フルテキストファイル
著者
藤巻 晴行 Arid Land Research Center, Tottori University 研究者総覧 KAKEN
Abd El Baki, Hassan Mohamed Fahmy Arid Land Research Center, Tottori University
キーワード
salinity stress
solute transport
preferential flow
drainage
抄録
Salinity is a major threat to the sustainability of irrigated agriculture in arid and semi-arid regions. Leaching is the primary measure for removing excess salts from the root zone, but not all water applied to the soil surface contributes to the removal of salts. In clayey soils, bypass flow along cracks can occur without being mixed with saline pore water in the matrix. To present a field dataset to quantitatively evaluate the contribution of bypass flow to the leaching of salts, soil sampling and monitoring of groundwater and discharge from a tile drain were carried out in farmland having a cracking soil in the Nile Delta. The electrical conductivities of 1:2 extracts were measured to evaluate the salinity of the soil. The first evidence for the occurrence of significant bypass flow through cracks was the salinity of the pore water, which was nearly triple that of the shallow groundwater and outflow from drainage. Second, the difference in root zone salinity before and after paddy rice cultivation was not significant. Third, the gradient of the groundwater table was very small. in spite of the low saturated hydraulic conductivity. Fourth, the salinity of the outflow from the tile drain dropped just after irrigation or rain. These results indicated that bypass flow through cracks played a significant role in the drainage process in the soil, and that nearly half of the water bypasses through cracks in the field with a cracking soil.
出版者
MDPI
資料タイプ
学術雑誌論文
外部リンク
EISSN
20734441
掲載誌名
WATER
13
7
開始ページ
993
発行日
2021-04
出版者DOI
著者版フラグ
出版社版
著作権表記
(C) 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
掲載情報
Fujimaki Haruyuki, Abd El Baki Hassan Mohamed Fahmy. Effect of Bypass-Flow on Leaching of Salts in a Cracking Soil in the Nile Delta. WATER. 2021. 13(7). doi:10.3390/w13070993
部局名
附属教育研究施設
言語
英語
Web of Science Key ut
WOS:000638939100001