Evaluating the use of strontium isotopes in tree rings to record the isotopic signal of dust deposited on the Wasatch Mountains |
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| Institution: | 1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Tianhe District, Guangzhou 510650, China;2. Center of Plant Ecology, Core Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Tianhe District, Guangzhou 510650, China;3. University of Chinese Academy of Sciences, 19(A) Yuquan Road, Shijingshan District, Beijing 100049, China;4. Institute of Loess Plateau, Shanxi University, Key Laboratory of Ecological Restoration of Loess Plateau, Taiyuan, Shanxi Province 030006, China;5. Département de Sciences Fondamentales, Université du Québec à Chicoutimi, 555 Boulevard de l''Université, Chicoutimi, G7H 2B1, QC, Canada;6. Institut de recherche sur les forêts, Université du Québec en Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, QC J9 × 5E4, Canada;7. Laboratory for integral studies of forest dynamics of Eurasia, Siberian Federal University, Krasnoyarsk, 660036, Russian Federation;8. International Centre for Bamboo and Rattan No. 8 Futong Dongdajie, Wangjing Area, Chaoyang District, Beijing 100102, China;9. School of Life Sciences, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou, China;1. Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;3. University of Chinese Academy of Sciences, Beijing 10049, China;4. Institute of Geography, University of Erlangen-Nürnberg, Wetterkreuz 15, 91058 Erlangen, Germany;5. Tourism and Environment College of Shaanxi Normal University, Xi''an 710119, China;6. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100101, China |
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| Abstract: | Dust cycling from the Great Basin to the Rocky Mountains is an important component of ecological and hydrological processes. We investigated the use of strontium (Sr) concentrations and isotope ratios (87Sr/86Sr) in tree rings as a proxy for dust deposition. We report Sr concentrations and isotope ratios (87Sr/86Sr) from atmospherically deposited dust, soil, bedrock, and tree rings from the Wasatch Mountains to investigate provenance of dust landing on the Wasatch Mountains and to determine if a dust Sr record is preserved in tree rings. Trees obtained a majority of their Sr from dust, making them a useful record of dust source and deposition. Dust contributions of Sr to soils were more than 94% over quartzite, 63% over granodiorite, and 50% over limestone. Dust contributions of Sr to trees were more than 85% in trees growing over quartzite, 55% over granodiorite, and between 0% and 92% over limestone. These findings demonstrate that a dust signal was preserved in some tree rings and reflects how Sr from dust and bedrock mixes within the soil. Trees growing over quartzite were most sensitive to dust. Changes in Sr isotope ratios for a tree growing over quartzite were interpreted as changes in dust source over time. This work has laid the foundation for using tree rings as a proxy for dust deposition over time. |
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