Permanent sample plots provide the basis for growth modelling, yield prediction and sustained yield management, and the reliability of the data is crucial to these and many other aspects of forest management. To obtain reliable data, it is necessary to ensure consistent standards and that a wide range of stand and site conditions are sampled using both passive monitoring and experimental plots. Individual trees should be numbered, marked and mapped. Remeasurement frequency should be determined to facilitate plot relocation and ensure that growth is greater than measurement errors. Measurement records should be unambiguous and secure.
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