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Vegetation dynamics and environmental change in the ecotonal zone of upper subalpine belt on Mount Fuji

富士山亚高山上带生态带植被动态与环境变化

基本信息

批准号：
14580104
负责人：
OKA Shuichi
金额：
$ 1.66万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14580104/
关键词：
Mount Fuji vegetation change tree limit vegetation dynamics tree ring freezing and thawing stepped micro-relief soil moisture 生長量砂礫移動

项目摘要

The purpose of this study is to reveal the vegetation dynamics and its environmental agents in the ecotonal zone of upper subalpine belt on Mount Fuji. On the northwest slope, we conducted the following vegetation and environmental surveys: measurement of tree height and DBH, core sampling for tree ring analysis, surveying of topography, observation of air and soil temperatures and solar radiation, and so on. As a result, we could understand the tree height became lower, as the altitude grew higher with discontinuity. The tree height should match with the environmental gradient but with one's own age.On this slope, a conspicuous stepped microrelief which might influence the vegetational distribution pattern is developed. Analyzing the process of this step formation seems to be deeply concerned with making clear the variation of vertical vegetation zone. In order to clarify the process of step formation, we have set two paint-lines on the step at 2800m asl. About a year after, we checked the movement of gravels along the paint-lines. They did move a little only on a step terrace but a cliff. According to the meteorological data at the study site, a freezing or thawing period which should control the peri glacial phenomenon is very short. Based on the larch growth form in this area, it should be blown constantly strong southeasterly. So, the step should be formed by wind-force and/or flow of water.Furthermore, it's necessary to examine the relationship between the plant establishment and the environmental factors.

本研究旨在揭示富士山上亚高山带生态交错带的植被动态及其环境因子。在西北坡进行了树高和胸径测量、树轮取样分析、地形测量、气温、土壤温度和太阳辐射观测等植被和环境调查，结果表明，随着海拔的升高，树高逐渐降低，但具有不连续性。树高应与环境梯度相匹配，而与自身年龄相匹配。分析这一台阶的形成过程，似乎与弄清植被垂直带的变化密切相关。为了弄清台阶的形成过程，我们在海拔2800米的台阶上设置了两条油漆线。大约一年后，我们检查了砾石沿着油漆线的移动。他们确实只在一个台阶上移动了一点，但在悬崖上。根据研究地点的气象资料，控制复冰期现象的冻融期很短。根据该地区落叶松的生长形态，应持续吹强东南风。因此，该台阶应该是由风力和/或水流形成的。此外，有必要研究植物建立与环境因素之间的关系。