干旱区生态环境知识资源中心(Arid): Patterns,magnitude,and controlling factors of hydraulic redistribution of soil water by Tamarix ramosissima roots

Arid

	Patterns,magnitude,and controlling factors of hydraulic redistribution of soil water by Tamarix ramosissima roots
	Yu Tengfei; Feng Qi; Si Jianhua; Xi Haiyang; Li Wei
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2013
卷号	5 期号:3 页码:396-407
英文摘要	Tamarix spp.(Saltcedar)is a facultative phreatophyte that can tolerate drought when groundwater is not accessed.In addition to deep water uptake,hydraulic redistribution(HR)is another factor contributing to the drought tolerance of Tamarix spp.In this study,data on soil volumetric moisture content(theta),lateral root sap flow,and relevant climate variables were used to investigate the patterns,magnitude,and controlling factors of HR of soil water by roots of Tamarix ramosissima Ledeb.in an extremely arid land in Northwest China.Results showed evident diurnal fluctuations in theta at the depths of 30 and 50 cm,indicating "hydraulic lift"(HL).theta increased remarkably at 10 and 140 cm but decreased at 30 and 50 cm and slightly changed at 80 cm after rainfall,suggesting a possible "hydraulic descent"(HD).However,no direct evidence was observed in the negative flow of lateral roots,supporting HR(including HL and HD)of T.ramosissima.The HR pathway unlikely occurred via lateral roots;instead,HR possibly occurred through adventitious roots with a diameter of 2-5 mm and a length of 60-100 cm.HR at depths of 20-60 cm ranged from 0.01-1.77 mm/d with an average of 0.43 mm/d,which accounted for an average of 22% of the estimated seasonal total water depletion at 0-160 cm during the growing season.The climate factors,particularly vapor pressure deficit and soil water potential gradient,accounted for at least 33% and 45% of HR variations with depths and years,respectively.In summary,T.ramosissima can be added to the wide list of existing species involved in HR.High levels of HR may represent a considerable fraction of daily soil water depletion and substantially improve plant water status.HR could vary tremendously in terms of years and depths,and this variation could be attributed to climate factors and soil water potential gradient.
英文关键词	drought tolerance phreatophyte hydraulic redistribution root sap flow Tamarix ramosissima
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:4899902
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335217
作者单位	Yu Tengfei, Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou, Gansu 730000, China.; Feng Qi, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Gansu Hydrology and Water Resources Engineering Research Center, Lanzhou, Gansu 730000, China.; Si Jianhua, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Gansu Hydrology and Water Resources Engineering Research Center, Lanzhou, Gansu 730000, China.; Xi Haiyang, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Gansu Hydrology and Water Resources Engineering Research Center, Lanzhou, Gansu 730000, China.; Li Wei, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.
推荐引用方式 GB/T 7714	Yu Tengfei,Feng Qi,Si Jianhua,et al. Patterns,magnitude,and controlling factors of hydraulic redistribution of soil water by Tamarix ramosissima roots[J],2013,5(3):396-407.
APA	Yu Tengfei,Feng Qi,Si Jianhua,Xi Haiyang,&Li Wei.(2013).Patterns,magnitude,and controlling factors of hydraulic redistribution of soil water by Tamarix ramosissima roots.Journal of Arid Land,5(3),396-407.
MLA	Yu Tengfei,et al."Patterns,magnitude,and controlling factors of hydraulic redistribution of soil water by Tamarix ramosissima roots".Journal of Arid Land 5.3(2013):396-407.