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| DOI：10.13522/j.cnki.ggps.2017.0582 |
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| Efficacy of a Drainage System in Remediating Saline-alkali Soils in the Alpine Region of Qinghai Province |
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ZHANG Zhenzhong, ZHANG Jinxu, HUANG Jiasheng, ZHANG Tan, TANG Da, HE Kangning, LI Runjie
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1.School of Soil and Water Conservation, Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Engineering Research Center of Soil and Water Conservation, Engineering Research Center of Forestry Ecological Engineering of Ministry of Education, Beijing Forestry University, Beijing 100083, China; 2.Institute of Water Resources and Hydropower of Qinghai Province, Xining 810001, China
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| Abstract: |
| 【Objective】 The objective of this paper is to present a drainage system as well as test of its efficacy in remediating saline-alkali soil in alpine region of Qinghai province. 【Method】 The work is part of a soil desalination project in Delhi (moderate salinization) and Nuomhon (severe salinization) in Qaidam Basin of Qinghai province, in which we studied salt leaching from the saline-alkali soils drained by a new system consisting of capillary-drainage belts and standard subsurface drain.【Result】 ①In both soils, salt leaching from the top 0~10 cm was faster than from the subsoil and the leaching rate from the moderate and severe salinized soils at the end of the experiment was 81.19% and 96.62% respectively. ②The results saw a significant decrease in contents of Cl-, SO42-, Na+ and K+ in the top 0~10 cm soil, indicating the system was effective in leaching these ions. ③Overall, the system leached 98.61% of salt in the moderate salinized soil and 94.41% of salt in the severe salinized soil. 【Conclusion】 In terms of leaching rate, irrigating 1 500 m3/hm2 water in four times is most efficient for the moderate salinized soil, and 1 500 m3/hm2 in four times most efficient for the severe salinized soil. |
| Key words: saline soil improvement; subsurface pipe; capillary-drainage belt; salt quota; soil salinity |
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