Volcanic ash additions control soil carbon accumulation in brown forest soils in Japan(Soil Genesis, Classification and Survey)

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The objective of the present study was to clarify the influence of volcanic ash addition on soil carbon stocks and the carbon accumulation process in brown forest soils (BFS) in Japan. The degree of volcanic ash addition to the soil was estimated according to the acid ammonium oxalate extractable aluminum (Al_<ox>) and lithic fragment contents, and their vertical distribution patterns. The BFS was classified in order of increasing volcanic ash influence on the soil into the following types: high Al_<ox> content with no gravel (H-Al_<ox>-NGv), high Al_<ox> with a high gravel content (H-Al_<ox>-Gv), moderate Al_<ox> (M-Al_<ox>), and low Al_<ox> (L-Al_<ox>), and then analyzed for carbon content, carbon amount, carbon stock, Al_<ox> amount and pyrophosphate extractable aluminum (Al_<py>) amount. The correlation between the carbon and Al_<py> amounts and the relationship between the Al_<py> and Al_<ox> amounts in the BFS samples indicated that the amount of carbon is determined by Al-humus complex formation, which is defined by the active Al generated from additional volcanic ash in BFS soil samples of BFS. Therefore, soils with thicker horizons and greater amounts of Al_<ox> had higher carbon levels in deeper horizons. For this reason, soil carbon stocks at depths of 0-30cm and 0-100cm, and in the effective soil depth of BFS, were larger and followed the order H-Al_<ox>-NGv=H-Al_<ox>-Gv>M-Al_<ox>>L-Al_<ox>. Furthermore, successive accumulations of volcanic ash on the soil surface promoted soil carbon accumulation as a result of the development of the surface horizon in H-Al_<ox>-NGv BFS. Our results suggest that volcanic ash additions control the soil carbon accumulation of forest soil in Japan.

Volcanic ash additions control soil carbon accumulation in brown forest soils in Japan(Soil Genesis, Classification and Survey)

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