Belanger（eの頭に´）,N., Holmden,C., Courchesne,C., Cote（oの頭に＾、eの頭に´）,B. and Hendershot,W.H.(2012): Constraining soil mineral weathering 87Sr/86Sr for calcium apportionment studies of a deciduous forest growing on soils developed from granitoid igneous rocks. Geoderma, 185-186, 84-96.

『花崗岩質火成岩から発達した土壌上に成長している落葉林のカルシウム配分研究のための土壌鉱物風化の87Sr/86Sr制限』

『Abstract
　We used 87Sr/86Sr as a proxy for Ca to apportion the contribution of atmospheric deposition and soil mineral weathering sources to the Ca pools in trees in a small forested watershed of southern Quebec. The effects of topography and forest stand composition were assessed by dividing the watershed into three study zones representing two elevations and differences in tree species. Apportionment calculations show that all tree species studied contained Ca that is dominantly sourced from soil mineral weathering ( averaging 85%), due to the presence in the soils of easily weathered Ca^bearing minerals such as calcite and apatite as well as the relatively deep rooting habits (reaching the mineral soil) of the tree species. Calcium pools in trees are shifted towards the atmospheric component on hilltops due to the filtering of dry aerosols of the tree canopies which are more exposed to atmospheric circulation than trees at the bottom of the slopes, although some variability in soil bulk chemistry and mineralogy in the watershed obscures the full extent of this phenomenon. The buildup and recycling of Ca in the soil-vegetation system, with the forest floor acting as the major accessible Ca pool for the tree roots, must be considered when interpreting apportionment calculations. This work supports other Ca cycling models in forests suggesting that topography can influence the balance of Ca captured from atmospheric sources by trees, even in cases where mineral weathering is the dominant source of Ca nutrition in trees.

Keywords: Calcium cycling; Atmospheric deposition; Soil mineral weathering; 87Sr/86Sr; Ca/Sr; Ba/Sr』

1. Introduction
2. materials and methods
　2.1. Study site
　2.2. Field study
　2.3. Sequential chemical leaching
　2.4. Major and minor element analyses
　2.5. 87Sr/86Sr analyses
3. Results
　3.1. Atmospheric deposition 87Sr/86Sr and molar Ca/Sr
　3.2. Wood and foliage 87Sr/86Sr and molar Ca/Sr
　3.3. Soil and bedrock 87Sr/86Sr, molar Ca/Sr and molar Ba/Sr
　3.4. Stream water and soil solution 87Sr/86Sr, molar Ca/Sr and molar Ba/Sr
　3.5. Calcium apportionment calculations
4. Discussion
　4.1. Soil mineral weathering
　4.2. Significance of anorthosite weathering contributions to the stream
　4.3. Implications for Ca apportionment studies using 87Sr/86Sr as a tracer
Acknowledgement
References

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