Abstract
Due to the lack of freshwater, highly saline groundwater was the main irrigation source in the last few decades in the Minqin Basin, which is in northwest China. The study evaluates the effects of salt accumulation on the soil physical–chemicals properties. Undisturbed and disturbed soil samples were taken from the experiment site, which was irrigated with saline water at a concentration of 0.8, 2 and 5 g L−1 (coded later as C08, C2 and C5). Undisturbed soil samples, at depths of 0–45 and 45–60 cm were taken to determine the water retention curve (WRC). Moreover, in the same place, another set of undisturbed soil samples were taken to determine the porosity and pore-size distribution (PoSD). From the WRC, the water-holding capacity of the soil was estimated. Disturbed soil samples at depths of 0–20, 0–45, 45–60 and 80–100 cm were taken to determine the index of aggregates stability in water (IC). The electrical conductivity of the saturated paste (ECe) was determined at depths of 0–30, 30–60 and 60–90 cm, during the irrigation season on C08, C2 and C5 treatments. The results show that the total porosity and the index of aggregates stability in water decrease with the increasing salinity of irrigation water, and the ECe increases with the increasing salinity of irrigation water especially in the surface soil. The water-holding capacity (WHC) of soil also increases with the increasing salinity of irrigation water.
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Acknowledgments
The authors would like to thank Dr. A. Basile for the careful comments, Miss N. Orefice for performing the hydrological measurements on the undisturbed soil samples, Mr. B. Di Matteo for performing the porosity and image analysis measurements, and Dr. M. Riccardi for performing the chemical analysis. The author also expresses particular thanks to Gansu Minqin National Studies Station for Desert Steppe Ecosystem for providing meteorological data and caring during the field experiment. This study was supported by funds from the National Natural Science Foundation of China (30870412), West Light Foundation of the Chinese Academy of Sciences (O728551001) and Ministry of Science and Technology of China (2009CB421308). Moreover, it was supported also by scientific bilateral cooperation 2004-2007/2008-2010 between CNR/Chinese Academy of Science and by the Short Term Mobility program funded by CNR 2007-2008.
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Huang, C.H., Xue, X., Wang, T. et al. Effects of saline water irrigation on soil properties in northwest China. Environ Earth Sci 63, 701–708 (2011). https://doi.org/10.1007/s12665-010-0738-5
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DOI: https://doi.org/10.1007/s12665-010-0738-5