大宮台地における伝統客土「ドロツケ」による人為的土壌生成とその農業的意義  [in Japanese] Anthropogenic pedogenesis by traditional soil dressing, "Dorotsuke", and its significance for agriculture in the Omiya tableland  [in Japanese]

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Abstract

大宮台地の西縁部では,荒川の河川敷に存在する沖積土を台地上の火山灰土畑に運びこむ「ドロツケ」という客土作業が続けられていた.本研究は,ドロツケによる人為的土壌生成過程における土壌特性の変化を明らかにすることを目的として,長年のドロツケにより,沖積土が元来の土壌の上に厚く堆積した埼玉県北本市の圃場の土壌,台地上の火山灰土,および河川敷沖積土において,土壌断面調査と土壌理化学性の分析を行い相互に比較した.ドロツケにより,土壌の固相部が増大し,最大容水量および水分含量が減少した.沖積土中のAl_oおよびSi_o含量は,火山灰土の1/10以下であった.この沖積土の客土により,ドロツケ畑では客土層上層ほどリン酸吸収係数が減少し,可溶性無機態リン酸の内のCa型リン酸の割合,有効態リン酸量が増大した.沖積土には多量の交換性Caが含まれることにより,ドロツケ畑にCaが供給され,土壌pHも上昇した.ただし,ドロツケ畑では,Caの溶脱傾向が著しく,とくに,作土層では,土壌pHが低い値を示した.客土層の厚さと乾燥密度ならびにSi_oの分析結果から,この圃場への客土投入量は,1ha当たり5000t程度と試算された.

On the western edge of the Omiya tableland, the soil-dressing practice known as "Dorotsuke" had been in place for a long time before second half of 20^<th> century. Dorotsuke involves carrying alluvial soil from the dry riverbed of the Arakawa River to fields on the tableland, where volcanic ash soil prevail. The present study aims to investigate anthropogenic pedogenesis by the practice of Dorotsuke. The soil profile of a field in Kitamoto City, Saitama Prefecture, having thick alluvial soil due to the practice of Dorotsuke was examined. The soil in this field was compared with the volcanic ash soil from the Omiya tableland, and also with the alluvial soil from the dry riverbed of the Arakawa River in order to clarify the changes in soil properties through the practice of Dorotsuke. Solid phase rate had increased, while the maximum water-holding capacity and water content had decreased in the soil of the Dorotsuke field due to the dressing of alluvial soil. Amounts of oxalate-soluble aluminum and silica in the alluvial soil were less than one-tenth of the amounts in the volcanic ash soil. The dressing of alluvial soil in the Dorotsuke field resulted in a decrease in the phosphate absorption coefficient and an increase in the relative amounts of calcium phosphate and the amounts of available phosphate. Alluvial soil contains a great deal of exchangeable calcium, which provides a supply of calcium and increases the soil pH of the Dorotsuke field. However, there was an apparent tendency for calcium to be leached from the Dorotsuke field, resulting in a lower pH in the upper horizon. The amount of alluvial soil brought into the field was assumed to be about 5000tons per 1 hectare, based on a calculation incorporating soil thickness, bulk density and amounts of oxalate-soluble silica.

Journal

  • Japanese Journal of Soil Science and Plant Nutrition

    Japanese Journal of Soil Science and Plant Nutrition 81(6), 573-583, 2010

    Japanese Society of Soil Science and Plant Nutrition

References:  52

Cited by:  1

Codes

  • NII Article ID (NAID)
    110008144223
  • NII NACSIS-CAT ID (NCID)
    AN00195767
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0029-0610
  • NDL Article ID
    10941216
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産)
  • NDL Call No.
    Z18-331
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE 
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