Table 1.
Standard emission factor Es (μg C g-1 h-1) with 95% confidence interval and empirical temperature coefficient β (°C-1) with 95% confidence interval for Quercus suber (A) and Cistus ladanifer (B).
| (A) | ||||||
|---|---|---|---|---|---|---|
| Compound | Es | β | Es | β | Es | β |
| Quercus suber | June (n = 18) | July (n = 32) | August (n = 32) | |||
| Total terpenoids | 0.543 ± 0.208 | -0.062 ± 0.038 | 0.224 ± 0.043 | -0.021 ± 0.015 | 0.245 ± 0.047 | -0.033 ± 0.023 |
| Monoterpenes | 0.456 ± 0.202 | -0.068 ± 0.043 | 0.186 ± 0.039 | -0.038 ± 0.016 | 0.216 ± 0.042 | -0.036 ± 0.023 |
| Oxy. Monoterpenes | 0.053 ± 0.032 | -0.047 ± 0.058 | 0.026 ± 0.009 | 0.035 ± 0.027 | 0.025 ± 0.007 | -0.007 ± 0.031 |
| Sesquiterpenes | 5.32 × 10-4 ± 4.29 × 10-4 | 0.139 ± 0.077 | 2.56 × 10-4± 1.17 × 10-4 | 0.168 ± 0.036 | 3.53 × 10-5 ± 2.76 × 10-5 | 0.164 ± 0.091 |
| Limonene | 0.159 ± 0.109 | -0.005 ± 0.067 | 0.077 ± 0.038 | -0.059 ± 0.038 | 0.043 ± 0.026 | -0.092 ± 0.071 |
| α-Pinene | 0.039 ± 0.043 | -0.149 ± 0.107 | 0.022 ± 0.008 | -0.084 ± 0.027 | 0.024 ± 0.008 | -0.001 ± 0.040 |
| β-Pinene | 0.036 ± 0.033 | -0.131 ± 0.091 | 0.012 ± 0.005 | -0.068 ± 0.032 | 0.012 ± 0.004 | -0.048 ± 0.043 |
| γ-Terpinene | 0.017 ± 0.014 | -0.121 ± 0.077 | 0.007 ± 0.003 | -0.030 ± 0.030 | 0.025 ± 0.008 | -0.043 ± 0.038 |
| Sabinene | 0.031 ± 0.033 | -0.151 ± 0.103 | 0.005 ± 0.003 | -0.053 ± 0.041 | 0.005 ± 0.002 | 0.003 ± 0.053 |
| (B) | ||||||
| Cistus ladanifer | June (n = 9) | July (n = 16) | August (n = 16) | |||
| Total terpenoids | 1.027 ± 0.345 | 0.064 ± 0.033 | 0.590 ± 0.119 | 0.099 ± 0.017 | 0.298 ± 0.109 | 0.097 ± 0.043 |
| Monoterpenes | 0.630 ± 0.270 | 0.053 ± 0.042 | 0.428 ± 0.098 | 0.089 ± 0.019 | 0.223 ± 0.084 | 0.087 ± 0.044 |
| Oxy. Monoterpenes | 0.181 ± 0.051 | 0.038 ± 0.027 | 0.092 ± 0.015 | 0.092 ± 0.014 | 0.057 ± 0.021 | 0.111 ± 0.042 |
| Sesquiterpenes | 0.200 ± 0.060 | 0.111 ± 0.029 | 0.063 ± 0.015 | 0.149 ± 0.020 | 0.014 ± 0.005 | 0.201 ± 0.037 |
| Diterpenes | 4.98 × 10-5 ± 3.34 × 10-5 | 0.116 ± 0.066 | 6.04 × 10-5 ± 1.09 × 10-5 | 0.084 ± 0.015 | 5.98 × 10-5 ± 2.29 × 10-5 | 0.135 ± 0.045 |
| γ-Terpinene | 0.208 ± 0.129 | 0.053 ± 0.060 | 0.135 ± 0.032 | 0.096 ± 0.020 | 0.068 ± 0.028 | 0.121 ± 0.047 |
| α-Pinene | 0.150 ± 0.041 | 0.043 ± 0.027 | 0.125 ± 0.032 | 0.074 ± 0.022 | 0.051 ± 0.017 | 0.057 ± 0.040 |
| Limonene | 0.033 ± 0.021 | 0.082 ± 0.061 | 0.046 ± 0.010 | 0.086 ± 0.019 | 0.024 ± 0.008 | 0.074 ± 0.041 |
| 2,6-dimethyl-5-hepten-1-ol | 0.049 ± 0.022 | 0.032 ± 0.043 | 0.032 ± 0.009 | 0.059 ± 0.024 | 0.018 ± 0.007 | 0.125 ± 0.048 |
| α-Terpinene | 0.047 ± 0.044 | 0.039 ± 0.090 | 0.029 ± 0.008 | 0.093 ± 0.022 | 0.015 ± 0.004 | 0.140 ± 0.034 |
| Manoyl oxide | 1.32 × 10-5 ± 7.64 × 10-6 | 0.122 ± 0.056 | 1.83 × 10-5 ± 4.25 × 10-6 | 0.108 ± 0.020 | 2.14 × 10-5 ± 8.25 × 10-6 | 0.139 ± 0.045 |
| Cembrene | 2.28 × 10-5 ± 1.80 × 10-5 | 0.124 ± 0.076 | 1.21 × 10-5 ± 4.40 × 10-6 | 0.103 ± 0.031 | 1.13 × 10-5 ± 7.17 × 10-6 | 0.131 ± 0.075 |
| Verticillol | 3.23 × 10-6 ± 3.03 × 10-6 | 0.079 ± 0.093 | 2.20 × 10-5 ± 5.49 × 10-6 | 0.063 ± 0.021 | 1.64 × 10-5 ± 7.69 × 10-6 | 0.130 ± 0.055 |
| Ent-16-kaurene | 3.13 × 10-6 ± 4.60 × 10-6 | 0.089 ± 0.142 | 3.31 × 10-6 ± 8.33 × 10-7 | 0.066 ± 0.021 | 2.84 × 10-6 ± 1.16 × 10-6 | 0.119 ± 0.048 |
Es and β were calculated according to Guenther et al. (1993) (see equation 2), where Es is the y-intercept and β the slope of the regression. For Q. suber the different terpenoid compound groups and the five terpenoid compounds with the highest emission rates are displayed, for C. ladanifer single diterpene compounds are additionally displayed.