Journal of Integrative Agriculture ›› 2016, Vol. 15 ›› Issue (9): 2123-2131.DOI: 10.1016/S2095-3119(15)61263-1

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  • 收稿日期:2015-07-01 出版日期:2016-09-02 发布日期:2016-09-02

Effect of different water application intensity and irrigation amount treatments of microirrigation on soil-leaching coastal saline soils of North China

CHU Lin-lin1, 2, KANG Yao-hu2, WAN Shu-qin2   

  1. 1 Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Ministry of Education/ College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, P.R.China
    2 Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Science and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, P.R.China
  • Received:2015-07-01 Online:2016-09-02 Published:2016-09-02
  • Contact: KANG Yao-hu, Tel/Fax: +86-10-64856516, E-mail: Kangyh@igsnrr.ac.cn
  • About author:CHU Lin-lin, E-mail: LLchu5589@163.com;
  • Supported by:

    This study was supported by the National High-Tech R&D Program of China (2013 BAC02B02 and 2013BAC02B01), the National Science Foundation for Young Scientists of China (51409126, 31300530, 51409124), a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), China.

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Abstract:    In coastal regions, Bohai Gulf is one of the most affected areas by salinization. To study the effects of mocrosprinkler irrigation on the characteristics of highly saline sandy loam soil (ECe (saturated paste extract)=22.3 dS m–1; SAR (sodium adsorption ratio)=49.0) of North China, a laboratory experiment was conducted. Five water application intensity (WAI) treatments (1.7, 3.1, 5.3, 8.8, and 10.1 mm h–1), five irrigation amount (IA) treatments (148, 168, 184, 201, and 223 mm) and three time periods of water redistribution (0, 24 and 48 h) were employed in the study. A compounding microsprinkler system was used for the WAI treatments, and a single microsprinkler was used for the IA treatments. The results indicated that, as soil depth increased, soil water content (θ) increased and then slightly decreased; with WAI and IA consistently increasing, the relatively moist region expanded and the average θ increased. Meanwhile, soil ECe increased as soil depth increased, and the zone with low soil salinity expanded as WAI and IA increased. Although the reduction of the average SAR was smaller than that of the average electrical conductivity of the ECe, these variables decreased in similar fashion as WAI and IA increased under microsprinkler irrigation. The average pH decreased as soil depth increased. Longer time periods of water redistribution led to lower salinity and slight expansion of the SAR zone. Considering the effects of leached salts in coastal saline soils, greater WAI and IA values are more advantageous under unsaturated flow conditions, as they cause better water movement in the soil. After leaching due to microsprinkler irrigation, highly saline soil gradually changes to moderately saline soil. The results provide theoretical and technological guidance for the salt leaching and landscaping of highly saline coastal environments.

Key words: coastal saline soil ,  microsprinkler irrigation ,  SAR ,  reclamation