| 论银北灌区的盐害指标与排引比 |
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| 关键词:salt harm harmful salt content drainage-diversion ratio water-salt balance Yinbei irrigation area |
| 基金项目:国家“九五”科技攻关项目(96-912-06-01)，国家自然科学基金(59979028) |
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| 摘要: |
| A Discussion on the Salt Harm Index and the Drainage-Diversion Ratio in Yinbei Irrigation Area |
| This paper proposes a method for evaluating salt-logging and desalination status and salted-soil improvement in irrigated areas with harmful salt content (HSC) and its drainage-diversion ratio (DDR) instead of previous solids (TDS) and its DDR as the index. This method is of pertinency and authenticity. Through water-salt balances calculation, it is verified that the DDR of HSC is 1.7 times that of TDS. It is also revealed that the irrigation area has been in the desalination status in the past 35 years. The drainage-diversion difference of HSC is positive and, as a result, 13.76 million tons of accumulated HSC have been discharged from the irrigation area. The drainage-diversion difference of non-HSC is negative, and hence 6.4 million tons of accumulated non-HSC have deposited in the irrigated area. This is of theoretical significance and practical value in regulating DDR of irrigation and cutting down the Yellow River diversion. Increasing groundwater portion of ditch drainage water is an important way to speed up desalination and salted soil improvement in irrigation areas. |
| WANG Lin,GAN Hong,YU Fu-liang,WANG Shan.2001.A Discussion on the Salt Harm Index and the Drainage-Diversion Ratio in Yinbei Irrigation Area[J].Acta Geoscientica Sinica,22(1):91-96. |
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