بررسي تنوع گونه هاي گياهي در ارتباط با عوامل فيزيوگرافيكي در منطقه جنگلي ده سرخ ، جوانرود، استان كرمانشاه

Plant species diversity in relation to physiographical factors at Dehsorkh Woodland.

Species diversity is an important characteristic of bio-communities. Organisms diversity, diversity measurement and hypothesis test in relation to diversity causes are issues which the ecologists are interested in for long period. The aim of the trial was to study plant species diversity in Dehsorkh woodland at Javanroud, Kermanshah province, Iran. For this reason 300 sampling plots were used from which 60 at 256 m^2 and 240 at 2.25 m^2 area. At each plot six diversity indices (Shannonʹs (H), Simpsonʹs reciprocal, Hillʹs Nl, Pielouʹs (J/), Alataloʹs F and Molinariʹs G) with respect to physiographical factors (slope, aspect and altitude) were investigated. The results showed that species diversity was the greatest at north aspects and slopes less than 30% and there was not significant difference between altitude and species diversity. The correlation between species number and indices analysis at each plot and the tendency and the role of each index at different analysis processes showed that the Simpsonʹs reciprocal index is a best index for such research trials.