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It is important to understand the changes in the Cs concentration in litter through leaching when considering that Cs is transferred from basal food resources to animals in forested streams. We found that the difference of Cs activity concentration in litter between forest and stream was associated with both litter type and Cs fallout volume around Fukushima, Japan. The Cs activity concentrations in the litter of evergreen conifers tended to be greater than those in the litter of broad-leaved deciduous trees because of the absence of deciduous leaves during the fallout period in March 2011. Moreover, Cs activity concentrations in forest litter were greater with respect to the Cs fallout volume. The Cs activity concentrations in stream litter were much lower than those in forest litter when those in forest litter were higher. The Cs leaching patterns indicated that the differences in Cs activity concentration between forest and stream litter could change with changes in both fallout volume and litter type. Because litter is an important basal food resource in the food webs of both forests and streams, the Cs concentration gradient reflects to possible Cs transfer from lower to higher trophic animals. Our findings will improve our understanding of the spatial heterogeneity and variability of Cs concentrations in animals resident to the contaminated landscape.
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| http://dx.doi.org/10.1016/j.jenvrad.2016.07.030 | DOI Listing |
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