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Seasonal trends of Amazonian rainforest phenology, net primary productivity, and carbon allocation

Girardin, Cécile A. J.; Malhi, Yadvinder; Doughty, Christopher E.; Metcalfe, Daniel B.; Meir, Patrick; del Aguila-Pasquel, Jhon; Araujo-Murakami, Alejandro; da Costa, Antonio Carlos Lola; Silva-Espejo, Javier E.; Farfán Amézquita, Filio; Rowland, Lucy

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The seasonality of solar irradiance and precipitation may regulate seasonal variations in tropical forests carbon cycling. Controversy remains over their importance as drivers of seasonal dynamics of net primary productivity in tropical forests. We use ground data from nine lowland Amazonian forest plots collected over 3 years to quantify the monthly primary productivity (NPP) of leaves, reproductive material, woody material, and fine roots over an annual cycle. We distinguish between forests...[Show more]

dc.contributor.authorGirardin, Cécile A. J.
dc.contributor.authorMalhi, Yadvinder
dc.contributor.authorDoughty, Christopher E.
dc.contributor.authorMetcalfe, Daniel B.
dc.contributor.authorMeir, Patrick
dc.contributor.authordel Aguila-Pasquel, Jhon
dc.contributor.authorAraujo-Murakami, Alejandro
dc.contributor.authorda Costa, Antonio Carlos Lola
dc.contributor.authorSilva-Espejo, Javier E.
dc.contributor.authorFarfán Amézquita, Filio
dc.contributor.authorRowland, Lucy
dc.date.accessioned2017-01-16T04:51:39Z
dc.date.available2017-01-16T04:51:39Z
dc.identifier.issn0886-6236
dc.identifier.urihttp://hdl.handle.net/1885/111850
dc.description.abstractThe seasonality of solar irradiance and precipitation may regulate seasonal variations in tropical forests carbon cycling. Controversy remains over their importance as drivers of seasonal dynamics of net primary productivity in tropical forests. We use ground data from nine lowland Amazonian forest plots collected over 3 years to quantify the monthly primary productivity (NPP) of leaves, reproductive material, woody material, and fine roots over an annual cycle. We distinguish between forests that do not experience substantial seasonal moisture stress (“humid sites”) and forests that experience a stronger dry season (“dry sites”). We find that forests from both precipitation regimes maximize leaf NPP over the drier season, with a peak in production in August at both humid (mean 0.39 ± 0.03 Mg C ha⁻¹ month⁻¹ in July, n = 4) and dry sites (mean 0.49 ± 0.03 Mg C ha⁻¹ month⁻¹ in September, n = 8). We identify two distinct seasonal carbon allocation patterns (the allocation of NPP to a specific organ such as wood leaves or fine roots divided by total NPP). The forests monitored in the present study show evidence of either (i) constant allocation to roots and a seasonal trade-off between leaf and woody material or (ii) constant allocation to wood and a seasonal trade-off between roots and leaves. Finally, we find strong evidence of synchronized flowering at the end of the dry season in both precipitation regimes. Flower production reaches a maximum of 0.047 ± 0.013 and 0.031 ± 0.004 Mg C ha⁻¹ month⁻¹ in November, in humid and dry sites, respectively. Fruitfall production was staggered throughout the year, probably reflecting the high variation in varying times to development and loss of fruit among species.
dc.format.mimetypeapplication/pdf
dc.publisherAmerican Geophysical Union
dc.rights© 2016. American Geoph ysical Union. http://www.sherpa.ac.uk/romeo/issn/0886-6236/..."Publisher's version/PDF must be used in Institutional Repository 6 months after publication." from SHERPA/RoMEO site (as at 16/01/17).
dc.sourceGlobal Biogeochemical Cycles
dc.titleSeasonal trends of Amazonian rainforest phenology, net primary productivity, and carbon allocation
dc.typeJournal article
local.identifier.citationvolume30
dc.date.issued2016-05-14
local.identifier.ariespublicationU3488905xPUB19305
local.publisher.urlhttp://sites.agu.org/
local.type.statusPublished Version
local.contributor.affiliationMeir, P., Research School of Biology, The Australian National University
dc.relationhttp://purl.org/au-research/grants/arc/FT110100457
local.bibliographicCitation.issue5
local.bibliographicCitation.startpage700
local.bibliographicCitation.lastpage715
local.identifier.doi10.1002/2015GB005270
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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