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Enhancing the Precision and Spatial Acuity of Point Quadrat Analyses via Calibrated Exposure Mapping

¹ Graduate student, Cornell University, Field of Horticulture, 134A Plant Sciences Building, Ithaca, NY 14853; ² Assistant professor of viticulture, Cornell University, Department of Horticultural Sciences, 630 W. North Street, Geneva, NY 14456, and Department of Horticulture, Plant Sciences Building, Ithaca, NY 14853.

^* Corresponding author (email: jmm533{at}cornell.edu; fax: 607 255-0599)

Modeling canopy sunlight environments requires precise measurements of biomass distribution and photon flux distribution (PFD). However, customary methods for obtaining these measurements are limited in their precision and practicality. Point quadrat analysis (PQA), the standard for canopy architecture, is limited in spatial precision and the lack of calibration; while measurement of PFD across an entire canopy typically requires rigorous sampling protocols. New methods are introduced that combine PQA and photon flux measurements into a calibrated biomass and PFD model. These techniques, applied to sample data from a shoot-thinning study, revealed quantitative descriptions of canopy biomass distribution, light environment, and treatment efficacy.

Key words: light attenuation, light interception, biomass distribution, canopy management, shoot thinning

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