Is NPP proportional to GPP?

Waring's hypothesis 20 years on

A. Collalti, I. C. Prentice

Research output: Contribution to journalReview article

19 Citations (Scopus)

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; Net primary production of forests: a constant fraction of gross primary production? Tree Physiol 18:129-134) suggested that a NPP:GPP ratio of 0.47 ± 0.04 (SD) 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 the Waring et al. paper. 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 (0.22-0.79) that is too large to be disregarded.

Original languageEnglish
Pages (from-to)1473-1483
Number of pages11
JournalTree physiology
Volume39
Issue number8
DOIs
Publication statusPublished - Aug 2019

Keywords

  • autotrophic respiration
  • carbon-use efficiency
  • forest ecosystem
  • modelling
  • primary production

Fingerprint Dive into the research topics of 'Is NPP proportional to GPP? Waring's hypothesis 20 years on'. Together they form a unique fingerprint.

  • Cite this