| Cite this article: | 蒋茜,吴凤平,谭帅,等.积水入渗下非常规水矿化度对红壤水盐运移特征的影响[J].灌溉排水学报,0,():-. |
| JIANG Xi,WU Feng-ping,TAN Shuai,et al.积水入渗下非常规水矿化度对红壤水盐运移特征的影响[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Effect of Salinity of Unconventional Water on Water and Salt Transport Characteristics of Red Soil under water Infiltration |
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JIANG Xi, WU Feng-ping, TAN Shuai, WANG Hui, SONG Cheng-ye, CHEN Ting, LI Qian-qian, MENG Zhi-xiong
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College of Water Resources and Civil Engineering, Hunan Agricultural University
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| Abstract: |
| 【Objective】To discuss the effect of unconventional water salinity on water and salt transport characteristics of acid red soil in southern China,【Method】one-dimensional vertical soil column infiltration experiment was conducted to investigate the dynamic water movement, water-salt distribution and soil’s pH change of southern Red Soil under unconventional water infiltration with different salinity (1, 2, 3, 5, 10 g/L), and quantitatively characterized the relationship between salinity and infiltration model parameters.【Result】compared with CK, 1~10 g/L treatment inhibited water infiltration of red soil at the later stage of infiltration. At the same time, the infiltration of CK>1 g/L>5 g/L>2 g/L >3 g/L>10 g/L was observed. The initial cumulative infiltration amount and water holding capacity of 5 g/L treatment were significantly higher than those of other treatments (p<0.05), the infiltration velocity decreased with the increase of infiltration duration, and the migration distance of wetting front per unit time was smaller than that of CK and 1, 2 g/L treatments. Kostiakov formula is more accurate than Philip"s equation to describe the cumulative infiltration of red soil with 1~3 g/L, but the opposite is true when the salinity is greater than 3 g/L. The relationship between the cumulative infiltration amount and the migration distance of wetting front can be described by linear relationship. The relationship between water holding capacity, infiltration model parameters and mineralization degree satisfies cubic polynomial (R2>0.95, RMSE<0.06 cm). The average soil water content was increased by 0.09% ~ 4.61% in the treatment of 1~5g/L in the range of 5~25 cm. The EC Value and Na+ and Cl- ion contents decreased with the increase of soil depth. The effect of salinity on soil salinity in the range of 25~40 cm was less than that of the upper soil. Compared with CK, 1~5 g/L treatment increased soil acidification, while 10 g/L treatment increased soil pH.【Conclusion】The different effects of salinity on soil acidification and dispersion are the reasons for the difference of water and salt transport characteristics of acid soil. It is helpful to establish water and salt transport model of red soil irrigated by unconventional water in southern China. |
| Key words: Salinity; red soil; one-dimensional infiltration; water and salt distribution; infiltration model |
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