Pattern of Occurrence of Surface Soil Separation in Paddy Fields.

DOI
  • Muraoka Tetsuro
    Research Institute, The Japan Association for Advancement of phyto-Regulators (JAPR)
  • Kamoi Michiaki
    Office, The Japan Association for Advancement of Phyto-Regulators (JAPR)
  • Noritake Koji
    Research Institute, The Japan Association for Advancement of phyto-Regulators (JAPR)

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Other Title
  • 水田における表層剥離の発生機構

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Description

To analyse the occurrence of surface soil separation (S. S. S.) in paddy fields, we studied the external appearance of the S. S. S. layer and the changes in the population of associated algal species in the layer.<br>Furthermore, we studied the role of diatoms (Bacillariophyceae) during the initial stage of layer formation.<br>The formation of the S. S. S. layer in paddy fields exhibited the following sequence. Firstly, the fine soil particles that accumulated on the soil surface after puddling aggregated rapidly due to the activity of diatoms, leading to the formation of a thin, light brown layer. Secondly, the diatom population continued to increase resulting in further aggregation of soil particles. Furthermore, on this stage, the increase in the photosynthetic activity of algae resulted in the accumulation of oxygen which subsequently led to the floating of the layer. Thirdly, filamentous blue-green algae (Cyanophyceae) i. e. Osillatoria sp. started to grow and then become dominant, conferring a green color to the layer. Finally, due to the large population of blue-green algae soil particles, become more tightly bound resulting in the strengthening of the layer.

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Details 詳細情報について

  • CRID
    1390001204279394176
  • NII Article ID
    130003811266
  • DOI
    10.3719/weed.42.227
  • ISSN
    18824757
    0372798X
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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