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Assessing Tree Health

Kevin W. Zobrist

出版	Washington State University Extension, 2011
URL	http://books.google.com.hk/books?id=s2HDswEACAAJ&hl=&source=gbs_api

註釋

When considering tree health, it is important to remember that tree health and forest health are not the same thing. Tree health refers to the health of an individual tree, whereas forest health refers to the health of an entire forest system, including trees, plants, soil, wildlife, and water. A certain amount of insect activity, disease, mortality, and decay is normal and healthy within a forest system, and damaged, deformed, dying, and dead trees provide critical habitat for wildlife.