Botkin and Kellar (2014) describe an ecosystem as “communities of organisms and their nonliving environment in which nutrients and other chemicals cycle and energy flow.” I have chosen the forests of Pennsylvania as a holistic ecosystem to examine. Pennsylvania has approximately 17 million acres of forest, making up 59% of this State. The predominant species associations are oak/hickory in the central and southern areas and Northern hardwood (including black cherry, maple and birch) in the north and north-west (Sustaining Penn’s Woods, 2001). The vast forest area contains mature ecosystems with the aforementioned tree species as the climax species. ...
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