森林立地学会誌 森林立地38(2), 1996, 115～122
資 料
ベトナム北部山地，バヴィ国立公園における森林の分布
斉 藤 昌 宏
Masahiro
SAITO: Distribution of forest vegetation
in the Ba Vi National Park. northern mountain area of Vietnam. Jpn. J. For.
Environment 38, 115-122, 1996
The present state of the forest
vegetation was surveyed in the Ba Vi National Park situated approximately 50 km
west of Hanoi. The Ba Vi mountains including the National Park is located about
21°in north latitude, and have much rain
fall of about 2000 mm/yr. Well-preserved sub-tropical forests are remained from
the summit area (over 1200 m) to 800 m in altitude. From 600 m to 400 m in
altitude, sub-tropical forests are degraded by severe selective cuttings, and
most of the stands are invaded by much creeping bamboo. In the area bellow 400
m in the National Park, only small fragments of low montane tropical rain
forests are remained. Conifer species such as Calocedrus macrolepis, Fokienia
hodginsii and two species of Podocarpus
are distributed on rocky ridges and upper slope near the two peaks, Dinh Ngoc
Hoa and Den Thuong. Sub-tropical ever green forests widely spread on upper
part, over 800 m, of the mountains. Forest stands which are mainly composed of
some Fagaceae species, and often
accompanied with Arundinaria baviensis,
establish above l200 m in altitude. The Fagaceae
species and the Lauraceae species
are not only distributed widely, but also dominated in the sub-tropical forests
from 1200 m to 800 m in altitude. It is found out that species compositions of
these forests become more complex as lower in altitude. Results of soil
observation suggested that the area has low nutrient and shallow soil because
of heavy rain fall and steep slope.