| 用连续流动分析仪测定土壤易矿化有机态氮的研究 |
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| 引用本文： | 王晶,宋建国,林杉.用连续流动分析仪测定土壤易矿化有机态氮的研究[J].中国农业大学学报,1998(Z4). |
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| 作者姓名： | 王晶 宋建国 林杉 |
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| 作者单位： | 中国农业大学植物营养系;中国农业大学植物营养系 北京; |
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| 基金项目： | 国家自然科学基金,批准号 49771052 |
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| 摘 要： | 本文在用 TRAACS2000连续流动分析仪测定土壤中常见氨基酸态氮的基础上,研究了浸提温度、土壤样品处理方法对易矿化有机态氮的影响。结果表明,所测氨基酸态氮的回收率平均达到94%,而通过连续流动分析仪测得浸提液中全氮量占凯氏定氮法所测浸提液中全氮量的84%,二者有极显著相关,从而也间接证明了土壤 CaCl_2浸提液中主要以氨基酸态氮为主;土壤易矿化有机态氮含量随浸提温度提高和浸提时间延长而增加,但底层土壤不如表层土壤对浸提温度提高所增加的幅度大,并且表层土壤易矿化有机态氮含量随样品不同处理变化的顺序为105℃烘干样>40℃烘干样>风干样>鲜样;用连续流动分析仪测定土壤提液不同形态氮素时,可用去离子水作为清洗液代替0.01mol·L~(-1)CaCl_2,以避免 CaCl_2作清洗液产生沉淀而影响测定结果。
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| 关 键 词： | 连续流动分析仪 易矿化有机态氮 浸提温度 氨基酸态氮 |
A Study on Continuous-flow Analysis(CFA)for Determination of Soil Easy Mineralizable Organic Nitrogen |
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| Wang Jing Song Jianguo Lin Shan.A Study on Continuous-flow Analysis(CFA)for Determination of Soil Easy Mineralizable Organic Nitrogen[J].Journal of China Agricultural University,1998(Z4). |
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| Authors: | Wang Jing Song Jianguo Lin Shan |
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| Institution: | Wang Jing Song Jianguo Lin Shan (Dept.of Plant Nutrition CAU,Beijing,100094) |
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| Abstract: | To evaluate the extraction temperature and soil sample preparation on ex- tractable organic nitrogen(N_(org)),a study was conducted based on determination of amino acid existing normaolly in soil extraction.The results demonstrated that the recovery of amino acid nitrogen reatched to a mean value of 94%,and content of extractable total ni- trogen(N_T)determined account for 84% of that determined by the Kjeldahl method,and both were closely correlated,which indirectly indicated the majority of CaCl_2 extract... |
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| Keywords: | continuous-flow analysis(CFA) easy mineralizable organic nitrogen extraction temperature amino acid |
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