Geomorphological and environmental development of the Kamikochi Basin and neighboring mountain area on the basis of 300m depth drilling core analysis.

北方日本阿尔卑斯山上高知盆地的极平坦地形是12，000年BP的结果。八岳岳火山的火山喷发对古梓川的堵塞，古上高知湖沉积了厚达180 m的湖相沉积物。通过对上口内盆地沉积物岩芯的花粉分析，发现由于寒冷的影响，湖周围最初植被较差。随着气候变暖，先锋林逐渐发展起来。11000 ~ 9000y.BP，亚北极针叶树从低海拔地区逃逸的数量增加，9000 ~ 4000y.BP，以毛毛豆和栎属为主的落叶阔叶林数量增加。

Extremely plane topography of the Kamikochi Basin in the Northern Japan Alps was a result of 12,000 y.BP. damming up of the Paleo-Azusa river by volcanic eruption of the Yakedake Volcanoes, and thick lacustrine sediment (180m in thick) deposited in paleo-Kamikochi Lake. Based on pollen analysis of the sediment core drilled at Kamikouchi basin, there was poor vegetation around the lake at first because of cold. The pioneer forest has gradually developed withwarming. From 11000 to 9000 y.BP, subarctic conifers escaped from the lower areas increased.From 9000 to 4000 y.BP, deciduous broadleaved forest dominated by Fagus crenata and Quercus(Lepidobalanus) increased.