Rangeland Ecology & Management
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Displaying 101 - 150 of 329 results
- Library Collection RecordThe objectives of this study were to identify a Site Conservation Threshold, the point at which accelerated erosion occurs, and to examine the usefulness of the Water Erosion Prediction Project (WEPP…Publication Date 1996-05-01
- water erosion
- rill erosion
- ground cover
- semiarid grasslands
- highlands
- mathematical models
- loam soils
- clay soils
- range condition
- rain
- biomass
- sediment yield
- range management
- plant litter
- Arizona
- Library Collection RecordLehmann lovegrass (Eragrostis lehmanniana Nees), an introduced warm season grass, has invaded grasslands in southern Arizona, in many areas replacing the native warm-season grasses. A water balance…Publication Date 1994-09-01
- water binding capacity
- water content
- water balance
- evapotranspiration
- rain
- biomass
- Eragrostis lehmanniana
- introduced species
- Arizona
- soil water
- Library Collection RecordFew perennial legumes have been successfully introduced into western North American rangelands receiving less than 250 mm annual precipitation. Winter annual legumes in the genus Medicago (medics)…Publication Date 1993-01-01
- Medicago littoralis
- hard seeds
- medicago laciniata
- winter annuals
- Medicago polymorpha
- Medicago truncatula
- annuals
- seed banks
- arid zones
- persistence
- genotype
- drought tolerance
- stand establishment
- sowing rates
- precipitation
- semiarid zones
- rangelands
- Arizona
- Library Collection RecordOver the past century woody plants have increased in abundance on sites formerly occupied by grasslands in the Sonoran Desert. Woody plant invasion has been associated with a multitude of biological…Publication Date 1993-01-01
- desert rodents
- shrub invasion
- edaphic factors
- Acacia
- woody weeds
- sowing depth
- deserts
- weed biology
- Prosopis velutina
- seed dispersal
- grasslands
- seedling emergence
- invasion
- fires
- fire effects
- air temperature
- woody plants
- environmental factors
- sheep
- cattle
- seed germination
- establishment
- Arizona
- soil texture
- Library Collection RecordFire on rangelands used as a management tool or as an unwanted wildfire removes vegetation cover. Vegetation cover is thought to be a dominate factor controlling surface runoff and erosion.…Publication Date 1992-09-01
- ground cover
- soil erosion
- spatial variation
- ground vegetation
- loam soils
- fires
- fire effects
- runoff
- prescribed burning
- sandy loam soils
- natural grasslands
- range management
- seasonal variation
- rangelands
- Arizona
- Library Collection RecordIn 1974 we selected 8 pairs of gully headcuts on the Santa Rita Experimental Range. Mesquite (Prosopis velutina Woot.) on the watershed of 1 headcut of each pair was killed with diesel oil. Densities…Publication Date 1993-03-01
- Prosopis velutina
- semiarid grasslands
- watersheds
- soil erosion
- brush control
- vegetation management
- rain
- runoff
- plant density
- losses from soil
- rangelands
- grasses
- Arizona
- Library Collection RecordWe studied use of pastures and habitats in relation to moderate cattle grazing for 19 radio-collared desert mule deer (Odocoileus hemionus crooki) in a southeastern Arizona grass-shrubland. For each…Publication Date 1991-09-01
- odocoileus hemionus crooki
- xeroriparian habitats
- home range
- semi-desert scrub
- habitat selection
- habitats
- pastures
- Odocoileus hemionus
- cattle
- grazing
- Arizona
- Library Collection RecordEven though the Wilderness Act of 1964 provided for continuation of livestock grazing after wilderness designation, there has been continued debate about the Forest Service's implementation of…Publication Date 1991-09-01
- land policy
- permits
- animal unit month
- coronado national forest
- Tonto National Forest
- USDA
- wilderness
- national forests
- multiple land use
- grazing intensity
- range management
- rangelands
- grazing
- Arizona
- Library Collection RecordSuccessful germination and establishment of grass seedlings from surface-sown seeds requires a microsite which provides adequate soil water and temperature conditions, among other species-specific…Publication Date 1991-05-01
- Bouteloua curtipendula
- hybrids
- broadcasting
- soil morphological features
- Eragrostis
- Panicum antidotale
- seedbeds
- Eragrostis trichophora
- surface roughness
- safesites
- microenvironments
- sown grasslands
- seedling emergence
- soil water content
- land restoration
- Eragrostis lehmanniana
- Arizona
- Library Collection RecordLaboratory tests are often conducted to determine seed germination responses to temperatures for seedbed ecology interpretations and revegetation seeding rate calculations. To determine the utility…Publication Date 1992-05-01
- Eragrostis trichophora
- Eragrostis intermedia
- hybrids
- Eragrostis
- seedbeds
- soil temperature
- diurnal variation
- seedling emergence
- stand establishment
- soil water content
- land restoration
- seed germination
- Eragrostis lehmanniana
- Arizona
- Library Collection RecordPerennial plants collected from 5 north-central Arizona semiarid locations were assayed for tebuthiuron [N-5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl-N,N'-dimethylurea] and its metabolites…Publication Date 1991-05-01
- long term experiments
- herbicide residues
- metabolites
- Bouteloua eriopoda
- Bouteloua curtipendula
- tebuthiuron
- Poaceae
- Bouteloua gracilis
- shrubs
- semiarid zones
- application rates
- rangelands
- Arizona
- forage
- Library Collection RecordPonderosa pine (Pinus ponderosa Laws.) overstory-forage understory relationships were studied on the Kaibab Plateau of northern Arizona to evaluate how well forage (graminoid, forb, and current year…Publication Date 1992-05-01
- stand density
- stand structure
- understory
- mathematical models
- prediction
- indexes
- Pinus ponderosa
- regression analysis
- crop production
- canopy
- Arizona
- forage
- Library Collection RecordThe dry-weight rank technique has been used to measure vegetation in various habitats but has not been evaluated in desert shrub habitats. We sampled browse, forb, and grass in the palo-verde (…Publication Date 1991-07-01
- Sonoran Desert
- ranking
- xerophytes
- mountains
- deserts
- semi-desert scrub
- browse
- measurements
- plant ecology
- sampling
- slopes
- grasses
- Arizona
- forage
- dry matter
- Library Collection RecordRange condition is usually defined by similarity of current to climax or potential vegetation. It is often assumed that rangelands in low condition are biologically less productive than those in…Publication Date 1991-01-01
- seral stages
- site factors
- productivity
- pastures
- biomass production
- plant communities
- botanical composition
- rangelands
- Arizona
- forage
- Library Collection RecordCreosotebush (Larrea tridentata [Sesse & Moc. ex DC.] Cov) and other shrubs have spread into semidesert grasslands of the southwestern United States and northern Mexico; and as creosotebush…Publication Date 1990-01-01
- Condalia
- Zinnia
- parthenium incanum
- land imprinting
- railing
- acacia constricta
- cassia wisleizeni
- condalia ericoides
- zinnia pumila
- Acacia
- plowing
- Larrea tridentata
- manual weed control
- Flourensia
- Flourensia cernua
- pesticide application
- Prosopis velutina
- Prosopis glandulosa
- tebuthiuron
- brush control
- Cassia
- Mexico
- range management
- Arizona
- Library Collection RecordCattle trampling has been recommended to bury seeds and encourage seedling establishment but has not been compared with traditional seedbed preparation techniques. We compared seedling emergence of…Publication Date 1991-03-01
- land imprinting
- plowing
- buried seeds
- seedbed preparation
- Bouteloua curtipendula
- hybrids
- Eragrostis
- Panicum antidotale
- Eragrostis trichophora
- seedling emergence
- seeds
- land restoration
- cattle
- Eragrostis lehmanniana
- trampling
- Arizona
- Library Collection RecordLocation of seeds in the seedbed may affect germination and seedling establishment of range grasses. Our objective was to determine the effects of trampling by livestock and mechanical seedbed…Publication Date 1991-03-01
- Eragrostis trichophora
- land imprinting
- plowing
- buried seeds
- seedbed preparation
- Bouteloua curtipendula
- hybrids
- Eragrostis
- Panicum antidotale
- seedling emergence
- rain
- seeds
- environmental factors
- cattle
- Eragrostis lehmanniana
- trampling
- Arizona
- Library Collection RecordUtilizing source data for annual herbage production which had been obtained through repeated measurements, though not necessarily taken in each year, in 2 Arizona ponderosa pine (Pinus ponderosa)…Publication Date 1990-01-01
- forest ecology
- watersheds
- understory
- Pinus ponderosa
- regression analysis
- growth rate
- plant communities
- canopy
- Arizona
- forage
- Library Collection RecordThe measured runoff from a contour-ripped rangeland watershed is compared with hypothetical runoff based on KINEROS model simulations assuming that the watershed had not been treated. The results…Publication Date 1990-11-01
- ripping
- kinematics
- kineros model
- simulation models
- hydrology
- arid zones
- watersheds
- mathematical models
- runoff
- range management
- rangelands
- Arizona
- Library Collection RecordThe key to managing Arizona chaparral depends on creating and maintaining brush-free or savanna-like habitats. Brush control using fire, chemicals, and mechanical methods has been tested previously;…Publication Date 1991-03-01
- chaparral
- chaparral soils
- Quercus turbinella
- manual weed control
- soil density
- biological control
- controlled grazing
- brush control
- soil fertility
- stocking rate
- vegetation
- regrowth
- grazing intensity
- goats
- range management
- browsing
- grazing
- Arizona
- Library Collection RecordLehmann lovegrass (Eragrostis lehmanniana Nees), a perennial bunchgrass from southern Africa, has recently replaced native grasses on 200,000 ha in southeastern Arizona. Hence the need to determine…Publication Date 1990-07-01
- range management
- biomass accumulation
- phenology
- climatic factors
- plant litter
- seasonal variation
- crop yield
- Eragrostis lehmanniana
- introduced species
- water relations
- live biomass
- dead biomass
- grazing
- Arizona
- Library Collection RecordJunipers (Juniperus spp.) and pinyons (pinus edulis Engelm.) are reinfesting areas from which they have been removed and are encroaching into other areas. Controlling these trees while they are small…Publication Date 1990-05-01
- pesticide application
- Pinus edulis
- soil classification
- tebuthiuron
- brush control
- picloram
- range management
- Juniperus
- New Mexico
- Arizona
- Library Collection RecordLittle has been done to evaluate the mid-winter crude protein, phosphorus, and in vitro digestibility of subspecies and accessions of rubber rabbitbrush (Chrysothamnus nauseosus ssp.) For those few…Publication Date 1990-03-01
- geographical races
- variation
- Chrysothamnus nauseosus
- winter
- phosphorus
- crude protein
- California
- in vitro digestibility
- Nevada
- nutritive value
- Utah
- Arizona
- forage
- Library Collection RecordChanges in herbaceous plant density and canopy cover of creosotebush (Larrea tridentata Sesse & Moc. ex DC) and associated shrubs following brush control treatments were measured in Sonoran and…Publication Date 1991-03-01
- land imprinting
- railing
- Chihuahuan Desert
- Sonoran Desert
- Larrea tridentata
- xerophytes
- tillage
- manual weed control
- discing
- deserts
- tebuthiuron
- brush control
- Mexico
- forbs
- shrubs
- plant density
- botanical composition
- canopy
- grasses
- Arizona
- Library Collection RecordLehmann lovegrass (Eragostis lehmanniana Nees) may be viewed as either an undesirable exotic invader or an important ground cover and forage plant on southwestern rangelands, depending on management…Publication Date 1988-09-01
- ground cover plants
- Weeds
- seedling emergence
- ecological succession
- mortality
- fires
- fire effects
- prescribed burning
- land restoration
- seed germination
- range management
- Eragrostis lehmanniana
- rangelands
- Arizona
- forage
- Library Collection RecordJojoba (Simmondsia chinensis) is a major evergreen browse species for livestock and wildlife throughout its range from central Arizona to northwest Mexico and Baja California. Current guidelines for…Publication Date 1989-01-01
- Simmondsia chinensis
- wildlife
- browse plants
- woody plants
- range management
- browsing
- livestock
- grazing
- Arizona
- Library Collection RecordGrazing was eliminated from the Appleton-Whittell Research Ranch Sanctuary, located in south-central Arizona, in 1968. Long-term changes in canopy cover of vegetation were evaluated between 1969 and…Publication Date 1989-07-01
- recovery
- ecosystems
- pastures
- grazing intensity
- plant communities
- semiarid zones
- botanical composition
- grazing
- Arizona
- Library Collection RecordQuantitative effects of temperature on germination were determined for 17 cool-season grasses, 19 warm-season grasses, and 18 miscellaneous forbs and shrubs associated with semiarid rangelands. These…Publication Date 1989-01-01
- regression analysis
- inhibition
- germination
- woody plants
- semiarid zones
- seed germination
- temperature
- rangelands
- grasses
- Arizona
- Library Collection RecordThe need for forage plants that are productive in, and adapted to, semiarid conditions prompted us to examine the range and independence of assortment of nutritional qualities of wild stands of…Publication Date 1988-03-01
- Salsola
- water soluble compounds
- acid detergent fiber
- Southwestern United States
- physicochemical properties
- nitrates
- oxalates
- lignin
- crude protein
- California
- semiarid zones
- in vitro digestibility
- Texas
- Nevada
- nutritive value
- New Mexico
- Arizona
- forage
- dry matter
- Library Collection RecordFour communities or sites dominated by blackbrush (Coleogyne ramosissima Torr.) were studied in the Kaiparowits Basin of southern Utah and northern Arizona. One site has been heavily grazed yearlong…Publication Date 1987-09-01
- Coleogyne ramosissima
- ground cover
- vegetation types
- plant communities
- Utah
- livestock
- grazing
- Arizona
- Library Collection RecordLane et al. (1987) found that the proportion of bare or covered ground surface under the canopy is important for modeling infiltration in rangeland soils. Using a total of 322 composite plant canopy…Publication Date 1988-07-01
- resources
- mathematics and statistics
- rocks
- ground cover plants
- rangeland soils
- Atriplex confertifolia
- surveys
- water intake
- remote sensing
- prediction
- Artemisia tridentata
- Nevada
- canopy
- infiltration
- Arizona
- Library Collection RecordLand managers have recommended burning or mowing big sacaton (Sporobolus wrightii) grassland in either fall or winter for 100 years. The greatest potential for natural fire would have occurred when…Publication Date 1988-01-01
- mowing
- seasons
- Sporobolus
- crop quality
- grasslands
- prescribed burning
- range management
- Arizona
- forage
- Library Collection RecordChanges in vegetation under yearlong grazing were compared with those under the Santa Rita grazing system, a rotation system designed for southwestern US rangelands where 90% of the forage is…Publication Date 1988-07-01
- yield response functions
- grasslands
- vegetation
- rotational grazing
- semiarid zones
- plant density
- range management
- grazing
- Arizona
- Library Collection RecordVegetation allometric relations were examined for 4 important grass species in southwestern ponderosa pine (Pinus ponderosa). Logarithmic regressions were developed relating aboveground biomass to…Publication Date 1986-09-01
- Festuca arizonica
- Muhlenbergia montana
- Poa fendleriana
- Coconino National Forest
- sitanion longefolium
- ground cover plants
- basal area
- biomass determination
- allometry
- Pinus ponderosa
- prescribed burning
- rangelands
- Arizona
- Library Collection RecordStudies have shown a negative relationship between stocking rate and animal performance in conventional grazing systems. However, short-duration grazing (SDG) proponents state that stocking rates can…Publication Date 1986-05-01
- Parkinsonia
- cercidium floridum
- annual fluctuations
- carbon
- Prosopis juliflora
- deserts
- biogeochemical cycles
- plant analysis
- nitrogen
- biomass
- plant litter
- seasonal variation
- rangelands
- Arizona
- chemical constituents of plants
- Library Collection RecordElk (Cervus elaphus) and mule deer (Odocoileus hemionus) distribution and use of habitats shared with cattle (Bos spp.) on a ponderosa pine (Pinus ponderosa)-bunchgrass range in central Arizona was…Publication Date 1987-01-01
- habitat selection
- Pinus ponderosa
- Cervus elaphus
- Odocoileus hemionus
- grazing behavior
- cattle
- range management
- rangelands
- geographical distribution
- Arizona
- Library Collection RecordPerennial grasses were seeded by drilling or broadcasting on 4 mechanical and 3 herbicidal weed control and/or seedbed preparation treatments at 4 semidesert grassland sites invaded by creosotebush (…Publication Date 1986-11-01
- Larrea tridentata
- crop establishment
- seedbed preparation
- deserts
- broadcasting
- Eragrostis
- pesticide application
- grasslands
- Mexico
- drilling
- perennials
- weed control
- Poaceae
- Arizona
- Library Collection RecordMost rainfall and almost all runoff from Southwestern rangelands are the result of intense summer thunderstorm rainfall. Gully growth and headcutting are evident throughout the region. A large,…Publication Date 1986-11-01
- gully erosion
- rainfall-runoff relationships
- sediments
- watersheds
- semiarid zones
- rangelands
- Arizona
- Library Collection RecordSeedlings of velvet mesquite (Prosopis glandulosa var. velutina) were grown in sandy loam, clay loam, and clay soils to 30 and 60 days of age. Top and root growth parameters were measured at those…Publication Date 1986-07-01
- prosopis glandulosa var. velutina
- desert soils
- clay loam soils
- deserts
- Prosopis glandulosa
- clay soils
- root systems
- seedlings
- growth
- sandy loam soils
- Arizona
- Library Collection RecordA series of 14-day field experiments were conducted to evaluate seedling establishment characteristics of Bouteloua, Erogrostis, and Panicum grass species with controlled wet-dry watering…Publication Date 1987-01-01
- dryland farming
- Bouteloua curtipendula
- Eragrostis
- Panicum antidotale
- seedling emergence
- drought tolerance
- mortality
- dry seasons
- wet season
- seed germination
- establishment
- seasonal variation
- Arizona
- Library Collection RecordLive and standing dead biomass, standing crop, and total nitrogen, within each component, were measured in a big sacaton (Sporobolus wrightii Monro) grassland in southeastern Arizona for 3 years to…Publication Date 1985-05-01
- Sporobolus wrightii
- Sporobolus
- soil
- biomass determination
- grasslands
- vegetation
- nitrogen content
- Texas
- grazing
- New Mexico
- Arizona
- Library Collection RecordVarious rates of tebuthiuron pellets were aerially applied on rangelands in the Southwest to determine effects on noxious shrubs. Creosotebush (Larrea tridentata) and tarbush (Flourensia cernua)…Publication Date 1985-09-01
- arid zones
- tebuthiuron
- brush control
- woody plants
- rangelands
- New Mexico
- Arizona
- poisonous plants
- Library Collection RecordThe reduction in extent of riparian forests in the southwestern United States has been a topic of recent concern. The effect of dams on downstream river flow and the consequent modification of the…Publication Date 1985-03-01
- water conservation
- Populus fremontii
- Populus
- riparian forests
- vegetation
- Arizona
- Library Collection RecordEffects of various treatments on germination rates were determined for Lehmann lovegrass (Eragrostis lehmanniana Nees), 'Cochise' lovegrass (Eragrostis lehmanniana Nees × Eragrostis…Publication Date 1985-09-01
- Eragrostis
- Panicum antidotale
- seed treatments
- Atriplex canescens
- soil water content
- semiarid zones
- seed germination
- establishment
- rangelands
- Arizona
- Library Collection RecordGreen needlegrass (Stipa viridula Trin.) is commonly used in range seedings and revegetation of disturbed lands in the northern Great Plains. This study was conducted to determine the influence of…Publication Date 1985-05-01
- Great Plains
- planting methods
- Soil Conservation Service
- plant materials center, bismarck, north dakota
- anatomy and morphology
- rooting
- Nassella viridula
- Canada
- seedlings
- New Mexico
- Arizona
- Library Collection RecordBiomass components of mesquite (Prosopis juliflora (Swartz) DC) and palo verde (Cercidium floridum (Benth)) soil-plant systems were collected during spring, winter, and fall for 3 years to study the…Publication Date 1986-03-01
- Parkinsonia
- cercidium floridum
- annual fluctuations
- carbon
- Prosopis juliflora
- deserts
- biogeochemical cycles
- plant analysis
- nitrogen
- biomass
- plant litter
- seasonal variation
- rangelands
- Arizona
- chemical constituents of plants
- Library Collection RecordApplications of pelleted picloram to individual plants of alligator juniper, one-seed juniper, Utah juniper, gambel oak, and shrub live oak in north central Arizona showed that a high rate…Publication Date 1984-07-01
- Quercus gambelii
- Juniperus monosperma
- Juniperus osteosperma
- Quercus turbinella
- herbicides
- Arizona
- Library Collection RecordFire temperatures at 4 vertical locations within 3 desert microhabitats were measured during a controlled burn using both temperature pellets and thermocouples. Examples of maximum air temperatures (…Publication Date 1984-05-01
- deserts
- Arizona
- Library Collection RecordSeventy-two Navajo ranchers were questioned about the role of mixed-breed dogs with their flocks. Navajos call their dogs "sheep dogs" but, unlike sheep dogs used by other ranchers to…Publication Date 1985-01-01
- coyotes
- predation
- ranching
- guard dogs
- sheep
- goats
- Arizona
- Library Collection RecordLivestock have been excluded from a 3,160-ha range in southeastern Arizona since 1968. Compared to an adjacent continuously grazed area, in 1981-82 a protected upland site supported 45% more grass…Publication Date 1984-05-01
- Arizona