Characterization of the differences and algal-available fractions of P in soils, suspended solids, and bottom sediments have been the main topics of research during the past decade. However, the size distribution and properties of particulate matter in runoff have not been much studied in Japan. Here we study particle size distribution during runoff and the chemical characteristics of P in each soil size fraction and relate them to land use. The temporal variation of particulate sizes during rain events is different in each watershed. Most particles have the size in the range of 10∼100 μm. Also, the percentage of BAP in TP as well as percentage of PCOD in SS also varies temporally and spatially during runoff. To investigate how soil particles characteristics depend on land use, soil samples from two watersheds are examined. For particle size distribution and specific gravity, no significant difference among watersheds is found. However, C, N, and P content are indirectly proportional to the particle size, which means smaller particle size results in larger. H2O-extracted P, NH4Cl-extracted P, NAI-P, Apatite-P, Organic-P, and TP contents in each soil particle sample vary depending on particle size, land use, and watershed.
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Research Article|
February 01 2005
A study of SS size distribution during runoff and fractionation of phosphates depending on soil size in agricultural watershed
S.-H. Sa;
1Department of Social Systems Engineering, Tottori University, Koyama, Tottori 680-8552, Japan (E-mail: , masuda@sse.tottori-u.ac.jp, hosoiy@sse.tottori-u.ac.jp)
E-mail: sa@sse.tottori-u.ac.jp
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T. Masuda;
T. Masuda
1Department of Social Systems Engineering, Tottori University, Koyama, Tottori 680-8552, Japan (E-mail: , masuda@sse.tottori-u.ac.jp, hosoiy@sse.tottori-u.ac.jp)
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Y. Hosoi
Y. Hosoi
1Department of Social Systems Engineering, Tottori University, Koyama, Tottori 680-8552, Japan (E-mail: , masuda@sse.tottori-u.ac.jp, hosoiy@sse.tottori-u.ac.jp)
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Water Sci Technol (2005) 51 (3-4): 393–400.
Citation
S.-H. Sa, T. Masuda, Y. Hosoi; A study of SS size distribution during runoff and fractionation of phosphates depending on soil size in agricultural watershed. Water Sci Technol 1 February 2005; 51 (3-4): 393–400. doi: https://doi.org/10.2166/wst.2005.0614
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