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
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‰.
李阳明,涂安国,谢颂华*,郑海金,卢玉东,. 保水剂对红砂岩土壤持水特性的影响[J]. 排灌机械工程学报, 2022, 40(7): 714-720.
LI Yangming,TU Anguo,XIE Songhua*,ZHENG Haijin,LU Yudong,. Effect of super absorbent polymers on water-holding characteristics of red sandstone soil. Journal of Drainage and Irrigation Machinery Engin, 2022, 40(7): 714-720.
