CH4 emissions from litter-covered sandbars and the edge of a mountain stream in a secondary deciduous broadleaf forest

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Because methanogens have a relatively short retention time in flowing water, mountain streams are generally considered unsuitable for their growth. However, litter-covered stream edges and sandbars of mountain streams are potential CH4 emission areas because methanogens can persist at such sites. In the present study, we focused on these possible CH4 sources. To evaluate spatial variations in CH4 emissions from sites near a mountain stream, we installed 46 chambers on the stream bed and its edge. We observed high CH4 emission rates from the sandbars in the stream and from the stream edge when they were covered with leaf litter. In contrast, from chambers located upslope away from the stream or below the water level in the stream, we observed almost no CH4 emissions. To evaluate the effect of litter covering the soil, we experimentally put 20 g or 40 g (dry weight) of leaves, woody tissue, or acorns from Quercus serrata Murray into closed chambers and observed the CH4 flux weekly between 2 April and 22 October 2009. We observed the highest CH4 emission rates in chambers with 40 g of leaf litter; in these chambers, the oxidation-reduction potential (ORP) was negatively correlated with the CH4 emission rate. These results suggest that CH4 can be emitted from sandbars and edges of mountain streams, with larger emissions occurring when surfaces are covered with leaf litter and when ORP is low and the soil temperature high. To evaluate the overall role of the forest in CH4 circulation, further studies of CH4 emissions from mountain stream sites covered with leaf litter are needed.

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  • 農業気象

    農業気象 67 (1), 43-51, 2011

    日本農業気象学会

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