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Showing 5 results for Hosseini
Effects of some of Persian oak tree and stand characteristics on crown dieback rate in oak forests of medium Zagros
Ahmad Hosseini,
Volume 1, Issue 1 (9-2014)
Abstract
Crown dieback is of the phenomena that mainly has affected Persian oak trees. In order to assess the crown dieback of trees in forest stands of oak trees and its relationship with the individual trees, tree origin and size of tree canopy, Shalam forested area in the northern half of the Ilam province was selected. After dividing the study area into topographic homogeneous units, the biggest unit was selected for assessing the research objectives. Within the selected unit, 6 parallel transects were laid and about relatively 60 healthy and dieback trees were recorded. Then crown dieback, position of tree in stand, origination of trees, minimum and maximum crown diameter and crown height were measured. Data analysis was performed by analysis of variance and linear regression. Results showed that individual trees had healthier crown than the rest of the trees. Standard trees showed less crown dieback than the coppice trees. Effect of crown size on crown dieback depended on the location of trees as single or group and tree form. Totally it can be concluded that oak trees would give different responses to drought in terms of their individual or social characteristics and also it was seen a range of crown dieback with different intensity/pattern within stand in individual to group trees.
Investigating Nutrient Quality and Litter Decomposition of Lebanon Oak (Quercus libani) in Early Stages of Decomposition Process in the Northern Zagros Forests (Case Study: Hoare Khul Forests in the City of Baneh)
Farhad Ghasemi Aghbash, Geshin Allah Veisi, Vahid Hosseini,
Volume 3, Issue 1 (9-2016)
Abstract

Litter decomposition is the most important way of nutrient entering to soil and soil nutrient availability is highly related to dynamics of nutrients and litter decomposition in the forest ecosystems. This study aimed to evaluate the dynamics of nutrients and litter decomposition in the northern Zagros forests using litterbag technique for 180 days in the Khul Hoare forests located in Baneh city. The litter bags were collected at intervals of 30, 60, 120 and 180 days and the rate of leaf litter decomposition and chemical compounds such as nitrogen, carbon, phosphorus, potassium and calcium were measured. The results showed there was no significant correlation between the rate of decomposition and the initial composition of nutrients and also C: N and C: P ratios. Due to the qualification of leaf litter based on the amount of nitrogen in this study, the average amount of nitrogen in Quercus libani was 1.37%. So Lebanon oak can be classified in the average group and it can be considered as a soil improver species. In the studied litter, phosphorus and nitrogen had a similar performance and their concentration increased over time (7.27 and 30.38 mg/g respectively). While concentration of elements such as calcium, potassium and magnesium was decreased. The nutrient concentration of Quercus libani leaf litter was Ca>N>P>K> Mg.


Relationship Between Spatial Pattern of Persian Oak (Quercus brantii Var Persica) and Wild Pistachio (Pistacia atlantica) Trees with Some Site and Stand Characteristics in Manesht Forests of Ilam Province
Ahmad Hosseini, Seyed Mohsen Hosseini,
Volume 3, Issue 2 (3-2017)
Abstract
Background and objectives: Understanding the spatial pattern of tree species in their social life could have many applications from the standpoint of ecology and applied silviculture for their optimal management. For the purpose of studying the spatial pattern of Quercus brantii and Pistacia atlantica in relation to stand form and topographic factors, we selected the Manesht forested area in northern Ilam. Materials and methods: In this research, 75 sample plots (with 2000 m2 area) were chosen, using systematic random sampling method within the study area. The variables in the plots comprised the number of tree species and topographic factors. The dispersion indices of interest included Morisita, Sstandard Morisita, Green, Lioyd and variance to mean ratio. The calculation of quantitative indices, by running the relevant computational formulas, was performed by Ecological Methodology Software. In addition, in terms of accuracy, the efficiency of quantitative indices was studied and compared. Statistical analysis of data was carried out using SPSS Software. Results: The results showed that, for Q. brantii, the values of variance to mean ratio, Morisita and Lioyd indices and for P. atlantica, the values of Morisita, Green and Lioyd were higher in standard and coppice stands than the coppice and standard stands. For both species of Q. brantii and P. atlantica, all of the indices in question increased with increasing elevation, and the highest values of indices were obtained in 2100-2300 m a.s.l. For Q. brantii, the values of all of the indices increased with increasing slope, and the highest value was obtained in the slope class more than 60%. Moreover, for P. atlantica, the highest values of all indices were obtained in the slope class of 30-60%. The spatial pattern in classes of 0-30% and 30-60% was clumped and in more than 60%, it was regular. For Q. brantii, the values of all indices and for P. atlantica, the values of Morisita and Lioyd were the highest in the southern direction. The results of the precision study of the indices showed that for Q. brantii, the indices of Morisita and Standard Morisita and for P. atlantica, indices of Standard Morisita and Green had the highest precision. Conclusion: It was concluded that the value of dispersion indices (especially more accurate indices) varies by environmental factors and thus changes in values could be used in forest dynamic studies and the interpretation of changes in forests.

The effect of the seed weight of chestnut-leaved oak (Quercus castaneifolia) on the growth, survival and quality index of produced seedlings
Seyed Mohsen Hosseini, Davoud Kartoolinejad, Somayyeh Ghaffari,
Volume 4, Issue 2 (9-2025)
Abstract
In the present study, the effect of the seed weight of chestnut-leaved oak on the growth, survival and seed quality index of the produced seedlings was investigated. 800 oak seeds were collected from the branches facing the light in the middle part of the crown of a mature tree in Tamishan Noor region. The collected seeds were classified into four classes including the weight of each seed less than 4 g, 4 to 6 g, 6 to 8 g and more than 8 g. 400 seeds from the above collection were placed in the germinator after dividing into four seed-weight-classes in the laboratory in order to compare the germination percentage. The remaining 400 seeds were planted as four weight classes, including 100 seeds in each class, in nursery of Koloudeh Amol. The results showed that the percentage of seed germination did not have a significant difference among the treatments. However, the seedlings produced from larger seeds reached a higher seedling height at even 3 months and 8 months, and had a larger collar diameter than that, being statistically different. The percentage of survival was also higher in the seedlings obtained from larger oak seeds. Meanwhile, the SQ seedling quality index did not show a statistically significant difference among various seed weight treatments. Since the planting of taller and thicker seedlings has more successful results in terms of competition with invasive plants in the gaps and considering their higher survival percentage, it can be recommended using larger seeds of chestnut-leaved oak in seeding, seedling production in nurseries and planting in forest fields to produce tall oak seedlings.
 
Assessment of forest road condition after a logging ban in the Kelardasht forestry plan
Seyed Ata Ollah Hosseini, Hanieh Pouya, Mohsen Abdullahi,
Volume 4, Issue 2 (9-2025)
Abstract
Background and Objectives: Forest roads are critical infrastructure for forest management, conservation, and access. During periods when forest management activities and timber harvesting are suspended, the maintenance of existing roads may decline. However, a road's condition is not solely dependent on the cessation of harvesting; factors such as longitudinal slope, drainage, road geometry, soil properties, rainfall, road age, initial construction quality, and traffic also contribute to its deterioration. Therefore, this study aimed to descriptively compare quantitative and qualitative indicators of road condition across two longitudinal slope classes (>7% and <5%) on a secondary forest road within the Kelardasht Forestry Plan, located in the Hyrcanian forests. The primary objective was to evaluate the effect of slope magnitude on the degradation and deterioration of forest road pavement during a logging-ban period.
Materials and Methods: Eight road segments were investigated, each situated between two consecutive cross culverts. Four segments were in the less than 5% slope class, and four were in the greater than 7% slope class. Field data collected included the longitudinal slope of each segment and the condition of culverts, side ditches, road surface, and cut-and-fill slopes. Quantitative variables for each class were summarized using the arithmetic mean, while categorical variables were reported descriptively.
Results: In segments with a slope greater than 7%, a higher frequency of road surface degradation indicators, culvert blockage, side ditch malfunction, and cut slope instability was observed. The mean longitudinal slope was 7.75% in the greater than 7% class and 2% in the less than 5% class. The mean cross slope was 4.75% and 2.5%, respectively. Signs of erosion were observed below the culvert outlet in all segments of both classes. Culverts on slopes greater than 7%, along with cut slopes, had a more significant impact on erosion and side ditch blockage, consequently increasing runoff on the road surface, which led to the formation of potholes and the loss of surfacing material.
Conclusion: While signs of road degradation were observed in both slope classes, the frequency of certain degradation indicators was higher in segments with slopes greater than 7%. These results highlight the necessity of regular monitoring and maintenance of culverts, side ditches, road surfaces, and cut-and-fill slopes. Adequate and urgent budget allocation for the maintenance and repair of existing roads is essential. This study's novelty lies in its integrated recording of indicators for road surface, drainage, culverts, and cut-and-fill slopes across defined longitudinal slope classes. The resulting checklist can serve as a practical basis for subsequent monitoring and for identifying segments in need of repair and maintenance.
 

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