Scaling up of the physiology^based response of cool-temperate forest ecosystems to disturbance and environmental change.

扩大寒温带森林生态系统对干扰和环境变化的生理响应。

基本信息

批准号：
13304060
负责人：
KOHYAMA Takashi
金额：
$ 28.79万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

This project aimed to describe the overall mechanism at forest ecosystem scale response to global change. Setting mixed cool-temperate deciduous broad-leaved forests as main target ecosystem, we scaled up from organ-based physiological processes to a whole individual growth and community dynamics used quantitative theoretical models based on field observation.Experiments were carried out at various scales ; e.g. open-top CO_2 enrichment systems on experimental field to fertilization/logging experiment on forest ecosystem. At every scale physiological response to treatment or disturbance was species specific. We described the differential response cascade explaining species difference. Physiology-based model of foliage photosynthesis was extended to include nitrogen-limitation.Shoot-module-based analysis of three-dimensional tree formation processes was carried out using Magnolia obovata and the genus Abies as model trees. We extracted branching role of M.obovata. Short-shoot type lateral branches were commonly formed, of which significance, clarified through simulation experiments, was not to reduce mutual shading but to reduce assimilate use due to the overall shortage of photosynthetic production. Population-level development of Abies stands was simulated using PipeTree, a shoot-based, physiological simulator. The simulation suggested that single shoot characteristics need to be changed with height, through water potential change, so that observed phenomena of even-aged population development.

该项目旨在描述森林生态系统量表对全球变化的反应的总体机制。将混合凉爽的落叶阔叶森林设置为主要目标生态系统，我们从基于器官的生理过程扩展到整个个体生长和社区动态，使用了基于现场观察的定量理论模型。例如在森林生态系统上受精/记录实验的实验领域上的开放式CO_2富集系统。在每个规模上，对治疗或干扰的生理反应都是特定于物种的。我们描述了解释物种差异的差异响应级联反应。扩展了基于生理的叶子光合作用的模型，包括氮限制。基于模块模块的三维树形成过程的分析是使用木兰obovata和作为模型树的属于模型树进行的。我们提取了M.Obovata的分支角色。通常形成短期类型的横向分支，通过模拟实验阐明的意义不是减少相互阴影，而是由于光合作用产生的总体短缺而减少同化的使用。使用基于芽的生理模拟器Pipetree模拟了ABIES展位的人口级的发展。模拟表明，需要通过水的潜在变化来改变单个芽特征，以便观察到的均匀人口发展现象。