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• W2048046664 abstract "The spectral quality of radiation in the understory of two neotropical rainforests, Barro Colorado Island in Panama and La Selva in Costa Rica, is profoundly affected by the density of the canopy. Understory light conditions in both forests bear similar spectral characteristics. In both the greatest changes in spectral quality occur at low flux densities, as in the transition from extreme shade to small light flecks. Change in spectral quality, as assessed by the red: far-red (R:FR) ratio, the ratio of radiant energy 400-700: 300-1100 nm, and the ratio of quantum flux density 400-700:300-1100 nm, is strongly correlated with a drop in percentage of solar radiation as measurable by a quantum radiometer. Thus, by knowing the percentage of photosynthetic photon flux density (PPFD) in relation to full sunlight, it is possible to estimate the spectral quality in the forest at a particular time and microsite. KNOWLEDGE OF LIGHT CLIMATES OF tropical rainforests is a necessary background for understanding the physiological ecology of plants growing in them (Mooney et al. 1980). The slow progress in the analysis of light climates of these forests is due to their inaccessibility, to a previous lack of instrumentation suitable for field measurements, and to the heterogeneity of light conditions within forests (Anderson 1970, Idso & de Wit 1970, Reifsnyder et al. 1970, Hutchison et al. 1980). Recent studies on radiation levels in forests have concentrated on the radiation available for photosynthesis (400-700 nm). Chazdon and Fetcher (1984a) have described photosynthetic light environments at a rainforest site in Costa Rica, and Pearcy (1983) has studied the light climate in a Hawaiian forest. In these forest understories, brief sun flecks may contribute well over 50 percent of daily photosynthetic flux density. The importance of the spectral alteration of solar radiation passing through foliage to the development and ecology of plants is coming to be more widely appreciated (Smith 1982). Leaves typically transmit and reflect little radiation in the visible wavelengths (400-700 nm), and do the opposite for wavelengths beyond 750 nm (Fig. 1). Absorptance of radiation by leaves and plant canopies is a function of these two properties (absorptance = 1 reflectance transmittance). Therefore, greater canopy density or thickness should spectrally alter the incident solar radiation to a greater extent. A growing body of literature documenting the effects of altered R:FR ratios on plant development (Child et al. 1981, Smith 1982) suggests that such changes in the spectral quality of radiation may partly control development in understory plants. Developmental features that may be especially important are those of germination (Vasquez-Yanes 1980, Frankland 1981), stem extension (Morgan & Smith 1980), leaf morI Received 2 July 1985, revision accepted 24 October 1985. phology (Hebant & Lee 1984), and juvenility (Madison" @default.
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• W2048046664 date "1987-06-01" @default.
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• W2048046664 title "The Spectral Distribution of Radiation in Two Neotropical Rainforests" @default.
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• W2048046664 doi "https://doi.org/10.2307/2388739" @default.
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