TY - JOUR
T1 - Remote sensing of vegetation canopy photosynthetic and stomatal conductance efficiencies
AU - Myneni, R. B.
AU - Ganapol, B. D.
AU - Asrar, G.
N1 - Funding Information:
The work reported here was made posszble through NASA Grant NAS5-30442, we gratefully acknowledge thzs support Atmospheric radtattve transfer results used zn th~s study were provtded by Dr Tanrd during an earher coUaboratwn
PY - 1992/12
Y1 - 1992/12
N2 - The problem of remote sensing the canopy photosynthetic and stomatal conductance efficiencies is investigated with the aid of one- and three-dimensional radiative transfer methods coupled to a semiempirical mechanistic model of leaf photosynthesis and stomatal conductance. Desertlike vegetation is modeled as clumps of leaves randomly distributed on a bright dry soil with partial ground cover. Normalized difference vegetation index (NDVI), canopy photosynthetic (Ep), and stomatal efficiencies (Es) are calculated for various geometrical, optical, and illumination conditions. A base case is defined to investigate the dynamics of Ep and Es with respect to ground cover, clump leaf area index, soil reflectance, and atmospheric conditions. The contribution of various radiative fluxes to estimates of Ep is evaluated and the magnitude of errors in bulk canopy formulation of problem parameters are quantifieid. The nature and sensitivity of the relationship between Ep and Es to NDVI is investigated and an algorithim is proposed for use in operational remote sensing.
AB - The problem of remote sensing the canopy photosynthetic and stomatal conductance efficiencies is investigated with the aid of one- and three-dimensional radiative transfer methods coupled to a semiempirical mechanistic model of leaf photosynthesis and stomatal conductance. Desertlike vegetation is modeled as clumps of leaves randomly distributed on a bright dry soil with partial ground cover. Normalized difference vegetation index (NDVI), canopy photosynthetic (Ep), and stomatal efficiencies (Es) are calculated for various geometrical, optical, and illumination conditions. A base case is defined to investigate the dynamics of Ep and Es with respect to ground cover, clump leaf area index, soil reflectance, and atmospheric conditions. The contribution of various radiative fluxes to estimates of Ep is evaluated and the magnitude of errors in bulk canopy formulation of problem parameters are quantifieid. The nature and sensitivity of the relationship between Ep and Es to NDVI is investigated and an algorithim is proposed for use in operational remote sensing.
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U2 - 10.1016/0034-4257(92)90103-Q
DO - 10.1016/0034-4257(92)90103-Q
M3 - Article
AN - SCOPUS:0027007601
SN - 0034-4257
VL - 42
SP - 217
EP - 238
JO - Remote Sensing of Environment
JF - Remote Sensing of Environment
IS - 3
ER -