Sütçüler yöresi karaçam ormanlarında bitki tür çeşitliliği ve yetişme ortamı ilişkileri

Abstract

This study was routed to analyze the connections between alpha species diversity, species richness and environmental variables of black pine (Pinus nigra Arn. subsp. pallasiana (Lamb.) Holmboe) forests. For this reason, the plant species were recorded by the Braun-Blanquet cover-abundance scale and changed over into fractional values extending from 0-1 in the test territories taken from the common black pine remains in the Sütçüler district. In addition, plant species, the slope position, soil depth, land surface form, soil stoniness were recorded in each sample plots. The maps of elevation, slope, and aspect were acquired from the Digital Elevation Model (DEM) of the region whereas heat and radiation index maps were obtained from aspect and slope maps. Alpha diversity was determined by Shannon, Brillouin, Simpson, and Berger-Parker indices and species richness was determined for each sample plot. To illustrate the connections between all diversity values and ecological site factors in the area, Pearson Correlation Analysis and Principal Component Analysis were implemented. Species diversity resulting from all alpha indices indicated a negative correlation with altitude and percentage of stoniness as a consequence of statistical studies, although it was positively correlated with slope degree and mean temperature levels of the plots As indicated by the outcomes from this investigation, although alpha diversity indices are addressed to natural factors, there is no substantial association between ecological site conditions and species abundance. This has resulted in that the consideration of species richness would not be enough in the studies on the relationship between diversity and the environment. Moreover, the results derived from various diversity indices are slightly different. Hence, it is additionally vital to consider this circumstance in the studies to be carried out.