Table 2.
Free pool sizes and mean residence times of amino compounds in six soils differing in bedrock and land management (G, Gumpenstein; M, Moarhof; A, arable; P, pasture; F, forest). Values are means ± SE (n = 4). Significance was tested by two-way ANOVA for effects of bedrock (B) and land management (M) as well as their interaction. ns: not significant.
| Soil Type | GA | GP | GF | MA | MP | MF | p value | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Bedrock | Silicate | Limestone | B | M | BxM | |||||
| Management | Arable | Pasture | Forest | Arable | Pasture | Forest | ||||
| Free pool size (ng N g−1 d.w.) | Glucosamine | 36.5 ± 2.0 | 208 ± 32 | 143 ± 37 | 27.7 ± 0.9 | 126.9 ± 12.3 | 94.8 ± 12.6 | ** | *** | ns |
| Muramic acid | 0.15 ± 0.02 | 0.53 ± 0.07 | 0.45 ± 0.11 | 1.53 ± 0.14 | 1.26 ± 0.30 | 1.21 ± 0.05 | *** | ns | ns | |
| mDAP | 32.5 ± 1.4 | 89.4 ± 13.8 | 84.3 ± 22.5 | 53.3 ± 4.5 | 211 ± 14 | 175 ± 29 | *** | *** | *** | |
| l-alanine | 11.2 ± 3.3 | 8.9 ± 0.7 | 17.3 ± 6.3 | 68.8 ± 3.9 | 47.8 ± 16 | 42.4 ± 5.2 | *** | ns | ns | |
| d-alanine | 2.91 ± 0.10 | 2.83 ± 0.33 | 1.99 ± 0.32 | 2.85 ± 0.22 | 2.47 ± 0.32 | 2.91 ± 0.31 | ns | ns | ns | |
| MRT (hour) | Glucosamine | 1.3 ± 0.1 | 2.0 ± 0.1 | 1.9 ± 0.3 | 1.4 ± 0.1 | 5.4 ± 1.3 | 4.7 ± 0.4 | *** | ** | * |
| Muramic acid | 23.8 ± 10 | 41.0 ± 34.6 | 108 ± 26 | 94.9 ± 88.5 | 3.7 ± 0.5 | 140 ± 77 | ns | ns | ns | |
| mDAP | 10.6 ± 1.4 | 21.8 ± 7.4 | 76.9 ± 5.2 | 25.4 ± 6.6 | 10.0 ± 0.7 | 3.8 ± 0.7 | *** | *** | *** | |
| l-alanine | 0.8 ± 0.1 | 1.2 ± 0.4 | 0.7 ± 0.0 | 3.6 ± 0.3 | 3.3 ± 1.4 | 1.7 ± 0.3 | *** | ns | ns | |
| d-alanine | 1.5 ± 0.5 | 9.3 ± 3.7 | 0.7 ± 0.1 | 3.5 ± 1.1 | 3.2 ± 1.3 | 2.5 ± 0.8 | ** | ** | ** | |