Information from horizontal quantum sensor arrays and data on forest structure was used to measure photosynthetically active radiation (PAR). Forest sites with stands of similar age and land-use history were blocked into three valley, three mid-slope, and three ridge topographic positions. Analysis of forest structure and light measurements demonstrate: (1) canopy height and leaf area index decreased on progressing from valley to ridge; (2) total understory radiation increases on progressing from the valley to ridge; (3) sunflecks contribute a disproportionate amount of photosynthetic photon flux (PPF) on sunny days (40-80%) with number and duration of sunfleck periods increasing from valley to ridge. © 2003 Elsevier Science B.V. All rights reserved.
CITATION STYLE
Fladeland, M. M., Ashton, M. S., & Lee, X. (2003). Landscape variations in understory PAR for a mixed deciduous forest in New England, USA. Agricultural and Forest Meteorology, 118(1–2), 137–141. https://doi.org/10.1016/S0168-1923(03)00105-9
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