PT  - JOURNAL ARTICLE
AU  - Meyers, James M.
AU  - Vanden Heuvel, Justine E.
TI  - Enhancing the Precision and Spatial Acuity of Point Quadrat Analyses via Calibrated Exposure Mapping
AID  - 10.5344/ajev.2008.59.4.425
DP  - 2008 Dec 01
TA  - American Journal of Enology and Viticulture
PG  - 425--431
VI  - 59
IP  - 4
4099  - http://www.ajevonline.org/content/59/4/425.short
4100  - http://www.ajevonline.org/content/59/4/425.full
SO  - Am J Enol Vitic.2008 Dec 01; 59
AB  - 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.