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© 1996 Oxford University Press

RESEARCH-ARTICLE

Canopy structure measurement by gap fraction analysis using commercial instrumentation

Jon M. Welles1,3 and Shabtai Cohen2

1LI-COR Inc, 4421 Superior St., Lincoln, NE 68504, USA
2Department of Environmental Physics and Irrigation, Institute of Soils and Water, Volcani Center PO Box 6, Bet Dagan, Israel

3To whom correspondence should be addressed: + 1 402 467 2819. E-mail: jwe1les@env.LICOR.COM.

In the past few years, a number of systems for making indirect canopy structural estimates have become commercially available. These include linear sensors, such as the DEMON, line quantum sensors, and hemispherical sensors, such as the LAI-2000, the Leaf Laser, and the Cl-100. The performance of these instruments as reported in the literature is reviewed for forests, row crops, and individual trees.

Key words: Leaf area index, LAI-2000, DEMON, SunLink, SunScan, Ceptometer, AccuPAR, Cl-100, gap fraction, sunflecks, hemispherical photography


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