Leaf Conductance during the Final Season of a Senescing Aspen Branch

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Abstract
Leaf conductance, transpiration, and environmental conditions were measured on two aspen (Populus tremuloides Michx.) branches in a natural stand, using an automatic cuvette system. Fortuitously, leaves on one branch senesced about 10 days early, allowing comparison between a senescing branch and a normal branch. Terminal bud development was retarded on the senescent branch, and a portion of the branch eventually abscised about 20 centimeters from the end. Roughly 1% to 2% of the other branches on the study tree and adjacent trees of that clone also senesced and were dead the following spring.