Using crown ratio in yellow-poplar compatible taper and volume equations.

摘要

Linear and non-linear crown ratio (CR) functions were incorporated into a segmented taper and cubic foot volume function developed for yellow-poplar [Liriodendron tulipifera] in West Virginia, USA. The inclusion of a CR variable provided significantly different parameter estimates but only modest improvement in the prediction of upper stern size and volume. Sample trees from the west central region of West Virginia exhibited a larger improvement. The main differences were concentrated in the stem section above 60% of total height.