Bartın Orman Fakültesi Dergisi (Journal of Bartin Faculty of Forestry)

9

Authors: Ayhan USTA, Murat YILMAZ, Lokman ALTUN

Plant species compositions in the ecosystem and soils developed under these species compositions cause nutrients to be fixed or transport away from the site. The change of plant species compositions of forest ecosystems in precipitation watersheds changes the quality of water produced from these watershed. Especially, the fact that species such as Alder with nitrogen fixation ability enter into plant species composition will be effective on nutrient cycling. In this study, the effect of Alder on nitrogen transport to surface waters and therefore the cation losses in the ecosystem in stands where it is dominant was investigated. For this purpose, 36 surface water samples from 3 sub-watersheds selected in Şimşirli stream watershed throughout 1 water year and 39 soil samples from 15 soil profiles opened in forest areas were taken. While water quality parameters such as pH, EC, total nitrogen (TN), nitrate (NO3-N), ammonium (NH4-N), Ca++, Mg++, K+ and Na+ were determined in surface waters, sand, silt, clay, pH, EC, soil organic matter, total nitrogen and exchangeable cations (Ca++, Mg++, K+ and Na+) were determined in soil samples. TN and NO3-N concentrations in surface waters have increased along with the increase in the rate of forest area in the lower watersheds. Increase of NO3-N concentration in surface waters increased the basic cation (Ca++, Mg++ and K+) concentrations. This situation shows that leaching of nitrate in the sub-watersheds increases the cation losses. Annual TN transport in the sub-watersheds varied between 6.17 - 95.09 kg N Ha-1 and was 44.93 kg N Ha-1Year-1 on the average. Findings obtained as a result of the study suggest that Alder might be an important species under the control of the ecosystem and provide valuable information about the possible eutrophication of Galyan-Atasu dam reservoir.

11

Authors: Ali Naci TANKUT, Abdurrahman KARAMAN

In this study, the creep properties of demonte bookcases, which are produced with different fasteners and wood based materials were investigated. Particleboard (YL) and medium density fiberboard (MDF) were used as wooden composites materials and also trapez connector with metal parts, metal minifix connector with metal peg, metal minifix connector with plastic peg, metal T connector, pipe type connector, and corner fitting were used as connectors. Demonte bookcases were exposed to static loading for six months by considering the critic loads which could effect while in service use. According to the results, the highest creep value was obtained particleboard (YL) with metal minifix connector with plastic peg combination as 1,321 mm, the lowest creep value was obtained medium density fiberboard (MDF) with trapaze connector with metal combination as 0,577 mm. It was determined that the bookcase produced by using medium density fiberboard (MDF) and metal trapez connector better than the bookcase produced by using particleboard (YL) and metal minifix connector with plastic peg combination.

12

Authors: Saadettin Murat ONAT

Metal plate connectors enhance the load transfer by increasing the bearing area between wood member and the fastener. Because of having many advantages, metal plate connected (MPC) wood trusses have been widely used for over 50 years in many building applications especially in prefabricated homes. In this study, the possibility of using Timberstrand® laminated strand lumber (LSL) as a raw material was investigated. The behavior and the performance of metal plate connected Timberstrand connections loaded perpendicular to the grain in tension and shear at 0o, 45o and 90o orientations has been examined in accordance with ANSI TPI 1995 standards. According to the test results, Timberstrand joints performed better than solid southern pine joints in both tension (51%) and shear (10%) loading. This means that Timberstrand LSL has a very good potential for use in the truss fabrication industry.

13

Authors: Tendü Hilal GÖKTUĞ, Gamze KURKUT

National parks and other protected areas which are rich in natural and cultural resources values and offering economic recreational opportunities, more demanding with each passing day. More recreational uses negatively affect the resource values and visitor satisfaction. For the last 30 years in developed countries, visitor management has been discussed within the framework of sustainability. Visitor management frameworks based on recreational carrying capacity analyses have been developed and visitor management plans have been established. Visitor management strategies defined in these plans and have been developed the appropriate management tools in accordance with this strategies. In this study; visitor management strategies and management tools were examined and a unique classification system was developed. And also the issues were discussed on a national scale and presented proposals

14

Authors: Meliha AKLIBAŞINDA, Aslıhan ERDOĞAN

Today, with the growing number of buildings, cities move away from nature and green spaces remain trapped between the building masses. As cities turn into artificial environments, longing for nature and green increases every day. Planted roads which play an important role in the urban identity constitute the foundation of urban open-green space. Moreover, urban road plantation makes aesthetic, functional, ecological, psychological and economic contributions to the city.In the scope of this study, seven important routes in Nevşehir City have been examined. The plant species which are used in road sides, central refuge and intersections along these routes have been identified. In addition, contributions of the road plants to the city and to urban open-green area systems have been evaluated within the framework of the plantation principles. With obtained data, by defining each route, dominant plant species have been identified and plant keys of the related roads have been established. As a result, there has been efforts to create characteristic roads with plantations in the Nevşehir City but it is determined that wrong plant type selection and improper planting techniques have been used in these practices. Therefore, plant species which have suitable diameter, form and size should be preferred in applications within the framework of urban road planting design techniques.

18

Authors: Yıldız ÇABUK, Murat YEŞİLKAYA, Selman KARAYILMAZLAR

Manufacturing of woodworking machinery (MWM) has been growing in parallel to furniture and other forest products industry since 1940’s. Nowadays the number of manufacturers in this sector is growing rapidly but this growth brings various structural issues similar to every other sector. In this study, determination of structural characteristics and issues of MWM sector were aimed. For this reason, a questionnaire study comprised of 38 questions was carried out. Simple random sampling method was applied to 57 different enterprises and the results were tabulated and analyzed accordingly. According to the results obtained structure and issues of the enterprises were identified and recommendations were presented. Thus, it is emphasized that sector delegations and government officials are needed to cooperate to find concrete solutions to the issues of the sector. It is also recommended that sustainable technological investments with the help of government support will help modernizing the sector. Hence, it is foreseen also that these recommendations will lead to increase product quality, to achieve more economical production and increase success rate under heavy competition.