Tree-ring δ 13C tracks flux tower ecosystem productivity estimates in a NE temperate forest

Soumaya Belmecheri, R. Stockton Maxwell, Alan H. Taylor, Kenneth J. Davis, Katherine H. Freeman, William J. Munger

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We investigated relationships between tree-ring δ13C and growth, and flux tower estimates of gross primary productivity (GPP) at Harvard Forest from 1992 to 2010. Seasonal variations of derived photosynthetic isotope discrimination (Δ13C) and leaf intercellular CO2 concentration (ci) showed significant increasing trends for the dominant deciduous and coniferous species. Δ13C was positively correlated to growing-season GPP and is primarily controlled by precipitation and soil moisture indicating that site conditions maintained high stomatal conductance under increasing atmospheric CO2 levels. Increasing Δ13C over the 1992-2010 period is attributed to increasing annual and summer water availability identified at Harvard Forest and across the region. Higher Δ13C is coincident with an enhancement in growth and ecosystem-level net carbon uptake. This work suggests that tree-ring δ13C could serve as a measure of forest GPP and be used to improve the calibration and predictive skill of ecosystem and carbon cycle models.

Original languageEnglish (US)
Article number074011
JournalEnvironmental Research Letters
Volume9
Issue number7
DOIs
StatePublished - Jul 1 2014

Fingerprint

temperate forest
tree ring
Ecosystems
Towers
Ecosystem
Productivity
Fluxes
productivity
ecosystem
Carbon Cycle
Carbon
Soil moisture
Growth
stomatal conductance
carbon cycle
water availability
Isotopes
Calibration
Soil
growing season

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Public Health, Environmental and Occupational Health

Cite this

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abstract = "We investigated relationships between tree-ring δ13C and growth, and flux tower estimates of gross primary productivity (GPP) at Harvard Forest from 1992 to 2010. Seasonal variations of derived photosynthetic isotope discrimination (Δ13C) and leaf intercellular CO2 concentration (ci) showed significant increasing trends for the dominant deciduous and coniferous species. Δ13C was positively correlated to growing-season GPP and is primarily controlled by precipitation and soil moisture indicating that site conditions maintained high stomatal conductance under increasing atmospheric CO2 levels. Increasing Δ13C over the 1992-2010 period is attributed to increasing annual and summer water availability identified at Harvard Forest and across the region. Higher Δ13C is coincident with an enhancement in growth and ecosystem-level net carbon uptake. This work suggests that tree-ring δ13C could serve as a measure of forest GPP and be used to improve the calibration and predictive skill of ecosystem and carbon cycle models.",
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Tree-ring δ 13C tracks flux tower ecosystem productivity estimates in a NE temperate forest. / Belmecheri, Soumaya; Maxwell, R. Stockton; Taylor, Alan H.; Davis, Kenneth J.; Freeman, Katherine H.; Munger, William J.

In: Environmental Research Letters, Vol. 9, No. 7, 074011, 01.07.2014.

Research output: Contribution to journalArticle

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AU - Belmecheri, Soumaya

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