氮肥和锰肥对潮土中锰化学形态的影响

Effects of Nitrogen and Manganese Fertilizer on Chemical Forms of Manganese in Fluvo-aquic Soil

采用连续浸提法研究潮土中锰的化学形态,结果表明,锰在土壤中主要以残留态存在,各种化学形态锰的含量依次为易还原态锰>难溶态锰>交换态锰;不同质地的潮土中,各种化学形态锰的含量为粘质潮土>壤质潮土>砂质潮土;加入外源铵离子会使土壤中交换态锰的含量降低,使易还原态锰含量有所提高;加入适当外源锰后,锰很快会从有效性较大的交换态向有效性相对较低的易还原态转化。

A new sequentialextraction method wasused to analyze the chemicalforms ofmanganese in fluvo aquic soil,the results were shown that in different texture offluvo aquic soil,the order ofthe contentofvarious chemicalforms ofmanganese was clay fluvo aquic soil>loamy fluvo aquic soil>sandy fluvo aquic soil;Manganese existed mainly in residualform in soil,theorderofmanganesecontentofdifferentchemicalform waseasily reduced form>difficultly soluble form >exchangeable form.After NH+ 4was added to soil,the contents of exchangeable form of manganese decreased,but the contents of manganese of easily reduced form increased.When manganese wasadded to soil,thecontentsofexchangeableform ofmanganese remarkably decreased,ittransformed largely and rapidly to easily reduced form.