Abstract
Windbreaks and shelterbelts have long been known to provide valuable amelioration of the environment to reduce wind erosion; improve crop yields; reduce heating costs in buildings; protect livestock; control snow drifting; provide wildlife habitat; improve the aesthetics of rural landscapes; etc. The efficiency of a windbreak will be affected by many of its design parameters such as length, height, width, orientation and porosity. Different wind-control objectives will require different designs, particularly with respect to porosity. The specific implications for the use of poplars and willows in windbreaks are discussed in terms of these objectives and design characteristics.

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