Line intersect sampling: An efficient method for sampling of coarse woody debris? [German]

摘要

This article presents a method of line intersect sampling for volume estimation of coarse woody debris. Line sampling procedures can be used for deadwood stocktaking due to their greater suitability in dealing with linear objects than sampling methods using area-based inventory plots. The theory of the fine. intersect, sampling method is illustrated using a logging residue assessment in North America. A method is developed which includes angle adjustment for every piece of deadwood intersected. The method prevents log orientation bias. Computer tests of bias and precision are also presented. The. simulations were performed with FORTRAN programs. Based on the results of the simulations a suggestion for establishment of fine intersect sampling is developed and examined in a practical test and supplemented by empirical values. The inventory, sampling procedure produced unbiased results for randomly, partly and completely oriented deadwood distributions, without demanding a certain pattern for the arrangement of the intersect fines. A minimum number of hits is required to obtain good sampling results. The number of hits required was determined, among other factors, by the angle at which the pieces were cut in oriented deadwood distributions.