Determination of soil exchangeable-cation loss and weathering rates using Sr isotopes
Article Abstract:
Total cation export from soil can result from mineral weathering reactions and from the removal exchangeable or plant-available cations in the soil. These components of cation export were determined by measuring Sr-87/Sr-86 ratios to trace cation sources in stream water. This technique was used to determine the cation dynamics in the high-elevation forest ecosystem in the Adirondack mountains, NY. The results showed that 50%-60% of the strontium in the exchangeable cations are atmospheric in origin. Furthermore, mineral weathering reactions contribute 70% and exchangeable reactions 30% of the annual strontium exports.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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A silicate weathering mechanism linking increases in marine 87Sr/86Sr with global glaciation
Article Abstract:
Examination of the isotopic composition of Sr in granitoid soils on alpine glacial moraines in the Wind River Range, Wyoming helps understand the influence of glaciation on silicate weathering. The ratio of 87Sr/86Sr in the Sr released during the early stages of weathering is higher than that during the later stages. During glacial-interglacial cycling, the weathering mechanism increases the global riverine 87Sr/86Sr by approximately 0.0002. This increase explains the influence of glaciation on the rate of change of marine 87Sr/86Sr ratio.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Natural isotope markers in salmon
Article Abstract:
Environmental signals could be used to identity fish rearing streams and so maximize restoration and conservation policies for fish stocks. Juvenile Atlantic salmon were identified from different rearing sites by studying the different ratios of stable strontium isotopes which occur naturally in the water. Isotope ratios can distinguish multiple populations more sensitively than elemental concentrations. Fish stocks can be identified according to their freshwater signature.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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