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The influence of northern and southern aspect on forest structural indicators (case study: Tangdalab forests of Ilam province)
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Manouchehr Tahmasebi *   , Seyed Kazem Bordbar2 , Mehdi Puorhashemi3 , Ahmad Hosseini4 |
Agricultural Research, Education and Extension Organization (AREEO), Forest and Rangeland Research Department, Ilam Agricultural and Natural Resources Research and Education Center, AREEO, ilam, Iran , tahmasebi564@gmail.com
2- Forest and Rangeland Research Department, Fars Agricultural and Natural Resources Research and Education Center, AREEO, Shiraz, Iran
3- Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
4- Forest and Rangeland Research Department, Ilam Agricultural and Natural Resources Research and Education Center, AREEO, ilam. |
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Abstract: (1095 Views) |
This study aimed to evaluate the structural characteristics of natural forests and providing the possibility of studying the changes in the structural characteristics of these stands over time, in order to plan and manage the forest in the Tang Dalab region of Ilam, in two geographical directions, north and south. To achieve this, all trees were calipered in two one-hectare plots. Additionally, the structural characteristics were measured using the nearest neighbor’s method. To measure several indices like nearest neighbor distance index (density of trees), uniform angle index and Clark and Evans index (variety of location), Mingling index (species mixture), diameter and canopy differentiation indices (dimensional differences of trees), and complex structural diversity index (tree diversity) were used. The results of uniform angle (south site 0.44 and north site 0.48) and Clark and Evans indices (Southern aspect 1/07 and Northern aspect 1/09) indicated a random spatial pattern of trees. According to the Mingling index, the northern aspect have relatively moderate mixing (0.31) and no mixing (0)in the pure southern aspect). The mean of distance to the neighbors was 8.12 m in northern stand and 5.81 in southern aspect. The results of diameter and canopy differentiation index indicated low difference in diameter (0.24) and canopy (0.24) in the southern aspect and average difference in diameter differentiation (0.41) and high difference in canopy differentiation (0.51) ) in the northern aspect. Complex structural diversity index, indicated more diversity in the northern aspect (0.38) compared to the southern aspect (0.18). The indicators used in this research can be used to describe the structure and ecological characteristics of different tree species in order to increase ecosystem stability and planning to create heterogeneity in the structure of the stand and and help forest managers in planning and making appropriate decisions. However, the effectiveness of these indicators in some situations is doubted by some researchers. .
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Article number: 9 |
| Keywords: Spatial patterm, Oak, Geographical direction, Middle Zagros, Structural characteristics |
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Full-Text [PDF 1428 kb]
(245 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2023/02/26 | Accepted: 2023/10/20 | Published: 2024/03/20
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