Excerpt from Estimating Ponderosa Pine Fuel Moisture Using National Fire-Danger Rating Moisture Values The stand consisted basically of two distinct matu rity groups (fig. Open groups were dominated by large, old growth ponderosa pine with a sparse pine seedling understory. These groups averaged about 600 trees per acre with 206 square feet of basal area per acre. Surface fuels were exposed to many hours of direct sunlight and direct rainfall. Closed groups were characterized by dense, overstocked clumps of ponder osa pine saplings, often referred to as dog-hair thickets. The average density was trees per acre with a basal area of 186 square feet per acre. With the thick canopy cover, fuels were exposed to little sunlight, and rainfall was dispersed through the canopy. Because of the obvious group differences, sam pling was stratified by maturity group. 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.

Relations between certain slash and forest floor moisture contents and the applicable estimated time lag fuel moistures of the National Fire Danger Rating System were investigated for 1-year-old jack pine fuel types in northeastern Minnesota and central Lower Michigan. Only approximate estimates of actual fuel moisture are possible fore the relations determined, thus emphasizing the need for on-site measurements when fuel moisture may be critical.