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硫代硫酸铵对土壤剩余尿素量测定的干扰及其结果的校正方法 被引量:2

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摘要 本研究通过硫代硫酸铵对土壤剩余尿素量测定方法的结果的干扰。提出在土壤脲酶抑制剂研究中应引起注意的试验设计和结果校正的方法.研究结果表明,在采用丁二酮—氨基硫脲—磷酸—硫酸为显色剂测定水解剩余尿素量时,硫代硫酸铵对尿索测定有明显的干扰作用。并且此影响随硫代硫酸铵浓度增大而增大.对这种有一定规律的对测定结果的影响,可通过合理的试验设计和计算藉以消除.另外,在长期土壤培养试验中,由于所用脲酶抑制剂会在土壤中发生水解,不同浓度处理对结果产生的影响无法作为系统误差消除.因此有必要增加与各处理相配套的不经5小时恒温培养而直接提取的测定,以便对试验测定结果进行必要的校正.
出处 《土壤学进展》 1995年第5期52-56,共5页
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