| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 97 === ABSTRACT
The CO2 absorption during night hours of a Crassulacean Acid Metabolism Plant and its release internally to support the next daytime photosynthes offers a peculiar function to reduce night time CO2 concentration within house in sloping area. The further application on such a characteristics needs the followed three information: What kind plant species is available? What are the thresholds of such a function for the given species? What is the best strategy to operate the related information?
This report selected traveler’s tree as the target species due to easy care, even green, and beautiful shape. In an isolated and closed room, three conclusions are reached for under the condition of no human occupation as follows: (1) CO2 concentration of this room tends to have a lower value due to low temperature at the midnight, (2) the post one hour CO2 concentration between with(case A) and without (case B) two traveler’s trees departs larger when time stepped to midnight if the initiated CO2 concentration are at background or at 2,000ppm levels, and (3) The departure of post one hour CO2 concentration between case A and case B becomes neglected, if the initiated CO2 concentration is at 4,000ppm level. However, the above findings is no longer existed under the case of one person occupation no matter what CO2 concentration level initiated, while a ceiling value of about 5,800ppm is instead found. This seems due to high CO2 concentration level, say 45,000ppm, and high moisture content of human breaths. The talent owned by the plant shows the important threshold it will act. The native species, therefore, should be paid with more attention.
On the total adsorption amount of upper half night, two traveler’s tree display 20% of background concentration level. It will increase the total adsorption amount if more plants were moved in. CO2 concentration and energy reduction, is expected to make a great value in this case.
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