Effects of saline water irrigation on soil properties in northwest China |
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| Authors: | Cui Hua Huang Xian Xue Tao Wang Roberto De Mascellis Giacomo Mele Quan Gang You Fei Peng Anna Tedeschi |
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| Institution: | (1) Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, 320 West Donggang Road, Lanzhou, 730000, China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100039, China;(3) Institute for Agricultural and Forest Mediterranean Systems, CNR, Via Patacca 85, Ercolano, 80056 Naples, Italy; |
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| 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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