The Diversity of Plant Species in Rangelands (Ordu Region, Turkey)

Abstract

The study was carried out in the rangelands of Ordu located in the Euro-Siberian floral region between 2009-2010 is to present the plant species diversity of the local rangelands. In this study, 246 genera, 461 species and subspecies belongs to 61 different families were identified in the research area. The distribution of taxa according to phytogeographic regions is as follows: 42.28% Euro-Siberian, 5.94% Irano-Turanian, 4.04% Mediterranean and 47.74% unknown region or widely distributed. The families with the largest number of genera are Asteraceae (48; 11.85%), Fabaceae (47; 11.16%) and Poaceae (43; 10.21%), respectively. The richest genera are Trifolium L. (16 taxa), Campanula L. (10 taxa) and Medicago L. (8 taxa). The distribution of taxa according to life-form is as follows: 261 Hemicryptophyte (62.00%), 83 Therophyte (19.72%), 40 Geophyte (7.96%), 23 Chamaephyte (5.46%), 8 Phanerophyte (1.90%) and 6 Hydrophyte (1.43%). The study identified 421 taxa of which 318 are perennial, 76 are annual, 19 are biennial, 3 are annual and biennial and 5 are biennial and perennial. The endemism rate is 6.89% (29 taxa). The risk status of 15 taxa was evaluated according to International Union for Conservation of Nature and Natural Resources (IUCN) risk criteria.