Allocation of gross primary production in forest ecosystems: allometric constraints and environmental responses

Guangshui Chen, Yusheng Yang, David Robinson

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

• Understanding the allocation of gross primary production (GPP) and its response to climate is essential for improving terrestrial carbon (C) modelling.
• Here, we synthesize data on component GPP fluxes from a worldwide forest database to determine the allocation patterns of GPP across global gradients in climate and nitrogen deposition (Ndep).
• Our results revealed that allocation of GPP is governed in an integrated way by allometric constraints and by three trade-offs among GPP components: wood production (NPPwood) vs. fine-root production (NPPfroot), NPPwood vs. foliage production (NPPfoliage), and autotrophic respiration (Ra) vs. all biomass production components. Component fluxes were explained more by allometry, while partitioning to components was related more closely to the trade-offs. Elevated temperature and Ndep benefit long-term woody biomass C sequestration by stimulating allometric partitioning to wood. Ndep can also enhance forest C use efficiency by its effect on the Ra vs. biomass production trade-off. Greater precipitation effects C allocation by driving the NPPwood vs. NPPfoliage trade-off toward the latter component.
• These results advance our understanding about the global constraints on GPP allocation in forest ecosystems and its climatic responses, and are therefore valuable for simulations and projections of ecosystem C sequestration.
Original languageEnglish
Pages (from-to)1176-1186
Number of pages10
JournalNew Phytologist
Volume120
Issue number4
Early online date31 Jul 2013
DOIs
Publication statusPublished - Dec 2013

Keywords

  • assimilate allocation
  • carbon accumulation
  • optimal partitioning
  • plant allometry
  • climate change
  • forest ecosystems

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