Advanced

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

Girardin, Cécile A J; Malhi, Yadvinder; Doughty, Christopher E.; Metcalfe, Daniel B. LU ; Meir, Patrick; del Aguila-Pasquel, Jhon; Araujo-Murakami, Alejandro; da Costa, Antonio C. L.; Silva Espejo, Javier E. and Farfán Amézquita, Filio, et al. (2016) In Global Biogeochemical Cycles 30(5). p.700-715
Abstract

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 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... (More)

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 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.

(Less)
Please use this url to cite or link to this publication:
author
, et al. (More)
(Less)
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
carbon allocation, ecosystem function, net primary productivity, phenology, seasonality, tropical forests
in
Global Biogeochemical Cycles
volume
30
issue
5
pages
16 pages
publisher
American Geophysical Union
external identifiers
  • scopus:84969960027
  • wos:000379949100006
ISSN
0886-6236
DOI
10.1002/2015GB005270
language
English
LU publication?
yes
id
6673c8f7-1c8a-43b3-8bc0-30e2991a1d1a
date added to LUP
2017-02-02 14:30:37
date last changed
2017-10-22 05:25:50
@article{6673c8f7-1c8a-43b3-8bc0-30e2991a1d1a,
  abstract     = {<p>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 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<sup>−1</sup> month<sup>−1</sup> in July, n = 4) and dry sites (mean 0.49 ± 0.03 Mg C ha<sup>−1</sup> month<sup>−1</sup> 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<sup>−1</sup> month<sup>−1</sup> 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.</p>},
  author       = {Girardin, Cécile A J and Malhi, Yadvinder and Doughty, Christopher E. and Metcalfe, Daniel B. and Meir, Patrick and del Aguila-Pasquel, Jhon and Araujo-Murakami, Alejandro and da Costa, Antonio C. L. and Silva Espejo, Javier E. and Farfán Amézquita, Filio and Rowland, Lucy},
  issn         = {0886-6236},
  keyword      = {carbon allocation,ecosystem function,net primary productivity,phenology,seasonality,tropical forests},
  language     = {eng},
  month        = {05},
  number       = {5},
  pages        = {700--715},
  publisher    = {American Geophysical Union},
  series       = {Global Biogeochemical Cycles},
  title        = {Seasonal trends of Amazonian rainforest phenology, net primary productivity, and carbon allocation},
  url          = {http://dx.doi.org/10.1002/2015GB005270},
  volume       = {30},
  year         = {2016},
}