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Journal of Arid Land  2013, Vol. 5 Issue (3): 396-407    DOI: 10.1007/s40333-013-0173-z
Research Articles     
Patterns, magnitude, and controlling factors of hydraulic redistribution of soil water by Tamarix ramosissima roots
TengFei YU1,2, Qi FENG2,3*, JianHua SI2,3, HaiYang XI2,3, Wei LI2
1 Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China;
2 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
3 Gansu Hydrology and Water Resources Engineering Research Center, Lanzhou 730000, China
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Abstract   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 (θ), 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 evi-dent diurnal fluctuations in θ at the depths of 30 and 50 cm, indicating “hydraulic lift” (HL). θ 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.

Key wordsvegetation fractional coverage (VFC)      VBSI (vegetation, bare soil and shadow indices)      dimidiate pixel model      delta oasis of Weigan and Kuqa rivers     
Received: 11 December 2012      Published: 10 September 2013

This study was supported by the Key Project of the Chinese Academy of Sciences (KZZD-EW-04-05), the National Natural Science Foundation of China (91025024), and the Western Light Project of the Chinese Academy of Sciences.

Corresponding Authors: Qi FENG     E-mail:
Cite this article:

TengFei YU, Qi FENG, JianHua SI, HaiYang XI, Wei LI. Patterns, magnitude, and controlling factors of hydraulic redistribution of soil water by Tamarix ramosissima roots. Journal of Arid Land, 2013, 5(3): 396-407.

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