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| Effect of super absorbent polymers on water-holding characteristics of red sandstone soil |
| LI Yangming1,2,3, TU Anguo2, XIE Songhua2*, ZHENG Haijin2, LU Yudong1,3 |
| 1. School of Water and Environment, Chang′an University, Xi′an, Shaanxi 710054, China; 2. Jiangxi Institute of Soil and Water Conservation, Nanchang, Jiangxi 330029, China; 3. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang′an University, Xi′an, Shaanxi 710054, China |
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Abstract In order to explore the effect of applying super absorbent polymers(SAP)on water retention characteristics of red sandstone soil, under condition that SAP at mass ratios of 0, 0.25‰, 0.50‰, 1.00‰, 2.00‰ was mixed to red sandstone soil. The soil water characteristic curve, the soil infiltration process and the soil water moisture evaporation process under different ratios of SAP mea-sures were measured. Meanwhile, the quadratic curve was used to determine the optimal application amount. The results show that the saturated water content(θs)has an increasing trend as the use amount of SAP increases, and the values of residual water content(θr), intake value related parameters(α), and shape factor(n)generally increase first and then decreasing. The SAP mainly increases soil gravity water. Thus, the application of SAP inhibits the infiltration performance of soil, reduces the vertical infiltration rate of water, prolonges the duration of infiltration, and the soil water evaporation retarded. Comprehensively considering the water retention effect and application amount, the optimum SAP application range for red sandstone soil is maintained at 0.5‰-1.0‰.
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Received: 07 August 2020
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