Canopy Reflectance at the Oklahoma ARM-CART Research Site
1998 Summary


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1998 Photos Updated March 1, 2000 

1998 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) Photos
Wheat Site (36.77 N, 97.13 W)
May 13, 1998 133 55, 40, 35, 25, 18 X
May 28, 1998 148 49.5, 45, 35, 25 X
Tall Grass Prairie (36.93 N, 96.68 W)
May 28, 1998 148 28, 35, 45, 55 X
June 23, 1998 174 15, 25, 35,45, 55 X
July 17, 1998 198 53, 45, 35, 25 X
August 16, 1998 228 55, 45, 35, 25 X

September 3/4, 1998

246/247 Canopy: 35, 45, 55 / Soil: 35,45,55 X

October 7, 1998

280 55, 45 X

Leaf Optical Properties

Date Day of Year Species or Plant Element
Wheat Site
May 13, 1998 133 Green leaves, Brown leaves, Grain head
May 28, 1998 148 Brown leaves, Green stem, Grain head
Tall Grass Prairie
May 28, 1998 148 Leaves: Indiangrass, Wild alfalfa, Goldenrod, Milkweed
June 23, 1998 174 Leaves: Indiangrass, Wild alfalfa, Goldenrod, Milkweed, Switchgrass, Little bluestem
July 16, 1998 197 Leaves: Indiangrass, Wild alfalfa, Goldenrod, Milkweed, Switchgrass, Little bluestem
August 16, 1998 228 Leaves: Indiangrass, Goldenrod, Switchgrass, Little bluestem
September 3, 1998 246 Leaves: Indiangrass (brown), Switchgrass (brown and green), Little bluestem (green) and Goldenrod (green)
October 7, 1998 280 Leaves (green): Indiangrass, Switchgrass, Little bluestem and Goldenrod

fAPAR

Date Day of Year Measurement Period (Local Time)
Wheat Site
May 13, 1998 133 900-1800
May 28, 1998 148 600-1300
Tall Grass Prairie
May 28, 1998 148 1445-1800
June 22, 1998 174 1000-1800
July 17, 1998 198 600-1400
August 16, 1998 228 600-1600
September 3/4, 1998 246/247 1515-1330
October 7, 1998 280 800-1500

 

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