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| Spatial distribution features of soil water and salt with drip irrigation under mulch in Shiyanghe Basin |
| YANG Zhenghua1, WANG Zengli2, DONG Pingguo2, YANG Hongwei1 |
| 1.Shiyanghe Basin Authority of Gansu Province, Wuwei, Gansu 733000, China; 2.Integrated Service Centre on Water Conservancy Technologies in Wuwei City, Wuwei, Gansu 733000, China |
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Abstract Field experiments are conducted with drip irrigation under mulch in spring maize growth period to identify spatial distribution features of soil water and salt. The results show that the soil moisture content time-space distribution was influenced by irrigation quota. In irrigation period, the soil moisture content in 0-20 cm layer increases significantly. The desalination layer depth increases with increasing irrigation quota. The obvious desalination occurs in 0-20 cm layer, while soil salt accumulates in 40-100 cm thick layer. The salt-leaching is better in the horizontal direction than in the vertical direction, further the salt-leaching is better along the direction from one emitter to another than along the direction from one drip irrigation belt to another belt. In no-irrigation period, soil moisture obviously decreases in 0-60 cm layer because soil water declines continuously caused from a strong evapotranspiration. The soil migrates with water from a deep soil layer to a shallow one. Soil salification occurs in 0-40 cm layer and soil desalination emerges in 40-100 cm layer. However, the desalination develops in whole 0-100 cm layer in border irrigation schedule. The coefficients of variation of soil water and salt are in moderate and low intensity before the jointing stage. Since then, the coefficients of soil water content and salt content are all in moderate intensity after that stage, but the coefficient of variation of soil salt content is lower than that of soil water.
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Received: 10 April 2016
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