Efficacy of oxygen-supplying capacity of Azolla in a controlled life support system

文献类型： 外文期刊

第一作者： Chen, Min

作者： Chen, Min;Deng, Sufang;Yang, Youquan;Huang, Yibing;Liu, Chongchu

作者机构：

关键词： Azolla;Closed cabin;Controlled Ecological Life Support System;Manned test;Oxygen supply;Photosynthesis

期刊名称：ADVANCES IN SPACE RESEARCH （ 影响因子：2.152； 五年影响因子：1.978 ）

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收录情况： SCI

摘要： Azolla shows high growth and propagation rates, strong photosynthetic O_2-releasing ability and high nutritional value. It is suitable as a salad vegetable and can be cultured on a multi-layered wet bed. Hence, it possesses potential as a fresh vegetable, and to release O_2 and absorb CO_2 in a Controlled Ecological Life Support System in space. In this study, we investigated the O_2-providing characteristics of Azolla in a closed chamber under manned, controlled conditions to lay a foundation for use of Azolla as a biological component in ground simulation experiments for space applications. A closed test chamber, representing a Controlled Ecological Life Support System including an Azolla wet-culture device, was built to measure the changes in atmospheric O_2 and CO_2 concentrations inside the chamber in the presence of coexisting Azolla, fish and men. The amount of O_2 consumed by fish was 0.0805-0.0831 L kg~(-1) h~(-1) and the level of CO_2 emission was 0.0705-0.0736 L kg~(-1) h~(-1); O_2 consumption by the two trial volunteers was 19.71 L h~(-1) and the volume of respiration-released CO_2 was 18.90 L h~(-1). Under 7000-8000 Lx artificial light and Azolla wet-culture conditions, human and fish respiration and Azolla photosynthesis were complementary, thus the atmospheric O_2 and CO_2 concentrations inside chamber were maintained in equilibrium. The increase in atmospheric CO_2 concentration in the closed chamber enhanced the net photosynthesis efficiency of the Azolla colony. This study showed that Azolla has strong photosynthetic O_2-releasing ability, which equilibrates the O_2 and CO_2 concentrations inside the chamber in favor of human survival and verifies the potential of Azolla for space applications.

分类号： V1

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