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This paper presents the expectations and variances of the estimators of basal area and basal area growth using the remeasured horizontal line sampling. The estimators are classified by fixed diameter factor method and variable diameter factor method, and the former is further subdivided into direct and indirect methods. Variances were compared on one actual forest and two hypothetical forests simulated by computer. The basal area results reveal that (1) the estimator based on the fixed diameter factor method has smaller variance than that of the variable diameter factor method for the first measurement, (2) the estimator based on the direct method has smaller variance than that of the variable diameter factor method for the first measurement, (3) the estimator based on the direct method has smaller variance than that of the indirect method for the subsequent remeasurement. The basal area growth results reveal that (1) the estimator based on variable diameter factor method has smaller variance than that of the direct method, (2) the indirect method has a smaller variance when the basal area growth is less than the original basal area. For. Sci. 33(1):174-184.
Research Assistant, Department of Forestry, National Taiwan University, Taipei, Taiwan, ROC
Publication date: March 1, 1987
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Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.