I khosravi - Forestry graduate student at Azad University Branch
m. es-hagh Nimvari - Professor and Faculty Member of Islamic Azad University Branch
p samadi - Forestry graduate student at Azad University Branch
h jamshidzad - Forestry graduate student at Azad University of Ilam

Zagros site is one the most important biologic resource in our country and it has special importance in about vastness, plants and animals kinds, Genetic reserves and pastures below storey. This district is a part of middle Zagros forest ecosystem which is located in Arghavan valley and it has extensive plants kinds because of formation and growing ups features we do this research of to recognize the possible relation between nurse plants and related species under and out of canopy and finding out its effects on plants species and regenerate and recognizing zones floor dominant results of land navigation on 700 hectares of districts forest showed that we identify 82 grass species which belongs to 66 kind and 32 family and 5 trees species 7 shrubs species. Results showed nurse species has significant effect on diversity regenerate, richness of plants species, consequently we observed most regenerate, diversity and richness under nurse plants canopy and minimum regenerate, diversity and richness out of nurse plants canopy and also for a domain has effective effect an diversity and richness of plants cover on southern zone we observed maximum richness and species diversity, despite we didn’t observe any distinction for evenness on this view point. Slope doesn’t have remarkable on richness and diversity because mobile plants are exist in other nurse species and origin of this is that nurse species maintain suitable microclimatic and they prevent erosion soil by trunk and root are plant

Ilam, Zagros, biologic diversity scales, specie nurse, along with plants