Stemflow-induced spatial heterogeneity of radiocesium concentrations and stocks in the soil of a broadleaved deciduous forest

The Science of the Total Environment
Naohiro ImamuraKazuki Nanko

Abstract

The transport of radiocesium from the canopy and quantification of the spatial distribution of radiocesium in the soil of konara oak forests are important to better understand the variability of137Cs stocks in the soil between proximal and distal stem areas as well as fine-scale variations around the tree trunk. Moreover, a better understanding of fine-scale spatial variabilities of137Cs concentrations and stocks will provide insights for optimizing soil sampling strategies to provide a more robust estimation of contamination at the stand scale. This study aims to elucidate the transport of137Cs by stemflow in a radioactively contaminated konara oak forest in Tsukuba, Japan by describing and quantifying the fine-scale spatial distribution of137Cs in the soil and preferential flowpaths of stemflow on the tree stem by a dye tracing experiment.137Cs concentrations and stocks were higher in the soils of the proximal stem area than distal stem area when they corresponded with the preferential flowpaths of stemflow. There was a significant relationship between canopy projection area of individual trees and average soil137Cs concentrations and stocks, even though canopies of the trees overlapped. Our results demonstrate that the spati...Continue Reading

References

Feb 23, 2012·Fukushima Journal of Medical Science·Katsuhiko Yamaguchi, UNKNOWN Radiation Survey Team of Fukushima University

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