EVALUATION OF THE EFFECT OF FOREST DESTRUCTION ON WATER CYCLE

首席研究员冢本义则与澳大利亚詹姆斯库克大学高级讲师Mike Bonell博士进行了合作研究。他们调查了澳大利亚昆士兰州热带森林中巴宾达流域的水文研究数据。研究了径流和土壤导水率的变化，并与其他热带流域进行了比较;竹下敬二研究了森林破坏与径流循环变化和土壤侵蚀的关系，并与希腊、新西兰和印度尼西亚进行了比较研究;木之平裕吉研究了森林利用与保护的兼容性。他提出了一个考虑到保护森林生态系统多样性和生产可持续性的森林规划镶嵌模型。小川茂调查了森林火灾对森林生态系统的破坏。调查了森林火灾对动植物生态系统、对土壤、对暴雨径流和对大气的影响。福岛义弘论述了明治时代以后日本森林破坏和荒地扩张与进步的社会背景。他通过模拟模型展示了裸露山坡上的雨水径流量与森林覆盖的山坡相比有所增加。岩坪五郎调查了森林覆盖的流域中矿物质和有机物质的收支。他研究了溶解性物质的垂直运动和变化，以及森林土壤对污染水的净化和截留功能。小仓宪夫讨论了全球范围的环境破坏，举例说明了海水污染、森林砍伐对河流水质的影响以及酸雨和气候变暖对森林破坏的影响。

The head investigator, Tsukamoto Yoshinori, carried out corporative research with Dr. Mike Bonell, Senior Instructor of James Cook University in Australia. They investigated hydrologic research data of Babinda watersheds in tropical forest in Queensland, Australia. The change of runoff and the hydraulic conductivity of soil were investigated and compared with other tropical watersheds.Takeshita Keiji investigated the relationship between forest destruction and the change of runoff cycle and soil erosion, illustrating comparative study in Greece, Newzealand and Indonesia.Konohira Yuukichi investigated the compatibility of utilization and conservation of forest. He presented a mosaic model of forest planning for logging, considering the conservation of variety of forest ecosystem and sustainability of production.Ogawa Shigeru investigated the destruction of forest ecosystem by forest fire. The effect of forest fire on animal and plant ecosystem, on soil, on storm runoff and on atomosphere was investigated.Fukushima Yoshihiro discussed the social background of forest destruction and expansion and progress of bareland in Japan after Meiji era. He demonstrated the increase of storm runoff on a bareslope compared to that of a forested slope by using his simulation model.Iwatsubo Gorro investigated the budget of mineral and organic substances in a forested watershed. He investigated the vertical moverment and change of dissolved substances and purification and trapping function of forest soil for polluted water.Ogura Norio discussed the environmental destruction of global scale, illustrating sea water pollution, the effect of forest logging on streamwater quality and the effect of acid rain and climatic warming on forest destruction.