Excerpt from Estimation of Phloem Thickness in Lodgepole Pine The mountain pine beetle shows a strong preference for large-diameter trees in lodgepole pine stands (hopping and Beall 1948, Cole and Amman Recent evidence indicates that brood survival of the beetles is related to thickness of phloem, the beetles being generally unable to produce a successful brood in trees with phloem thick ness of less than about inch (roe and Amman Therefore, understanding of tree diameter and phloem thickness distributions in lodgepole pine stands of various descriptions would be valuable. Considerable information in the form of stand table data is available for assessing diameter distributions in lodgepole pine stands, but there is virtually none that will allow estimation of phloem thickness in stands of varying descriptions. A method of modeling phloem thickness distributions for lodgepole pine stands under various management assumptions would be valuable because it could lead to the develop ment of a risk classification for assessing stand vulnerability to the beetle. A start ing point is the development of equations for estimating phloem thickness of individual lodgepole pine trees. This paper presents such equations and discusses the functional relationships underlying them. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.