open access

https://doi.org/10.14943/lowtemsci.80.1

https://hdl.handle.net/2115/85017

Vertical distribution of organic matter, iron, phosphorus, and clay minerals accumulated in Ozegahara mire as a function of distance from rivers

日本語

phosphorus

2022-03-31

低温科学第80巻編集委員会

Low Temperature Science

80

1-23

To clarify the properties of inorganic components that have flowed into and accumulated in Ozegahara mire, soil and peat core samples were collected in the Yamanohana-tashiro, Kamitashiro, and Nakatashiro and analyzed for ignition loss, free iron contents, total phosphate contents, particle size distribution, and clay mineral composition at different depths. The ignition loss near the surface layer tended to be lower in the low moors and higher in the middle and high moors, fragmented forest, gallery forests. In the deeper layers, however, there were many sites with large fluctuations due to the influence of past flow paths, flooding, and volcanic eruptions. The free iron content tended to be higher near the surface layer. The total phosphate content showed a parabolic pattern in response to the increase in the ignition loss, suggesting that the distance from the river and both of absorption and accumulation by plant biomass contribute strongly to the accumulation of phosphate in mire soils. A large proportion of coarse size fractions were found in layers that were strongly affected by past river flooding, regardless of the region. As for the fine fractions (< 20 μm), the results of X-ray diffraction analysis showed that the mineral components derived from serpentine distributed upstream (Mt. Shibutsu) were significantly detected in the banks of the Nekomata River and Kawakami River and in the Yamanohana-tashiro. On the other hand, primary minerals such as quartz, cristobalite, and feldspar were deposited regardless of the area, suggesting a strong influence of wind deposition.

紀要論文

Version of Record

1880-7593