Eurasian Journal of Forest Science

1-19

Authors: İsmail Şafak1*, Altay Uğur Gül2, Mehmet Emin Akkaş1, S. Ümit Portakal3, Mustafa Gediklili4, Ş.Mümtaz Kanat5

In this research, efficiency covering the years 2007-2009 of the forest sub-districts in the Izmir Forestry Regional Directorate was evaluated using 15 variables by fuzzy data envelopment analysis. Fuzzy data envelopment analysis solutions were carried out using the data range. Fuzzy data was established by defining the lower, central and upper limits on the basis of the triangular membership function. These data are converted into interval data considering the approach of Zimmermann (1991) α cutting set. Thus, the upper and lower limits of efficiency values were obtained at five different α (0; 0.25; 0.50; 0.75 and 1.00) using fuzzy data envelopment analysis. Then inefficient forest sub-districts were listed from best to worst using the Minimax Regret-Based Approach. As a conclusion, Göçbeyli, Sarıgöl, Kınık, YeniŞakran and Kemalpaşa forest sub-districts have the best efficiency. On the other hand, Salihli, Gördes, Akhisar, Manisa, Ödemiş and Tire forest sub-districts have the worst efficiency.

38-50

Authors: Ali KAVGACI1*, Orhan SEVGİ2, Hüseyin Barış TECİMEN, Osman Yalçın YILMAZ3, Serdar CARUS4, Türker DÜNDAR5

Pinus nigra dominated forests at Alaçam Mountains at the northwest of Anatolia were sampled, elaborated and classified since those forests represents one of the most typical distiribution of Pinus nigra in Turkey and were not subjected to any phytosociological study. Additionally, pure Fagus orientalis stands at the upland of the mountains were added to the analysis. The ecological conditions were assessed by topographical and environmental (latitude and longitude) factors. Forest vegetation at Alaçam Mountains can be divided into four groups. Three of these communities represent the P. nigra forests whereas the last is formed by pure F. orientalis forest. It was established that the most important ecological factor is altitude, while the other factors do not correlate with the floristic differentiation of the communities. The names of the communities along the altitudinal gradient are as follow: Cistus laurifolius-Pinus nigra dominated forest, Pteridium aquilinum-Pinus nigra dominated forest, Fagus orientalis-Pinus nigra dominated forest, and Galium odoratum-Fagus orientalis dominated forest. These results indicate the rich diversity and differentiation at short distances at the study area, and altitude is the determining ecological factor on this richness. They also explore the need of a broad scale phytosociological study on Pinus nigra forests along whole Anatolia to define their floristic and ecological diversities.