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Vegetation history in Ohsado Mountains at Sado Island

佐渡岛大佐渡山的植被历史

基本信息

批准号：
03660149
负责人：
NAKATA Makoto
金额：
$ 1.47万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

In Ohsado Mountains, Cryptomeria japonica forests distributed upper than ca.700m on clayy soil materials, where air humidity and soil moisture were very high. Wet iron podzols or Dry podzols were formed at the forests. Whereas, Thujopsis dolabrata var. hondae forests distributed lower than ca.700m on relativery sandy and dry soil materials, where air humidity was rather low. Dry slightly pozolic soils were formed at the forests. Fagus crenata forests distributed at high altitudes of Mt. Kinpoku, where air humidity was intermediate between former two forest types. High altitude types of Brown forest soils were formed at the forests. The degree of podzolization and soil chemical properties of upper horizons showed clear differences among these three forest types.In the mixed forest consisted of Cryptomeria japonica and deciduous tree species, large-sized investigation plot was set up on the west slope of Mt. Bunagahira, where location, sizes and crown structure of all trees including dead or cut stumps were measured. Quercus mongolica var. grosseserrata grew near the cut stumps of Cryptomeria japonica. Formely, several tree species such as Cryptomeria japonica or Acer mono were cut down for the man's benefit in Osado Mountains. Therefore, present forest structure was storongly affected by past man's activities.Pollen analysis was carried out using samples collected from three different sites in Ohsado regions. One of them was a forested site consisted of Cryptomeria japonica, where Ericaceae shrubs and ferns dominated about 200 or 250 years ago. From the sample collected at Kuninaka Plain, vegetation changes of last 1500 years were showed.

在Ohsado山区，柳杉林分布在约700m以上的粘土质土壤上，空气湿度和土壤湿度都很高。湿铁灰土或干灰土在森林中形成。而在相对沙质和干燥的土壤材料上，空气湿度较低的地方，红杉林分布在约700m以下。在森林中形成了干燥的轻度含磷土壤。油桐林分布在金宝山高海拔地区，空气湿度介于前两种林型之间。在森林中形成了高海拔类型的棕色森林土壤。三种森林类型的上层土壤灰化化程度和土壤化学性质存在明显差异。在日本柳杉与落叶树混交林中，在Bunagahira山西坡设置了大型调查样地，测量了所有树木的位置、大小和树冠结构，包括死树桩和砍树桩。蒙古栎生长在日本柳杉砍下的树桩附近。以前，为了这个人的利益，一些树种，如日本柳杉或槭被砍伐。因此，现在的森林结构受到过去人类活动的强烈影响。花粉分析使用从Ohsado地区三个不同地点收集的样本进行。其中一个是由日本柳杉组成的森林遗址，大约200或250年前，这里的Ericaceae灌木和蕨类植物占主导地位。从国中平原采集的样本中，显示了近1500年来的植被变化。