Magnesium Isotope Variations to Trace Liming Input to Terrestrial Ecosystems: A Case Study in the Vosges Mountains

Journal of Environmental Quality
B Emile Bolou-BiArnaud Legout

Abstract

Liming with Ca and Mg carbonates is commonly used to reduce soil and stream acidity and to improve vegetation growth and nutrition in forests. Ten years ago, dolomite lime was experimentally applied to a forest catchment on granite in the Vosges Mountains (northeast France), which is characterized by acid soils and drained by an acid stream. The average Mg isotope composition of the dolomite lime (-1.75‰) was low compared with that of tree foliage (-0.70‰), granite and deep soil layers (-0.40‰), and stream water (-0.80‰) in the control catchment. After liming, the exchangeable Mg concentrations in surface soil layers, which were initially very low, increased, and the Mg isotope composition decreased (up to -0.60‰). The decrease was smaller in deeper layers but not in proportion to the increase in exchangeable Mg content, suggesting contributions from mineralization of organic matter and/or displacement of exchangeable Mg from surface layers. Before application, Mg concentration in beech and fir leaves was low, and that of 1-yr-old fir needles was lower than that in current needles. Internal Mg translocation within fir needles also resulted in a lower δMg of older needles. Three years after dolomite application, the Mg isotope c...Continue Reading

References

Jan 15, 2004·Environmental Pollution·Jussi Vuorenmaa
Nov 19, 2009·Proceedings of the National Academy of Sciences of the United States of America·Bing ShenDouglas M Morton
Sep 14, 2011·Rapid Communications in Mass Spectrometry : RCM·Ming-Xing LingWeidong Sun

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Citations

Oct 26, 2016·Environmental Microbiology Reports·Zaenab A FahadShahid Mahmood

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