The study on tree and shrub species diversity changes in the physiographic, soil and vegetation parameters, Case study: district one of Dr. Bahramnia forestry plan

The purpose of this research is investigation on، spatial distribution of tree and shrub species diversity using richness، evenness and heterogeneity indices in different condition of topographic، suborder soil types، forest type and influence of management in the district 1 of Doctor Bahramnia forest. Trees and shrubs attributes obtained from 518 sample plots of forestry plan. Species diversity indices were determined in each plot based on tree frequency and basal area. The topographic primary attributes maps were derived from a digital terrain model of study area. Suborder soil and forest type maps obtained from database of Dr. Bahramnia forestry plan. Mean of indices in different class of variables calculated using GIS functions. Data were analyzed using statistical software by analysis of one-way variance (ANOVA) and the homogenous groups were determined with Duncan’s test in significant level of p‹0. 05. The results indicated that rat of diversity indices in major of tree based species diversity indices calculated with both way، number of trees and basal area of trees were significance statistical difference (p‹0. 05) in different class of altitude، slope، aspect، forest type and suborder soil. Comparison of value diversity between managed stand and unmanaged stand (parcel 32) indicated that these stands in heterogeneity indices that calculated with basal area of trees، exhibiting significance statistical difference (p‹0. 05).