Effects of Crown Release on Basal Area Growth Rates of Some Broad-Leaved Tree Species with Different Shade-Tolerance

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We compare three or four years effects of crown release on stem growth rates among four deciduous broad-leaved tree species, Fagus crenata, Quercus crispula, Magnolia obovata and Acer mono, in an e\"en-aged coppice forest, central Japan. The crown release significantly improved relative growth rates for basal-area (RGR<BA>) of the four species. However the effects of neighboring gap area (GAPA) on the RGR<BA> differed among the species. The effects were slgnificant for Q. crispula and M. obovata, indicating that growth rates of these two species increase with intensity of the crown release. In contrast, the RGR<BA> of F. crenata and A. rl7,0no were not correlated with the GAPA, suggesting that their growth rates are unrelated to the intensity. We considered that such differences among species were closely related to their photosynthetic characteristics of light use; less-tolerant species (Q. crispula and M. obovata) exhibit greater growth rates relative to the intensity of crown release than tolerant species (F. crenata and A. mono). Based on these results, we proposed implications for thinning practices in mixed forests of species with different shade-tolerance.
日本森林学会の論文
1998-08-16