Interannual and spatial variability of net ecosystem production in forests explained by an integrated physiological indicator in summer

Understanding the feedback of ecosystem carbon uptake on climate change at temporal and spatial scales is crucial for developing ecosystem models. Previous studies have focused on the role of spring and autumn phenology in regulating carbon sequestration in forest stands, but few on the impact of ph...

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Autores principales:	Ying Liu, Chaoyang Wu, Lin Liu, Chengyan Gu, T. Andrew Black, Rachhpal S. Jassal, Lukas Hörtnagl, Leonardo Montagnani, Fernando Moyano, Andrej Varlagin, M. Altaf Arain, Ajit Govind
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Physiology Phenology Forest Flux Net ecosystem production Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/607e20e20bb1492897433d64782622b9
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spelling	oai:doaj.org-article:607e20e20bb1492897433d64782622b92021-12-01T04:57:23ZInterannual and spatial variability of net ecosystem production in forests explained by an integrated physiological indicator in summer1470-160X10.1016/j.ecolind.2021.107982https://doaj.org/article/607e20e20bb1492897433d64782622b92021-10-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21006476https://doaj.org/toc/1470-160XUnderstanding the feedback of ecosystem carbon uptake on climate change at temporal and spatial scales is crucial for developing ecosystem models. Previous studies have focused on the role of spring and autumn phenology in regulating carbon sequestration in forest stands, but few on the impact of physiological status in summer. However, plant accumulated the most carbon in summer compared with spring and autumn, therefore, it is of great significance to explore the role of summer phenological metrics on the variability of carbon sequestration. Using 514 site-years of flux data obtained at 40 FLUXNET sites including three forest ecosystems (i.e. evergreen needleleaf forest (ENF), deciduous broadleaf forest (DBF) and mixed forest (MF)) in Europe and North America, we compared the potential of physiological and phenological metrics of Gross Primary Production (GPP) and Ecosystem Respiration (RECO) in explaining the interannual and spatial variability (IAV and SV) of forest net ecosystem production (NEP). In view of the better performance of physiological metrics, we developed the maximum carbon uptake index (MCUI), which integrated the physiology metrics of photosynthesis and respiration in summer, and further explored its ability in explaining the IAV and SV of NEP. The results suggest that the MCUI had a better ability than respiration-growth length ratio (RGR) in predicting NEP for all three forest types. The interpretation of MCUI based on meteorological variables illustrated that the controlling meteorological factors of MCUI differed substantially among ecosystems. The summer shortwave radiation had the greatest influence on MCUI at DBF sites, while the soil water content played an important but opposite role at ENF and DBF sites, and no significant meteorological driver was found at MF sites. The higher potential of MCUI in explaining IAV and SV of NEP highlights the importance of summer physiology in controlling the forest carbon sequestration, and further confirms the significant role of peak plant growth in regulating carbon cycle of forest ecosystems. Understanding the drivers of peak plant growth is therefore of a great significance for further improving the precious of ecosystem model in the future.Ying LiuChaoyang WuLin LiuChengyan GuT. Andrew BlackRachhpal S. JassalLukas HörtnaglLeonardo MontagnaniFernando MoyanoAndrej VarlaginM. Altaf ArainAjit GovindElsevierarticlePhysiologyPhenologyForestFluxNet ecosystem productionEcologyQH540-549.5ENEcological Indicators, Vol 129, Iss , Pp 107982- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physiology Phenology Forest Flux Net ecosystem production Ecology QH540-549.5
spellingShingle	Physiology Phenology Forest Flux Net ecosystem production Ecology QH540-549.5 Ying Liu Chaoyang Wu Lin Liu Chengyan Gu T. Andrew Black Rachhpal S. Jassal Lukas Hörtnagl Leonardo Montagnani Fernando Moyano Andrej Varlagin M. Altaf Arain Ajit Govind Interannual and spatial variability of net ecosystem production in forests explained by an integrated physiological indicator in summer
description	Understanding the feedback of ecosystem carbon uptake on climate change at temporal and spatial scales is crucial for developing ecosystem models. Previous studies have focused on the role of spring and autumn phenology in regulating carbon sequestration in forest stands, but few on the impact of physiological status in summer. However, plant accumulated the most carbon in summer compared with spring and autumn, therefore, it is of great significance to explore the role of summer phenological metrics on the variability of carbon sequestration. Using 514 site-years of flux data obtained at 40 FLUXNET sites including three forest ecosystems (i.e. evergreen needleleaf forest (ENF), deciduous broadleaf forest (DBF) and mixed forest (MF)) in Europe and North America, we compared the potential of physiological and phenological metrics of Gross Primary Production (GPP) and Ecosystem Respiration (RECO) in explaining the interannual and spatial variability (IAV and SV) of forest net ecosystem production (NEP). In view of the better performance of physiological metrics, we developed the maximum carbon uptake index (MCUI), which integrated the physiology metrics of photosynthesis and respiration in summer, and further explored its ability in explaining the IAV and SV of NEP. The results suggest that the MCUI had a better ability than respiration-growth length ratio (RGR) in predicting NEP for all three forest types. The interpretation of MCUI based on meteorological variables illustrated that the controlling meteorological factors of MCUI differed substantially among ecosystems. The summer shortwave radiation had the greatest influence on MCUI at DBF sites, while the soil water content played an important but opposite role at ENF and DBF sites, and no significant meteorological driver was found at MF sites. The higher potential of MCUI in explaining IAV and SV of NEP highlights the importance of summer physiology in controlling the forest carbon sequestration, and further confirms the significant role of peak plant growth in regulating carbon cycle of forest ecosystems. Understanding the drivers of peak plant growth is therefore of a great significance for further improving the precious of ecosystem model in the future.
format	article
author	Ying Liu Chaoyang Wu Lin Liu Chengyan Gu T. Andrew Black Rachhpal S. Jassal Lukas Hörtnagl Leonardo Montagnani Fernando Moyano Andrej Varlagin M. Altaf Arain Ajit Govind
author_facet	Ying Liu Chaoyang Wu Lin Liu Chengyan Gu T. Andrew Black Rachhpal S. Jassal Lukas Hörtnagl Leonardo Montagnani Fernando Moyano Andrej Varlagin M. Altaf Arain Ajit Govind
author_sort	Ying Liu
title	Interannual and spatial variability of net ecosystem production in forests explained by an integrated physiological indicator in summer
title_short	Interannual and spatial variability of net ecosystem production in forests explained by an integrated physiological indicator in summer
title_full	Interannual and spatial variability of net ecosystem production in forests explained by an integrated physiological indicator in summer
title_fullStr	Interannual and spatial variability of net ecosystem production in forests explained by an integrated physiological indicator in summer
title_full_unstemmed	Interannual and spatial variability of net ecosystem production in forests explained by an integrated physiological indicator in summer
title_sort	interannual and spatial variability of net ecosystem production in forests explained by an integrated physiological indicator in summer
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/607e20e20bb1492897433d64782622b9
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Interannual and spatial variability of net ecosystem production in forests explained by an integrated physiological indicator in summer

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