Taking the Pulse of Trees
How do you take the pulse of a tree? High-precision dendrometer bands like the ones pictured here can measure daily fluctuations in water balance of a tree bole, in addition to its seasonal growth. The summer drought experienced by trees at the Andrews Forest is one of many stressors that has been increasing over time with climate change. While the tree species that have thrived in this landscape for millennia are adapted to wet winters and dry summers, prolonged drought combined with heat waves can stress even the drought-tolerant Douglas fir trees and lead to early shut down of stem gr
