Effect of traditional utilization on woody species composition and diversity through Detrended Correspondence Analyses in the Sardasht Forests (West Azerbaijan Province)

Document Type : Scientific article

Authors

1 Ph.D. candidate of Silviculture and Forest ecology, Department of forestry, Faculty of Natural Resources and Marine Science, Tarbiat Modares University, Noor, I. R. Iran.

2 Assistant Professor, Forestry Department, Faculty of Natural Resources, Urmia University, Urmia, I. R. Iran.

3 Associate Professor, Forestry Department, Faculty of Natural Resources, Urmia University, Urmia, I. R. Iran.

Abstract

In order to investigate the effect of traditional utilization on the diversity and composition of woody species diversity in the western oak forest, two disturbed and less disturbed stands were selected with similar physiographic and floristic conditions. Therefore, 30 circularly shape plots with 1000 m2 surface area were established based on random-systematic sampling with 50×50 m network dimensions. In each sample plot, the frequency and type of woody species were recorded in the prepared sheets of inventory. The average Margalaf species richness indices, Pielo evenness, Shannon-Weiner and Simpson species diversity were calculated in each plot and normalized by Kolmogorov-Smirnov test. To test the significance of the difference between the mean of indices, t-student test was used for normal data and Mann-Whitney U test for abnormal data. Detrended Correspondence Analysis (DCA) was used for ordination of the woody species samples. The results of the study showed that the means of richness and diversity indices in the disturbed stand were significantly lower than in the less disturbed stand; however, the mean of evenness index did not show any statistically significant differences between two stands. High correlation of first axis of DCA proves the importance of destructive factors, such as cutting, branching, frequency of copping, grazing, and qualitative factors, such as basal area and number of trees. These factors plays an important role in differentiation of the forest stands.

Keywords

References

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Forest Research and Development
Volume 4, Issue 3
December 2018
Pages 363-376

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