Treesearch

From a series of shade tolerance screening trials conducted in an outdoor Shade Tolerance Screening Laboratory, 22 forages (16 grasses and 6 legumes) were selected for quality evaluation. The forages were grown under non-shade (100% of full sun, the control), moderate shade (45%), and dense shade (20%) with adequate water and nutrients and free of competition from other plants. All 22 forages had equal or higher percent crude protein (%CP) and CP yield (g pot-1) under moderate shade than in the control. Under dense shade, 22 and 18 forages had equal or higher %CP and CP yield than in the...

In the semi-arid environment of the Blue Mountains, Oregon (USA), water is a critical resource for both ecosystems and human uses and will be affected by climate change in both the near- and long-term. Warmer temperatures will reduce snowpack and snow-dominated watersheds will transition to mixed rain and snow, while mixed rain and snow dominated watersheds will shift towards rain dominated. This will result in high flows occurring more commonly in late autumn and winter rather than spring, and lower low flows in summer, phenomena that may already be occurring in the Pacific Northwest....

Tapertip hawksbeard occurs in all states west of Montana, Wyoming, Colorado, and New Mexico (Bogler 2006). It is common in and east of the Cascade and Sierra mountain ranges and found in the northern parts of Arizona and New Mexico (Cronquist et al. 1994; LBJWC 2018). Populations are most common in the Columbia Plateau and Great Basin provinces (Babcock and Stebbins 1938) and exist in most, if not all, counties in Utah (Welsh et al. 1987). In general, tapertip hawksbeard occurs in regions with continental climates that experience dryness in all seasons (Babcock and Stebbins 1938).

Munro’s globemallow is a western species occurring in southern British Columbia, east of the Cascades in Washington and Oregon, as far south as Nevada and Utah and as far east as southwestern Wyoming (Welsh et al. 1987; Holmgren et al. 2005; La Duke 2016; LBJWC 2018). Munro’s globemallow is more common in northern Utah and the Wasatch Plateau, whereas gooseberryleaf globemallow is more common in the southern part of the state (Pendery and Rumbaugh 1986).

Aspen fleabane is widely distributed throughout western North America. In Canada, it occurs in British Columbia and Alberta. In the United States it occurs in western South Dakota and all states to its west, except California. However, there is a population in Baja California that is disjunct from the nearest southernmost populations in Arizona (Nesom 2006). Aspen fleabane is particularly common in the Great Basin and Intermountain regions (Hermann 1966).

Small-leaf globemallow occurs in the Central Basin and Range and Colorado Plateau ecoregions (Lambert 2005). It occurs naturally in Nevada, the southern two-thirds of Utah, western Colorado, northwestern New Mexico, northern and central Arizona, and adjacent California (Kearney 1935; Holmgren et al. 2005; La Duke 2016; USDA NRCS 2017). It has been grown in southern Idaho (Pendery and Rumbaugh 1990) but is not native there. On the high plateaus of central and northern Arizona, small-leaf globemallow is the most abundant globemallow species (Kearney 1935). Although the distributions of...

Douglas’ dustymaiden is native to North America and is widely distributed throughout the West, occurring from southern Alberta, British Columbia, and Saskatchewan to California, Nevada, northern Arizona, northern New Mexico, Colorado, and the Dakotas (Cronquist 1994; Morefield 2006; LBJWC 2017). Variety douglasii is more widespread, occurring throughout the range reported for the species. Variety alpina occurs only in Montana, Idaho, Oregon, California, Utah, Colorado, and Wyoming (Morefield 2006).PDF UPDATED: FEBRUARY 2024.

This report provides the findings from recreation monitoring of the Salmon Wild and Scenic River’s recreation segment during summer of 2020. This baseline study is intended to provide a greater understanding of river use on this segment and, in combination with visitor use social science, inform user capacity and management actions in the future.

Recent bark beetle outbreaks in western North American subalpine forests have prompted managers to salvage log some beetle-affected stands. We examined the short-term (i.e., two to three years post-treatment) consequences of such salvage logging on vascular understory plant (i.e., graminoid, forb, and shrub) communities. At 24 lodgepole pine (Pinus contorta) sites in Colorado, USA, that had been attacked by mountain pine beetles (Dendroctonus ponderosae), we evaluated how logging operations impacted understory plant species richness, cover, and composition by comparing paired unlogged and...

To investigate the long-term impacts of biomass harvesting on site productivity, we remeasured trees in the 1974 Forest Residues Utilization Research and Development Program at Coram Experimental Forest in western Montana. Three levels (high, medium, and low) of biomass removal intensity combined with broadcast burning treatment were assigned after clearcut in western larch (Larix occidentalis Nutt.) stands in 1974. From 1976 to 79, twenty five 2 + 0 bare root seedlings of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) were consecutively planted in rows. In 2013, tree height, dbh...