بررسي تاثير كاشت سياه تاغ (Haloxylon aphyllum) بر غنا و تشابه گونه هاي زيراشكوب در منطقه اردستان

A study on the effect of Haloxylon aphyllum plantation on richness and similarity understory species in Ardestan area

This study was done for haloxylon plantation effect on richness and similarity understory in Ardestan area . For this purpose after collect basic information and visit that from haloxylon plantation. Two haloxylon plantation area with the ages ranging from 10-15 years and to >25 years and one reference area for sampling were selected. In each area to used random- systematic method for count number species and count number of individuals (each species in quadrat lxl meteres). So indicators distribution, richness and similarity in each area calculated and used for analysis of variance this indicators research in each of areas. Results showed that haloxylon culture on distribution understory species didnot effect significant, maximum species richness occurs in area haloxylon plantation to ranging to ages 10-15 and minimum species richness in reference area. Among the richness indicators, Menhinick index was significant to Margalef index and will be normal index for this area. Also results showed that maximum species similarity in area haloxylon plantation to age >25 years and minimum species similarity in area haloxylon plantation to ranging ages 10-15 years. Among the similarity indicators, Horn, Jaccard Coefficient, Morisita, Baroni-urbani and Buser coefficient and Sorensen Coefficient indicators were normal indcies for this area beacase this indicators showed up sensitive for this area to Simple Matching Coefficient index.