Natural regeneration of oriental beech (Fagus orientalis Lipsky) trees in canopy gaps and under closed canopy in a forest in northern Iran

Nasiri, Nasrin; Mohadjer, M R Marvie; Etemad, V; Sefidi, Kiomars; Mohammadi, Leila; Gharehaghaji, Maryam

doi:10.1007/s11676-017-0490-8

Cited by 11 publications

(6 citation statements)

References 42 publications

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“…The statistical results showed that the medium and small canopy gaps in turns were more frequent than the large canopy gaps. In accordance with the current result, Amanzadeh et al (2015) found the same frequency for the canopy gap size classes; however, Sefidi et al (2011) and Nasiri et al (2018) indicated that the frequency of small canopy gaps was highest compared to the other gap size classes. Nasiri et al (2018) reported that 70% of all identified CGs were smaller than 200 m 2 in size, and only 3% were larger than 500 m 2 .…”

Section: Resultssupporting

confidence: 88%

“…In accordance with the current result, Amanzadeh et al (2015) found the same frequency for the canopy gap size classes; however, Sefidi et al (2011) and Nasiri et al (2018) indicated that the frequency of small canopy gaps was highest compared to the other gap size classes. Nasiri et al (2018) reported that 70% of all identified CGs were smaller than 200 m 2 in size, and only 3% were larger than 500 m 2 . All these results indicate that naturally fine-scale disturbances much more likely occur in these forests, and also the occurrences are mainly significantly continuous components of this forest dynamics.…”

Section: Resultssupporting

confidence: 88%

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Distribution attributes of natural canopy gaps in the Hyrcanian mixed-oriental beech forests

Mataji¹,

Vahedi²

2021

J. For. Sci.

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One of the most important issues indicating the quality and quantity of forest ecosystems is the distribution of natural disturbances resulting in canopy gaps (CGs). The present study was conducted in one of the Hyrcanian beech forests in northern Iran in summer 2018. The gap areas were classified into small (< 200 m2), medium (200‒500 m2) and large gaps (500–1 000 m2) on the basis of full inventory. The univariate Ripley’s L-function was used for introducing the CG spatial pattern. Furthermore, mark correlation function (MCF) and density function (DC) in turns were used for verifying the correlation and frequency of CG size classes in each pattern. The results showed patterns of the gaps in each size class and integrated by the three size classes, they were random and cluster, respectively. Furthermore, the MCF revealed that the gap size classes were independently located in the clusters. The total frequency of the small, medium and large gaps in turns was 32, 49 and 19%, respectively. Although the density share of medium and small gaps in turns was more frequent than the large gap density in the study forest, the results of DC indicated that the frequency of each gap size class was random within each cluster, regardless of their density share. Based on the natural gap aggregations, the base circular mosaic with an area of 5 000 m2 can be introduced for monitoring and specifying the forest stand dynamics.

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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 88%

Distribution attributes of natural canopy gaps in the Hyrcanian mixed-oriental beech forests

Mataji¹,

Vahedi²

2021

J. For. Sci.

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“…preserving shrub cover) would increase suitable habitats for the species. Browsing and grazing can be serious threats to germination and may hamper height growth in trees (Nasiri et al 2018). This may eventually lead to an empty forest floor (Goetsch et al 2011).…”

Section: Implications For Conservation and Future Researchmentioning

confidence: 99%

Habitat modeling of the common pheasant Phasianus colchicus (Galliformes: Phasianidae) in a highly modified landscape: application of species distribution models in the study of a poorly documented bird in Iran

Ashoori¹,

Kafash

Moradi

et al. 2018

The European Zoological Journal

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The common pheasant is listed as a nationally protected species in Iran because it faces many threats such as habitat destruction, pollution from pesticides and overhunting. The species' habitat selection remains unknown in Iran; consequently, conservation planning for the species is hampered by this lack of information. In this study we used predictor variables including topographic, anthropogenic, land cover and climate and 122 occurrence points to model the distribution of common pheasant (subspecies P. c. talischensis), in Gilan province, Iran. The results showed that distance to agriculture and orchards as well as distance to plantation forests were the most important variables in predicting species distribution. Furthermore, we found that the total potential suitable habitat for the species in Gilan province is 315,990 hectares. We observed a shift of the species to higher altitudes in the province. We recommend raising awareness about the presence of the species especially among private landowners, creating a network of protected areas on private land, and changing land-use policies at the provincial level as essential measures for the conservation of the species in Gilan province. Our results can be applied to management and conservation of the species in other modified or rapidly changing landscapes.

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“…Because the forest vertical structure largely determines the differences in the distribution of resources such as water, heat, light, and nutrients in the forest [ 16 ], it has an important effect on species growth, reproduction, death, and resource utilization [ 17 – 19 ]. Therefore, many researchers have begun to explore the impact of forest vertical structure on regeneration.…”

Section: Introductionmentioning

confidence: 99%

Influence of strata-specific forest structural features on the regeneration of the evergreen broad-leaved forest in Tianmu Mountain

2021

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The vertical stratification of the stand may lead to a high heterogeneity of microenvironment in the forest, which further influences the understory regeneration and succession of the forest. Most relevant previous studies emphasized the overall effects of the Whole-stand structural characteristics on understory regeneration, while the strata-specific impacts of the overstory should be explored especially for those forests with a complicated combination of overstory species and heights. In this study, a subtropical evergreen broad-leaved forest in Tianmu Mountain of China was intensively investigated within 25 plots of 20 m × 20 m, aiming to find out how significant the stratified overstory (trees with diameter at breast height (DBH) ≥ 5 cm) structure and non-structure characteristics impact the understory (trees with DBH < 5 cm) regeneration. Regardless of species composition, the studied overstory was evenly divided into three strata (i.e. upper, middle and lower strata) according to their heights. Redundancy analysis was applied to explore both overall and strata-specific forest structure on characteristics (height, DBH, species diversity, and density) of tree regeneration. We found that the overall effect of the whole overstory on the forest regeneration depended mostly on diameter at breast height (DBH), tree species richness index and crown width. However, when analyzing with the strata-specific characteristics, the most pronounced impact factors for the regeneration were tree height of the upper and lower forest strata, tree species richness index and crown width of the middle and lower forest strata, and the competition index impact of the lower forest stratum. Among the three strata, the lower forest stratum showed the most significant impact with three characteristics on the understory regeneration, which may be attributed to their direct competition within the overlapping near-ground niches. Among the new generations, seedlings and saplings were more sensitive to the overstory structural characteristics than young trees. Our results suggest that the overstory showed strata-specific effects on the understory regeneration of evergreen broad-leaved forests in subtropical China, which provides theoretical basis for strata-specific forest management in similar forests.

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Natural regeneration of oriental beech (Fagus orientalis Lipsky) trees in canopy gaps and under closed canopy in a forest in northern Iran

Cited by 11 publications

References 42 publications

Distribution attributes of natural canopy gaps in the Hyrcanian mixed-oriental beech forests

Distribution attributes of natural canopy gaps in the Hyrcanian mixed-oriental beech forests

Habitat modeling of the common pheasant Phasianus colchicus (Galliformes: Phasianidae) in a highly modified landscape: application of species distribution models in the study of a poorly documented bird in Iran

Influence of strata-specific forest structural features on the regeneration of the evergreen broad-leaved forest in Tianmu Mountain

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