| 杜学军,闫彬伟,许紫峻,任雪芹,钱铭杰.脱硫石膏对苏打盐碱土水盐入渗过程的影响[J].干旱地区农业研究,2021,39(3):179~183 |
| 脱硫石膏对苏打盐碱土水盐入渗过程的影响 |
| Effect of desulfurized gypsum on water\|salt infiltration process of saline\|sodic soils |
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| DOI：10.7606/j.issn.1000-7601.2021.03.22 |
| 中文关键词: 脱硫石膏，苏打盐碱土，入渗模型，土壤水分，水盐运移 |
| 英文关键词:desulfurized gypsum saline\|sodic soils infiltration model soil moisture water\|salt movement |
| 基金项目:国家重点研发计划（2016YFC0501205, 2016YFC0501208, 2017YFD0200706）;国家自然科学基金（21775163） |
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| 中文摘要: |
| 为研究脱硫石膏对苏打盐碱土水盐入渗过程的影响，2020年6月进行了一项室内土柱入渗试验，供试土壤离子组成主要为Na2CO3和NaHCO3、电导率为1.89 mS·cm-1、钠吸附比为10.01、碱化度为40.20%，设置了5个脱硫石膏施用水平（施用量分别为土重的0.0%，0.5%，1.0%，1.5%，2.0%），并利用Philip和Kostiakov两种入渗模型描述土壤水分入渗过程。结果表明：在入渗时间为630 min时，0.5%、1.0%、1.5%、2.0%处理累积入渗量与0.0%处理相比分别增加20.00%、43.03%、61.21%、55.15%，入渗率分别增加64.94%、233.33%、271.86%、339.83%；当湿润锋运移至60 cm时，0.5%、1.0%、1.5%、2.0%处理所用时间比0.0%处理分别减少33.33%、63.89%、63.89%、70.83%；同时，脱硫石膏显著影响了Philip和Kostiakov入渗公式参数，随脱硫石膏用量的增加而增加，吸渗率S从0.0647 cm·min-0.5增加到0.0957 cm·min-0.5，稳定入渗率A从0.0024 cm·min-1增加到0.0189 cm·min-1，经验指数K从0.0165增加到了0.0698；在50~60 cm土层深度随着脱硫石膏用量的增加电导率逐渐增加，土壤脱盐效率增加。综上，脱硫石膏可以加快苏打盐碱土水分入渗速率，增加脱盐效率，对苏打盐碱土改良有很好的效果。 |
| 英文摘要: |
| In order to explore the effect of desulfurized gypsum on the infiltration process of saline\|sodic soils, a soil column infiltration experiment was conducted with 5 desulfurized gypsum application levels (0.0, 0.5%, 1.0%, 1.5%, and 2.0% of soil by weight) in June 2020. The ion composition of the tested soil was mainly Na2CO3 and NaHCO3 with 1.89 mS·cm-1 of the EC, 10.01 of the SAR, and 40.20% of ESP. Two infiltration models of Philip and Kostiakov were used to describe the process of soil moisture infiltration. The results showed that when the infiltration time was 630 min, the cumulative infiltration of 0.5%, 1.0%, 1.5%, and 2.0% treatments increased by 20.00%, 43.03%, 61.21%, and 55.15%, and the infiltration rate increased by 64.94%, 233.33%, 271.86%, and 339.83%, respectively, compared with 0.0% treatment. When the wetting front was moved to 60 cm, the time of 0.5%, 1.0%, 1.5%, and 2.0% treatments decreased by 33.33%, 63.89%, 63.89%, and 70.83%, respectively, compared with that of 0.0%. Meantime, desulfurized gypsum significantly affected the parameters of the infiltration formula of Philip and Kostiakov. The absorption rate, S, reached 0.0957 from 0.0647 cm·min-0.5, the stable infiltration rate, A, reached 0.0189 from 0.0024 cm·min-1, and the experience coefficient, K, reached 0.0165 from 0.0698 with increasing the amount of desulfurized gypsum application. At the depth of 50 cm to 60 cm, as the amount of desulfurization gypsum increased, the EC gradually increased, and the efficiency of soil desalination increased. In summary, desulfurized gypsum sped up the infiltration rate of alkaline soil water, increased the efficiency of desalination, and had a significant effect on the amelioration of saline\|sodic soils. |
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