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Diversity indices or floristic quality index: Which one is more appropriate for comparison of forest integrity in different land uses?

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Abstract

Zagros forest in Iran has been heavily altered by anthropogenic disturbances such as farming, grazing and other activities. In this study, we first estimated the herbaceous plants coefficient of conservatism within this region. Forest integrity of different land uses was then assessed by common measures of plant diversity and the indices were specifically developed to estimate vegetation integrity (conservatism coefficient, floristic quality index and modified floristic quality index). As complementary approaches, some soil physiochemical properties were applied to judge forest integrity. A total of 81, 82, 88, native species were recorded in understory grazing (UG), abandoned fields (AF), and protected area (PA) land uses, respectively. Common species had higher abundance in AF land use, whereas specialized species were found in PA land use. Diversity indices and modified floristic quality index values were higher in AF land use compared to UG and PA land uses, and fisher alpha diversity index highlighted the significant differences in the plant diversity among land uses, while PA land use had high species richness with greater number of sensitive species and floristic quality index. Soils under PA land use showed the highest organic carbon, nitrogen and pH. Based on results, floristic quality index and mean coefficient of conservatism can be more informative than species-diversity measures in assessing floristic integrity and in contradiction to diversity indices, are accurate tools to determine differences in the integrity of land uses. Results indicate that PA land use have indeed progressed ecologically toward a vigorous ecosystem as observed by the development of its vegetation community.

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Acknowledgements

We are grateful to the expert panel of botanists for their generosity of time and expertise as well as their passionate contribution to the paper by assigning the C0C scores to the species. Much thanks to Gholam-Hasan Veiskarami for his assistance in vegetation surveys and identification of plant species. We would like to thank Michaeleen E. Gerken Golay for her helpful comments and contribution to the manuscript editing. Special thanks to the colleagues and students who collaborated in the data collection.

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Correspondence to B. Pilehvar.

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Communicated by Daniel Sanchez Mata.

This article belongs to the Topical Collection: Forest and plantation biodiversity.

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Mirazadi, Z., Pilehvar, B. & Abrari Vajari, K. Diversity indices or floristic quality index: Which one is more appropriate for comparison of forest integrity in different land uses?. Biodivers Conserv 26, 1087–1101 (2017). https://doi.org/10.1007/s10531-016-1287-3

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