The Leaf in Winter
The annual shedding of leaves is an evolutionary tactic that conserves
moisture. Broad leaves (as opposed to
needles), with their large surface areas give off large amounts of moisture
through evaporation. In winter,
when the ground freezes and the tree cannot get water through its roots,
water conservation becomes
necessary for the tree's survival. Also, winter's dry, freezing air would
destroy broad leaf tissues.
The photo at left was taken at the 7,182-acre Cook Forest State Park,
which was once called the 'Black Forest.' The area is famous for
its stands of old growth forest. Cook Forest's 'Forest Cathedral' of towering
white pines and hemlocks is a National Natural Landmark. The Clarion River
meanders around the southern border of the park and is popular for canoeing
and rafting.