Asian tropical forests assimilating carbon under dry conditions: Water stress or light benefits?

Yang, LY; Yu, R; Wu, J; Zhang, Y; Kosugi, Y; Restrepo-Coupe, N; Huete, A; Zhang, J; Liu, YH; Zhang, X; Liu, WJ; Zhao, JF; Zeng, J; Song, QH; Chen, YJ; Song, L; Tan, ZH

Asian tropical forests assimilating carbon under dry conditions: Water stress or light benefits?

Yang, LY Yu, R Wu, J Zhang, Y Kosugi, Y Restrepo-Coupe, N Huete, A

Zhang, J Liu, YH Zhang, X Liu, WJ Zhao, JF Zeng, J Song, QH Chen, YJ Song, L Tan, ZH

Permalink

Publisher:: OXFORD UNIV PRESS
Publication Type:: Journal Article
Citation:: Journal of Plant Ecology, 2023, 16, (3)
Issue Date:: 2023-06-01

Open Access

Copyright Clearance Process

Recently Added
In Progress
Open Access

This item is open access.

Adobe PDF

Download Published versionAdobe PDF (3.17 MB)

View on publisher's site

View statistics

Full metadata record

Field	Value	Language
dc.contributor.author	Yang, LY
dc.contributor.author	Yu, R
dc.contributor.author	Wu, J
dc.contributor.author	Zhang, Y
dc.contributor.author	Kosugi, Y
dc.contributor.author	Restrepo-Coupe, N
dc.contributor.author	Huete, A https://orcid.org/0000-0003-2809-2376
dc.contributor.author	Zhang, J
dc.contributor.author	Liu, YH
dc.contributor.author	Zhang, X
dc.contributor.author	Liu, WJ
dc.contributor.author	Zhao, JF
dc.contributor.author	Zeng, J
dc.contributor.author	Song, QH
dc.contributor.author	Chen, YJ
dc.contributor.author	Song, L
dc.contributor.author	Tan, ZH
dc.contributor.editor	Osborne, B
dc.date.accessioned	2024-01-30T05:22:37Z
dc.date.available	2024-01-30T05:22:37Z
dc.date.issued	2023-06-01
dc.identifier.citation	Journal of Plant Ecology, 2023, 16, (3)
dc.identifier.issn	1752-9921
dc.identifier.issn	1752-993X
dc.identifier.uri	http://hdl.handle.net/10453/175081
dc.description.abstract	Tropical forests are characterized by vast biomass, complex structures and mega-biodiversity. However, the adaptation processes of these forests to seasonal water availability are less understood, especially those located in the monsoonal and mountainous regions of tropical Southeast Asia. This study used four representative tropical forests spanning from 2° N to 22° N in continental Southeast Asia to address dry-condition photosynthesis at the seasonal scale. We first provided novel and reliable estimations of ecosystem photosynthesis (gross primary production; GPP) seasonality at all four sites. As expected, both evergreen and deciduous seasonal forests exhibited higher GPPs during the rainy season than during the dry season. A bimodal pattern corresponding to solar radiation occurred in the GPP of the perhumid forest. The surface conductance (Gs) was consistently lower both in the dry season and during dry spells (DSPs) than during the wet season and non-dry spells. However, this did not prevent GPP from increasing alongside increasing irradiance in the perhumid forest, suggesting that other ecosystem physiological properties, for example, the light-saturated photosynthetic rate, must have increased, thus surpassing the effect of Gs reduction. Thus, perhumid forests could be defined as light-demanding ecosystems with regard to their seasonal dynamics. Seasonal forests are water-stressed ecosystems in the dry season, as shown by the reductions in GPP, Gs and related ecosystem physiological properties. At all four forest sites, we observed a lack of consistent adaptive strategy to fit the water seasonality due to the diversity in leaf phenology, soil nutrient availability, root depth and other potential factors.
dc.language	English
dc.publisher	OXFORD UNIV PRESS
dc.relation.ispartof	Journal of Plant Ecology
dc.relation.isbasedon	10.1093/jpe/rtac106
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0602 Ecology, 0607 Plant Biology
dc.subject.classification	3103 Ecology
dc.title	Asian tropical forests assimilating carbon under dry conditions: Water stress or light benefits?
dc.type	Journal Article
utslib.citation.volume	16
utslib.for	0602 Ecology
utslib.for	0607 Plant Biology
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Science
pubs.organisational-group	University of Technology Sydney/Faculty of Science/School of Life Sciences
pubs.organisational-group	University of Technology Sydney/Strength - CAMGIS - Centre for Advanced Modelling and Geospatial lnformation Systems
utslib.copyright.status	open_access	*
dc.date.updated	2024-01-30T05:22:36Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	16
utslib.citation.issue	3

Abstract:

Tropical forests are characterized by vast biomass, complex structures and mega-biodiversity. However, the adaptation processes of these forests to seasonal water availability are less understood, especially those located in the monsoonal and mountainous regions of tropical Southeast Asia. This study used four representative tropical forests spanning from 2° N to 22° N in continental Southeast Asia to address dry-condition photosynthesis at the seasonal scale. We first provided novel and reliable estimations of ecosystem photosynthesis (gross primary production; GPP) seasonality at all four sites. As expected, both evergreen and deciduous seasonal forests exhibited higher GPPs during the rainy season than during the dry season. A bimodal pattern corresponding to solar radiation occurred in the GPP of the perhumid forest. The surface conductance (Gs) was consistently lower both in the dry season and during dry spells (DSPs) than during the wet season and non-dry spells. However, this did not prevent GPP from increasing alongside increasing irradiance in the perhumid forest, suggesting that other ecosystem physiological properties, for example, the light-saturated photosynthetic rate, must have increased, thus surpassing the effect of Gs reduction. Thus, perhumid forests could be defined as light-demanding ecosystems with regard to their seasonal dynamics. Seasonal forests are water-stressed ecosystems in the dry season, as shown by the reductions in GPP, Gs and related ecosystem physiological properties. At all four forest sites, we observed a lack of consistent adaptive strategy to fit the water seasonality due to the diversity in leaf phenology, soil nutrient availability, root depth and other potential factors.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/175081