A5036924966- Rangeland and Wildlife Management
- Ecology and Vegetation Dynamics Studies
- Botany, Ecology, and Taxonomy Studies
- Fire effects on ecosystems
- Botany and Plant Ecology Studies
- Turfgrass Adaptation and Management
- Archaeology and Natural History
- Plant Water Relations and Carbon Dynamics
- Seed Germination and Physiology
- Tree-ring climate responses
- Forest ecology and management
- Species Distribution and Climate Change
- Botanical Research and Chemistry
- Forest Management and Policy
- Rangeland Management and Livestock Ecology
- Geology and Paleoclimatology Research
- Landslides and related hazards
- Plant Parasitism and Resistance
- Seedling growth and survival studies
- Climate variability and models
- Ecology and biodiversity studies
- Allelopathy and phytotoxic interactions
- Flowering Plant Growth and Cultivation
- Plant and animal studies
- Plant Taxonomy and Phylogenetics
Rocky Mountain Research Station
2013-2023
Rocky Mountain Research (United States)
2000-2022
United States Department of Agriculture
2008-2022
Agricultural Research Service
2022
US Forest Service
1991-2021
Utah State University
1998
Intermountain Healthcare
1991-1998
University of Utah
1994
The perception is that today’s large fires are an ecological catastrophe because they burn vast areas with high intensities and severities. However, little known of the impacts on both historical contemporary landscapes. present paper presents a review current knowledge effects in United States by important ecosystems written regional experts. (1) ponderosa pine–Douglas-fir, (2) sagebrush–grasslands, (3) piñon–juniper, (4) chaparral, (5) mixed-conifer, (6) spruce–fir. This found were common...
Abstract Fire regimes in North American forests are diverse and modern fire records often too short to capture important patterns, trends, feedbacks, drivers of variability. Tree‐ring scars provide valuable perspectives on regimes, including centuries‐long year, season, frequency, severity, size. Here, we introduce the newly compiled tree‐ring fire‐scar network (NAFSN), which contains 2562 sites, >37,000 fire‐scarred trees, covers large parts America. We investigate NAFSN terms geography,...
In arid and semi-arid landscapes around the world, wildfire plays a key role in maintaining species diversity. Dominant plant associations may depend upon particular fire regime characteristics for their persistence. Mountain shrub communities high-elevation of Intermountain West, USA, are strongly influenced by post-fire recovery dynamics obligate-seeding shrub, mountain big sagebrush (Artemisia tridentata Nutt. ssp. vaseyana [Rydb.] Beetle). This is short-distance disperser with...
Grasslands across the United States play a key role in regional livelihood and national food security. Yet, it is still unclear how this important resource will respond to prolonged warm droughts more intense rainfall events predicted with climate change. The early 21st-century drought southwestern resulted hydroclimatic conditions that are similar those expected future We investigated impact of on aboveground net primary production (ANPP) six desert plains grasslands dominated by C4 (warm...
Precipitation regimes are predicted to shift more extreme patterns that characterized by heavy rainfall events and longer dry intervals, yet their ecological impacts on vegetation production remain uncertain across biomes in natural climatic conditions. This situ study investigated the effects of these conditions aboveground net primary (ANPP) combining a greenness index from satellite measurements records during 2000–2009 11 long‐term experimental sites multiple climates. Results showed...
Regulation of seed germination timing is an important component population persistence, especially for short‐lived plants in seasonal environments with unpredictable year‐to‐year weather variation. Seed patterns were examined the laboratory seeds from 135 populations belonging to 38 species and 13 sections genus Penstemon (Scrophulariaceae), habitats ranging warm desert alpine tundra. Seeds most dormant at dispersal required a period moist chilling become germinable. Response was related...
We inferred climate effects on fire occurrence from 1630 to 1900 for a new set of crossdated fire-scar chronologies 18 forested sites in Utah and one site eastern Nevada. Years with regionally synchronous fires (31 years at ≥20% sites) occurred during drier than average summers no any (100 years) were wetter average. Antecedent wet associated regional-fire mixed-conifer ponderosa pine forest types, possibly by affecting fine fuel amount continuity. NINO3 (an index the El Niño–Southern...
Linum perenne L. is a nonclonal perennial herb widely distributed across range of habitats. Variation in seed germination patterns was examined for 21 Intermountain collections and the commercial cultivar ‘Appar’. Collections from sites with long, snowy winters were largely dormant at harvest responded positively to chilling. middle elevation sagebrush‐grassland generally nondormant contained fraction induced into secondary dormancy by palouse prairie pinyon‐juniper unaffected chilling, as...
Interacting threats to ecosystem function, including climate change, wildfire, and invasive species necessitate native plant restoration in desert ecosystems. However, efforts often remain unguided by ecological genetic information. Given that many ecosystems are flux from plans need account for both contemporary future climates when choosing seed sources. In this study we analyze vegetative responses, mortality, growth, carbon isotope ratios two blackbrush (Coleogyne ramosissima) common...
Regulation of seed germination timing is an important component population persistence, especially for short-lived plants in seasonal environments with unpredictable year-to-year weather variation. Seed patterns were examined the laboratory seeds from 135 populations belonging to 38 species and 13 sections genus Penstemon (Scrophulariaceae), habitats ranging warm desert alpine tundra. Seeds most dormant at dispersal required a period moist chilling become germinable. Response was related...
Development of plant materials adapted to the demands a harsh environment and conditions created by standard planting practices has resulted in improved seedling establishment for some species.Bluebunch wheatgrass (Pseudoroegneria spicata [Pursh] Love) is an important native bunchgrass often planted Intermountain Pacific Northwest regions.Though cultivars have been developed, this species continues reputation weak seedlings.Forty-seven accessions bluebunch collected from naturally occurring...
Penstemon palmeri is a short-lived perennial herb that occupies early-successional habitats at mid altitude in the semi-arid south-western United States. Laboratory germination experiments with seeds from nine populations showed most were non-dormant autumn temperatures (15°C), but majority required light for germination. Moist chilling winter (1°C) 4 weeks induced secondary dormancy about half seedsn whilst moist incubation superoptimal summer (30°C) 2 removed primary and chilling-induced...
Blackbrush ( Coleogyne ramosissima : Rosaceae) is a slow‐growing, non‐clonal shrub that regionally dominant on xeric, shallow soils in the North American Mojave Desert‐Great Basin transition zone and southern Colorado Plateau. seed production concentrated mast years, most seeds are cached later consumed by heteromyid rodents. Vegetation histories show blackbrush stands can persist apparently unchanged for over century. We used dendrochronological techniques to examine plant age...
Abstract Propagation of the genus Penstemon for use in landscape horticulture has been handicapped by a lack understanding seed dormancy and practical method breaking numerous species. The extent seeds 27 wild populations representing 16 Intermountain species was investigated subjecting to stratification (moist prechilling) 2 weeks at 2°C (36°F) varying concentrations gibberellic acid (GA3). Germination varied from 0 88% non-treated 13 100% treated with 250 ppm GA3. Collections 10 required...
An experimental design required burn treatments for 10-m2 circular plots.We constructed a fire enclosure the plots using sheetmetal, electrical conduit, and other commonly available materials.We field tested in sagebrush-grass ecosystems central Nevada Utah, evaluated peak temperatures small metal tags striped with temperature sensitive paint.We obtained average surface tem- peratures of 310, 307, 381° C bare ground, under grass, shrub microsites, respectively, sites 253, 299, 337° same...