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Is NPP proportional to GPP? Waring’s hypothesis twenty years on

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Title: Is NPP proportional to GPP? Waring’s hypothesis twenty years on
Authors: Collalti, A
Prentice, I
Item Type: Journal Article
Abstract: Gross primary production (GPP) is partitioned to autotrophic respiration (Ra) and net primary production (NPP), the latter being used to build plant tissues and synthesize non-structural and secondary compounds. Waring et al. (1998) suggested that a NPP:GPP ratio of 0.47 ± 0.04 (s.d.) is universal across biomes, tree species and stand ages. Representing NPP in models as a fixed fraction of GPP, they argued, would be both simpler and more accurate than trying to simulate Ra mechanistically. This paper reviews progress in understanding the NPP:GPP ratio in forests during the 20 years since Waring et al.. Research has confirmed the existence of pervasive acclimation mechanisms that tend to stabilize the NPP:GPP ratio, and indicates that Ra should not be modelled independently of GPP. Nonetheless, studies indicate that the value of this ratio is influenced by environmental factors, stand age and management. The average NPP:GPP ratio in over 200 studies, representing different biomes, species and forest stand ages, was found to be 0.46, consistent with the central value that Waring et al. proposed but with a much larger standard deviation (± 0.12) and a total range (0.22 to 0.79) that is too large to be disregarded.
Issue Date: 1-Aug-2019
Date of Acceptance: 27-Mar-2019
URI: http://hdl.handle.net/10044/1/69743
DOI: 10.1093/treephys/tpz034
ISSN: 1758-4469
Publisher: Oxford University Press (OUP)
Start Page: 1473
End Page: 1483
Journal / Book Title: Tree Physiology
Volume: 39
Issue: 8
Copyright Statement: © The Author(s) 2019. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com. This is a pre-copy-editing, author-produced version of an article accepted for publication in Tree physiology following peer review. The definitive publisher-authenticated version is available online at: https://academic.oup.com/treephys/advance-article/doi/10.1093/treephys/tpz034/5423351
Sponsor/Funder: AXA Research Fund
European Research Council
Funder's Grant Number: AXA Chair Programme in Biosphere and Climate Impacts
787203
Keywords: Science & Technology
Life Sciences & Biomedicine
Forestry
autotrophic respiration
carbon-use efficiency
forest ecosystem
modelling
primary production
CARBON-USE EFFICIENCY
NET PRIMARY PRODUCTION
RESPIRATION PHOTOSYNTHESIS RATIO
WHOLE-PLANT RESPIRATION
FOREST ECOSYSTEM MODEL
EDDY COVARIANCE DATA
LEAF RESPIRATION
MAINTENANCE RESPIRATION
PRIMARY PRODUCTIVITY
THERMAL-ACCLIMATION
autotrophic respiration
carbon-use efficiency
forest ecosystem
modelling
primary production
Plant Biology & Botany
0705 Forestry Sciences
0607 Plant Biology
0602 Ecology
Publication Status: Published
Embargo Date: 2020-04-02
Online Publication Date: 2019-05-17
Appears in Collections:Faculty of Natural Sciences
Department of Life Sciences



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