Evaluation of Pg absorption strength of humic acids as a paleoenvironmental indicator in buried paleosols on tephra beds, Japan

Global soil carbon (C) stocks account for approximately three times that found in the atmosphere. In the Aso mountain region of Southern Japan, seminatural grasslands have been maintained by annual harvests and/or burning for more than 1000 years. Quantification of soil C stocks and C sequestration rates in Aso mountain ecosystem is needed to make well‐informed, land‐use decisions to maximize C sinks while minimizing C emissions. Soil cores were collected from six sites within 200 km2 (767–937 m asl.) from the surface down to the k‐Ah layer established 7300 years ago by a volcanic eruption. The biological sources of the C stored in the Aso mountain ecosystem were investigated by combining C content at a number of sampling depths with age (using 14C dating) and δ13C isotopic fractionation. Quantification of plant phytoliths at several depths was used to make basic reconstructions of past vegetation and was linked with C‐sequestration rates. The mean total C stock of all six sites was 232 Mg C ha−1 (28–417 Mg C ha−1), which equates to a soil C sequestration rate of 32 kg C ha−1 yr−1 over 7300 years. Mean soil C sequestration rates over 34, 50 and 100 years were estimated by an equation regressing soil C sequestration rate against soil C accumulation interval, which was modeled to be 618, 483 and 332 kg C ha−1 yr−1, respectively. Such data allows for a deeper understanding in how much C could be sequestered in Miscanthus grasslands at different time scales. In Aso, tribe Andropogoneae (especially Miscanthus and Schizoachyrium genera) and tribe Paniceae contributed between 64% and 100% of soil C based on δ13C abundance. We conclude that the seminatural, C4‐dominated grassland system serves as an important C sink, and worthy of future conservation.

show abstract

“…Sasa ), and 0.3 ( Sasa sect. Crassinodi ) (Sugiyama, ; Sugiyama et al ., ; Inoue et al ., ; Watanabe et al ., ).…”

Section: Methodsmentioning

confidence: 97%

Soil carbon stocks and carbon sequestration rates in seminatural grassland in Aso region, Kumamoto, Southern Japan

Toma

Clifton‐Brown

Sugiyama

et al. 2013

Global Change Biology

View full text Add to dashboard Cite

show abstract

“…The sclerotium grains contain a remarkable amount of DHPQ (Kumada and Hurst, 1967;Sato, 1976b;Nakabayashi et al, 1982;Kumada, 1987), and DHPQ in the green fraction of humic acid (Pg) also originates from the C. geophilum sclerotium grains (Kumada and Hurst, 1967;Sato and Kumada, 1967;Sato, 1976b;Nakabayashi et al, 1982;Kumada, 1987). Moreover, both the sclerotium grains of C. geophilum (Trappe, 1969;Kumada, 1987;Massicotte et al, 1992;Watanabe et al, 2004Watanabe et al, , 2007Sakagami, 2010) and Pg (Kumada and Hurst, 1967;Sato, 1976a;Kumada, 1987;Watanabe et al, 1996) are found throughout the world. Thus, there is a strong possibility that DHPQ from C. geophilum is a major precursor of sedimentary perylene around the world.…”

Section: Introductionmentioning

confidence: 99%

Perylene in Lake Biwa sediments originating from Cenococcum geophilum in its catchment area

Itoh

Sakagami

Takasu

et al. 2012

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

“…Initial studies on the properties of Pg, the green fraction of humic acid, were introduced by Watanabe (1992) and Watanabe et al (1996) as a possible indicator of past climatic change. Aoki et al (1998) and Watanabe et al (1998) used analyses of organic carbon and ratios of elements reliable to be mobilized by weathering to identify buried soils and reconstruct local temperature and vegetation changes during the Holocene (Fig.…”

Section: IVmentioning

confidence: 99%

Recent Pedological Approach to Reconstruction of the Quaternary Environment in Japan and East Asia.

Watanabe

Sakagami

1999

Daiyonki-kenkyu

View full text Add to dashboard Cite

Evaluation of Pg absorption strength of humic acids as a paleoenvironmental indicator in buried paleosols on tephra beds, Japan

Cited by 9 publications

References 10 publications

Soil carbon stocks and carbon sequestration rates in seminatural grassland in Aso region, Kumamoto, Southern Japan

Soil carbon stocks and carbon sequestration rates in seminatural grassland in Aso region, Kumamoto, Southern Japan

Perylene in Lake Biwa sediments originating from Cenococcum geophilum in its catchment area

Recent Pedological Approach to Reconstruction of the Quaternary Environment in Japan and East Asia.

Contact Info

Product

Resources

About