Before revision: 285x285px|FAHM experimental area 283x283px|One of the humidification plots Free Air Humidity Manipulation (FAHM) experiment is a large-scale field experiment established by plant biologists (ecophysiologists and applied ecologists) of the University of Tartu to investigate the long term effects of increasing air humidity on tree performance and on the functioning of the deciduous forest ecosystem.
After revision: in Estonia,FAHM was285x285px|FAHM experimental area 283x283px|One of the humidification plots Free Air Humidity Manipulation (FAHM) experiment is a large-scale field experiment established by plant biologists (ecophysiologists and applied ecologists) of the University of Tartu to investigate the long term effects of increasing air humidity on tree performance and on the functioning of the deciduous forest ecosystem.