Distribution Structure of Foliage and the Light Interception in a Young Cryptomeria japonica Stand
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概要
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Canopy profiles of crown-occupation area, foliage area, and light interception are modelled on the basis of crown measurement data for a young Cryptomeria japonica stand. The crown-occupation area reaches maximum just above base of the canopy and the distribution curve is remarkably skewed downward. The distribution density of foliage area rises to the peak below the middle of the canopy and shows a distribution curve skewed downward, whereas that of light interception reaches maximum near the middle of the canopy and depicts almost a symmetrical distribution curve with depth. Dividing the canopy into two parts by defining the boundary as the position where the distribution density of foliage area is maximum, the ratios of foliage area between the upper and lower canopies are 51:49 but those of light interception 73:17. On the other hand the ratios of foliage area among the upper-(height>15m), middle-(13<height_??_15m), and lower-story trees (height_??_13m) are 35:53:12, and those of light interception 48:47:5. It is noteworthy that the light interception by the tree individuals with heights above the stand average occupies more than 80% of the whole light interception by the canopy. The variation in light interception of the individual trees is due to the additive effects of the crown foliage area and the light interception per unit foliage area, where the former increases in proportion to the square of stem diameter at the crown base and the latter in proportion to the fourth power of tree height.
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