Table III
Mean climatic characteristics of SNFI plots used to fit the model, classified according to biogeoclimatic strata (Elena Roselló, 1997).
| Stratum | |||||||
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| 1 | 2 | 3 | 4 | 5 | 6 | All | |
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| Number of plots/trees | 36/760 | 20/291 | 143/3053 | 12/261 | 5/85 | 3/55 | 219/4505 |
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| Altitude (m) | 1028.46 | 1017.3 | 1136.9 | 938.6 | 1189.8 | 626.8 | 1094.1 |
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| P annual (mm) | 912.7 | 731.6 | 1026.4 | 1207.6 | 589.7 | 1271.6 | 993.4 |
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| P winter (mm) | 283.1 | 225.7 | 346.3 | 419.1 | 144.4 | 439.8 | 329.4 |
| P spring (mm) | 264.6 | 204.6 | 283.4 | 312.3 | 172.4 | 362.2 | 275.7 |
| P summer (mm) | 114.4 | 107.5 | 104.0 | 147.0 | 124.9 | 60.4 | 108.4 |
| P autumn (mm) | 250.5 | 194.0 | 292.5 | 329.0 | 148.2 | 409.4 | 279.9 |
| T annual (°C) | 10.5 | 9.9 | 9.8 | 9.5 | 9.9 | 14.3 | 10.0 |
| T winter (°C) | 3.5 | 2.6 | 2.6 | 3.5 | 2.7 | 6.4 | 2.9 |
| T summer (°C) | 18.2 | 17.7 | 17.7 | 15.9 | 17.8 | 23.2 | 17.7 |
| T max (°C) | 27.1 | 27.1 | 27.1 | 23.7 | 26.9 | 33.8 | 26.9 |
| T min (°C) | –0.9 | –2.2 | –2.1 | –0.9 | –1.7 | 1.3 | –1.8 |
| Fluctuation (°C) | 27.7 | 29.3 | 29.2 | 24.7 | 28.6 | 31.5 | 28.8 |
| ETP (mm) | 647.4 | 632.0 | 629.1 | 616.53 | 629.9 | 780.8 | 633.5 |
| Surplus (mm) | 509.1 | 350.1 | 637.9 | 753.3 | 195.2 | 866.6 | 598.7 |
| Deficit (mm) | 243.9 | 249.4 | 240.7 | 162.4 | 235.0 | 375.5 | 238.8 |
| Drought period (month) | 1.1 | 1.6 | 1.6 | 0.5 | 1.5 | 2.6 | 1.5 |
P = annual and seasonal (spring, summer, autumn and winter) rainfall (mm), T = average annual and seasonal (summer and winter) temperature (°C), T max = hottest month average maximum temperature (°C), T min = coldest month average minimum temperature (°C), Fluctuation = difference between hottest month average temperature and coldest month average temperature in °C, ETP = potential evapotranspiration (mm), Surplus = water surplus in mm, Deficit = water deficit in mm. Drought period = months when the temperature line is higher than the precipitation line in the Walter Lieth diagram (Walter and Lieth, 1960).