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| Free-air concentration enrichment ： ウィキペディア英語版 |
Free-air concentration enrichment
Free-Air Carbon dioxide Enrichment (FACE) is a method used by ecologists and plant biologists that raises the concentration of in a specified area and allows the response of plant growth to be measured. Experiments using FACE are required because most studies looking at the effect of elevated concentrations have been conducted in labs and where there are many missing factors including plant competition. Measuring the effect of elevated using FACE is a better way of estimating how plant growth will change in the future as the concentration rises in the atmosphere. FACE also allows the effect of elevated on plants that cannot be grown in small spaces (trees for example) to be measured.
==Method==
Horizontal or vertical pipes are placed in a circle around the experimental plot, which can be between 1m and 30m in diameter, and these emit enriched air around the plants. The concentration of is maintained at the desired level through placing sensors in the plot which feedback to a computer which then adjusts the flow of from the pipes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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