Landscape variation in canopy nitrogen and carbon assimilation in a temperate mixed forest

Oecologia
Zaixing ZhouLucie C Lepine

Abstract

Canopy nitrogen (N) is a key factor regulating carbon cycling in forest ecosystems through linkages among foliar N and photosynthesis, decomposition, and N cycling. This analysis examined landscape variation in canopy nitrogen and carbon assimilation in a temperate mixed forest surrounding Harvard Forest in central Massachusetts, USA by integration of canopy nitrogen mapping with ecosystem modeling, and spatial data from soils, stand characteristics and disturbance history. Canopy %N was mapped using high spectral resolution remote sensing from NASA's AVIRIS (Airborne Visible/Infrared Imaging Spectrometer) instrument and linked to an ecosystem model, PnET-II, to estimate gross primary productivity (GPP). Predicted GPP was validated with estimates derived from eddy covariance towers. Estimated canopy %N ranged from 0.5 to 2.9% with a mean of 1.75% across the study region. Predicted GPP ranged from 797 to 1622 g C m-2 year-1 with a mean of 1324 g C m-2 year-1. The prediction that spatial patterns in forest growth are associated with spatial patterns in estimated canopy %N was supported by a strong, positive relationship between field-measured canopy %N and aboveground net primary production. Estimated canopy %N and GPP were relat...Continue Reading

References

Feb 9, 2002·Environmental Pollution·Steven G McNulty
Nov 5, 2002·Tree Physiology·Julian L Hadley, Jessica L Schedlbauer
Apr 23, 2004·Nature·Ian J WrightRafael Villar
Sep 8, 2007·Environmental Science & Technology·Brenden E McNeilCharles T Driscoll
May 1, 2008·Ecology Letters·Peter B ReichJose-Luis Machado
Dec 5, 2008·Proceedings of the National Academy of Sciences of the United States of America·S V OllingerH P Schmid
Jan 27, 2012·Proceedings. Biological Sciences·Peter B Reich

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Citations

May 19, 2020·Global Change Biology·William MarchandYves Bergeron

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Software Mentioned

Bigfoot
MTCLIM
CN
II
PnET
AVIRIS

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