CAJ | 학술논문

土壤全氮含量反映土壤中氮循环的状况,是评价土壤肥力与土壤资源的一项重要指标。选择黑土和潮土,分别利用元素分析仪(杜马斯催化燃烧法)和全自动凯氏定氮仪(凯氏消煮蒸馏法)测定土壤全氮含量,以揭示两种仪器测定结果的可比性,每个样品每种方法重复测定5次。结果表明：元素分析仪和全自动凯氏定氮仪测定的黑土全氮含量(平均值±标准偏差)分别为(1．37±0．01) g/ kg 和(1．36±0．01) g/ kg,潮土全氮含量分别为(0．75±0．02) g/ kg 和(0．78±0．03) g/ kg, t 检测表明,两种仪器测定结果之间无显著性差异。两种仪器土壤全氮测定结果精确度均较高,稳定性较好,相对标准偏差均小于5%。本研究结果可为采用仪器方法测定土壤全氮含量及评价土壤氮库变化提供参考。
토양전담함량반영토양중담순배적상황,시평개토양비력여토양자원적일항중요지표。선택흑토화조토,분별이용원소분석의(두마사최화연소법)화전자동개씨정담의(개씨소자증류법)측정토양전담함량,이게시량충의기측정결과적가비성,매개양품매충방법중복측정5차。결과표명：원소분석의화전자동개씨정담의측정적흑토전담함량(평균치±표준편차)분별위(1．37±0．01) g/ kg 화(1．36±0．01) g/ kg,조토전담함량분별위(0．75±0．02) g/ kg 화(0．78±0．03) g/ kg, t 검측표명,량충의기측정결과지간무현저성차이。량충의기토양전담측정결과정학도균교고,은정성교호,상대표준편차균소우5%。본연구결과가위채용의기방법측정토양전담함량급평개토양담고변화제공삼고。
Nitrogen (N) is one of the most important elements for plant nutrition. It is necessary to apply reliable methods for N determination in soils. Among the different methods of total N determination in soils, the Kjeldahl method (wet oxidation) and the elemental analyzer (Dumas dry combustion method) are more frequently used. In this study, black soil was sampled from Heilongjiang provinces in Northeast China and calcareous fluvo-aquic soil sample was from Shandong provinces in North China Plain. The objective of this study was to compare soil total N contents determined by a CNS elemental analyzer (vario PYRO cube, Elementar Analysensysteme GmbH) and an automated Kjeldahl N determination instrument (BüCHI Labortech-nik AG). The results showed that total N contents of black soil samples measured by the elemental analyzer and the automated micro-Kjeldahl method were (1. 37 ± 0. 01) g/ kg and (1. 36 ± 0. 01) g/ kg (mean ± SD), respectively. The N contents of fluvo-aquic soil samples were (0. 75 ± 0. 02) g/ kg through the elemental analyzer method and (0. 78 ± 0. 03) g/ kg by the automated Kjeldahl method. The t test found there was no significant difference of soil N measured by two kinds of instruments. Both methods for soil N measurement had a high precision with relative standard deviation (RSD) less than 5% .