Abstract
A method is described for measuring root and rhizome growth along temperature gradients in the field and under controlled conditions. Wedgeshaped Plexiglas sod boxes equipped with thermocouples are inserted into tundra soils over permafrost. After thaw has started, root and rhizome increases in length can be measured at intervals through the growing season by marking the positions of their tips on the sloping Plexiglas sides of the box. A similar box is used in a temperature-controlled coolant bath system in a controlled environment chamber. This latter system can simulate field temperature gradients down to and into permafrost. The simulated permafrost level can be raised or lowered by changing the temperature of the circulating ethylene glycol bath.
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