Studies on lichen-dominated systems. IX. Topographic influences on microclimate and species distribution

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Abstract
The marked positional relationship of two plant associations dominated by Cladina alpestris and Alectoria nitidula, occurring on lower ridge slopes and exposed ridge summits, respectively, is described. Measurements obtained under conditions of diffuse radiation over the ridge profile show a consistent trend of slower rates of evaporation over the Cladina alpestris association coupled with lower wind speeds and higher temperatures. Conversely, the relative drying rate of Alectoria nitidula on the ridgetop is much faster with higher wind speeds and lower temperatures. Examination of the metabolic response of these two lichen species to the level of thallus saturation and temperature shows an exact correlation with their spatial distribution in the field and the microclimate at these zones.

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