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

Evaluation of management practices in forests is necessary to determine the appropriate method of sustainable management. Therefore, some quantitative parameters of beech forests, harvested sequentially as shelterwood system and single-selection method were evaluated and compared to a controle compatrment. The control and harvested compartments were selected in Muzisay forest plan in Neka. The measurement was done within 0.1 ha sampe plots in 150×200m gridin 2019. Some quantitative characteristics were measured including the species type, DBH of all trees greater  than 12.5 cm, and the height of eight trees in each sample plot. The results showed that from 2001 to 2019, the frequency of beech in exploited plots increased from 81.51% to 96.2%. The abundance of hornbeam decreased from 14.41% to 2.9%. In control compartment, the beech frequency increased from 89.9 to 93.7% too. The average number of trees in the control plot was gradually declined from 275.5 to 245.83.  In contrast, it increased from 259.23 to 315.81 in managed plots. The opposite was seen regarding to the stand volume. In the managed compartments, the stand volume was declined from 481.47 silves to 426.31 silves. In contrast, it raised from 454.4 to 528.27 silves in control compartment. Both areas had an nearly regular age structure and near to normal volume structure. There were no significant differences between control and harvested compartments in light of total height, average number tree, and volume h-1. The exploitation of these forests by the shelterwood and the single selection method did not cause any destruction.

This study aims at identifying the suitable areas for ecotourism using geographic information system (GIS) and analytical hierarchy process (AHP) in experimental and educational Kheyroud forest, Nowshar, Mazandaran province. The evaluation process was conducted based on three groups including ecological, infrastructural, and socio-economic criteria. Then, the indicators of each main groups were determined. The indicator maps of slope, elevation, aspect, temperature, soil, water resources, landscape, wildlife, vegetation cover (density and type), cow-pens, forestry plan and road were generated in geographical information system environment. The Analytical Hierarchy Process was used for weight determination of indicators. Finally, based on the weighted linear combination method, weighted layers of indicators were integrated in GIS environment and ecotourism suitability map was created. According to the results, slope and water resources indicators and soil and cowspens indicators showed the highest and lowest weights, respectively. In addition, the results of evaluation revealed that 0.17, 38.15, and 61.88 percent of the area have high, medium, and low suitability for ecotourism purposes, respectively. According to the ecological indicators and the development of infrastructural and socio-economic criteria, there is an extensive potential for ecotourism development in the Kheyroud forest