جستجوی مقالات مرتبط با کلیدواژه "جنگلداری شهری" در نشریات گروه "جنگلداری"

Human behavior can have a significant impact on forest ecosystems, including urban forests. Encouraging pro-environmental behavior among individuals is crucial to prevent the degradation. Understanding the behavior of visitors to urban forests is an essential step in effectively managing their conservation. Therefore, this study aims to identify the factors that influence environmental behavior among visitors to urban forests in Khorram Abad, Lorestan. By doing so, it seeks to contribute to predicting their willingness to participate in the protection and preservation of these forests.

The study was conducted in the urban forests of Khorram Abad, located in the Lorestan province. The target population was consisted of visitors to these urban forests, and a sample size of 401 individuals was selected using the Krejci-Morgan table. The sample selection process involved proportional allocation based on classification. Data were collected through a questionnaire developed by the researchers. The validity of the questionnaire was ensured by seeking expert opinions, and its reliability was assessed using the Cronbach's alpha test. The statistical analysis employed was the Theory of Planned Behavior (TPB) and its developed model. Descriptive analysis was performed using SPSS, and Smart PLS software was used for structural equation modeling to examine the relationships between independent and dependent variables.

The research findings supported the hypotheses proposed by the Theory of Planned Behavior (TPB). In the extended TPB model, all hypotheses, except for the influence of environmental concern on behavioral intention, were confirmed. The results indicated that the variables in the initial TPB model accounted for 49.4% and 73.1% of visitors' intentions and environmental behavior, respectively. Similarly, the variables in the extended model explained 49.4% and 74.4% of visitors' intentions and environmental behavior, respectively. Notably, the inclusion of environmental concern (EC) in the developed TPB model increased the explanatory power of the environmental behavior variable by 1.3%. All obtained fit indices for both the initial TPB model and its developed version fell within the desired range, indicating a good fit.

The study findings highlight the positive and significant effects of attitude (ATT), perceived behavioral control (PBC), and subjective norms (SN) on visitors' intentions, environmental behavior, and their active participation in protecting urban forests. Understanding these influential factors of environmental behavior and emphasizing the importance of conserving urban forests can facilitate effective conservation measures and enhance visitors' sense of belonging and willingness to participate. This, in turn, can lead to a positive shift in attitudes towards adopting environmentally friendly behaviors.

Citizen engagement in the management of urban forests has emerged as a means to enhance forest conditions and improve the overall experience of forest users. However, several factors can influence people's willingness to participate in such initiatives. Understanding the barriers and grounds for participation from the perspective of citizens is crucial for effective planning and implementation of participatory forest management. This article aims to investigate the factors influencing people's willingness to participate in urban forest management, with a particular focus on socio-economic variables, demographic groups, and the identification of barriers and opportunities for involvement. The study was conducted in the urban forests of Khorram Abad, with a sample population consisting of forest visitors. A total of 400 participants were selected using the proportional assignment method based on the Krejci-Morgan approach. Data were collected through a researcher-made questionnaire, which was validated and tested for reliability. The questionnaire explored various socio-economic variables and their relationship with willingness to participate in urban forest management. Descriptive and inferential statistical analyses were employed to examine the data. The findings indicate that, according to forest visitors, the lack of perceived impact on management programs and the absence of active community organizations are the primary barriers to citizen participation. Key areas for involvement include citizen education, waste management, and tree species protection. The recreational and aesthetic values of urban forests, as well as their positive impact on physical and mental health and air pollution reduction, were identified as crucial functions by the participants. Moreover, the study reveals variations in willingness to participate across different demographic groups. Women showed a higher inclination for participation compared to men, and unmarried individuals exhibited a greater willingness than married individuals. Furthermore, individuals who were members of environmental associations or groups and engaged with virtual environmental platforms demonstrated a stronger desire to participate in urban forest management. The duration of city residency and education level positively correlated with willingness to participate, as did the frequency of visits to urban forests. The research findings highlight the importance of considering socio-economic characteristics when designing participatory programs for urban forest management. While individuals may have different propensities for participation based on their socio-economic backgrounds, the desire to engage in forest management activities remains prevalent. City managers should therefore prioritize planning and educational-promotional initiatives to facilitate and encourage public involvement. By addressing barriers, promoting citizen education, and fostering collaboration with environmental organizations, urban forest management can be effectively enhanced through increased public participation.

The decline of natural forests has been caused urban afforestation to acquire a particular importance with the purpose of green space development level, therefore, the selection of appropriate plant species plays a substantial role in the development and stability of urban green space. The nutrients evaluation is significant in in selection of appropriate species for planting and in a way that species can be selected and supplemented by either consumption of the whole available nutrients in habitat or with their accompanying species.

The present study was conducted to evaluate the high consumption nutrients (Nitrogen, Phosphorus, Calcium, Carbon, Magnesium and Potassium) in the leaves of Mulberry, Ash, Tehran Eldarica Pine and Arizona Cypress in two summer and autumn seasons in four geographical areas (Jamshidieh Park, Sorkheh Hesar Park, Vard Avard Park and Shaghayegh Park) in Tehran. Also, retranslocation of nutrients was measured in four parks and three species (Mulberry, Ash and Tehran Eldarica Pine). At the end of the growing season, the mature green leaves (80 samples) and at the end of the autumn season, the fallen leaves (60 samples) were collected at the base of the tree and packed in zippered bags with the desired specifications on them and transferred to the laboratory. The leaves were washed with sterile distilled water to remove contaminants, then dried in an oven at 70 ° C for 24 hours and then ground. Chemical analyzes were performed using standard instructions. Statistical analyzes such as general comparison of means (one-way analysis of variance) and group means (Duncan test) were performed.

The results of this study showed that the average nutrients in summer leaves are higher than autumn leaves. In Sorkheh Hesar, Shaghayegh and Jamshidieh parks, in summer leaves, the highest amounts of nutrients related to calcium (62.66 mg/g in Shaghayegh Park) and in Alder was recorded. While in Vard Avard Park, the highest amount of this element was observed in mulberry (68.32 mg/g). In autumn leaves, in three parks of Shaghayegh, Jamshidieh and Vard Avard, the highest concentration of nutrients related to calcium (42.66 mg/g in Shaghayegh Park) and was recorded in mulberry. While in Sorkheh Hesar Park, calcium concentration was recorded in Alder (50.66 mg/g). Regarding the percentage of nutrient retranslocation in the studied species in Sorkheh Hesar Park Magnesium (63.04%) in Alder, in Shaghayegh Park Potassium (52.58%) in Mulberry, in Jamshidieh Park Potassium (63.79%) in Tehran Eldarica pine and in Vard Avard Park calcium (41.45%) in mulberry had the highest nutrient retranslocation.

The species studied in this study had different nutrients in their summer and autumn leaves. These species also retranslocation a different amount of each element. It is suggested that this issue be taken into consideration in the management and planning of urban forestry, and the tree species used, which are mainly the main tree species in urban forestry, should be classified based on the status of nutrients.

This research attempted to assess and provide information about biodiversity and distribution of urban tree species by applying several biodiversity indices, including richness, per area estimates of number of species, Shannon-Wiener, Menhinick, Simpson diversity, Shannon-Wiener evenness indexes, evenness index and Sander’s rarefaction technique and also analyzing native and exotic species using i-Tree Eco model both at the city scale and land use classes. Forty-eight species identified among the city. It is estimated that Tabriz had 192800 trees with the 9.4% tree cover. There were 3.6 trees per hectare. The Shannon-Wiener, Menhinick, Simpson diversity and Shannon-Wiener evenness indexes calculated as 2.9, 1, 12 and 0.8 for the whole city, respectively. The green space and agricultural lands had the highest richness. Commercial, transportation and industrial land (CTI) included the most species per hectare. Also, residential areas had the highest value of Shannon-Wiener and Menhinick diversity indexes. The 37.5% of the species was endemic to Azerbaijan.

With the development of urbanization, humans gradually shifted away from nature and, to the same extent and the environmental, physical and spiritual needs of man to the green space are increased. The objective of this study is to locate areas prone to developing urban forestry in the metropolis of Tabriz, from the point of view of the necessity of development and the need of citizens (not ecologically) and present developmental solutions. 14 criteria were chosen as standardized in format of Raster maps based on previous research and expert opinions. The pair comparison table comprised the criteria and the weight and importance of each criterion were calculated. After completing the multi-criteria evaluation process, the final map of the priority areas for the development of urban forestry was produced and the area and the percentage of the first, second and third priorities were calculated. Accordingly, 29.8% of the Tabriz area has the highest priority for the development of green space. In the next step, by overlaying the finalized map with the current land use map, the area and percentage of each of the first, second and third priorities located in the current land use classes were obtained. Comparison of these maps showed that 50% of the priority areas for urban forest development, were located in the existing residential areas, 39% were in vacant fields, 9.5% were in agricultural lands and gardens, and 1.5% were in the current green space. These results indicate excessive and unbalanced construction accumulation in most municipality districts of Tabriz. Therefore the general policy in these areas should be stopping new construction and prioritize changing the worn out texture of the city to green space.

According to the importance of regional differences in the country’s strategic plans and also direct role of urban forests in sustainable development of cities, this research at identifying the regional differences from the perspective of urban forestry indicators. For this purpose, initially, six indicators have been identified and their related data has been gathered for nine urban districts of the Tehran from Tehran Municipality and Park and Green Spaces Organization. In order to weight the indicators for providing Tehran urban forest’s structural indicators, the factor analysis method has been used and structural indicators for the districts have been calculated and categorized. Dividing by the average method was used to remove the differences in scales. The sum of squared rotated loadings and sum of squared extracted loadings showed three components totally can reveal 87.60% of the variances. According to the results, Tehran districts 4 and 22, have been mainly ranked first and second from the aspect of urban forest’ indicators and have better conditions compared with other districts. While district 11, 16 and 10 in Tehran are ranked among the last. For the first time, in this research, providing structural indicators for Tehran urban forests was done, with the aim of more alignment of approved projects with the needs of citizens and improving their quality of life.

Trees are one of the most important constituents of urban green spaces. Considering the high daily traffic of people in sidewalks and vehicles in streets of cities, any defect in trees can lead to life-threatening (personal injury or death) and economic losses. For this purpose, qualitative and quantitative properties and rate of risk possibility of oriental plane (Platanus orientalis L.) trees of Shahid Beheshti St., Urmia were evaluated using transect method with random start point (sampling intensity of 20%). Quantitative factors including diameter at breast height, total height, and qualitative factors including dead woods and branches, cracks, inappropriate branching, structural weakness (defect), wound, root problems and contact with power lines. In total 190 trees were sampled which ranked as follow: 70 trees (36.8%) as very low risk, 102 (53.7%) as low risk and 18 (9.5%) as moderate risk. Finally applying some amending operations such as crown pruning and cutting of dead branches for moderate risk trees are suggested.