脱硫石膏与粉煤灰配施对碱化土壤改良及苜蓿生长的影响OACSTPCD
Improving alfalfa growth through amending alkalized soil with mixture of desulfurization gypsum and fly ash
[目的]筛选适宜新垦龟裂碱化土壤改良和苜蓿生长的脱硫石膏和粉煤灰配比.[方法]采用小区试验,试验设置CK(脱硫石膏 0、粉煤灰 0)、T1(脱硫石膏 30 t/hm2、粉煤灰 15 t/hm2)、T2(脱硫石膏 30 t/hm2、粉煤灰 30 t/hm2)、T3(脱硫石膏 30 t/hm2、粉煤灰 45 t/hm2)、T4(脱硫石膏 45 t/hm2、粉煤灰 15 t/hm2)、T5(脱硫石膏 45 t/hm2、粉煤灰 30 t/hm2)、T6(脱硫石膏 45 t/hm2、粉煤灰 45 t/hm2)共 7个处理,研究脱硫石膏和粉煤灰配施对土壤pH值、碱化度和可溶性盐量及苜蓿生长影响.[结果]脱硫石膏和粉煤灰配施显著改善龟裂碱化土壤物理性质,与CK相比,T3处理土壤体积质量降低7.69%,土壤孔隙度和田间持水率分别提高9.69%和18.70%;脱硫石膏和粉煤灰配施对0～40 cm土层土壤化学性质改良效果较好,T4处理 0～10、10～20 cm土层土壤pH值分别降低 10.51%、11.66%,碱化度分别降低 56.76%和 50.27%;T4 处理 0～10、10～20、20～40 cm土层土壤可溶性盐量分别下降 32.33%、52.55%、3.04%;T4、T1 处理苜蓿增产效果较好,与CK相比,苜蓿鲜质量分别提高 61.76%、43.21%,干物质量分别提高 48.80%、30.72%;但脱硫石膏和粉煤灰配施量过大则会造成减产,T6 处理苜蓿鲜质量和干物质量分别较 CK 降低 19.69%、10.24%.[结论]脱硫石膏和粉煤灰配合施用能有效降低龟裂碱化土壤的体积质量、pH值、碱化度和可溶性盐量,提高土壤孔隙度、田间持水率,从而有利于苜蓿的生长和发育,其中 45 t/hm2 脱硫石膏与 15 t/hm2 粉煤灰为最优配比组合.
[Objective]Soil alkalinization is an abiotic stress affecting agricultural production in many countries.Amending it by soil conditioners is a technique to ameliorate the adversary effect of alkalization and safeguard crop growth.In this paper,we study the efficacy of mixture of desulfurization gypsum and fly ash for improving alfalfa growth in a newly reclaimed alkalized soil.[Method]The field experiments were conducted in plots which were amended with mixture of desulfurization gypsum and fly ash at different ratios:30 t/hm2 of desulfurization gypsum and 15 t/hm2 of fly ash(T1),30 t/hm2 of desulfurization gypsum and 30 t/hm2 of fly ash(T2),30 t/hm2 of desulfurization gypsum and 45 t/hm2 of fly ash(T3),45 t/hm2 of desulfurization gypsum and 15 t/hm2 of fly ash(T4),45 t/hm2 of desulfurization gypsum and 30 t/hm2 of fly ash(T5),45 t/hm2 of desulfurization gypsum and 45 t/hm2 of fly ash(T6).The control is without amendment(CK).In each treatment,we measured the changes in soil properties and plant growth.[Result]Regardless of the mixture ratios,soil amendment significantly improved physical properties of the soil.Compared with CK,T3 reduced soil bulk density by 7.69%and increased porosity and water-holding capacity of the soil by 9.69%and 18.70%,respectively.The amendments also improved chemical properties of the soil,with T4 reducing the pH in the 0-10 and 10-20 cm of soil layers by 10.51%and 11.66%,alkalinity reduced by 56.76%and 50.27%,respectively.T4 also reduced soluble salt content in the 0-10,10-20 and 20-40 cm of the soil layers by 32.33%,52.55%and 3.04%respectively,compared to CK.Alfalfa grew better in T4 and T1,with its fresh weight increasing by 61.76%and 43.21%,and dry matter by 48.80%and 30.72%,respectively,compared to CK.It was found that overapplication of the conditioners comprised yield,with T6 reducing the fresh and dry matter by 19.69%and 10.24%,respectively,compared to CK.[Conclusion]Amending the alkalinized soil with a mixture of desulfurization gypsum and fly ash at appropriate ratios can improve soil physical properties and reduce soil pH,alkalinity and soluble salt content in the soil,thereby promoting alfalfa growth.For all the treatments we compared,amending the soil with 45 t/hm2 of desulfurization gypsum and 15 t/hm2 of fly ash worked best.
高富东;何俊;李敏;雷梦媛;王燕;王宇;王月琴
宁夏大学 地理科学与规划学院,银川 750021宁夏大学 地理科学与规划学院,银川 750021||中阿旱区特色资源与环境治理国际合作联合实验室,银川 750021||宁夏旱区资源评价与环境调控重点实验室,银川 750021
地理科学
脱硫石膏粉煤灰碱化土壤苜蓿产量
desulfurization gypsumfly ashalkalized soilalfalfayield
《灌溉排水学报》 2024 (004)
59-65 / 7
国家重点研发计划项目(2019YFC1904303,2021YFC3201205)
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