AuthorAriffin, Radziah Bt.
KeywordsDesert flora as food.
Desert plants as food.
Desert plants -- Arizona.
Desert plants -- Mexico.
Desert plants -- California.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Degree ProgramGraduate College
Nutrition and Food Science
Degree GrantorUniversity of Arizona
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Transpiration and conductance responses of salt-desert vegetaion in the Owens Valley of California in relation to climate and soil moistureWarren, Daniel Cram. (The University of Arizona., 1991)Work presented in this dissertation was performed in the salt-desert environment of the Owens Valley of California. The area experiences low-rainfall, hot summers, but has a high water table, seldom more than 5 meters from the surface. To test differences in plant species wateruse, a steady-state porometer was used for transpiration measurements while a 2-meter point-frame was used to estimate leaf area index on each species studied. The five species studied (Atriplex torreyi, Chrysothamnus nauseosus, Distichlis stricta, Sporobolus airoides, and Sarcobatus vermiculatus) varied with regard to photosynthetic pathways and leaf morphology. Water-use differences among species are hypothesized to be related to the differing physiological and morphological characteristics observed in the different species studied. This work focuses upon methods for integrating porometric transpiration rates and point-frame measured leaf area to estimate daily plant water-use. Daily water-use values are correlated with environmental growth conditions. A computer program was developed for scenario testing so that conclusions could be drawn concerning how given plants respond to different conditions of soil moisture and atmospheric evaporative demand. The computer-aided calculations led to conclusions that low water-use behavior characterizes A. torreyi, and high water-use behavior characterizes C. nauseosus. C4 photosynthesis and low leaf conductance may contribute to the success of A. torreyi on fine-textured soils when water transfer rates to roots are limiting to transpiration. Fine-textured soils may inhibit production in C. nauseosus because the species requires higher rates of transpiration to achieve optimal growth than soil hydraulic conductivity allows. These conclusions have implications for land managers who should recognize that climax plant communities in saltdesert regions are better at conserving water and stabilizing soil than is colonizing vegetation. Management should seek to maintain climax vegetation cover because restoration is difficult once vegetation disturbance occurs.
Desert Plants, Volume 33, Number 2 (January 2018)Verrier, James T.; University of Arizona Herbarium (University of Arizona (Tucson, AZ), 2018-01)The Santa Catalina Mountains are located in Pima and Pinal counties in southeastern Arizona. The study area is defined as approximately 259,000 acres (104,813 hectares) or 405 mi2 (1,048 km2), spanning an elevational gradient of 6,457 ft (1,968 m). Located on the northwestern edge of the Madrean-influenced sky island complex of southeastern Arizona and northern Sonora, highly diverse plant communities range from Sonoran Desert to subalpine forest. A total of 380 days of field work were conducted between 2007–2017, including extensive exploration of the remote east side of the mountains. The vascular flora includes 1,360 taxa in 127 families and is currently the largest of any range in southern Arizona. Non-native plants are represented by 167 taxa and comprise 12.3% of the total flora. The three largest plant families are Asteraceae, Poaceae and Fabaceae, with 213, 187 and 107 taxa respectively. Euphor-bia, Muhlenbergia and Dalea are the largest genera with 24, 22 and 16 species. A total of 375 taxa are found on lime-stone or dolomitic substrates. There are 69 historically collected taxa that have not been seen or collected in 55 years, which are excluded from this checklist. New additions to the vascular flora are vouchered at the University of Arizona Herbarium. A checklist of 169 non-vascular plants from 36 families, based on over 1,150 collections from 18 national herbaria, is included. The floristic diversity of this sky island represents nearly a third of the entire state flora, while occupying less than half a percent of the state’s area. Geographic location, elevational gradient, geological diversity, and a high percentage of species found at the edge of their ranges contribute to the rich diversity of this unique mountain range.Monsoon storms cover the west side of the range.