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Minimum carbon uptake controls the interannual variability of ecosystem productivity in tropical evergreen forests

Li, Zhao LU ; Ahlström, Anders LU ; Tian, Feng LU ; Gärtner, Antje LU ; Jiang, Ming and Xia, Jianyang (2020) In Global and Planetary Change 195.
Abstract

Tropical evergreen forests contribute an important part to the interannual variability (IAV) of the global terrestrial gross primary productivity (GPP). Due to its year-round growing-season, high minimum carbon uptake (GPPmin) and dry season greening-up, the key processes driving the GPP variability across seasonal to interannual scale are still in debate. Here, we analyzed the time-series of FLUXCOM GPP (1980–2013), sun-induced fluorescence (SIF; 2001–2013) and site-level GPP measurements in three tropical evergreen forests regions (i.e., Amazon, Africa, and Southeast Asia). We decomposed the annual accumulated GPP into the basic and recurrent GPP, which represent the accumulated minimum and seasonal vegetation productivity,... (More)

Tropical evergreen forests contribute an important part to the interannual variability (IAV) of the global terrestrial gross primary productivity (GPP). Due to its year-round growing-season, high minimum carbon uptake (GPPmin) and dry season greening-up, the key processes driving the GPP variability across seasonal to interannual scale are still in debate. Here, we analyzed the time-series of FLUXCOM GPP (1980–2013), sun-induced fluorescence (SIF; 2001–2013) and site-level GPP measurements in three tropical evergreen forests regions (i.e., Amazon, Africa, and Southeast Asia). We decomposed the annual accumulated GPP into the basic and recurrent GPP, which represent the accumulated minimum and seasonal vegetation productivity, respectively. Then we quantified the proportion of each component and estimated the contribution to the IAV of GPP. We find that the basic GPP overwhelmed the recurrent GPP with the averaging ratio of 4.2:1 across the global tropical regions, and dominated the IAV of annual total GPP in 83.7% of the tropical evergreen forest areas. The high contribution of the basic GPP resulted from the great sensitivity of GPPmin to rainfall changes among years. The decomposition of the basic and recurrent GPP sheds new light on the understanding of tropical GPP variability in responding to climate change at seasonal and annual scale. Our study highlights the critical role of the GPPmin in shaping temporal dynamics of the annual GPP in tropical forests and emphasizes the importance of managing tropical forest of the shifting periods between wet-dry seasons in global tropical regions.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Carbon uptake, GPP, Inter-annual variability, Minimum vegetation growth, Photosynthesis, Tropical evergreen forests
in
Global and Planetary Change
volume
195
article number
103343
publisher
Elsevier
external identifiers
  • scopus:85096209919
ISSN
0921-8181
DOI
10.1016/j.gloplacha.2020.103343
language
English
LU publication?
yes
id
6888b82e-0499-49c2-be42-37d4255191a3
date added to LUP
2020-12-15 17:13:11
date last changed
2021-04-21 13:42:36
@article{6888b82e-0499-49c2-be42-37d4255191a3,
  abstract     = {<p>Tropical evergreen forests contribute an important part to the interannual variability (IAV) of the global terrestrial gross primary productivity (GPP). Due to its year-round growing-season, high minimum carbon uptake (GPP<sub>min</sub>) and dry season greening-up, the key processes driving the GPP variability across seasonal to interannual scale are still in debate. Here, we analyzed the time-series of FLUXCOM GPP (1980–2013), sun-induced fluorescence (SIF; 2001–2013) and site-level GPP measurements in three tropical evergreen forests regions (i.e., Amazon, Africa, and Southeast Asia). We decomposed the annual accumulated GPP into the basic and recurrent GPP, which represent the accumulated minimum and seasonal vegetation productivity, respectively. Then we quantified the proportion of each component and estimated the contribution to the IAV of GPP. We find that the basic GPP overwhelmed the recurrent GPP with the averaging ratio of 4.2:1 across the global tropical regions, and dominated the IAV of annual total GPP in 83.7% of the tropical evergreen forest areas. The high contribution of the basic GPP resulted from the great sensitivity of GPP<sub>min</sub> to rainfall changes among years. The decomposition of the basic and recurrent GPP sheds new light on the understanding of tropical GPP variability in responding to climate change at seasonal and annual scale. Our study highlights the critical role of the GPP<sub>min</sub> in shaping temporal dynamics of the annual GPP in tropical forests and emphasizes the importance of managing tropical forest of the shifting periods between wet-dry seasons in global tropical regions.</p>},
  author       = {Li, Zhao and Ahlström, Anders and Tian, Feng and Gärtner, Antje and Jiang, Ming and Xia, Jianyang},
  issn         = {0921-8181},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Global and Planetary Change},
  title        = {Minimum carbon uptake controls the interannual variability of ecosystem productivity in tropical evergreen forests},
  url          = {http://dx.doi.org/10.1016/j.gloplacha.2020.103343},
  doi          = {10.1016/j.gloplacha.2020.103343},
  volume       = {195},
  year         = {2020},
}