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Effects of environmental change on terrestrial ecosystem from the point of calcium dynamics

从钙动力学角度探讨环境变化对陆地生态系统的影响

基本信息

批准号：
08308030
负责人：
KOJIMA Satoru
金额：
$ 3.78万
依托单位：
Tokyo Woman's Christian University (1998)University of Toyama (1996-1997)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

This project aimed to analyze pattern and dynamic processes of biogeochemical cycles of calcium in terrestrial ecosystems. It was assumed that calcium was one of the key elements regulating dynamic ecological processes of terrestrial ecosystem. The project was initiated in the 1996 fiscal year and terminated in the 1998 fiscal year. Ten research scientists of different disciplines were participated in the project. The field analyses were conducted covering a wide geographical range from Hokkaido (Teshio Experimental Forest of Hokkaido university) to Kyushu (Yakushima Island). Major findings included ; 1. In Hokkaido, soils were generally poor in calcium and airborne particles were an important source of calcium, 2. It became apparent that analytical technique using Sr isotopes was effective to detect origin of calcium in terrestrial ecosystem. 3. Vegetation structure and soil characteristics were greatly influenced by topographical position and, in turn, vegetation and soils largely regulated chemical properties of water infiltrating through phytogeocoenoses. 4. Calcium was found to be a prime factor, synergistically with topographical position, regulating and determining ecological characteristics of cool temperate forest phytogeoceonoses. 6. Through decomposition experiments of leaf litter, it was found that calcium concentration of fallen litter tended to become converge to a certain level as the decomposition progressed, no matter how high or low the concentration was at the beginning of experiment due to litter species.

本项目旨在分析陆地生态系统中钙的地球化学循环模式和动力学过程。钙是陆地生态系统动态生态过程的重要调控元素之一。该项目于1996财政年度开始，1998财政年度结束。10名不同学科的研究科学家参加了该项目。实地分析覆盖了从北海道（北海道大学的天潮实验森林）到九州（屋久岛）的广泛地理范围。主要发现包括：1。在北海道，土壤中普遍缺乏钙，空气中的颗粒物是钙的重要来源。显然，使用Sr同位素的分析技术可以有效地检测陆地生态系统中钙的来源。3.植被结构和土壤特性的地形位置的影响很大，反过来，植被和土壤在很大程度上调节水渗透通过植物群落的化学性质。4.钙是一个主要因子，与地形位置协同作用，调节和决定了冷温带森林植物地理海洋病的生态特征。6.通过凋落叶分解试验发现，由于凋落物种类的不同，无论凋落物钙浓度在试验初期是高还是低，随着分解的进行，凋落物钙浓度都趋于收敛到一定水平。