Recovery rate of organic C in organic matter fractions of Grantsburg soils
Recovery rate of organic C in organic matter fractions of Grantsburg soils
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DOI：
10.1080/00103620009370493
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发表时间：
2000-01-01
影响因子：
1.8
通讯作者：
Olson, KR
中科院分区：
文献类型：
--
作者：
Hussain, I;Olson, KR
Walkley-Black法是一种简便、快速的有机碳分析方法。由于有机碳（C）的不完全氧化，用该方法有机C的回收率低。假设采用Walkley-Black方法的有机C回收率为77%，则采用校正因子1.30对结果进行校正。本研究的目的是确定土壤有机C的回收率和适当的校正因子Walkley-Black（湿燃烧）方法在伊利诺伊州南部耕作土壤。土壤样品收集于1995年和1996年从试验中建立在伊利诺伊州南部的排水良好，Grantsburg（细粉质，混合，中质Oxyaquic Fragiudalf）土壤。在不同耕作制度（免耕、凿犁和铧式犁）、土壤有机质组分（全土和矿物组分）和土壤深度（0-5和5-15 cm）下，Leco分析仪（干燃烧）的有机C含量显著高于Walkley-Black方法。有机碳的回收率低于Walkley-Black法假定的回收率。有机碳的回收率没有显着差异，发现由于耕作制度和深度的差异，而回收率较低的矿物级相比，整个土壤。较低的有机碳回收率是由于矿物级分中更稳定的有机碳化合物。在此基础上，提出了修正系数为1.35和1.41的全土和矿物有机碳分析与Walkley-Black方法，分别为耕作的Grantsburg和其他类似的土壤在伊利诺伊州南部。
Walkley-Black method is a simple and rapid method for organic carbon analysis. Because of incomplete oxidation of organic carbon (C), the recovery of organic C is low with this method. Assuming the 77% recovery of organic C with Walkley-Black method, the results are corrected with a correction factor of 1.30. The objective of this study is to determine the soil organic C recovery rate and appropriate correction factor for Walkley-Black (wet combustion) method for tilled soils in southern Illinois. Soil samples were collected in 1995 and 1996 from a trial established in southern Illinois on a moderately well drained, Grantsburg (fine-silty, mixed, mesic Oxyaquic Fragiudalf) soil. Organic C contents with the Leco analyzer (dry combustion) were significantly higher as compared to the Walkley-Black method in different tillage systems (no-till, chisel plow and moldboard plow), soil organic matter fractions (whole soil and mineral fraction) and soil depths (0-5 and 5-15 cm). The recovery percentage of organic C was lower than the assumed percentage with the Walkley-Black method. No significant differences in organic C recovery percentage were found due to differences in tillage systems and depths, whereas the recovery percentage was lower in mineral fraction as compared to the whole soil. The lower organic C recovery percentage was due to the more stable organic C compounds in the mineral fraction. On the basis of these findings, correction factors of 1.35 and 1.41 are proposed for whole soil and mineral organic C analysis with Walkley-Black method, respectively for tilled Grantsburg and other similar soils in southern Illinois.