Canopy Reflectance at the Oklahoma ARM-CART Research Site
2000 Summary


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Updated August 17, 2000 

2000 Summary for Canopy Bidirectonal Reflectance and Related Field Measurements in Native Tallgrass Prairie and Wheat Ecosystems in Oklahoma

Canopy & Soil Reflectance 

Date Day of Year Apparent Solar Zenith Angles (degrees)
Wheat Site (36.77 N, 97.13 W)
April 7, 2000 98 35, 45, 55
April 14, 2000 105 35, 45, 55
May 10, 2000 131 55, 45, 35, 25
August 25, 2000 238 Soil: 55,45,35
Tall Grass Prairie (36.93 N, 96.68 W)
May 10, 2000 132 25, 35, 45, 55
May 28, 2000 149 55,45,35,25
June 8, 2000 160 15, 25, 35, 45, 55
July 6-7, 2000 188-189 188:15, 25,  
189:  55, 45, 35 
August 1, 2000 214 Canopy:  55, 45, 35, 25
Soil: 25, 35
August 25, 2000 238 45, 55
October 1-2, 2000 275-276 Canopy (275): 45, 55
Soil ( 276): 55, 45

Leaf Optical Properties

Date Day of Year Species or Plant Element
Wheat Site (36.77 N, 97.13 W)

April 7, 2000

98

Green leaves
April 14, 2000 105 Green leaves
May 10, 2000 131 Green and Brownish-Yellow Leaves & Grain Head
Tall Grass Prairie (36.93 N, 96.68 W)
May 10, 2000 132 Wild Alfalfa, Goldenrod, Milkweed, Indiangrass, Switchgrass
May 28, 2000 149 Wild Alfalfa, Goldenrod, Milkweed, Indiangrass, Switchgrass, Little Bluestem
June 8, 2000 160 Wild Alfalfa, Goldenrod, Milkweed, Indiangrass, Switchgrass, Little bluestem, Big Bluestem
July 6-7, 2000 188-189 Goldenrod, Indiangrass, Switchgrass, Little Bluestem, Big Bluestem
August 1, 2000

214

Goldenrod, Indiangrass, Switchgrass, Little Bluestem, Big Bluestem
August 25, 2000 238 Indiangrass, Switchgrass, Little Bluestem, Goldenrod
October 1, 2000 275 Indiangrass(green & brown), Switchgrass(green & brown), Goldenrod

fAPAR

Date Day of Year Measurement Period (Local Time)
Wheat Site
Continuous from April 9 to May 20 (DOY 100 to 141)
Tall Grass Prairie

Continuous since April 9 to Nov 4 ( DOY 99 to 309 )

 

Copyright 1998-2000.

Information contacts:
Dr. Elizabeth Walter-Shea: ewalter-shea1@unl.edu or 402-472-1553 or 402-472-3679
Mr. Mark A. Mesarch: mmesarch1@unl.edu or 402-472-5904

School of Natural Resource Sciences; University of Nebraska-Lincoln
246 LW Chase Hall
Lincoln, NE 68583-0728