[19980327]95-548ENR_森林健康：概述.pdf

For a further discussion of this relationship, see CRS Report 95-511 ENR, Forest Fires and1Forest Health.Data on timber mortality, timber inventory, and timberland area are from: Douglas S. Powell,2Joanne L. Faulkner, David R. Darr, Zhiliang Zhu, and Douglas MacCleery. Forest Resources ofthe United States, 1992. Gen. Tech. Rept. RM-234. Ft. Collins, CO: U.S.D.A. Forest Service,Sept. 1993. 132 p. (Hereafter referred to as Forest Resources, 1992.)Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS Web95-548 ENRUpdated March 27, 1998Forest Health: OverviewRoss W. GorteSpecialist in Natural Resources PolicyEnvironment and Natural Resources Policy DivisionSummaryThe pine ecosystems in the intermountain West are considered by many to beunhealthy. While the data are inconclusive, studies show at least localized problems oftimber mortality and dense stands of small trees, including a shift away from the fire- anddrought-resistant pines in mixed conifer stands. The comprehensive land managementplanning processes of the Forest Service and the Bureau of Land Management wereintended, in part, to address such issues, but to date, efforts by the