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不同施肥结构对酸性冲积菜园土的酸性与交换性能的修复效应.pdf

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呻国虐学(墨提 2013,29(32):274—279 ChineseAgriculturalScienceBulletin 不同施肥结构对酸性冲积菜园土的 酸性与交换性能的修复效应 雷 盼,张杨珠,黄运湘,廖超林,杨甲华,和利钊 (湖南农业大学资源环境学院,长沙410128) 摘 要:为了减少土壤对农业造成的损失以及给生态环境带来的恶化,为保证湖南农业的可持续发展和 生态环境保护提供科学依据,以长沙市东郊浏阳河沉积物发育的冲积菜园土为研究对象,通过田间小区 试验和动态取样与室内测定,研究了不同施肥结构对菜园土酸性、交换性能的改良效应。结果表明:单 纯施用化学肥料处理(NPK)能明显降低土壤pH,施用石灰质物质处理(NPK+MgO和NPK+CaO)能有效 降低表层土酸酸度;交换性铝离子只有在较低酸度的土壤中出现;耕层土壤CEC值相对比较稳定,试验 土壤CEC值在8~lO.75cmol/l(g之间,平均值为9.05cmolg。供试土壤的保肥和酸化缓冲能力比较弱。 关键词:菜园土;土壤酸化;CEC;交换性酸 中图分类号:S158 文献标志码 :A 论文编号:2012—2485 TheStudyonRemedialEffectofSeveralFertilizationStructureson AcidicVegetableSoilfrom RiverDeposit LeiPan,ZhangYangzhu,HuangYunxiang,LiaoChaolin,YangJiahua,HeLizhao (CollegeofResourcesandEnvironment,HunanAgriculturalUniversity,Changsha410128) Abstract:Inordertoreducethelosscausedbysoilforagricultureandecologicalenvironmentdeterioration,to guaranteethesustainabledevelopmentofagricultureinHunanandprovidescientificbasisofrtheecological environmentprotection.A fieldexperimentandlaboratoryanalysiswereperformedtostudyacidcharacteristics ingardensoilinthesuburbofChangshaCity.Theresultsshowedthat:onlyapplyingchemicalfertilizerscould significantlyreducesoilpH andpromotesoilacidification.ApplyingMgOandCaOtreatmentscouldeffectively reducetheacidofsurface soil,buttheeffecton theimprovementofthebottom soilacidwasnotobvious. ExchangeableacidandpH valuehadan inverserelationship,andonlyattheloweracidity,exchangeable aluminum ionscouldbeappearedinsoil.TopsoilCECvalueswererelativelystable,andsoilCECrangedfrom 8to10.75emoYkgwithanaverageof9.05cmol/kg.Thepreserving-fertilityandacid—basebufferingcapacity inthetestedsoilwasweak. Keywords:vegetablesoil;soilacidification;CEC;exchangeableacid
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