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  1. 紀要論文
  2. 琉球大学農学部学術報告
  3. 46号
  1. 部局別インデックス
  2. 農学部

国頭マージの土壌表層におけるクラスト形成について

http://hdl.handle.net/20.500.12000/3670
http://hdl.handle.net/20.500.12000/3670
7feef9cc-0b0b-4b07-88d2-9b1a2bafbdc8
名前 / ファイル ライセンス アクション
KJ00000161880.pdf KJ00000161880.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2008-02-14
タイトル
タイトル 国頭マージの土壌表層におけるクラスト形成について
言語 ja
作成者 宮良, 志乃

× 宮良, 志乃

ja 宮良, 志乃

志茂, 守孝

× 志茂, 守孝

ja 志茂, 守孝

宜保, 清一

× 宜保, 清一

ja 宜保, 清一

翁長, 謙良

× 翁長, 謙良

ja 翁長, 謙良

Miyara, Shino

× Miyara, Shino

en Miyara, Shino

Shimo, Moritaka

× Shimo, Moritaka

en Shimo, Moritaka

Gibo, Seiichi

× Gibo, Seiichi

en Gibo, Seiichi

Onaga, Kenryo

× Onaga, Kenryo

en Onaga, Kenryo

アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
主題
言語 ja
主題Scheme Other
主題 クラスト
言語 ja
主題Scheme Other
主題 透水係数
言語 ja
主題Scheme Other
主題 粒径組成
言語 ja
主題Scheme Other
主題 国頭マージ
内容記述
内容記述タイプ Other
内容記述 雨水によるクラストの形成に伴う土壌表層の透水性と粒径組成の変化について検討し,以下の結果を得た。(1) 濁水の湛水に伴う土壌表層の透水係数(k)の変化については,150ppmにおいてk=1.33・(10)^<-3>cm/s,250ppmにおいてk=8.85・(10)^<-4>cm/sとなり,湛水前のk=3.61・(10)^<-3>cm/sよりも大幅に低下し,堆積クラストの形成が認められた。(2) 雨滴の衝撃に伴う土壌表層の透水係数(k)の変化については,降雨前のk=3.36・(10)^<-4>cm/sが,20分降雨後にk=1.23・(10)^<-4>cm/s,40分降雨後にk=3.09・(10)^<-5>cm/sとなり,構造クラストの形成が認められた。(3) また,土壌表層では雨滴の衝撃に伴って,粗砂・細砂の粗粒分の減少があり,飛散による影響が認められた。なお,雨水によるクラストの形成については,透水係数や粒径組成の変化による検証のみでは不充分であり,更に追究し,そのメカニズムを明らかにする予定である。
内容記述タイプ Other
内容記述 Approaches were made to examine the variation of infiltration capacity and particle size distribution of soil in the crusting process induced by rainfall in this paper. Following the accumulating of clouding water, the hydraulic conductivity (k) of soil surface greatly decreased from 1.33×(10)^<-3>cm/s before watering to 3.61×(10)^<-3>cm/s and 8.85×(10)^<-4>cm/s respectively for the cases watered with 150ppm and 250ppm clouding water. It reveals that a kind of accumulated crust had been formed. Furthermore, the hydraulic conductivity varied with the compaction of raindrops. Before the rainfall started, k was 3.36×(10)^<-4>cm/s, and then it declined to 1.23×(10)^<-4>cm/s and 3.09×(10)^<-5>cm/s at the times of 20 and 40 minute after raining. It could be confirmed that a kind of structural crust had been developed. Also, impacting of raindrops reduced the coarse and fine sand fraction on soil surface due to the influence of splashing.
内容記述タイプ Other
内容記述 紀要論文
出版者
言語 ja
出版者 琉球大学農学部
言語
言語 jpn
資源タイプ
資源タイプ departmental bulletin paper
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
識別子
識別子 http://hdl.handle.net/20.500.12000/3670
識別子タイプ HDL
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0370-4246
収録物識別子タイプ NCID
収録物識別子 AN00250548
収録物名
言語 ja
収録物名 琉球大学農学部学術報告
書誌情報
号 46, p. 109-112
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