FAHM (Free Air Humidity Manipulation) experimental site

is created by ecophysiologists and applied ecologists of the University of Tartu to investigate the impact of elevated air humidity on trees and forest ecosystem functioning


The experimental site (58°14′N, 27°18′E) is located within the Järvselja Training and Experimental Forest District in the village of Rõka, Tartu county, Estonia. The air humidity is manipulated in young deciduous (silver birch and hybrid aspen) forest stands through misting water under high pressure. Such technology enables to increase air relative humidity up to 18% unit above ambient level. The whole experimental area is 2.7 h in size and contains 9 experimental plots. 

Contact: Priit Kupper (