CAJ | 학술논문

土壤碳库由有机碳库和无机碳库两大部分组成。选择黑土和潮土两种不同类型土壤,分别通过直接燃烧和催化氧化方法测定土壤总碳含量,以揭示两种方法测定结果的可比性及其差导显著性,每个样品每种方法重复测定5次。结果表明：催化氧化法和直接燃烧法测定的黑土总碳含量平均值分别为(15．10±0．03) g/kg 和(15．38±0．32) g/kg, t检验两种方法的测定结果无明显差异。催化氧化法测定的潮土总碳含量为(15．07±0．06) g/kg,直接燃烧法测定潮土总碳含量为(15．76±0．18) g/kg, t检验结果差异明显。两种仪器土壤总碳测定结果精密度均较高,相对偏差均小于5%。为采用仪器方法测定土壤总碳含量及土壤碳库量变化提供参考。
토양탄고유유궤탄고화무궤탄고량대부분조성。선택흑토화조토량충불동류형토양,분별통과직접연소화최화양화방법측정토양총탄함량,이게시량충방법측정결과적가비성급기차도현저성,매개양품매충방법중복측정5차。결과표명：최화양화법화직접연소법측정적흑토총탄함량평균치분별위(15．10±0．03) g/kg 화(15．38±0．32) g/kg, t검험량충방법적측정결과무명현차이。최화양화법측정적조토총탄함량위(15．07±0．06) g/kg,직접연소법측정조토총탄함량위(15．76±0．18) g/kg, t검험결과차이명현。량충의기토양총탄측정결과정밀도균교고,상대편차균소우5%。위채용의기방법측정토양총탄함량급토양탄고량변화제공삼고。
Soil Carbon ( C) exists in both organic and inorganic forms. We compared the results of soil C values obtained by direct combustion method and catalytic combustions method. The black soil from Heilongjiang province in Northeast China and the calcareous fluvo-aquic soil from Shandong province in North China Plain were selected. The results showed that the C con-tents of black soil samples measured by the catalytic oxidation and the direct combustion method were (15. 10 ± 0. 03) g/kg and (15. 38 ± 0. 32) g/kg, respectively, with no significant difference according to t test. The C contents of fluvo-aquic soil samples were (15. 07 ± 0. 06) g /kg through catalytic oxidation method and (15. 76 ± 0. 18) g /kg by the direct com-bustion method and presented significant difference by t test. Both methods for soil C measurement had a high precision with relative standard deviation ( RSD) less than 5%. Compared with the catalytic oxidation method, the direct combustion meas-urement showed slightly higher levels of the standard deviation and the measurement uncertainty.