島尻マージ圃場における地中灌漑の適用と土壌水分動態の解明

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タイトル別名
  • Evaluation of Soil Water Movement Under Subsurface Irrigation in Dark-red Clay Soil Fields in Okinawa
  • シマジリ マージ ホジョウ ニ オケル チチュウカンガイ ノ テキヨウ ト ドジョウ スイブン ドウタイ ノ カイメイ

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抄録

The Okinawa islands are classified as subtropical climate and various crops are produced taking advantage of the characteristic climate. However some crops including tropical fruits or flowers need lots of irrigation water and the needs of a method to save the irrigation water have increased. The objective of this study is to evaluate the soil water movement under the subsurface irrigation in the special dark-red clay soil field (called Shimajiri Maaji) in Okinawa Prefecture. To predict the soil water movement, a numerical model, HYDRUS-2D reported the efficiency to clarify the soil water movement under the subsurface irrigation, was introduced. The soil water movement in the dark-red clay field under the subsurface irrigation was estimated using the soil physical parameters and subsurface irrigation scheme. To verify the accuracy of the model, field observation was conducted in the subsurface irrigated field. The temporal changes of the volumetric water content were measured at the four layers in this field. The result indicated that the soil water content around the relative shallow layer did not change when the irrigation water was supplied by the subsurface irrigation and the subsurface irrigation is effective to reduce the irrigation water loss by the evaporation from the soil surface. The simulated result had good agreement with measured volumetric water content. The numerical model introduced here is effective for water saving irrigation regime in the special dark-red clay soil under the subsurface irrigation.

収録刊行物

  • 粘土科学

    粘土科学 52 (3), 123-128, 2014

    一般社団法人 日本粘土学会

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