Table 1.
Composition of four different artificial exudate cocktails (LOW, HIGH, CARBON, NITROGEN), the total concentration of different sugars, organic acids, or amino acids added each time, the amount of C [μg C g−1 soil] and N [μg N g−1 soil] added each time, the C:N of each addition, and the total amount of C [g C g−1 soil] and N [g N g−1 soil] added over the whole experiment
| Exudate diversity levels | LOW | Total concentration of … added each time | Sugars | 40 mmol L−1 | Organic acids | 20 mmol L−1 | Amino acids | 10 mmol L−1 | ||||
| Compounds | Glucose | Sucrose | Acetic acid | Succinic acid | Alanine | Glutamic | Glycine | |||||
| C added each time [μg C g−1 soil] | 710.6 | |||||||||||
| N added each time [μg N g−1 soil] | 23.3 | |||||||||||
| C:N added each time | 30.5 | |||||||||||
| Total C added [g C g−1 soil] | 2.56 | |||||||||||
| Total N added [g N g−1 soil] | 0.08 | |||||||||||
| HIGH | Total concentration of … added each time | Sugars | 40 mmol L−1 | Organic acids | 20 mmol L−1 | Amino acids | 10 mmol L−1 | |||||
| Compounds | Glucose | Fructose | Acetic acid | Citric acid | Lactic acid | Alanine | Arginine | Asparagine | Glutamic | |||
| Sucrose | Maltose | Fumaric acid | Malic acid | Succinic acid | Glycine | Histidine | Leucine | Tyrosine | ||||
| C added each time [μg C g−1 soil] | 732.4 | |||||||||||
| N added each time [μg N g−1 soil] | 30.6 | |||||||||||
| C:N added each time | 23.9 | |||||||||||
| Total C added [g C g−1 soil] | 2.64 | |||||||||||
| Total N added [g N g−1 soil] | 0.11 | |||||||||||
| Nutrient‐enriched levels | CARBON | Total concentration of … added each time | Sugars | 40 mmol L−1 | Organic acids | 20 mmol L−1 | Amino acids | 10 mmol L−1 | ||||
| Compounds | Glucose | Fructose | Citric acid | Malic acid | Succinic acid | Leucine | Tyrosine | |||||
| Sucrose | Maltose | |||||||||||
| C added each time [μg C g−1 soil] | 685.4 | |||||||||||
| N added each time [μg N g−1 soil] | 11.6 | |||||||||||
| C:N added each time | 58.8 | |||||||||||
| Total C added [g C g−1 soil] | 2.47 | |||||||||||
| Total N added [g N g−1 soil] | 0.04 | |||||||||||
| NITROGEN | Total concentration of … added each time | Sugars | 10 mmol L−1 | Organic acids | 20 mmol L−1 | Amino acids | 40 mmol L−1 | |||||
| Compounds | Glucose | Fructose | Acetic acid | Lactic acid | Arginine | Asparagine | Glutamic | Histidine | ||||
| C added each time [μg C g−1 soil] | 480.4 | |||||||||||
| N added each time [μg N g−1 soil] | 175.1 | |||||||||||
| C:N added each time | 2.7 | |||||||||||
| Total C added [g C g−1 soil] | 1.73 | |||||||||||
| Total N added [g N g−1 soil] | 0.63 |