• Vegetation and Flora of the Gran Desierto, Sonora, Mexico

      Felger, Richard S.; Arizona-Sonora Desert Museum; Environmental Research Laboratory, University of Arizona (University of Arizona (Tucson, AZ), 1980)
      The Gran Desierto of northwestern Sonora is one of the most arid regions of North America. The flora and vegetation of the Sierra del Rosario and the surrounding extensive dune system are analyzed and compared with each other. The dunes, covering on the order of 4,500 sq. km., support a flora of 75 species, while the Sierra, comprising approximately 78 sq. km., supports 105 species. The total flora consists of 145 species, with 36 species common to both the dunes and Sierra. The life -form spectra are indicative of extremely arid conditions: ephemeral species make up 55% of the total flora. A number of range extensions are reported. Mentzelia longiloba is reduced to a subspecies of M. multiflora. There are only three non-native, naturalized species among the dune flora, and none in the Sierra flora. There is no indication of endemism among the Sierra flora. In contrast, the dunes, when considered together with similar habitat in adjacent southeastern California and southwestern Arizona, show some level of evolutionary differentiation for approximately 15% of the flora.
    • Vegetation of Grassy Remnants in the Las Vegas Valley, Southern Nevada

      Craig, Jill E.; Abella, Scott R.; Public Lands Institute, University of Nevada Las Vegas (University of Arizona (Tucson, AZ), 2008-06)
      The approximately 1000-km² Las Vegas Valley contains a rich assemblage of unique plant communities in the eastern Mojave Desert. Yet, there is little published documentation of this vegetation as its destruction continues with proceeding urban development. Development has intensified after the 1998 Southern Nevada Public Land Management Act mandated the disposal of federal lands. We document plant communities at four unique grassy remnants, some of which have since been destroyed, in the southwestern Las Vegas Valley. Sample plots of 0.25 or 0.09 ha at each site contained washes (supporting catclaw [Acacia greggii] at three sites) and associated uplands. Native perennial grasses comprised 12% of plant species richness/100 m2 and 5% of total relative cover on average. A total of 8 native perennial grasses were detected at the four sites, with predominant species including fluff grass (Dasyochloa pulchella), purple three-awn (Aristida purpurea), big galleta (Pleuraphis rigida), red grama (Bouteloua trifida), and slim tridens (Tridens muticus). These communities appeared as grass-shrublands, rather than the widespread shrublands commonly described for the Mojave Desert. Of large shrubs at the three sites containing catclaw, catclaw density ranged from 52-124/ha, Mojave yucca (Yucca schidigera) from 8-32/ha, and creosote bush (Larrea tridentata) from 168-456/ha. We also obtained permission to salvage native plants from one site prior to land development. Overall survival of salvaged plants of eight species exceeded 76% after one year of greenhouse/outdoor storage. We suggest that while many opportunities have already been lost, collecting and documenting information on the rich vegetation of the Las Vegas Valley and salvaging native plants or seed for use in desert landscaping, parks and habitat improvement in protected areas would leave a future legacy of this ecologically unique region.
    • Vegetation of the Gila River Resource Area, Eastern Arizona

      Minckley, W. L.; Clark, Thomas O.; Department of Zoology, Arizona State University; Center for Environmental Studies, Arizona State University (University of Arizona (Tucson, AZ), 1982-01)
    • Vegetative Key for Identification of the Woody Legumes of the Sonoran Desert Region

      Turner, Raymond M.; Busman, Caryl L.; U.S. Geological Survey; University of Arizona (University of Arizona (Tucson, AZ), 1985)
    • Vegetative Propagation of Key Southwestern Woody Riparian Species

      Pope, Dennis P.; Brock, John H.; Backhaus, Ralph A.; USDA Soil Conservation Service; Arizona State University (University of Arizona (Tucson, AZ), 1990)
      A series of laboratory and greenhouse experiments were designed with the objective of determining effective methods of vegetatively propagating selected woody riparian species for use in restoration of Southwestern riparian habitats. Cuttings from four major southwest riparian species including Fremont Cottonwood (Populus fremontii), Goodding Willow (Salix gooddingii), Arizona Sycamore (Platanus wrightii), and Arizona Walnut (juglans major) were collected along the Gila River in western New Mexico. Propagation studies with hardwood and root cuttings were performed. Results from these studies determined that Fremont Cottonwood and Goodding Willow could be readily propagated from dormant stem cuttings. Nodal explants from the laboratory -grown Arizona walnut seedlings were tissue -cultured in order to develop a method to mass produce this difficult to propagate species. A nutrient and hormone solution was formulated that resulted in shoot proliferation of Arizona walnut explants in vitro.
    • Warm Temperate Grasslands

      Brown, David E.; Makings, Elizabeth; Arizona State University (University of Arizona (Tucson, AZ), 2014-01)
    • Water Conservation Strategies for the Urban Arid Landscape

      Rodiek, Jon; Texas Tech University (University of Arizona (Tucson, AZ), 1984)
    • Water Harvesting: An Alternative Irrigation Method for Desert Gardners

      Pratt, Richard C.; Department of Horticulture, Purdue University (University of Arizona (Tucson, AZ), 1980)
    • Water Relations and Carbon Dioxide Uptake of Agave deserti - Special Adaptations to Desert Climates

      Nobel, Park S.; Department of Biology, University of California at Los Angeles; Laboratory of Biomedical and Environmental Sciences, University of California at Los Angeles (University of Arizona (Tucson, AZ), 1985)
      Agave deserti Engelm., a common agave of the Sonoran Desert, possesses Crassulacean acid metabolism. Thus, the main period for stomatal opening and net CO, uptake is at night, which leads to a high water -use efficiency. Seedling establishment occurs only when enough water -storage capacity can be generated following germination so that the young seedling can withstand the first drought. Agave deserti is only moderately tolerant of low tissue temperatures but extremely tolerant of high tissue temperatures, an important desert adaptation. Its rosette growth habit leads to a relatively uniform distribution of photosynthetically active radiation over the leaves, which contributes to its high productivity for a desert plant.
    • Water Requirements of Arid-adapted Groundcover and Sub-shrub Species for Landscape Use in Arizona

      Feldman, William R.; Carter, Steven A.; Stone, Kim W.; Boyce Thompson Southwestern Arboretum (University of Arizona (Tucson, AZ), 1997-06)
    • Water-wise Landscaping

      Pauker, Ran; Ben Gurion, University of the Negev, Institutes for Applied Research (University of Arizona (Tucson, AZ), 2015-05-20)
    • Wetland Trees of Arizona for Possible Oasis Use in Arid Regions

      Rodiek, Jon; School of Renewable Resources, University of Arizona (University of Arizona (Tucson, AZ), 1981)
    • What is a Desert?

      McGinnies, William G.; Office of Arid Lands Studies, University of Arizona (University of Arizona (Tucson, AZ), 1985)
    • What is in a Name - Legumes of Arizona - An Illustrated Flora and Reference

      Siegwarth, Mark; Lake, Kiresten; Boyce Thompson Arboretum; Desert Legume Program, The University of Arizona (University of Arizona (Tucson, AZ), 2009-06)
    • Wheat Establishment for Mulch on Coal Mine Soil in a Semiarid Environment

      Day, A. D.; Tucker, T. C.; Thames, J. L.; Department of Plant Sciences, University of Arizona; Department of Soils, Water, and Engineering, University of Arizona; School of Renewable Natural Resources, University of Arizona (University of Arizona (Tucson, AZ), 1980)
      Experiments were conducted on the Black Mesa Coal Mine near Kayenta, Arizona over a 2-year period (1977 and 1978) to study the germination (emergence), seedling establishment, and ground cover from wheat (Triticum aestivum L.) in undisturbed soil and coal mine soil (spoils). Growth of wheat was evaluated for two fertilizer treatments applied at the rates of 0 kg/ha and 560 kg/ha of ammonium phosphate and two soil moisture treatments (optimum and insufficient). The coal mine soil was leveled to conform to the surrounding rolling topography. In April of each year wheat was broadcast planted due to the rough terrain, fertilized at planting time, and irrigated as needed (using wheat plants as indicators of moisture stress). Seeds germinated per unit area, seedlings established per unit area, and percent ground cover were recorded. These three parameters were higher in undisturbed soil than in coal mine soil, when fertilized than when not fertilized, and when optimum soil moisture was provided than when seeds were stressed for moisture. At the end of the growing season, the wheat straw was incorporated into the soil surface and was used as a mulching material. In coal mine wastes in a semiarid environment, the area must be fertilized and provided with optimum soil moisture to produce the maximum growth of wheat for immediate ground cover and soil mulch.
    • The Wild Beans of Southwestern North America

      Buhrow, R.; Department of Plant Sciences, University of Arizona (University of Arizona (Tucson, AZ), 1983)
    • Wild Cochineal of Prickly Pear (Opuntia sp.) as a Dye Source in Arizona

      Crosswhite, C. D. (University of Arizona (Tucson, AZ), 1984)
    • Wildfire in Southeastern Arizona Between 1859 and 1890

      Bahre, Conrad J.; University of California (University of Arizona (Tucson, AZ), 1985)
      Local newspaper accounts of wildfires in southeastern Arizona between 1859 and 1890 demonstrate that during that period, 1) wildfires were much larger in areal extent, especially in the grasslands, than they are at present; 2) the occurrence of large grassland fires declined after 1882, probably as a result of overgrazing; 3) the cessation of major grassland fires preceded the "brush invasion" of the 1890s; 4) Amerinds, especially the Apaches, set wildfires; 5) wildfire suppression was favored by the early Anglo settlers; 6) wildfires occurred in all of the major vegetation communities, including desert scrub; and 7) wildfires were fairly frequent.
    • Windthrow and Other Problems Associated with Eucalyptus

      Crosswhite, Frank S.; Boyce Thompson Southwestern Arboretum (University of Arizona (Tucson, AZ), 1985)
    • Woody Legumes in Southwest Desert

      Johnson, Matthew B.; Desert Legume Program, College of Agriculture, The University of Arizona (University of Arizona (Tucson, AZ), 1993)