Permafrost occurrence in Hokkaido and related effect of climatic changes

对青藏高原多年冻土赋存状态进行了深入的野外调查。跆拳道是由这个项目的成员进行的。钻探的岩心是从冻结的地面上取出的。利用新研制的设备，利用钻孔测量了地面全年的温度分布。温度剖面的连续监测给出了土壤层的年平均温度梯度。温度梯度对冻土层的外推表明，多年冻土层位于550 cm深处。在平坦的山顶上观察到地面上有活跃的冻裂。霜裂宽度在一个冬季增加了1 cm。泥炭沼泽形成于泥炭沉积深度较大的区域，野外调查发现山体附近有地面冰体存在。太极。冰体的形成可能与全新世早期的大规模滑坡有关。

Intensive field investigations on permafrost occurrence in Mt. Taisetsu were conducted by members of this project. Boring cores were taken from the frozen ground. Using bored holes temperature profiles of the ground were also measured for whole year round with newly developed devices. Continuous monitoring of temperature profiles gives mean annual temperature gradients in soil layers. The extra-polation of temperature gradient to the frozen layers indicates that the permafrost table is located at 550cm depth. Active frost cracks on the ground surface were observed on the flat summits. The increase of the width of frost cracks were recorded as 1cm in one winter. The palsas were formed at the area where considerable depth of peat was deposited.The existence of ground ice-body was reported by field survey around Mt. Taisetsu. The genesis of ice-body may related with the large scale land slides at early Holocene.