干旱区生态环境知识资源中心(Arid): Effect of Bypass-Flow on Leaching of Salts in a Cracking Soil in the Nile Delta

Arid

DOI	10.3390/w13070993
	Effect of Bypass-Flow on Leaching of Salts in a Cracking Soil in the Nile Delta
	Fujimaki, Haruyuki; Abd El Baki, Hassan Mohamed Fahmy
通讯作者	Fujimaki, H (corresponding author), Tottori Univ, Arid Land Res Ctr, Tottori 6800001, Japan.
来源期刊	WATER
EISSN	2073-4441
出版年	2021
卷号	13 期号:7
英文摘要	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.
英文关键词	salinity stress solute transport preferential flow drainage
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000638939100001
WOS类目	Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351953
作者单位	[Fujimaki, Haruyuki; Abd El Baki, Hassan Mohamed Fahmy] Tottori Univ, Arid Land Res Ctr, Tottori 6800001, Japan
推荐引用方式 GB/T 7714	Fujimaki, Haruyuki,Abd El Baki, Hassan Mohamed Fahmy. Effect of Bypass-Flow on Leaching of Salts in a Cracking Soil in the Nile Delta[J],2021,13(7).
APA	Fujimaki, Haruyuki,&Abd El Baki, Hassan Mohamed Fahmy.(2021).Effect of Bypass-Flow on Leaching of Salts in a Cracking Soil in the Nile Delta.WATER,13(7).
MLA	Fujimaki, Haruyuki,et al."Effect of Bypass-Flow on Leaching of Salts in a Cracking Soil in the Nile Delta".WATER 13.7(2021).