Treesearch

Nitrogen deposition is increasing worldwide from anthropogenic sources and encroactring upon previously N limited ecosystems. Recent literature reports increases in inorganic N deposition in Pacific Northwest forests of the United States due to expanding urbanization. We examined the contributions of atmospheric deposition of inorganic N to old-growth and second-growth Douglas-fir (Pseudotsuga menziesii) forests in the Cascade Mountains of southern Washington State. We used ion exchange resin lysimeters (IERs) to measure throughfall and compared it to data from a nearby atmospheric...

The genus Hydnoplicata and its type species, H. whitei, were described by Gilkey in 1954. Having discovered that it has amyloid asci and other characters that relate it to the genus Peziza, Trappe later proposed the new combination, Peziza whiten, even though the species is consistently hypogeous. Recent molecular phylogenetic studies of Peziza, however, indicate that Peziza sensu lato is strongly non-monophyletic. Hydnoplicata is in a Glade distinctly separate from the type Glade of Peziza, so the name Hydnoplicata can be restored to represent that Glade. Because H. whitei proved to be a...

Molecular phylogenetic analyses for the gomphoid-phalloid fungi were conducted based on the five gene dataset with extensive taxon sampling. The monophyly of the gomphoid-phalloid clade was strongly supported, and four well supported major subclades were recognized. Three of the four subclades were represented entirely by gastroid taxa, and only Gomphales contained both gastroid and nongastroid taxa. While the gastroid morphology is derived from epigeous, nongastroid taxa in Gomphales, the topology of Phallales indicated that truffle-like form is an ancestral morphology of the stinkhorn...

We describe methods and results for broad-scale estimation and mapping of forest biomass for the Canadian province of Alberta. Differences over successive decades provided an estimate of biomass change. Over 1500 permanent sample plots (PSP) were analyzed from across the range of lodgepole pine (Pinus contorta var. latifolia Engelm.), the major forest tree species of Alberta. The PSP network is densest in stands aged between 70 and 100 years and is well-represented by stands of al1 ages to 150 years of age. Stand biomass (Mg ha-1) was estimated for each PSP plot as the sum of the respective...

Using a landscape simulation model, we examined ecological and economic implications of forest policies designed to emulate the historical fire regime across the 2 x 106 ha Oregon Coast Range. Simulated policies included two variants of the current policy and three policies reflecting aspects of the historical fire regime. Policy development was guided by the management intentions of four owner groups: forest industry, nonindustrial private, state, and federal. Fire severity was emulated with green-tree retention standards; fire frequency was emulated with annual harvestable area restrictio...

The tree line of the continental Australian Alps yielded eighteen species of hypogeous fungi, all probably . forming ectomycorrhizae with Eucalyptus niphophila, the tree species characteristic of that habitat. Six of the species were undescribed. These collections represented six families and twelve genera: Boletaceae (with Chamonixia), Gallaceaceae (Gallacea), Hysterangiaceae (Hysterangium) , Cortinariaceae (Cortinarius, Dermocybe, Descomyces, Protoglossum, Setchelliogaster), Russulaceae (Cystangium, Gymnomyces, Zelleromyces) and Tricholomataceae (Hydnangium). A key to hypogeous fungi so far

Projections of Alaska timber products output, the derived demand for logs and chips, and timber harvest by owner are developed by using a trend-based analysis. These are revised projections of those made in 1990, 1994, and 1997, and reflect the consequences of recent changes in the Alaska forest sector and trends in markets for Alaska products. With the cancellation of the long-term contracts and the closure of the two southeast Alaska pulp mills, demand for Alaska national forest timber now depends on markets for sawn wood and the ability to export manufacturing residues and lower grade...

San Luis Obispo County contains oak woodlands at varying levels of risk of sudden oak death (SOD), caused by a fungal pathogen (Phytophthora ramorum) that in the past decade has killed thousands of oak (Quercus spp.) and tanoak (Lithocarpus densiflorus) trees in California. SOD was most recently detected 16 km north of the San Luis Obispo County line. Low-risk woodlands occupy 57 percent of the county's land area, whereas high-risk woodlands occupy only 1 percent. During 2002-2004, we collected data on vegetative structure and small vertebrate (birds, small mammals, amphibians, reptiles)...

The development of remote sensing technologies increases the potential to support more precise, efficient, and ecologically-sensitive approaches to forest resource management. One of the primary requirements of precision forest management is accurate and detailed 3D spatial data relating to the type and condition of forest stands and characteristics of the underlying terrain surface. A new generation of high-resolution, active remote sensing technologies, including airborne laser scanning (LIDAR) and interferometric synthetic aperture RADAR (IFSAR) have the capability to provide direct, 3D...

Over 40 outbreaks of Phytophthora ramorum have occurred in managed gardens in the United Kingdom. Three of these sites, one in the southeast of England and two in the southwest, have been closely monitored since October 2003. These sites represented differing disease scenarios at the start of monitoring, as eradication action had already taken place at the site in the southeast, whereas no action had taken place in the southwest. The progress of existing infections and the development of new infections were monitored at all sites. A number of current or previously infected areas within the...