Evaluation of afforestation success by broad leaf species in Arak city

Abstract

In order to investigate on situation of broad leaf afforestationin Arak city, a forest plantation around 160 ha, including ash (Fraxinus rotundifolia) and Black locust trees (Robinia pseudoacacia) was selected. For every species three treatments employed: 1- area with suitable and organized management and high social effects, 2- area with moderate irregular management and medium social effects and 3- area with low organized management and low social effects. Line sampling method was used for forest inventory regarding to the stripped shaped of the forest area by 200m intervals between plots. Finally, 148 sample plots with 200m2 surface area were measured. In each sample, qualitative and quantitative characteristics were recorded. T and Tukey tests were applied for quantitative data analysis as well as Kruskal-Wallis and Chi-Square tests for qualitative data. Seven soil profiles were digged for studying of soil condition in the study area. In each profile, two soil samples (depths 0-30 and 30-60 cm) were taken to analyze soil chemical and physical properties. Principal components analysis (PCA) was used to analyze soil characteristics. The results showed that the area with regular management has better condition than other treatments. Evaluation of plantation success indicated that black locust species is more successful  than ash trees considering quantitative characteristics and plantation establishment indices. However, considering qualitative characteristics and aesthetic issues as well as visual vision, ash tree generally has more privileges