Original scientific paper
MICROCLIMATIC AND TOPOCLIMATIC DIFFERENCES BETWEEN THE PHYTOCOENOSES IN THE VILJSKA PONIKVA SINKHOLE, MT. RISNJAK, CROATIA
Oleg Antonić
; Rudjer Bošković Institute, P.O. Box 1016, 10001 Zagreb, Croatia
Vladimir Kušan
; Forestry faculty, Svetošimunska 25, Zagreb, Croatia
Boris Hrašovec
; Forestry faculty, Svetošimunska 25, Zagreb, Croatia
Abstract
The microclimatic differences (based on field measurements) and topoclimatic differences (based on digital terrain model) between phytocoenoses in the sinkhole were tested and
interpreted statistically. The results correspond to previous assumptions regarding climatic differences among phytocoenoses. The relation between the microclimate and the topoclimate was
examined. Insolation quantity significantly correlates with 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 two important causes of 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.
Keywords
air temperature; average relative direct insolation; digital terrain model; karst vegetation; relative air moisture; relative illumination; soil temperature
Hrčak ID:
67763
URI
Publication date:
17.12.1997.
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