A Phytosociological Study of Vavsar Area in Chahardangeh of Sari

Vavsar area covers an area of 2413 hectares situated in 53°37΄35˝ - 53°4345˝ longitude and 36°540˝-36°1013˝ latitude. The vegetation of Vavsar area was studied, using the Braun-Blanquet (Zygmatist) School. Based on the analysis of phytosociological data and by using AFC and CAH methods, 8 associations were recognized. The Following associations constitute the major part of the area: Astragalo caspici-Onobrychidetum cornutae, Stachyetum laxae, Fagetum orientalis, Querco macrantherae-Fagetum orientalis. The distribution of plant associations in the protected areas is mainly affected by topographic features, including altitude, slop and exposure as well as edaphic factors, such as soil depth and texture. In general, these factors operate in the establishment of plant communities in the different elevation zones and slopes.