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  1. 紀要論文
  2. 琉球大学農学部学術報告
  3. 25号
  1. 部局別インデックス
  2. 農学部

沖縄における農地保全の基礎的研究 VII : 国頭マーヂの土壌侵食標準試験区における流亡土量について(農業工学科)

http://hdl.handle.net/20.500.12000/4209
http://hdl.handle.net/20.500.12000/4209
38947316-d243-4d6a-8a1f-f3565f8e9bb8
名前 / ファイル ライセンス アクション
KJ00000161963.pdf KJ00000161963.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 沖縄における農地保全の基礎的研究 VII : 国頭マーヂの土壌侵食標準試験区における流亡土量について(農業工学科)
言語 ja
作成者 翁長, 謙良

× 翁長, 謙良

ja 翁長, 謙良

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
内容記述
内容記述タイプ Other
内容記述 本研究の観測期間中(昭和52年6月1日∿53年4月30日)における連続13mm以上の降雨回数は34で, それらの総和は約2,000mmであるが, その中で2回連続降雨の場合を除き, 毎降雨ごとの流亡土観測可能回数が27回であるが, 実際は欠測や2∿3回の降雨による1回の観測等もあって, 13回(20回降雨回数)の観測をもとにまとめたものである。結果は次のように要約されよう。1)観測期間中の降雨エネルギーは924(10^3mmt/ha・hr.)であり, Table 4のその期間の平均値689をはるかに上回るものである。2)観測された流亡土量(t/ha.)は8度区, 5度区, 3度区でそれぞれ506,353,202,であり土壌の仮比重(1.4)をもとに土層厚に換算するとそれぞれ3.6cm, 2.5cm, 1.4cmとなり極めて大きい侵食量といえる。3)一般に傾斜度が増せば流亡土量も増大する。4)降雨エネルギーと各傾斜別の流亡土量との間にはY=aX^bの関係が成り立ち, 特に5度区と3度区はXとYの相関が比較的高い。
内容記述タイプ Other
内容記述 This study has been done in order to establish criteria and guidelines applicable to field problems in northern parts of Okinawa, which excell in Kunigami Maji soils. These soils are usually acidic, infertile and erosive physically but productive of both pineapple and tea. The textural composition and physical properties of the soils are shown in Table 1. Three field plots have been selected for soil erosion experiment at Yaka, Kin-son. The plots were set at inclines of 8(A), 5(B), and 3(C) degrees, respectively. The period of observation is from June, 1977 to April 1978 and the rainfall of the area was calculated for this period. The data obtained are as shown in Table 5. The results of this observation are as follows : 1. The rainfall at Yaka was 924 (10^3mm tm/ha, hr, ) during the period of observation and this amount surpassed the annual average rainfall (689) in Naha. 2. The soil loss from the plots A, B, and C is 506t/ha. 353t/ha. and 202t/ha. respectively. 3. Generally, the soil loss increases with the increase of inclination. 4. The relationship between the amount of rainfall and the loss of soil is formulated as the equation Y=aX^b, where Y is soil loss in tons per ha. and the rainfall in 10^3mm・m・t per ha. hr.
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/20.500.12000/4209
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 25, p. 351-359, 発行日 1978-12-01
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