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Controls of Bedrock Geochemistry on Soil and Plant Nutrients in Southeastern Utah The cold deserts of the Colorado Plateau contain numerous geologically and geochemically distinct sedimentary bedrock types. In the area near Canyonlands National Park in Southeastern Utah, geochemical variation in geologic substrates is related to the depositional environment with higher concentrations of Fe, Al, P, K, and Mg in sediments deposited in alluvial or marine environments and lower concentrations in bedrock derived from eolian sand dunes. Availability of soil nutrients to vegetation is also controlled by the formation of secondary minerals, particularly for P and Ca availability, which, in some geologic settings, appears closely related to variation of CaCO3 and Ca-phosphates in soils. However, the results... Categories: Publication; Types: Citation, Journal Citation; Tags: Ecosystems, bedrock, desert, foliar, nutrient, All tags... soil, stoichiometry, Fewer tags Contemporary geochemical composition and flux of aeolian dust to the San Juan Mountains, Colorado, United States Dust deposition in the Rocky Mountains may be an important biogeochemical flux from upwind ecosystems. Seasonal (winter/spring) dust mass fluxes to the San Juan Mountains during the period from 2004 to 2008 ranged from 5 to 10 g m?2, with individual deposition events reaching as high as 2 g m?2. Dust deposited in the San Juan Mountains was primarily composed of silt- and clay-sized particles, indicating a regional source area. The concentrations of most major and minor elements in this dust were similar to or less than average upper continental crustal concentrations, whereas trace element concentrations were often enriched. In particular, dust collected from the San Juan Mountain snowpack was characterized by enrichments... Categories: Publication; Types: Citation, Journal Citation; Tags: American Geophysical Union, Journal of Geophysical Research, dust, ecosystems, nutrients, All tags... soils., trace metals, Fewer tags Composition, Dynamics, and Fate of Leached Dissolved Organic Matter in Terrestrial Ecosystems: Results from a Decomposition Experiment Fluxes of dissolved organic matter (DOM) are an important vector for the movement of carbon (C) and nutrients both within and between ecosystems. However, although DOM fluxes from throughfall and through litterfall can be large, little is known about the fate of DOM leached from plant canopies, or from the litter layer into the soil horizon. In this study, our objectives were to determine the importance of plant-litter leachate as a vehicle for DOM movement, and to track DOM decomposition [including dissolve organic carbon (DOC) and dissolved organic nitrogen (DON) fractions], as well as DOM chemical and isotopic dynamics, during a long-term laboratory incubation experiment using fresh leaves and litter from several... Categories: Publication; Types: Citation, Journal Citation; Tags: Ecosystems, Springer New York, carbon-isotope ratio, decomposition, dissolved organic carbon (DOC), All tags... dissolved organic matter (DOM), humic substances, isotopic fractionation, leaf litter, Fewer tags