干旱区生态环境知识资源中心(Arid): Soil substrate as a cascade of capillary barriers for conserving water in a desert environment:lessons learned from arid nature

Arid

	Soil substrate as a cascade of capillary barriers for conserving water in a desert environment:lessons learned from arid nature
	Al-Maktoumi Ali; Al-Ismaily Said; Kacimov Anvar; Al-Busaidi Hamed; Al-Saqri Said; Al-Hadabi Mansour
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2014
卷号	6 期号:6 页码:690-703
英文摘要	Interaction between soil pedogenesis, subsurface water dynamics, climate, vegetation and human ingenuity in a desert environment has been found to result in a unique ecohydrological system with an essentially three dimensional sedimentation structure in the bed of a recharge dam in Oman. A 3-D array of silt blocks sandwiched by dry sand-filled horizontal and vertical fractures was studied in pot experiments as a model of a natural prototype. Pots are filled with a homogenous sand-silt mixture(control) or artificially structured(smart design, SD) soil substrates. Rhodes grass and ivy(Ipomea, Convolvulaceae) were grown in the pots during the hottest season in Oman. Soil moisture content(SMC) was measured at different depths over a period of 20 days without irrigation. SD preserved the SMC of the root zone for both ivy and grass(SMC of around 25%-30% compared to <10% for control, 3 days after the last irrigation). Even after 20 days, SMC was around 18% in the SD and 7% in the control. This, similar to the case of a natural prototype, is attributed to the higher upward capillary movement of water in control pots and intensive evaporation. The capillary barrier of sand sheaths causes discontinuity in moisture migration from the micro-pores in the silt blocks to sand pores. The blocks serve as capillarity-locked water buffers, which are depleted at a slow rate by transpiration rather than evaporation from the soil surface. This creates a unique ecosystem with a dramatic difference in vegetation between SD-pots and control pots. Consequently, the Noy-Meir edaphic factor, conceptualizing the ecological impact of 1-D vertical heterogeneity of desert soils, should be generalized to incorporate 3-D soil heterogeneity patterns. This agro-engineering control of the soil substrate and soil moisture distribution and dynamics(SMDaD) can be widely used by desert farmers as a cheap technique, with significant savings of irrigation water.
英文关键词	soil capillary barrier infiltration soil heterogeneity ecohydrology hydropedology plant root soil moisture content
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Agriculture
CSCD记录号	CSCD:5264381
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335410
作者单位	Al-Maktoumi Ali, Department of Soils, Water and Agricultural Engineering, Sultan Qaboos University, Muscat, Sultanate of Oman.; Al-Ismaily Said, Department of Soils, Water and Agricultural Engineering, Sultan Qaboos University, Muscat, Sultanate of Oman.; Kacimov Anvar, Department of Soils, Water and Agricultural Engineering, Sultan Qaboos University, Muscat, Sultanate of Oman.; Al-Busaidi Hamed, Department of Soils, Water and Agricultural Engineering, Sultan Qaboos University, Muscat, Sultanate of Oman.; Al-Hadabi Mansour, Department of Soils, Water and Agricultural Engineering, Sultan Qaboos University, Muscat, Sultanate of Oman.; Al-Saqri Said, EcOman Centre, Petroleum Development Oman LLC, Muscat, Sultanate of Oman.
推荐引用方式 GB/T 7714	Al-Maktoumi Ali,Al-Ismaily Said,Kacimov Anvar,et al. Soil substrate as a cascade of capillary barriers for conserving water in a desert environment:lessons learned from arid nature[J],2014,6(6):690-703.
APA	Al-Maktoumi Ali,Al-Ismaily Said,Kacimov Anvar,Al-Busaidi Hamed,Al-Saqri Said,&Al-Hadabi Mansour.(2014).Soil substrate as a cascade of capillary barriers for conserving water in a desert environment:lessons learned from arid nature.Journal of Arid Land,6(6),690-703.
MLA	Al-Maktoumi Ali,et al."Soil substrate as a cascade of capillary barriers for conserving water in a desert environment:lessons learned from arid nature".Journal of Arid Land 6.6(2014):690-703.