Gravimetric determination of soil organic matter
Gravimetric determination of soil organic matter
复制标题
土壤有机质的重量法测定
DOI：
10.1590/s1516-89132000000500005
复制
发表时间：
2000
影响因子：
1
通讯作者：
A. Silva
中科院分区：
文献类型：
--
作者：
M. Miyazawa;Pavan;E. L. D. Oliveira;M. Ionashiro;A. Silva
本文对300 ℃失重法测定土壤有机质含量进行了研究。重量法进行了比较与Walkley-Black，使用几个巴西土壤变量的化学和物理性质。重量法与Walkley-Black法呈显著正相关，线性回归方程为y = 3.72x + 0.29，r = 0.94。热带土壤的角系数为3.72，大于文献中报道的温带土壤的角系数（从1.68到2.13）。这种差异是由于有机质的氧化程度更大。与Walkley-Black法相比，重量法具有不污染环境、不使用浓硫酸等优点。
Studies were carried out to evaluate a gravimetric method for the determination of soil organic matter by the mass loss at 300oC. The gravimetric method was compared with Walkley-Black, using several brazilian soils with variable chemical and physical properties. Gravimetric method was positively correlated with Walkley-Black method with the following linear regression equation: y = 3.72x + 0.29, r = 0.94. The angular coefficient 3.72 for tropical soils was greater than those reported in the literature for temperate soils (from 1.68 to 2.13). The difference was due to greater oxidation degree of the organic matter. When compared with Walkley-Black method, gravimetric technique showed certain distinct advantages such as no environmental contamination with Cr6+ and improved laboratory safety eliminating the use of concentrated sulfuric acid.