长期减量化肥配施紫云英对土壤供钾能力的影响OA
Effects of long-term combined application of reduced chemical fertilizer and Chinese milk vetch on soil potassium supply capacity
为探明长期减量化肥配施紫云英对土壤供钾能力的影响,以 17 年长期定位试验为平台,共设 5 个处理:不施肥(CK)、单施化肥(CF)、80%化肥配施 22.5 t/hm2 紫云英(80%CF+G)、60%化肥配施 22.5 t/hm2 紫云英(60%CF+G)及 40%化肥配施 22.5 t/hm2 紫云英(40%CF+G),研究不同施肥处理对土壤钾素形态、钾吸附位点及钾素释放动力学的影响.结果表明,各处理土壤钾素表观平衡均表现为亏缺,CK处理亏缺最严重,80%CF+G处理亏缺最小.长期减量化肥配施紫云英较CF处理土壤水溶性钾含量提高了 1.07%～11.20%,土壤非交换性钾含量降低了 3.17%～6.91%.各施肥处理土壤点位钾含量及占比表现为i位钾>e位钾>p位钾,长期减量化肥配施紫云英较CF 处理提高了土壤p位钾含量及占比,提高了e位钾占比,降低了i位钾含量及占比.土壤钾的释放过程分为快速释放阶段(0～12 h)和慢速释放阶段(12～96 h);与CK和CF 处理相比,长期减量化肥配施紫云英提高了土壤钾释放动力学幂函数方程及Elovich方程参数a.相关性分析结果显示,p位钾与幂函数方程及Elovich方程参数a和土壤速效钾呈显著正相关;e位钾与土壤水溶性钾和交换性钾呈显著正相关;幂函数方程及Elovich方程参数a 与土壤交换性钾、p位钾及速效钾呈显著正相关.综上,长期减量化肥配施紫云英能提高土壤钾的生物有效性及供应能力,以 80%CF+G处理效果较好.
A 17-year long-term field experiment was conducted to investigate the effects of combining reduced chemical fertilizer with Chinese milk vetch on soil potassium(K)supply capacity.Five fertilization treatments were implemented:no fertilization(CK),chemical fertilizer alone(CF),80%chemical fertilizer combined with 22.5 t/hm2 Chinese milk vetch(80%CF+G),60%chemical fertilizer combined with 22.5 t/hm2 Chinese milk vetch(60%CF+G),and 40%chemical fertilizer combined with 22.5 t/hm2 Chinese milk vetch(40%CF+G).The study evaluated the effects of these treatments on soil K forms,K adsorption sites,and K release kinetics.The results showed that the apparent balance of soil K in all treatments showed a deficit,with the CK treatment having the most severe deficit and the 80%CF+G treatment having the smallest deficit.Compared to CF treatment,long-term combined application of reduced chemical fertilizer with Chinese milk vetch increased soil water-soluble K content by 1.07%to 11.20%and decreased soil non-exchangeable K content by 3.17%to 6.91%.Among K adsorption sites,the content and proportion followed the order:i-sites>e-sites>p-sites.Compared to CF treatment,the combined treatments increased the content and proportion of p-site K and increased the proportion of e-site K,while reducing the content and proportion of i-site K.The K release process consisted of two distinct stages:a rapid release phase(0-12 h)and a slow-release phase(12-96 h).Compared to CK and CF treatments,the combined treatments increased the parameter a in both the power function and Elovich equations used to describe K release kinetics.Correlation analysis indicated that p-site K was significantly positively correlated with parameter a of the power function and Elovich equations and with soil available K.E-site K showed significant positive correlations with soil water-soluble K and exchangeable K.Parameter a from both kinetic models was significantly positively correlated with exchangeable K,p-site K,and available K.In conclusion,long-term combined application of reduced chemical fertilizer and Chinese milk vetch enhances the bioavailability and supply capacity of soil K,with the 80%CF+G treatment showing the best results.
张成兰;吕玉虎;杜光辉;张琳;刘春增;郑春风;张济世;李本银;曹卫东
河南省农业科学院植物营养与资源环境研究所,河南 郑州 450002||河南省农业资源与环境重点实验室,河南 郑州 450002信阳市农业科学院,河南 信阳 464000信阳市农业科学院,河南 信阳 464000信阳市农业科学院,河南 信阳 464000河南省农业科学院植物营养与资源环境研究所,河南 郑州 450002||河南省农业资源与环境重点实验室,河南 郑州 450002河南省农业科学院植物营养与资源环境研究所,河南 郑州 450002||河南省农业资源与环境重点实验室,河南 郑州 450002河南省农业科学院植物营养与资源环境研究所,河南 郑州 450002||河南省农业资源与环境重点实验室,河南 郑州 450002河南省农业科学院植物营养与资源环境研究所,河南 郑州 450002||河南省农业资源与环境重点实验室,河南 郑州 450002中国农业科学院农业资源与农业区划研究所,北京 100081
紫云英钾形态钾吸附点位钾释放动力学
Chinese milk vetchpotassium formspotassium adsorption sitespotassium release kinetics
《中国土壤与肥料》 2026 (8)
36-45,10
河南省农业科学院博士科研启动费项目(2026BX38)河南省科技攻关项目(262102110229)河南省农业科学院基本科研业务费专项(2026ZC53)河南省农业科学院自主创新项目(2025ZC104)2023年郑州市科技局基础研究和应用基础研究专项资金项目.
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