EARTHSC 2C03 Lecture Notes - Lecture 17: Trailing Edge, Water Potential, Leading Edge
15 Feb 2017
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Climate of vegetated surface: leaves (a) radiation budget: Leaves are not opaque to short-wave radiation. The disposition of incident radiation is given by: The reflection ( ), transmission ( ) and absorption ( ) depends on interior leaf structure and the radiative properties of the main plant pigments (especially chlorophyll and carotenoids). The radiative properties of leaves are wavelength dependent (see. Almost equal portions of incident radiation are reflected from and transmitted through the leaf because of the cellular structure of the leaf. The waveband between 0. 40 and 0. 70 m is called photosynthetically active radiation (par). The leaf pigments are very effective absorbers in the blue (0. 40 to. 0. 51 m) and red (0. 61 to 0. 70 m) bands of the visible portion of the electromagnetic spectrum. There is a small relative peak of reflection and transmission between. 0. 5 and 0. 55 m which is in the green portion of the visible band and explains the green colour of vegetation.
