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Remote Sensing and Ecophysiology Remote Quantification of Photosynthesis Measurement and Modeling: Portions of Literature Review Measurement Remote sensing Direct Measurements Leaf level estimations of Chl, N, Pn, etc. Ecosystem flux measurements Modeling CASA CENTURY PnET… etc. Egg

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remote sensing and ecophysiology

Remote Sensing and Ecophysiology

Remote Quantification of Photosynthesis

measurement and modeling portions of literature review
Measurement and Modeling:Portions of Literature Review
  • Measurement
    • Remote sensing
    • Direct Measurements
      • Leaf level estimations of Chl, N, Pn, etc.
      • Ecosystem flux measurements
  • Modeling
    • CASA
    • CENTURY
    • PnET… etc.
measurement and modeling cont

Egg

Chicken

Measurement and Modeling (cont.)

Data

Model

Induction

Deduction

francis bacon
Francis Bacon
  • Now although it be true, and I know it well, that there is an intercourse between causes and effects, so as both these knowledges, speculative and operative, have a great connection between themselves; yet because all true and fruitful natural philosophy hath a double scale or ladder, ascendent and descendent, ascending from experiments to the invention of causes, and descending from causes to the invention of new experiments; therefore I judge it most requisite that these two parts be severally considered and handled.

--From Of the Proficience and Advancement of Learning

the etymology of scale
The Etymology of “Scale”

Scale > Scala, ae (from scandere)

  • Stairway, allegorically stairway to heaven

Transformation of measurements from the selective to the synoptic

scale cont
Scale, cont.
  • Rastetter et al (2003)
    • Using mechanistic models to scale measurements through space and time
scaling ecological estimates
Scaling Ecological Estimates

Ollinger, Aber & Fedderer (1998)

what is needed for modeling e g what rs inputs
What is Needed for Modeling(e.g. what RS inputs)
  • Nitrogen-based Modeling
  • Photon-Use-Efficiency
  • Et cetera
what can we detect stress
What can we detect?Stress
  • Terrestrial plants are regularly stressed
  • Can detect responses to stress--
    • Conversion of carotenoids for heat dissipation
    • Dissipation of extra light through fluorescence
importance of photosynthetic pigments and more
Importance of Photosynthetic Pigments (and more!)
  • Chlorophyll estimation (also useful, as is often correlated with total foliar N)
  • Carotenoid Estimation
  • Fluorescence-based photosynthesis estimation
    • related to direct measurement of canopy productivity
    • Useful for PUE models (Freedman et al (2002)
problems with estimating fluorescence outside the chamber
Problems with estimating Fluorescence Outside the Chamber
  • Multiple Components to apparent reflectance signal:
    • Reflectance/ Fluorescence
    • Loss via transmittance
    • Loss via absorbance
problems with estimating fluorescence outside the chamber17

Incoming Solar Radiation

Leaf Reflectance Component

Chlorophyll Fluorescence

Component

Problems with estimating Fluorescence Outside the Chamber

Leaf

problems with estimating fluorescence outside the chamber18
Problems with estimating Fluorescence Outside the Chamber
  • Additional Problems
    • Leaves heterogeneous
    • Canopies Complicated
modeling of leaf reflectance and fluorescence
Modeling of Leaf Reflectance and Fluorescence
  • Zarco-Tejada et al (2000)
  • Dawson et al (1998)
  • PROSPECT (combined with SAIL), Haboudane et al (2003)
modeling fluorescence
Modeling Fluorescence

Zarco-Tejada et al (2000)

sail and prospect parameters
SAIL and PROSPECT Parameters

Haboudane et al (2002)

net pn vs red far red ratios
Net Pn vs. Red/ Far Red Ratios

Freedman et al (2002)

comparison of fluorescence ratios photosynthesis and stomatal conductance
Comparison of Fluorescence Ratios, Photosynthesis and Stomatal Conductance

Flexas et al (2002)

double peak
Double Peak

Zarco-Tejada et al (2001)

final comments
Final Comments
  • Fluorescence viable technique for canopy level estimation of Pn
  • Useful for estimation of Pn in realtime (model validation and tuning)
  • Useful toward PUE modeling
  • Nutrient Concentration Estimations possible (useful for PnET and other N driven models
further directions
Further Directions
  • Linkages between RS and models need to be explicitly sought for scaling between selective and synoptic estimations (deeper lit. on models)
  • “Direct” measurement components-- eddy-covariance biophysics and relevance to modeling process
heterogeneity of pn within leaves
Heterogeneity of Pn within Leaves

Lichtenthaler & Babani (2000)