engleski

Microclimatic and topoclimatic differences between the phytocoenoses in the 'Viljska ponikva' sinkhole, Mt. Risnjak, Croatia

The microclimatic differences (based on field measurements) and topoclimatic differences (based on digital terrain model) between the phytocoenoses in the sinkhole were tested and interpreted statistically. The results correspond to previous assumptions regarding climatic differences between the phytocoenoses. The relation between the microclimate and the topoclimate was examined. Insolation quantity significantly correlates with the air temperature (positively) and relative air moisture (negatively), only after weighting by the relative illumination in the forest phytocoenosis. The first principal component of the soil temperature daily dynamics at four soil depths is not correlated with the other variables, reflecting the particularity of the thermic processes in the soil. The impact of the two important causes of the thermic differences between phytocoenoses was distinguished. The daily air temperature dynamics is basically conditioned by insolation and the nightly temperature dynamics is conditioned by altitude in the sinkhole.

air temperature; average relative direct insolation; digital terrain model; karst vegetation; relative air moisture; relative illumination; soil temperature

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