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Partitioning interannual variability in net ecosystem exchange between climatic variability and functional change.

Publication ,  Journal Article
Hui, D; Luo, Y; Katul, G
Published in: Tree physiology
May 2003

Interannual variability (IAV) in net ecosystem exchange of carbon (NEE) is a critical factor in projections of future ecosystem changes. However, our understanding of IAV is limited because of the difficulty in isolating its numerous causes. We proposed that IAV in NEE is primarily caused by climatic variability, through its direct effects on photosynthesis and respiration and through its indirect effects on carbon fluxes (i.e., the parameters that govern photosynthesis and respiration), hereafter called functional change. We employed a homogeneity-of-slopes model to identify the functional change contributing to IAV in NEE and nighttime ecosystem respiration (RE). The model uses multiple regression analysis to relate NEE and RE with climatic variables for individual years and for all years. If the use of different slopes for each year significantly improves the model fitting compared to the use of one slope for all years, we consider that functional change exists, at least on annual time scales. With the functional change detected, we then partition the observed variation in NEE or RE to four components, namely, the functional change, the direct effect of interannual climatic variability, the direct effect of seasonal climatic variation, and random error. Application of this approach to a data set collected at the Duke Forest AmeriFlux site from August 1997 to December 2001 indicated that functional change, interannual climatic variability, seasonal climatic variation and random error explained 9.9, 8.9, 59.9 and 21.3%, respectively, of the observed variation in NEE and 13.1, 5.0, 38.1 and 43.8%, respectively, of the observed variation in RE.

Duke Scholars

Published In

Tree physiology

DOI

EISSN

1758-4469

ISSN

0829-318X

Publication Date

May 2003

Volume

23

Issue

7

Start / End Page

433 / 442

Related Subject Headings

  • Seasons
  • Plants
  • Plant Biology & Botany
  • Photosynthesis
  • Ecosystem
  • Climate
  • Cell Respiration
  • Carbon Dioxide
  • 4101 Climate change impacts and adaptation
  • 3108 Plant biology
 

Citation

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Hui, D., Luo, Y., & Katul, G. (2003). Partitioning interannual variability in net ecosystem exchange between climatic variability and functional change. Tree Physiology, 23(7), 433–442. https://doi.org/10.1093/treephys/23.7.433
Hui, Dafeng, Yiqi Luo, and Gabriel Katul. “Partitioning interannual variability in net ecosystem exchange between climatic variability and functional change.Tree Physiology 23, no. 7 (May 2003): 433–42. https://doi.org/10.1093/treephys/23.7.433.
Hui, Dafeng, et al. “Partitioning interannual variability in net ecosystem exchange between climatic variability and functional change.Tree Physiology, vol. 23, no. 7, May 2003, pp. 433–42. Epmc, doi:10.1093/treephys/23.7.433.
Journal cover image

Published In

Tree physiology

DOI

EISSN

1758-4469

ISSN

0829-318X

Publication Date

May 2003

Volume

23

Issue

7

Start / End Page

433 / 442

Related Subject Headings

  • Seasons
  • Plants
  • Plant Biology & Botany
  • Photosynthesis
  • Ecosystem
  • Climate
  • Cell Respiration
  • Carbon Dioxide
  • 4101 Climate change impacts and adaptation
  • 3108 Plant biology