东北芦苇湿地土壤有效硅与pH值及物质组成的关系

天津农业科学inAgriculturalSciences2014，20(5)：一7口·土壤肥料与节水灌溉东北芦苇湿地土壤有效硅与pH值及物质组成的关系史吉晨，介冬梅1,2,3，李思琪，王嫒林，牛莉平，卢美娇(1．东北师范大学地理科学学院，吉林长春130000；2．国家环境保护湿地生态与植被重点实验室，吉林长春130024；3．东北师范大学草地研究所植被生态科学教育部重点实验室，吉林长春130024)摘要：为探究土壤有效硅与土壤pH值及物质组成的关系，在东北地区选12个样点，采集1195个土壤样品，运用硅钼蓝比色法进行有效硅含量测定，用重铬酸钾一硫酸溶液对有机质进行测定，用pH计对酸碱度进行测定，运用ICP法进行阳离子测定。研究结果表明：在湿润地区土壤pH值与有效硅为正相关，在半湿润半干旱地区，pH值与有效硅为负相关；有机质在湿润地区和雨季时间段与有效硅呈现正相关，在半干旱地区与有效硅为负相关，但关系复杂并非简单线性相关关系；钾钠比与有效硅正相关，而钙镁比与有效硅负相关。关键词：土壤有效硅；有机质；pH值；东北地区中图分类号：D564+．2文献标识码：ADOI编码：10．3969~．issn．1006—6500．2014．05．14RelationshipBetweentheAvailableSiliconoftheSoilandpHandMaterialCompositionoftheSoilintheReedWetlandinNortheastAreaofChinaSHIJi—chen，JIEDong—mei，'；LISi-qi．WANGAi-lin，NIULi-ping1,LUMei-jiao【1．SchoolofGeographicalScience，NortheastNormalUniversity，Changchun，Jilin130000，China；2．StateEnvironmentalProtectionKeyLaboratoryofWetlandEcologyandVegetationRestoration，Changchun，Jinlin130024，China；3．InstituteofGrasslandScience，NortheastNormalUniversity，KeyLaboratoryforVegetableEcologyMinistryofEducation，Changchun，Jilin130024，China)Abstract：In12sitesofnortheastern．1195soi1sampleswerecollectedfortheresearchonrelationshipbetweentheavailablesili—conofthesoilandpHandmaterialcompositionofthesoil．Theavailablesiliconcontentwasdeterminedbyusingsiliconmolybde—Bumbluespectrophotometer．ThesoilcationwasdeterminedbyICPmethod，andpHwasdeterminedbyPHmeter．TheresultshowedthattherewasapositivecorrelationbetweenpHandtheavailablesiliconofthesoilinhumidarea．TherewasanegativecorrelationbetweenpHandtheavailablesiliconofthesoilinthedryarea．Inthehumidareaduringtherainyseason，organicmat—terhadapositivecorelationtotheavailablesilicon．Ontheotherhand，organicmatterhadanegativecorrelationtotheavailablesiliconinthesemiaridzone，buttherelationwascomplexandtheydonothaveasimplelinearrelationship．TherewasapositivecorrelationbetweentheradioofKandNaandanegativecorelationbetweentheradioofCaandMg．Keywords：theavailablesiliconofthesoil；organicmatter；pH；thenortheastarea硅是地壳中含量第2的元素，是绝大多数植物的矿质基质⋯。硅素不仅是禾本科植物必需的营养元素