Treesearch

A paradigm shift from fire suppression to fire suppression and prescription requires a shift in emphasis from simply controlling wildfire occurrence and spread to one that includes controlling characteristics of prescribed fire. Suppression focuses on preventing unwanted effects that might result from wildfire occurrence. Prescription promotes desired effects by precisely and properly implementing fire occurrence. The duality of these concepts requires a new research focus. Research must now determine how to control processes that constitute a specific fire event. Each fire event includes...

Cumulative watershed effects are environmental changes that are affected by more than.one land-use activity and that are influenced by.processes involving the generation or transport.of water. Almost all environmental changes are.cumulative effects, and almost all land-use.activities contribute to cumulative effects

Effects of Armillaria spp., Phellinus weirii, Heterobasidion annosum, or bark beetles on stand dynamics are represented by the Western Root Disease Model,Version 3.0. This model, which operates in conjunction with the Forest Vegetation Simulator, can be used to evaluate the effects of many silvicultural practices. This guide contains instructions for use, detailed description of model functions, an overview of characteristics of root diseases, a comparison of model predictions to real data, and special instructions for users in British Columbia

Monterey pine (Pinus radiata) is a well known and much loved rare endemic of California and Raja California. Over the past two million years, its distribution has fluctuated regularly in response to climate change, Today, the species is contained in five small disjunct native populations: at Point Año Nuevo, the Monterey Peninsula, and Cambria in central California, and two Mexican islands, Gedros and Guadalupe. Monterey pine has been the focus of increasingly urgent conservation concern (Fremontia, 1997, vol. 25 no. 2), with the populations facing various onslaughts of human cause.

Truffles are a staple food source for many forest small mammals yet the vegetation or soil conditions associated with truffle abundance are unknown. We examined the spatial distribution of forest structures, organic layer depth, root density, and two of the most common western North American truffles (Elaphomyces granulatus and Rhizopogon parksii), in managed-young, natural-mature and old-growth western hemlock (Tsuga heterophylla)/Douglas-fir (Pseudotsuga menziesii) stands in Washington State. Forest conditions, E. granulatus and R. parksii sporocarp locations were mapped and analyzed...

The genetic codes of living organisms are natural resources no less than soil, air, and water. Genetic resources-from nucleotide sequences in DNA to selected genotypes, populations, and species-are the raw material in forestry: for breeders, for the forest manager who produces an economic crop, for society that reaps the environmental benefits provided by forests, and the continued evolution of the species itself.