You are here: Home
/ Publication Information
Title: Drought during canopy development has lasting effect on annual carbon balance in a deciduous temperate forest
Author: Noormets, Asko; McNulty, Steve G.; DeForest, Jared L.; Sun, Ge; Li, Qinglin; Chen, Jiquan
Source: New Phytologist, Vol. 179: 818-828
- Climate change projections predict an intensifying hydrologic cycle and an increasing frequency of droughts, yet quantitative understanding of the effects on ecosystem carbon exchange remains limited
- Here, the effect of contrasting precipitation and soil moisture dynamics were evaluated on forest carbon exchange using 2 yr of eddy covariance and microclimate data from a 50-yr-old mixed oak woodland in northern Ohio, USA.
- The stand accumulated 40% less carbon in a year with drought between bud-break and full leaf expansion (354 ± 81 g C m−2 yr−1 in 2004 and 252 ± 45 g C m−2 yr−1 in 2005). This was caused by greater suppression of gross ecosystem productivity (GEP; 16% = 200 g) than of ecosystem respiration (ER; 11% = 100 g) by drought. Suppressed GEP was traced to lower leaf area, lower apparent quantum yield and lower canopy conductance. The moisture sensitivity of ER may have been mediated by GEP.
- The results highlight the vulnerability of the ecosystem to even a moderate drought, when it affects a critical aspect of development. Although the drought was preceded by rain, the storage capacity of the soil seemed limited to 1–2 wk, and therefore droughts longer than this are likely to impair productivity in the region.
Keywords: canopy conductance, canopy development, drought, ecosystem respiration (ER), gross ecosystem productivity (GEP), leaf expansion, net ecosystem exchange of carbon (NEE), rainfall distribution
View or Print this Publication (525 KB bytes)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
Noormets, Asko; McNulty, Steve G.; DeForest, Jared L.; Sun, Ge; Li, Qinglin; Chen, Jiquan 2008. Drought during canopy development has lasting effect on annual carbon balance in a deciduous temperate forest. New Phytologist, Vol. 179: 818-828
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility