Ecological and palynological studies on the types and distribution of the Hiba Vitae (Thujopsis dolabrata var. hondai) forest

Var.本田，一个相对于第三个弧形的conifers，分布在日本东北部，从Noto Peninsula到喜马拉雅山，北海道北部，但在重雪下很明显。它通常以独特的森林形式混合，与Hiyana、Aomori等的Fagus Crenata混合。在Kitakami Massif的Tsuga Diversif，在北部Ou Mountains和Sado岛的日本低温下，Thujopsis的分布和增长明显受到雪压力的影响; Tress是，在日本典型的海洋气候与重雪落下，受到限制。当日本海洋气候和太平洋地区之间的地区过渡性-它们进入了更高的备选方案-Thujopsis的大残留物甚至是从晚期的沉积物和冰川避难所中被发现的：它可能是在亚脂蛋白质或Boreal Conifer森林和甚至在森林丛林区内存活的。Pollen分析研究也是在后恩典存款的一些基础上制作的。Thujopsis森林后的优雅变化被讨论为参考，以哪些机制为依据：Fagus·Thujopsis森林、Tsuga·Thujopsis森林和Cryptomeria·Thujopsis森林被建立在相应的生境条件下。

Var. Hondai, a relic of the arcto-tertiary conifers, is widely distributed in northeast Japan, from Noto Peninsula to Hiyama, Hokkaido in north, but scarcely under heavily snow-fallen climate. It often forms the unique forests, admixed with Fagus crenata in Hiyana, Aomori, etc., with Tsuga diversifolia in the Kitakami Massif, and with Cryotomeria japonica in the north Ou mountains and Sado Island.The distribution and growth of Thujopsis is apparently affected by the snow stress; the tress are, under the typical Japan Sea climate with heavy snow fall, restricted to the lowlands. While in the area transitional between the Japan Sea climate and the Pacific one they go up to the higher altitudes.The pollen or macro-remains of Thujopsis were detected even from the deposits of the late-Pleistocene and the glacial refugiz were recognized:it probably survived in the subalipine or boreal conifer forests and even in the forest tundra zone. The pollen analytical studies were also made on some of the post-gracial deposits. The post gracial changes of the Thujopsis forests were discussed in reference to the mechanism with which the Fagus・Thujopsis forest, the Tsuga・Thujopsis forest and Cryptomeria・Thujopsis forest were estabished under the respective habitat condition.