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Field Data Analysis
Emily L. Sayles
Student Airborne ResearchProgram
Photo: Shawn Kefauver
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Overview2 Sites in Californias Central Valley
Almond Orchard in Kern CountyCotton Field in Kings County
Collection of field data from July 20-25, 2009Two DC-8 research
flights over sites,uly 22 and 24, 2009Purpose of collecting ground
data:
Calibration of MASTER dataInputs for calculations of
Photo: SARP website
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Relevant Terms and Indices
Leaf Area Index (LAI)Leaf Area/Ground AreaDimensionless
value
Chlorophyll Content Index
(CCI)Measures optical transmission through a leaf
SPADMinoltas Special ProductsAnalysis DivisionMeasures
difference in
optical density through aleaf
Photosynthetically ActiveRadiation (PAR) - Apogee
Instruments,
Apogee Instruments,
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Instruments Used in theLAI Readings
LiCOR LAI-2000One above canopy (opensky)One below canopyTwilight
conditions neededConcentric ring sensors
Hemispherical
AccuPAROne abovecanopy (opensky)One belowcanopy
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Instruments Used in the
SPAD
Konica Minolta Spadmeter
2 sides of the tree (east,west)3 levels of canopy (low,
mid,high)4 leaves per side/canopylocation
6 readings per leaf
Photo: Shawn
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Summary of Field Data Collected and
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Analysis of HemisphericalThreshold Value
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Analysis of Hemispherical
Highly subjective processConcern for consistency2 HemiView
analyses per
hoto
Average LAI perphoto
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Agreement Between LAI Measurement
6 almond trees measured using both methodsHalf show good
agreement, half show poor
LAI-2000 and Hemispherical
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Correlation Between Chlorophyll Content and Leaf
Almond Trees
Expected monotonic relationship betweenCCI and LAIData from
photos show pretty well-defined
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Correlation Between Chlorophyll Content and Leaf
Cotton Field
Wide scattering of
data
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Nitrogen Treatment and LAI,CCI
Wide LAI and CCIranges for onenitrogen treatment
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Summary of Field Data
Limited data sets with little overlap
Correlation between LAI methods cannot be asserted
Good agreement with expected results for almond LAI vs. CCI
using photos
Rough correlation between almond LAI and CCI using LAI-
2000 (more scatter)
Significant scatter in cotton LAI vs. CCI
Rough correlation between nitrogen treatments and LAI, CCI
Only one factor among manyFuture work:
Analysis of AccuPAR LAI data
Consideration of water, other nutrients in analysis of
nitrogen treatments
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Acknowledgeme
NASA Student Airborne ResearchProgram
NSERCCSTARS, UC DavisShawn KefauverDr. Susan Ustin
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Questions
