Fig 3. The correlation of thermal stability (calculated as ratio of the measured ion intensities ≥410°C proportional to the total ion intensity (in 10⁶ counts mg^-1) of the sample and expressed as percentage (%)) with the ratio of microbial versus plant-derived carbohydrates (H:P, hexose:pentose ratio) of microaggregate size fraction of the topsoil samples.

The level of significance is given by superscript asterisks: *P < 0.05.