Vaišvydavos girininkijos medynų vertinimas biologinės įvairovės požiūriu ; The Estimation Of Stands Biodiversity In Vaisvydava Forest District
There were estimated stand biodiversity and made biodiversity hotspots network was main object of the master work. The object of the work – Vaišvbydava forest districkt in Dubrava experimental educational state forest enterprise. The aim of the study – to estimate forest stand by biological diversity indexes and to establish the best spots to maintainig the biodiversity in Vaišvydava forest district. Working methods - forest management and data analysis of the stand species diversity indices of 1958, 1978, 1988, and 2003 years, the analysis of preservation territories, key habitats and rare and endangered species, and made biodiversity hotspots network. Study results - Number of trees in the stand in 1958 was 10 and in 1978 years was 12, 1988 and 2003 – 13. This led to the origin of july, poplar, maple and Douglas-fir. Diversity and Proportionality indexes decreased in 1958 – 1988 years period and was increasing in period from 1988 to 2003 years. Dominance index increased in 1958 – 1988 years, because the dominance of the pine and spruce in the stand and was increasing. But the same index was decreased in 2003 years. That happened because the invasion of the Ips typographus to the stands of spruces, and may be influenced in now a day's politics of silverculture in Lithuania. It means that diversity of stand species is increasing, though it was decreased from 1958 to 1988 years. There were found 12 species of Data Red Book of Lithuania in Vaisvydava forest district, 1 preservation, 3 territories of reserves and also 17 forest key habitat territories, part of the region park. That shows that biological diversity is high on the analyzed territory. There were made network of 1 first level, 5 second level, 6 third level territories. There were identified important for biodiversity conservation territory ( 6 blocks) in The West of district, which were concentrated of biodiversity elements. Keywords: biological diversity, stand species diversity, biodiversity index, biodiversity element, preservation territories, key habitat, rare species.