title: The sensitivity of wood production to seasonal and interannual variations in climate in a lowland Amazonian rainforest.
abstract: Understanding climatic controls on tropical forest productivity is key to developing more reliable models for predicting how tropical biomes may respond to climate change. Currently there is no consensus on which factors control seasonal changes in tropical forest tree growth. This study reports the first comprehensive plot-level description of the seasonality of growth in a Peruvian tropical forest. We test whether seasonal and interannual variations in climate are correlated with changes in biomass increment, and whether such relationships differ among trees with different functional traits. We found that biomass increments, measured every 3 months on the two plots, were reduced by between 40 and 55% in the peak dry season (July-September) relative to peak wet season (January-March). The seasonal patterns of biomass accumulation are significantly (p < 0.01) associated with seasonal patterns of rainfall and soil water content; however, this may reflect a synchrony of seasonal cycles rather than direct physiological controls on tree growth rates. The strength of the growth seasonality response among trees is significantly correlated to functional traits: consistent with a hypothesised trade-off between maximum potential growth rate and hydraulic safety, tall and fast-growing trees with broad stems had the most strongly seasonal biomass accumulation, suggesting that they are more productive in the wet season, but more vulnerable to water limitation in the dry season.
authors.affiliation: School of Geosciences, The University of Edinburgh, Edinburgh, UK, lucy.rowland@ed.ac.uk.
authors.forename: Lucy
authors.initials: L
authors.lastname: Rowland
authors.forename: Y
authors.initials: Y
authors.lastname: Malhi
authors.forename: J E
authors.initials: JE
authors.lastname: Silva-Espejo
authors.forename: F
authors.initials: F
authors.lastname: Farfán-Amézquita
authors.forename: K
authors.initials: K
authors.lastname: Halladay
authors.forename: C E
authors.initials: CE
authors.lastname: Doughty
authors.forename: P
authors.initials: P
authors.lastname: Meir
authors.forename: O L
authors.initials: OL
authors.lastname: Phillips
mesh_terms: D018533:Biomass; D017753:Ecosystem; D010568:Peru; D011891:Rain; D012621:Seasons; D012987:Soil; D014197:Trees / Q000254:growth & development*; D014329:Tropical Climate; D014867:Water / Q000502:physiology; D014934:Wood
chemical_list: D012987:Soil; D014867:Water
references.citation: Ecology. 2007 Sep;88(9):2259-69
references.pmid: 17918404
references.citation: Proc Natl Acad Sci U S A. 2003 May 13;100(10):5852-7
references.pmid: 12719545
references.citation: Oecologia. 2005 Nov;146(1):1-12
references.pmid: 16012820
references.citation: Plant Cell Environ. 2008 May;31(5):632-45
references.pmid: 18088335
references.citation: Ecology. 2010 Dec;91(12):3664-74
references.pmid: 21302837
references.citation: Nature. 2006 Sep 28;443(7110):444-7
references.pmid: 17006512
references.citation: Nature. 2007 May 3;447(7140):80-2
references.pmid: 17476266
references.citation: New Phytol. 2007;174(4):787-798
references.pmid: 17504462
references.citation: New Phytol. 2010 Aug;187(3):631-46
references.pmid: 20659252
references.citation: Science. 2010 Nov 12;330(6006):927-31
references.pmid: 21071659
references.citation: New Phytol. 2010 Aug;187(3):647-65
references.pmid: 20659253
references.citation: Ecol Lett. 2009 Apr;12(4):351-66
references.pmid: 19243406
references.citation: Plant Cell Environ. 2012 Jan;35(1):116-25
references.pmid: 21895699
references.citation: New Phytol. 2010 Apr;186(2):439-50
references.pmid: 20158616
references.citation: Tree Physiol. 2006 Jun;26(6):689-701
references.pmid: 16510385
references.citation: Science. 2010 Aug 13;329(5993):834-8
references.pmid: 20603496
references.citation: Oecologia. 2008 Mar;155(3):405-15
references.pmid: 18049826
references.citation: Proc Natl Acad Sci U S A. 2009 Dec 8;106(49):20610-5
references.pmid: 19218454
references.citation: Oecologia. 2008 May;156(1):31-41
references.pmid: 18253753
references.citation: Ecol Lett. 2007 Jun;10(6):461-9
references.pmid: 17498145
references.citation: New Phytol. 2010 Aug;187(3):579-91
references.pmid: 20553386
references.citation: Oecologia. 2005 Aug;145(1):87-99
references.pmid: 15971085
references.citation: New Phytol. 2010 Apr;186(2):264-6
references.pmid: 20409181
references.citation: PLoS One. 2012;7(4):e34074
references.pmid: 22506012
references.citation: Oecologia. 2011 Sep;167(1):27-37
references.pmid: 21445684
references.citation: New Phytol. 2010 Jan;185(2):481-92
references.pmid: 19925555
references.citation: Tree Physiol. 2004 Aug;24(8):891-9
references.pmid: 15172839