Fluorescence Responses on Step Changes in Irradiance by Plants from Different Light Habitats
Plants growing in different natural habitats experience light conditions that vary considerably in intensity, spectral quality and dynamic properties. Plants growing in the open will receive full sun for much of the time, with relativly little short term temporal variation. Leaves within a plant canopy will be exposed to rapidly fluctuating irradiance varying, both in quality and quantity, with leaf movement (1). Plants growing in an understorey will mainly receive light that has been leaf-filtered but this ambient low light will be punctuated by sunfleeks as the sun passes over gaps in the canopy. These will vary in length from a few seconds to several minutes being affected by the density of tree cover and air movement (2).
KeywordsSaturate Pulse Actinic Light Leaf Movement Excess Irradiance Light Plant
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