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dc.contributor.advisorLeuzinger, Sebastian
dc.contributor.advisorAlfaro, Andrea
dc.contributor.authorTran, Phan
dc.date.accessioned2014-09-15T03:23:47Z
dc.date.available2014-09-15T03:23:47Z
dc.date.copyright2014
dc.date.created2014
dc.identifier.urihttp://hdl.handle.net/10292/7674
dc.description.abstractAccurate estimates for biomass pools and fluxes are the key for assessing the potential of vegetation to counteract anthropogenic carbon emissions. However, such data are laborious to retrieve and still missing for many ecosystems. In this study, I used the harvest method to estimate above- and below-ground biomass, and litter traps and litterbags to measure litterfall and decomposition of the New Zealand mangrove Avicennia marina var. australasica at Mangawhai Harbour, northern New Zealand from April 2013 to March 2014. Total above-ground biomass of A. marina was estimated at 2.69 - 8.88 kg m-2 and below-ground biomass at 11.62 - 14.7 kg m-2. The root-shoot ratio at this site was 1.73. Fine roots contributed most to the biomass stock with almost 50 % of the below-ground and 37 % of the total biomass. Woody biomass made up 32 %, coarse roots 27 %, leaf biomass 3 %, and pneumatophores and seedlings 1 % of the total biomass. More than 70 % of the root mass was located within 40 cm below the surface. Annual litterfall production of A. marina was estimated as 331.94±69.8 - 476.63±66.1 g m-2 y-1, with leaf litter accounting for 66.6 % - 82.3 %. Litterfall production positively correlated with temperature but it did not show any relationship with monthly maximum wind speed nor total rainfall. Leaf litter of A. marina at Mangawhai harbour decomposed rapidly during the first 37-39 days with 50-60 % of the initial dry weight lost. A further ~15-25 % was lost during the following 40 days, after which biomass loss became even slower. Litter decomposition was 96.5 % complete after 332 days with the average (linear) rate of decomposition of -3.99 % per day. From my findings, New Zealand mangroves store a total of 0.2 - 1.1 Mt carbon (C) above-ground and 1.06 - 1.72 Mt C below-ground. This, together with the high carbon density (6 - 9.9kg C m-2), implies that New Zealand mangroves are carbon-rich ecosystems.en_NZ
dc.language.isoenen_NZ
dc.publisherAuckland University of Technology
dc.subjectMangroveen_NZ
dc.subjectBiomassen_NZ
dc.subjectAllometryen_NZ
dc.subjectLitterfallen_NZ
dc.subjectDecompositionen_NZ
dc.subjectCarbon cylcingen_NZ
dc.titleAllometry, biomass and litter decomposition of the New Zealand mangrove Avicennia marina var. australasicaen_NZ
dc.typeThesis
thesis.degree.grantorAuckland University of Technology
thesis.degree.levelMasters Theses
thesis.degree.nameMaster of Applied Scienceen_NZ
thesis.degree.discipline
dc.rights.accessrightsOpenAccess
dc.date.updated2014-09-15T02:14:02Z


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