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Density loss and respiration rates in coarse woody debris of Pinus radiata, Eucalyptus regnans and Eucalyptus maculata

Mackensen, Jens; Bauhus, Juergen

Description

This study compared field and laboratory decomposition rates of coarse woody debris (CWD) (> 10 cm diameter) from three tree species: Pinus radiata, Eucalyptus regnans, and Eucalyptus maculata. For this purpose, the density loss of logs on the ground sampled from chronosequences of sites following harvesting was determined using the water replacement technique. P. radiata logs were sampled 1, 2.5, 6, and 9 years following harvesting, and logs of E. regnans and E. maculata were collected from...[Show more]

dc.contributor.authorMackensen, Jens
dc.contributor.authorBauhus, Juergen
dc.date.accessioned2015-12-13T22:16:23Z
dc.date.available2015-12-13T22:16:23Z
dc.identifier.issn0038-0717
dc.identifier.urihttp://hdl.handle.net/1885/70832
dc.description.abstractThis study compared field and laboratory decomposition rates of coarse woody debris (CWD) (> 10 cm diameter) from three tree species: Pinus radiata, Eucalyptus regnans, and Eucalyptus maculata. For this purpose, the density loss of logs on the ground sampled from chronosequences of sites following harvesting was determined using the water replacement technique. P. radiata logs were sampled 1, 2.5, 6, and 9 years following harvesting, and logs of E. regnans and E. maculata were collected from sites that were harvested 1, 3.5, 6.5, and 12 and 1.5, 6.5, and 11.5 years ago, respectively. In addition, the C/N ratio of wood was determined and current respiration rates of logs from these different age classes were measured through laboratory incubation. The times for loss of 95% of material (t0.95) determined from density loss for these species were 24 years for P. radiata, 43 years for E. regnans, and 62 years for E. maculata. The decomposition rates of CWD derived from laboratory respiration were 6.1, 5.9 and 11.9 times higher than the decay rates from density loss in P. radiata, E. regnans, and E. maculata, respectively. This points to severe constraints of decomposition through adverse conditions in the field. The changes in respiration rates and C/N ratio with age of decaying logs indicated that the single component, negative exponential decay model could be applied satisfactorily only to P. radiata. In the case of the eucalypt species, substrate quality (expressed through respiration rates) declined in the oldest samples. This may be explained by the loss of rapidly decomposing sapwood and the retention of more decay-resistant heartwood. In these cases, a two-component model will be more suitable to describe the density loss of decaying wood.
dc.publisherPergamon-Elsevier Ltd
dc.sourceSoil Biology and Biochemistry
dc.subjectKeywords: Hardwoods; Harvesting; Respiratory mechanics; Wood debris; Plants (botany); coarse woody debris; decomposition; density; respiration; Hardwoods; Harvesting; Pinus; Eucalyptus; Eucalyptus maculata; Eucalyptus regnans; Pinus radiata Coarse woody debris; Decomposition; Wood density; Wood respiration
dc.titleDensity loss and respiration rates in coarse woody debris of Pinus radiata, Eucalyptus regnans and Eucalyptus maculata
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume35
dc.date.issued2003
local.identifier.absfor070504 - Forestry Management and Environment
local.identifier.ariespublicationMigratedxPub2434
local.type.statusPublished Version
local.contributor.affiliationMackensen, Jens, United Nations Environmental Program
local.contributor.affiliationBauhus, Juergen, College of Medicine, Biology and Environment, ANU
local.bibliographicCitation.startpage177
local.bibliographicCitation.lastpage186
local.identifier.doi10.1016/S0038-0717(02)00255-9
dc.date.updated2015-12-11T07:25:45Z
local.identifier.scopusID2-s2.0-0037229259
CollectionsANU Research Publications

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