Skip to Main Content
Effects of chronic N additions on tissue chemistry, photosynthetic capacity, and carbon sequestration potential of a red pine (Pinus resinosa Ait.) stand in the NE United StatesAuthor(s): G.A. Bauer; F.A. Bazzaz; R. Minocha; S. Long; A. Magill; J. Aber; G.M. Berntson
Source: Forest Ecology and Management. 196: 173?186.
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
PDF: View PDF (208.29 KB)
DescriptionTemperate forests are predicted to play a key role as important sinks for atmospheric carbon dioxide, which could be enhanced by nitrogen (N) deposition. However, experimental evidence suggests that the impact of N deposition on temperate forest productivity may not be as great as originally assumed. We investigated how chronic N addition affects needle morphology, nitrogen metabolism (or partitioning) photosynthetic capacity and foliage productivity. The investigation is based at the Harvard Forest (MA) as part of a now 15-year long N amendment study. Foliar N content in red pine (Pinus resinosa) of the high N treatment has significantly increased, but this increase was accompanied by a de-coupling of the photosynthesis?N relationship. In addition needle longevity in the high N trees was significantly lower compared to the control trees. Conifers of the high N treatment did not use the surplus of N to optimize the amount of photosynthetically active metabolites. Instead N accumulated as soluble protein (other than Rubisco), amino acids and chlorophyll. Photosynthetic capacity in the control trees was about 50% higher than in the fertilized trees. These results indicate that the increase in leaf N is not accompanied by a greater capacity for carbon assimilation in the high N treatment. Using a simple model (PnET-Day) of canopy photosynthesis and carbon allocation, we assessed the long-term effect of these physiological changes on ecosystem carbon balance. The model results emphasize and reinforce the large difference between rates of carbon accumulation predicted to occur if net photosynthesis remained linearly related to foliar N concentration, and rates measured in the field.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
- 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.
CitationBauer, G.A.; Bazzaz, F.A.; Minocha, R.; Long, S.; Magill, A.; Aber, J.; Berntson, G.M. 2004. Effects of chronic N additions on tissue chemistry, photosynthetic capacity, and carbon sequestration potential of a red pine (Pinus resinosa Ait.) stand in the NE United States. Forest Ecology and Management. 196: 173?186.
Keywordsphotosynthesis, needle longevity, nitrogen, chlorophyll, NPP, Pinus resinosa
- Seasonal variations in red pine (Pinus resinosa) and jack pine (Pinus banksiana) foliar physio-chemistry and their potential influence on stand-scale wildland fire behavior
- Red Pine in the Northern Lake States
- Growth in relation to canopy light interception in a red pine (Pinus resinosa) thinning study
XML: View XML