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Decoupling Contributions from Canopy Structure and Leaf Optics is Critical for Remote Sensing Leaf Biochemistry (Reply to Townsend, et al.)Townsend et al. (1) agree that we explained that the apparent relationship (2) between foliar nitrogen (%N) and near-infrared (NIR) canopy reflectance was largely attributable to structure (which is in turn caused by variation in fraction of broadleaf canopy). Our conclusion that the observed correlation with %N was spurious (i.e., lacking a causal basis) is, thus, clearly justified: we demonstrated that structure explained the great majority of observed correlation, where the structural influence was derived precisely via reconciling the observed correlation with radiative-transfer theory. What this also suggests is that such correlations, although observed, do not uniquely provide information on canopy biochemical constituents.
Document ID
20130014364
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1073/pnas.1301247110
Authors
Knyazikhin, Yuri (Boston Univ. Boston, MA, United States)
Lewis, Philip (University Coll. London, United Kingdom)
Disney, Mathias I. (University Coll. London, United Kingdom)
Stenberg, Pauline (University Coll. London, United Kingdom)
Mottus, Matti (Helsinki Univ. Helsinki, Finland)
Rautianinen, Miina (University Coll. London, United Kingdom)
Kaufmann, Robert K. (Boston Univ. Boston, MA, United States)
Marshak, Alexander (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Schull, Mitchell A. (Department of Agriculture Beltsville, MD, United States)
Carmona, Pedro Latorre (Universidad Jaume I Castellon, Spain)
Vanderbilt, Vern (NASA Ames Research Center Moffett Field, CA, United States)
Davis, Anthony B. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Baret, Frederic (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Jacquemoud, Stephane (Institut de Physique du Globe Paris, France)
Lyapustin, Alexei (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Yang, Yan (Boston Univ. Boston, MA, United States)
Myneni, Ranga B. (Boston Univ. Boston, MA, United States)
Date Acquired
August 27, 2013
Publication Date
March 1, 2013
Publication Information
Publication: Proceedings of the National Academy of Sciences 2013
Volume: 110
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN8428
Funding Number(s)
CONTRACT_GRANT: NNJ06VA01C
Distribution Limits
Public
Copyright
Public Use Permitted.

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