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Assessment of hydraulic redistribution on desert riparian forests in an extremely arid area

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Abstract

The roots of Populus euphratica, a plant that grows in the lower reaches of the Tarim River, Northwest China, exhibit a significant level of hydraulic redistribution; however, quantitative assessments of the water-sharing process and its ecological effects are limited. This study was designed to obtain such data using an assessment model based on field observation parameters, including soil water content (soil water potential), root distribution, and stable isotope δ18O values of soil and plant samples during the entire growing season. The results showed that hydraulic redistribution in P. euphratica can be detected in 0–120 cm soil layers, with the amount of hydraulically redistributed water (HRW) in the soil found at different depths as follows: 60–80 > 40–60 > 20–40 > 0–20 > 80–100 > 100–120 cm. The variations in HRW in soil layers can be partly attributed to the vertical distribution of roots. The denser roots found at greater depths positively influenced the amount of redistributed water in lower soil layers. During the growing season, the amount of HRW reached a daily average of 0.27 mm, which allowed increased transpiration and provided an adequate water supply to herbs. Based on the stable isotope (δ18O) data, the amount of HRW provided by the roots of P. euphratica could meet 22–41 % of its water demand.

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Acknowledgments

This work was financially supported by the West Light Foundation of the Chinese Academy of Science (grant No.RCPY200903) and the National Natural Science Foundation of Heihe River Project (grant No. 91025025). We thank the anonymous reviewers for their valuable comments that helped improve the paper.

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Correspondence to Xing-Ming Hao.

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Hao, XM., Li, Y. & Deng, HJ. Assessment of hydraulic redistribution on desert riparian forests in an extremely arid area. Environ Monit Assess 185, 10027–10038 (2013). https://doi.org/10.1007/s10661-013-3310-4

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  • DOI: https://doi.org/10.1007/s10661-013-3310-4

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