Table 2.
Retention time and peak areas (%) of identified soil chemical compounds, indicating relative abundances across treatments.
| Category | ID | Retention time | Kovats index | Name | Peak areas (%) |
|||
|---|---|---|---|---|---|---|---|---|
| CK | T | M | TM | |||||
| Alkanes | GC4 | 12.069 | 1140.74 | Hexadecane | 0.159a | 0.110ab | 0.005b | 0.196a |
| GC8 | 12.872 | 1167.82 | Undecane, 2,6-dimethyl | 0.577ab | 0.499ab | 0.337b | 0.687a | |
| GC9 | 13.343 | 1183.71 | 9-Methyl heptadecane | 0.711a | 0.659a | 0.110b | 0.588ab | |
| GC11 | 14.593 | 1226.59 | 2,6,10-Trimethyl decane | 1.021a | 0.422b | 0.143b | 1.116a | |
| GC13 | 14.997 | 1240.59 | N-Hentriacontane | 0.040b | 0.235ab | 0.370a | 0.000b | |
| GC17 | 15.88 | 1271.20 | 9-Methyl heptadecane | 0.773ab | 0.628ab | 0.362b | 0.834a | |
| GC26 | 17.941 | 1346.17 | N-Hentriacontane | 0.395ab | 0.107b | 0.488a | 0.566a | |
| GC29 | 18.449 | 1365.24 | 9-Methyl heptadecane | 0.537a | 0.115ab | 0.000b | 0.382ab | |
| GC36 | 19.725 | 1414.38 | Heptadecane | 1.155a | 0.350ab | 0.245b | 0.998ab | |
| GC45 | 21.22 | 1470.74 | Heptadecane,2,6,10,14-tetramethyl | 0.402b | 0.665ab | 0.961a | 0.696ab | |
| GC47 | 21.473 | 1480.44 | Tetradecane, 3-methyl | 0.520ab | 0.245b | 0.607a | 0.288ab | |
| GC52 | 23.034 | 1544.93 | Tetratetracontane | 0.000b | 0.087ab | 0.183a | 0.077b | |
| GC57 | 23.895 | 1581.74 | Pentadecane, 3-methyl | 0.042ab | 0.035ab | 0.112a | 0.000b | |
| GC61 | 26.934 | 1716.38 | Hexadecane,2,6,10,14-tetramethyl- | 0.000b | 0.027a | 0.000b | 0.000b | |
| GC64 | 27.785 | 1754.78 | N-Hentriacontane | 0.062a | 0.008b | 0.000b | 0.000b | |
| GC96 | 46.06 | 2715.65 | 1-Hexacosene | 0.000b | 0.073b | 0.039b | 0.252a | |
| GC99 | 47.375 | – | (E,E,E,E)-Squalene | 0.000b | 0.199a | 0.039ab | 0.067ab | |
| Arenes | GC25 | 17.703 | 1311.97 | Naphthalene,1,2,3,4-tetrahydro-1,8-dimethyl | 0.000b | 0.173a | 0.000b | 0.000b |
| Alcohols | GC72 | 34.62 | 2100.11 | 1-Heptadecanol | 0.221b | 0.000b | 0.000b | 0.695a |
| GC78 | 36.816 | 2227.94 | 1-Nonadecanol,1-acetate | 1.407a | 0.415b | 1.584a | 1.450a | |
| GC97 | 46.489 | 2753.58 | Beta-Sitosterol | 0.179b | 0.867a | 0.834a | 0.781a | |
| Esters | GC42 | 20.921 | 1459.28 | Isobutyl tetradecyl carbonate | 0.424b | 0.634ab | 0.920a | 0.774ab |
| GC67 | 32.044 | 1964.22 | Dibutyl phthalate | 0.000b | 0.267a | 0.263a | 0.154ab | |
| GC71 | 34.615 | 2099.84 | 13-Tetradecen-1-ol-acetate | 0.185b | 0.906a | 0.686ab | 0.335ab | |
| GC87 | 40.272 | 2421.00 | 2,2′-Methylenebis | 0.000b | 3.966a | 5.507a | 4.740a | |
| GC94 | 42.962 | 2539.88 | Dioctyl phthalate | 0.576ab | 0.577ab | 0.093b | 1.132a | |
| Acids | GC76 | 36.074 | 2180.31 | Stearic acid | 0.329b | 0.000b | 1.499a | 0.000b |
| Amines | GC85 | 39.331 | 2375.05 | Oleamide | 0.000b | 1.051a | 0.000b | 0.408ab |
| Phenols | GC92 | 41.56 | 2483.20 | 2,4-bis(1-phenylethyl)phenol | 0.000c | 0.670a | 0.485ab | 0.294bc |
ID indicates the identifying number of each soil chemical compound via GC-MS, and peak area (%) represents the mean relative abundance value of three replicates. CK: no Trichoderma-inoculation and not mowed; T: Trichoderma-inoculation and not mowed; M: mowed and no Trichoderma-inoculation; TM: mowed and Trichoderma-inoculated. Within a row, values that do not share a letter are significantly different (P < 0.05) according to Duncan’s test.