Dr. Fűköh Levente szerk.: Malakológiai Tájékoztató 16. (Eger, 1997.)
SÓLYMOS,P.-NAGY, A.: The recent mollusc fauna of the szársomlyó (S Hungary): spatial pattern and microclimate
We made our less accurate surveys during almost clear sky conditions on 21-22 August, 1997. We recorded the air temperature (T) and the relative humidity (RH) using dry- and wet-bulb thermometers at 0, 0.2, 0.4 and 2 m hights in three different environments: on the rocky slope (RSL), on the grassland (GRL) and in the scrub (SCR). All these places are exposed to the S. The parameters of the linear regression of the data pairs (Tables 1 and 2) show the following. The pairs differ the most from each other at 0 m (see Pearson coefficient), the GRL has the most intensive changing in T and RH because the slope of the regression line is below 1 in each cases except one. Changings in the scrub are minimal, all the changings are growing with the hight and the changings at 2 m are quite equal. Table 1. Parameters of the linear regression for air temperature data pairs. Legend: (h) hight in meters, (a) slope of regression line, (b) intercept of regression line, (r 1 ) Pearson correlation coefficient. Table 2. Parameters of the linear regression for relative humidity data pairs. Legend: (h) hight in meters, (a) slope of regression line, (b) intercept of regression line, (r 2 ) Pearson correlation coefficient. Area pairs h(m) a b r Grassland-Scrub 0.0 0.4286 11.6350 0.9040 Grassland-Scrub 0.2 0.5882 8.4480 0.9191 Grassland-Scrub 0 4 0.6863 6.7046 0.8923 Grassland-Scrub 2.0 0.8857 2.6747 0.9471 Grassland-Rocky slope 0.0 0.7203 7.0324 0.7653 Grassland-Rocky slope 0.2 0.7971 4.8805 0.8540 Grassland-Rocky slope 0.4 0.7957 4.8218 0.8077 Grassland-Rocky slope 2.0 1.0010 0.6966 0.9170 Area pairs h(m) a b r Grassland-Scrub 0,0 0,4926 31,6320 0,8638 Grassland-Scrub 0,2 0,6763 18,7590 0,8767 Grassland-Scrub 0,4 0,7589 12,3550 0,8780 Grassland-Scrub 2,0 0,8050 9,3752 0,7799 Grassland-Rocky slope 0,0 0,812-1 4,4018 0,7489 Grassland-Rocky slope 0,2 0,9219 1,4775 0,7884 Grassland-Rocky slope 0,4 1,0636 -5,6255 0,7854 Grassland-Rocky slope 2,0 0,8035 9,3568 0,7964 We examined the diurnal running of T and RH differences (Figs. 1 and 2) between 0 and 2 m hights for the three different environments. If T difference is above 1 °C the vertical T profile belongs to the insolation type (positive gradient), ifit is between 1 °C and -1 °C it belongs to the isothermal type (no significant gradient), and ifit is below -1 °C it belongs to the emission type (negative gradient). If RH difference is above 0% RH profil belongs to the wet, if it is below 0% it belongs to the dry type. • CO RH («/.) — RSL -*-GRL —SCR Fig. 1. Diurnal running of air temperature differences between 0 and 2 m hights for the three different environments. Legend in the text. Fig. 2. Diurnal running of relative humidity differences between 0 and 2 m hights for the three different environments. Legend in the text. T gradient is isothermal in the SCR during the whole day. It is positive on the GRL and on the RSL in the daytime. During the nighttime it is negative on the GRL and isothermal on the RSL. RH gradient is wet all day in the scrub and in other areas in the nighttime. It is dry on the GRL and on the RSL in the daytime and never in the scrub (Figs. 1-4).
