EVIDENCE FOR LONG-TERM PRODUCTIVITY CHANGE AS PROVIDED BY FIELD TRIALS

In the past two decades, considerable emphasis has been placed on developing computer models that can be used to predict effects of management practices on long-term forest productivity [1, 2, 3, 4], Although the value of such models as exploratory research tools is widely recognized, acceptance of their predicted changes in forest growth is limited. All models incorporate current understanding of forest growth, and produce results that are only as reliable as this understanding. Because our understanding of factors affecting forest growth is incomplete, results from carefully controlled field trials, rather than models, provide the more convincing evidence of productivity change.

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