Forest construction in the Tokachi river watershed wilderness area, in the Daisetsuzan National Park, northern Japan
1990
Haruki, M. (Hokkaido Univ., Sapporo (Japan)) | Itagaki, T. | Namikawa, K. | Ishikawa, Y.
The present paper, based on a study conducted for the most part in 1981, examines the forest types, stand structure and regeneration processes in the Tokachi River Watershed Wilderness Area, between 600 and 1,100 m in alt. This area belongs to the Daisetsuzan National Park, central Hokkaido, northern Japan, and is located in the typical northern subarctic coniferous forest zone. The percentage of coniferous stand and mixed stand, mainly composed of three major species, Picea jezoensis, Abies sachalinensis and Betula ernanii which changed the composite ratio, was 89% (911 ha) of the total. The coniferous stand was the larger of the two; 55% (567 ha). The mixed stand was 34% (351 ha). The percentage of broad-leaved stand which mainly comprised B. ermanii, Populus maximowiczii and Alnus hirsuta was 9.6% (100 ha) of the total wilderness area. From the points of stand structure and regeneration process of the coniferous stands and the mixed stands, it was found that the three major species had different characteristics in shade tolerance, growth rate, tree height and span of life. It was thought that P. jezoensis and A. sachalinensis had an advantage over B. ermanii under various regenerating conditions such as regenerating places, chances and changes of stand floor, consequently the conifers-dominant physiognomy has been kept up in this area
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