منوچهر نمیرانیان Articles List

List of Articles منوچهر نمیرانیان

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1 - Investigation of Height-Diameter Models in Different Development Stages of Unmanaged Beech Forest(Case Study: Educational and research forest of Kheirud)
Vahid Alijani Manouchehr Namiranian Jahangir Feghhi Omid Bozorg-Haddad Vahid Etemad
10.22034/jest.2020.11182

Background and Objective: Height Measurement of all trees in a forest or forest stand is almost impractical. For this reason, today different researchers prefer to estimate the tree height by the relationship between the DBH and height of trees. Method: In this study, More

Background and Objective: Height Measurement of all trees in a forest or forest stand is almost impractical. For this reason, today different researchers prefer to estimate the tree height by the relationship between the DBH and height of trees. Method: In this study, to fitting different statistical models in different stages of forest development, after field inspection, three one hectare sample plots located in different development stages in Beech forest of Kheirud forest, Natural Resources Faculty in Tehran University were selected. Then the DBH of 251 trees have been measured randomly and 80 percent of trees were used for modeling and 20 percent were used to validate 22 regression models. In order to determine the best model for each of development stages, R2, E, MBE and NMPE criteria were used. Findings: The results of this study indicated the suitability of Rational Function and Weibull models in initial stage, Modified Exponential in optimal stage and Gompertz and Richard models in Decay stages. Discussion and Conclusion: Based on the results of this study it can be concluded that different regression models doesn’t have the same ability in fitting the data of DBH and height of different forest stands and the same model can’t be used to fit the data of DBH and height of different forest stands. Manuscript profile
Open Access Article
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2 - Determination of the Optimum Plot Size to Study the Spatial Patterns of Juniperus Excelsa Trees (Case study: Atashgah, Karaj)
Vahid Alijani Seyed Mohammad Moein Sadeghi Manouchehr Namiranian Reza Akhavan
10.22034/jest.2018.19723.2857

Background and Objective: In recent years, new methods have been developed for analyzing spatial pattern of trees, and for verifying the spatial pattern, they need to complete map of spatial location of these trees. The use of these methods depends on study scale in a w More

Background and Objective: In recent years, new methods have been developed for analyzing spatial pattern of trees, and for verifying the spatial pattern, they need to complete map of spatial location of these trees. The use of these methods depends on study scale in a way that changes in study scale cause changes in spatial pattern. In this regard, present study aims to determine the optimum area of sample plots to quantify the spatial pattern of Juniperus Excelsa M. Beib. In southern facing slopes of Alborz mountains. Method: A plot with area of six hectares was selected and spatial pattern of trees were evaluated by using g(r) function. In next step, area of plot decreased to five, four, three, two, and one hectare and spatial pattern of trees were determined by using g(r) function and were compared with six hectare plot. Findings: The results of this function indicates regular spatial pattern in trees distances to four meter, cluster pattern at distances of six to ten meter, and random pattern shows in other distances. The results of comparing figures of g(r) functions in different area showed that the overall trend of this functions almost constant up to three hectares. Hence, in this study the appropriate area is achieved three hectares. Discussion and Conclusion: It should be noted that in structure studies to determine the best area of plot could reduce time and costs while increasing the precision of the study. Manuscript profile
Open Access Article
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3 - Quantitative Determination of the Selected Nests Pressure of Wood Species in the Middle Forest of Northern Iran (Case study: Gorazbon section of Kheyroud forest)
Sajjad Babaie Mahmood Bayat Manoochehr Namiranian Sahar Heidari Masteali fatemeh Ahmadloo
10.22034/jest.2020.47024.4807

Background and Objective: Understanding the ecological niche of the different species is essential in many ecological issues.  Ecological niches of species are one of the important factors in the tree species distribution pattern and for all species, it can be dete More

Background and Objective: Understanding the ecological niche of the different species is essential in many ecological issues.  Ecological niches of species are one of the important factors in the tree species distribution pattern and for all species, it can be detected by examining distribution of species distribution. Ecological nest models often help to understand more ecosystems. These models are applicable in predicting ecosystem stability and sustainability ratios and ecosystems. Method: In order to determine the selective pressure of different species, the indicators of the equilibrium level of selected nests, the dominant level of selected nests and the crisis level of selected nests were used and 41.5 hectares of Khirud research and educational forest were fully surveyed (100%). Then, characteristics such as diameter equal to the chest of the trees were measured and using selective nesting indices, the selected pressure and nesting levels of beech, oak, hornbeam and alder species were measured. Findings: The values of the selective pressure were measured for the species on the Fagus orientalis 66.419, Quercus persica 3. 313, Carpinus orientalis 261. 28, Alnus 36. 962 and tilia begonifolia 9. 39 respectively. The final results showed that Carpinus orientalis wasat a Dominates niche level, the Fagus orientalis and Alnus was in the balance niche level and the Quercus persica was in intermediate between balance and critical level and also tilia begonifolia was in the critical niche levels. Discussion and Conclusion: The Carpinus species were at the dominant level of selective pressure, the Tilla species were at the equilibrium level and the Quercus species were at the equilibrium level of the crisis nest. The results of this study showed that selective strain quantification is an important factor in determining the current status of endangered species. Manuscript profile
Open Access Article
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4 - The views of local and governmental forest stakeholders on agriculture and livestock in the Almaneh forests in Sarv Abad city
Soroush Zabihollahi javad mirzaei farzad eskandari manuchehr namiranian arezo soltani
10.22034/jest.2021.49101.4901

Background and Objectives: Forest conversion to agriculture, Forest Understory cultivation and grazing in the forest are considered as the most important factors in the destruction of Zagros forests and in this regard, local and governmental stakeholders have different More

Background and Objectives: Forest conversion to agriculture, Forest Understory cultivation and grazing in the forest are considered as the most important factors in the destruction of Zagros forests and in this regard, local and governmental stakeholders have different and contradictory views together. The purpose of this study was to gain a perspective of stakeholders regarding agricultural and livestock activities in Almaneh allotment forests in Sarvabad city. In the Almaneh`s forest village, agricultural activities whether farming or horticultural are carried out either inside the forest (in the form of understory farming, or deforestation and conversion to agriculture and orchard) or at the edge of the forest which in any case affects the forest. In this village livestock also has a direct impact on the forest and it can always be described as an integral part of the forest.Material and Methodology: The statistical society of this study includes the people of Almaneh village and some experts of the Natural Resources and Agricultural offices of Kurdistan province. The main instrument of the study is a questionnaire and In total, 115 local and state stakeholders views using a Likert scale on Forest conversion to agriculture, Forest Understory cultivation and grazing in the forest were investigated. Kruskal-Wallis and Mann-Whitney tests were used for data analysis using SPSS software.Findings: According to the results, local stakeholders are not aware of their activities in deforestation and agricultural experts agree with them. But natural resources experts have opposite view. In other words, local and state practitioners have a different perspective on many aspects of the activity and the conflict between local practitioners and government experts, especially natural resource experts, is clearly visible.Discussion and Conclusion: So, from a stakeholders perspective, a common item is selected as the selected stakeholders item in all three activities, which shows that these activities are due to economic problems and the lack of local people's income.  Manuscript profile

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