Stand structure and growth patterns of the Fraxinus longicuspis Sieb. et Zucc. plantations
2009
Suzaki, T.(Japan. Forestry Agency, Hiratsuka, Kanagawa. Tokyo-Kanagawa District Forest Office) | Hirano, T. | Suzuki, W.
The stand structure of two 93-year-old Fraxinus longicuspis plantations and the growth pattern of this species were studied for establishing a silviculutural system, with special attention paid to the practical history. Well developed stand of this species showed high tree density (617 stems/ha) and large stem volumes (353 cubic m/ha), which accounted for 27.0% and 81.7%, respectively, of the total. In contrast, the silviculturally unsuccessful stand showed only 220 stems/ha in tree density, and 62 cubic m/ha in stem volume. According to the stem analysis, F. longicuspis reached its diameter and height growth peaks at 40 years old, and then gradually decreased. This plantation has been subjected to weeding, vine cutting and selective cutting since planting, including the thinning of about 25% of the stem volume at 40 years old. Therefore, by selectively cutting this relatively slow-growing species, and reducing competition with other broad-leaved tree species, it may become possible to establish robust plantations of Fraxinus longicuspis.
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