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Bio-filtering and gas circulation in closed ecosystems

封闭生态系统中的生物过滤和气体循环

基本信息

批准号：
05454104
负责人：
TAKAKURA Tadashi
金额：
$ 4.1万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05454104/
关键词：
Closed ecosystems Gas circulation Variation of oxygen concentration 酸素濃度

项目摘要

Through the study of the nature of closed ecosystems, the final goal of the present study is to investigate the ecological balance of the living earth where we live. The earth itself is alive because of having many living creatures on it. It is believed that the present situation of the earth is maintained because many living creatures in its biosphere control the earth environment.The closed ecosystems in the present research are the systems which are isolated regarding gas and water exchange but are not energetically. Solar radiation is the energy source to the system. The purpose of the present study is to investigate the balance of the system under the change of outside environment or the change of inside ecosystems.The desiccator made of polycarbonate whose volume is 20L was used for an encapsulated ecosystem vessel and it consisted of soil, pebble, three kinds of aquatic plants, and three shrimps of 10 to 20mm long. The initial oxygen concentration levels were 10.1,20.2 and 30.3% for 10,20, and 30% sections, respectively. Measurement of oxygen concentration was made by an oxygen meter and carbon dioxide concentration was checked by a gas-chromatograph. The total observation was carried out for 84 days. Up to 54th day from the starting day, it was verified that shrimps were alive. An aquatic plant has changed its color gradually and after 40th day there was no green in the vessel. Another kind of aquatic plant grew considerably. The oxygen concentrations in the vessels of 10 and 20% increased, on the other hand, it decreased in the vessel of 30%.

通过对封闭生态系统性质的研究，本研究的最终目标是调查我们所居住的生命地球的生态平衡。地球本身是有生命的，因为地球上有许多生物。人们认为，地球的现状得以维持，是因为生物圈中的许多生物控制着地球环境。本文研究的封闭生态系统是指在气、水交换方面处于隔离状态，但不进行能量交换的系统。太阳辐射是该系统的能量来源。本研究的目的是探讨系统在外部环境变化或内部生态系统变化下的平衡。用体积为20L的聚碳酸酯制成的干燥器，由土壤、鹅卵石、3种水生植物、3只长10 ~ 20mm的小虾组成，作为封闭的生态系统容器。10、20和30%切片的初始氧浓度分别为10.1、20.2和30.3%。用氧计测定氧的浓度，用气相色谱仪测定二氧化碳的浓度。共观察84 d。从第一天开始到第54天，证实虾是活的。一种水生植物逐渐变色，40天后容器里没有绿色。另一种水生植物生长迅速。10%和20%的血管中氧浓度升高，30%的血管中氧浓度降低。