摘要
【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/hm^(2)、粉煤灰15 t/hm^(2))、T2(脱硫石膏30 t/hm^(2)、粉煤灰30 t/hm^(2))、T3(脱硫石膏30 t/hm^(2)、粉煤灰45 t/hm^(2))、T4(脱硫石膏45 t/hm^(2)、粉煤灰15 t/hm^(2))、T5(脱硫石膏45 t/hm^(2)、粉煤灰30 t/hm^(2))、T6(脱硫石膏45 t/hm^(2)、粉煤灰45 t/hm^(2))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/hm^(2)脱硫石膏与15 t/hm^(2)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/hm^(2)of desulfurization gypsum and 15 t/hm^(2)of fly ash(T1),30 t/hm^(2)of desulfurization gypsum and 30 t/hm^(2)of fly ash(T2),30 t/hm^(2)of desulfurization gypsum and 45 t/hm^(2)of fly ash(T3),45 t/hm^(2)of desulfurization gypsum and 15 t/hm^(2)of fly ash(T4),45 t/hm^(2)of desulfurization gypsum and 30 t/hm^(2)of fly ash(T5),45 t/hm^(2)of desulfurization gypsum and 45 t/hm^(2)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
作者
高富东
何俊
李敏
雷梦媛
王燕
王宇
王月琴
GAO Fudong;HE Jun;LI Min;LEI Mengyuan;WANG Yan;WANG Yu;WANG Yueqin(School of Geography and Planning,Ningxia University,Yinchuan 750021,China;China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Regions,Yinchuan 750021,China;Key Laboratory of Resource Evaluation and Environmental Regulation in Arid Region of Ningxia,Yinchuan 750021,China)
出处
《灌溉排水学报》
CAS
CSCD
2024年第4期59-65,共7页
Journal of Irrigation and Drainage
基金
国家重点研发计划项目(2019YFC1904303,2021YFC3201205)。
关键词
脱硫石膏
粉煤灰
碱化土壤
苜蓿
产量
desulfurization gypsum
fly ash
alkalized soil
alfalfa
yield
