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Investigating the Distribution Pattern of Fritillaria imperialis in the Mahenshan Region of Zanjan Province
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Latafat Moradi1   , Najmmaddin Mortazavi * , Mitra Alaei3 |
1- Faculty of Agriculture, University of Zanjn, Zanjn, Iran
Faculty of Agriculture, University of Zanjn, Zanjn, Iran, Faculty of Agriculture, University of Zanjn, Zanjn, Iran , Mortazavi46@gmail.com
3- Faculty of Agriculture, University of Zanjan, Zanjn, Iran |
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Abstract: (218 Views) |
Selecting appropriate methods for accurately measuring density in shrublands with varying plant densities and distribution patterns is of great importance. Fritillaria imperialis grows extensively in the high-altitude regions of Kahkiloyeh and Boyer Ahmad, Ashtrankuh in Lorestan, the Samsami Mountains of Chahar Mahal Bakhtiari, Golestan Kuh in Khansar, and the Al-Arqan Mahenshan area in Zanjan Province. The Mahenshan Protected Area in Zanjan Province is one of the natural habitats of this rare and endangered species in Iran. In the spring of 2023, this study was conducted to plan and manage the conservation of Fritillaria imperialis and its habitat conditions, using distribution pattern indices. To determine the spatial distribution pattern of plant species in the Mahenshan Protected Area (Al-Arqan), a fixed-area "sampling plot" method was used. A sampling area of approximately 10,000 m² was selected, and sampling was conducted along two transects (20 × 50 m) with 1 × 1 m quadrats. Each case was measured randomly and systematically, and density was calculated by counting all samples. In this study, the distribution of Fritillaria imperialis was analyzed using Taylor, Iwao, and Morris indices. The calculated values for the distribution indices of Fritillaria imperialis using the Taylor, Iwao, and Morris methods showed significant differences at the 5% statistical level. The results indicated that at an elevation of 1800–2000 m, the coefficients for Taylor’s b, Iwao’s β, variance-to-mean ratio (ID), Morisita’s Iδ, and k were 1.27, 1.36, 1.37, 1.17, and 14.91, respectively. At an elevation of 2000–2200 m, these values were 1.45, 1.48, 1.45, 1.25, and 21.48, respectively, indicating an aggregated distribution pattern at both elevation levels. However, the comparison of quadratic coefficients across all methods showed that as elevation increased, population aggregation decreased, and the distribution pattern of Fritillaria imperialis tended toward randomness. Based on the results and the absence of significant differences among the indices, all three indices (Taylor, Iwao, and Morris) can be used to assess the diversity and distribution of Fritillaria imperialis.
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Article number: 13 |
| Keywords: Distribution indices, Conservation, Environment, Rare and natural resources |
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Full-Text [PDF 1703 kb]
(63 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2024/06/24 | Accepted: 2024/09/30 | Published: 2025/04/22
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