Filters: Tags: Desert ecology (X)
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Two native desert shrubs were evaluated for their growth potential and water and nitrogen uptake patterns over a nitrate-contaminated aquifer at a former uranium ore-processing facility in northeastern Arizona. Sarcobatus vermiculatus and Atriplex canescens are obligate and facultative phreatophytes, respectively, that dominate the local desert plant community. The main questions we addressed were: (1) Are these shrubs able to use water or nitrogen from the alluvial aquifer? (2) If so, does grazing interfere with that ability of shrubs? (3) What would be the ideal strategy to take up N from the plume and prevent its expansion and recharge using shrubs? ?18O and ?D isotope signatures from water in plant stem samples...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Atriplex canescens,
Desert ecology,
Journal of Arid Environments,
Nitrate,
Phytoremediation,
Seasonal changes in the hydrogen isotope ratios of xylem waters were measured to determine water sources used for growth in desert plants of southern Utah. While all species used winter-spring recharge precipitation for spring growth, utilization of summer rains was life-form dependent. Annuals and succulent perennials exhibited a complete dependence on summer precipitation. Herbaceous and woody perennial species simultaneously utilized both summer precipitation and remaining winter-spring precipitation, with herbaceous species much more reliant on the summer precipitation component. Several of the woody perennials exhibited no response to summer precipitation. Currently, precipitation in southern Utah is evenly...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Climate change,
Desert ecology,
Hydrogen isotope ratio,
Oecologia,
Water source
Carbon isotope discrimination (?) was measured for leaves of Atriplex confertifolia along a salinity gradient in northern Utah. Over this gradient, the variation of ? values was high for a C4 species, and the ? values were positively correlated with salinity in both years of study. Of the possible explanations for this patter, the ? results are consistent with the notion that salinity induces an increase in the bundle sheath leakiness of these C4 plants. Published in Western North American Naturalist, volume 55, issue 2, on pages 135 - 41, in 1995.
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Atriplex confertifolia,
Western North American Naturalist,
bundle sheath leakiness,
carbon isotope ratio,
desert ecology,
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