جستجوی مقالات مرتبط با کلیدواژه « topsis » در نشریات گروه « جنگلداری »

Forest logging prohibition is one of the most important challenges in the management of Hyrcanian forests that it has diffrent consequences. The purpose of this study is identifing, weighting and prioritizetion the positive and negative consequences of the forest logging prohibition from economic and social aspects in forests in the east of Mazandaran province (forests managed of the department of natural resources and watershed of Mazandaran province (Sari). The statistical population of the study consists of a group of 60 people including experts and specialists, faculty members specialized in this field and rural communities living in the margins of managed forests. In the study we used the Delphi method for identifing the consequences of the forest logging prohibition, the entropy technique used to calculate the weight of them and the preferences technique based on the similarity to the ideal solution (TOPSIS) used to prioritize them. The analysis of the research findings identified 6 positive and 17 negative consequences from economic and social aspects for the forest logging prohibition based on 55 questionnaires received.The results of consequences weighting showed that among the positive consequences, the consequences of increasing the economic values of forest environmental services and the tendency towards wood cultivation with weights 0.200573 and 0.200426 respectivly, and from the negative consequences, increasing wood smuggling 0.05163 and reducing employment 0.0513133 have the most weight. The results of prioritization of consequences showed that among the positive and negative consequences, changing the dependent management of wood to multiple management forest and increasing wood smuggling have the highest priority among other consequences. Also the results showed that in positive consequences, economic perspective and in negative consequences, social perspective gained more weight. Therefore, we are suggested that in order to implement the forest logging prohibition plan, programs considered for accurate, continuous monitoring and budget allocation for increaseing forest protection and reduce wood smuggling and create job opportunities by the government.

Forest logging is one of the most important goals of forest management system having different economic and social consequences. This research aims at identifying, weighting and prioritizing the economic and social consequences of forest logging using the points of view of the experts, specialists in this fild and rural communities on the margins of forested forests. For thispurpose, forests managed by the department of natural resources of Mazandaran province in Sari were selected. In this regard, a researcher-made questionnaire has been used to identify the effective and important consequences of forest logging from both economic and social perspectives. Entropy technique has been used to calculate their weight and TOPSIS has been applied to prioritize them. Analyzing the findings of this study by using 55 questionnaires identified 12 positive and 8 negative consequences from economic and social aspects of forest logging. The results of weighting the positive and negative consequences of forest logging using entropy technique showed that employment created positive consequence with weight (0.083560) and logging costs negative consequence with weights (0.125503) had the highest weight among other consequences. Also the results of prioritizing the positive and negative consequences of forest logging by TOPSIS technique showed that the economic viewpoint had the highest priority in both consequences. Therefore, it is suggested more attention be paid to the positive and negative economic consequences of forest logging in forest management programs and not to focus only on stopping the forest logging.

Forest management plan are prepared for desirable use of forest products, ensuring the survival and continuous production. In forest management plan, designing appropriate roads play an important role.  In this study, Delphi technique and statistical parameters such as mode, median, mean, and binomial test were used to select the criteria. Afterwards, the criteria were weighted using TOPSIS method based on pairwise comparison and a road construction utility map was prepared by combining the criteria map and the weight of each by linear weighting method. Based on the suitability map, nine road network variants were designated and evaluated using PEGGER in ArcView software and the best option was selected. The weight of factors such as slope, forest stock and natural terrace were calculated 0.42, 0.24 and 0.10, respectively. Among all, the three variants including 3, 5, and 7 with 5725.01, 5668.88, and 5573.85 unit value per km revealed the best road networks. The study results showed that considering the environmental and technical criteria in the forest road designing mitigate environmental impact and reducing maintenance costs. Therefore, it is possible to design more suitable forest roads by combining GIS and Pegger software.

National parks have basic role in conservation of natural ecosystem in national and universal area. Since identification and prioritization ecological, economical and social criteria and indexes for assement of national parks are very important. Therfor in this study, we use Delphi questionnaire for identification very important ecological, economical and social criteria and indexes indexes in assement of national parks and Entropy technique used for calculation wight of them. In the continue multi-criteria decision making techniques such as SAW and TOPSIS used for priority of ecological, economical and social indexes of national parks. The analysis of result of study use of Delphi method identificated 129 indexs and 7 criteria from aspect ecologic, economic and social for national park that after customization 89 ecologic indexes, 7 economic indexes and 15 social indexes was determinate. The result of Entropy technique showed that protective and environmental functions criteria whit 0/228161 weight, concervation of biological diversity whit 0/168609 weight, maintenance and development of social functions whit 0/148688 weight and productive capacity and functions whit 0/109170 weight recpectivly had the highest weight . Also the result of TOPSIS and SAW techniques showed that that protective and environmental functions criteria and concervation of biological diversity aspect of ecology have more proity in comparison whit other criterias. The comparison between two methods showed that result of TOPSIS technique is better than result of SAW and it more near than to reality. National parks have basic role in conservation of natural ecosystem in national and universal area. Since identification and prioritization ecological, economical and social criteria and indexes for assement of national parks are very important. Therfor in this study, we use Delphi questionnaire for identification very important ecological, economical and social criteria and indexes indexes in assement of national parks and Entropy technique used for calculation wight of them. In the continue multi-criteria decision making techniques such as SAW and TOPSIS used for priority of ecological, economical and social indexes of national parks. The analysis of result of study use of Delphi method identificated 129 indexs and 7 criteria from aspect ecologic, economic and social for national park that after customization 89 ecologic indexes, 7 economic indexes and 15 social indexes was determinate. The result of Entropy technique showed that protective and environmental functions criteria whit 0/228161 weight, concervation of biological diversity whit 0/168609 weight, maintenance and development of social functions whit 0/148688 weight and productive capacity and functions whit 0/109170 weight recpectivly had the highest weight . Also the result of TOPSIS and SAW techniques showed that that protective and environmental functions criteria and concervation of biological diversity aspect of ecology have more proity in comparison whit other criterias. The comparison between two methods showed that result of TOPSIS technique is better than result of SAW and it more near than to reality.

The selection of tree species is one of the most important steps to achieve a successful forest plantation projects. In this study we used Analytical Hierarchy Process (AHP) and Technique for order of Preference by Similarity to Ideal Solution (TOPSIS) techniques in order to selecting the suitable species for plantation endeavors using tangible and intangible criteria in southern Zagros forests. The problem is decomposed into 3 levels to better study of the problem. Goal of the problem was adjusted at the first level and accordingly six criteria were located at the second level, including conservation cost, cost of price, growth speed, resistance, adaptation and the conservation of soil and water. Also five alternatives were located at the third level including Quercus persica, Pistacia atlantica, Pyrus commonis, Cupressus arizonica and Thuja orientalis. The results of expert’s judgments showed that the resistance to the environmental condition was the most important criteria and Quercus persica was the most suitable species (priority scores= 0.321) accordingly, while Thuja orientalis introduced as a less important species for this objective (priority scores = 0.104). The results of TOPSIS confirmed these results, too. Totally, the results showed that we should much focus on native species in rehabilitating Zagros forests and Quercus persica may only be a prominent species than the other species for achieving this objective.

With regard to the importance of the conduction of limit resources to the superior industries، study on the country’s priorities in the industrial areas and products is essential. Considering the fact that Qom province has special conditions، this provincecan be consideredas a wood centerin the wood industry in which prioritizing the wood and paper industries is essential. To reach this goal two stepsare needed to be taken، the first step is to design a hierarchy based on five major groups of criteria which are financial & economical، infrastructure، material & product، technical & man force، and social & cultural. The weight of the indicators was established by Analytical Hierarchy Process. In the second step، based on the criteria weighing values، alternatives have been ranked through TOPSIS. The results showed that financial and economical criterion as a major group has the highest priority with. 28 weighing value and investment attraction as a sub criterion has a weighing value of. 11. Besides، the results of the alternatives ranking showed that the other types of wood furniture alternative gain the maximum priority and the printing، writing، and newspaper papers gains the minimum priority.