Browsing by Author "Gul, AU"

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    ARE POLAND AND TURKEY RIVALS IN THE EU AGRICULTURAL MARKET?
    Gencler, F; Turkekul, B; Gul, AU
    Poland and Turkey are one of the largest global producers and particularly exporters of fruits. The export is of great importance to domestic producers of these fruits. This paper attempts to assess Polish and Turkish fruit sectors' competitiveness. For competitive comparison of Poland and Turkey, balance of foreign trade, trade coverage index, share in export and import, specialisation index, relative revealed comparative export advantage index, relative import penetration index, relative trade advantage index were calculated. According to the results, Turkey has shown to have comparative advantage for all periods. In contrast, however, Poland seems to be losing its advantages. Although Poland's competitiveness is diminishing, Poland enjoys free access to EU market.
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    Tree species diversity and its relationship to stand parameters and geomorphology features in the eastern Black sea region forests of turkey
    Ozcelik, R; Gul, AU; Merganic, J; Merganicova, K
    We studied the effects of stand parameters (crown closure, basal area, stand volume, age, mean stand diameter number of trees, and heterogeneity index) and geomorphology features (elevation, aspect and slope) on tree species diversity in an example of untreated natural mixed forest stands in the eastern black sea region of Turkey. Tree species diversity and basal area heterogeneity in forest ecosystems are quantified using the Shannon-Weaver and Simpson indices, The relationship between tree species diversity, basal area heterogeneity, stand parameters and geomorphology features are examined using regression analysis. Our work revealed that the relationship between tree species diversity and stand parameters is loose with a correlation coefficient between 0.02 and 0.70. The correlation of basal area heterogeneity with stand parameters fluctuated between 0.004 and 0.77 (RI). According to our results, stands with higher tree species diversity are characterised by higher mean stand diameter number of diameter classes, basal area and lower homogeneity index value. Considering the effect of geomorphology features on tree species or basal area heterogeneity, we found that all investigated relationships are loose with R-2 <= 0.24. A significant correlation was detected only between tree species diversity and aspect Future work is required to verify the detected trends in behaviour of tree species diversity if it is to estimate from the usual forest stand parameters and topography characteristics.