitel, Claudia, u4143994
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor050101 - Ecological Impacts of Climate Change
local.identifier.absfor050102 - Ecosystem Function
local.identifier.absfor060203 - Ecological Physiology
local.identifier.ariespublicationU4279067xPUB228
local.identifier.citationvolume149
local.identifier.doi10.1016/j.agrformet.2008.10.002
local.identifier.scopusID2-s2.0-59249087704
local.identifier.thomsonID000264079700013
local.identifier.uidSubmittedByU4279067
local.type.statusPublished Version

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