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    Effect of Timber Harvesting Techniques and Slopes on Soil Respiration of Young and Mature Black Pine Stands in Northwestern Turkiye
    (North Carolina State Univ Dept Wood & Paper Sci, 2025) Genc, cigdem Ozer; Sariyildiz, Temel; Aricak, Burak
    Releases of CO2 from forest soils was studied relative to different timber harvesting techniques, slope classes, and stand age. Three timber harvesting techniques (suspended skidding (SS), skidding by using a skidding cone (SC), and cable-pulling (CP)) were used in young and mature black pine stands at three different slopes (0 to 20% - S1, 20% to 33% - S2, and > 33% - S3). Soil respiration measurements were carried out at five-day intervals (1st, 5th, and 10th day) and 6 months later after the timber harvesting techniques. The soil respiration increased on the first day, decreased on the 5th and 10th days, and reached its lowest level on the 6th month. The SC technique in the young stands showed the highest soil respiration value on the slopes indicating that the cone placed on the head of the log during the skidding operations does not deform the soil. In the mature stands, all timber harvesting techniques and the undisturbed sites showed lower values than in the young stands on the S1. On the S2, mean value was higher in the mature stands. In contrast to the young stands, the undisturbed stands had the highest soil respiration.
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    Effects of Land Use Types and soil Depths on Soil Organic Carbon and Total Nitrogen Stocks of Karacabey Floodplain Forests in Northwest Turkey
    (Springer, 2022) Sariyildiz, Temel; Aygun, Derya Ozcelik; Parlak, Salih; Tani, Mert
    To evaluate soil organic carbon (SOC) and total nitrogen (TN) stocks of ash, alder and oak tree stands in Karacabey floodplain forest and adjacent Calabrian pine forest, grassland, cropland and sand dune in relation to soil depths (0-130 cm), a study in three replicate sites for each tree and the adjacent sites was carried out in northwest Turkey. The results indicated that among the tree species, alder stands had the greatest SOC (3.97%) and TN (0.328%) and total accumulation of SOC (405 Mg ha(-1)) and TN (34.4 Mg ha(-1)), followed by ash tree (3.11%, 0.302%, 393 Mg ha(-1) and 26.2 Mg ha(-1) respectively) and oak (2.43%, 0.220%, 293 Mg ha(-1) and 28.6 Mg ha(-1) respectively). However, the grassland showed the highest cumulative SOC densities within 0-130 cm depth (678 Mg ha(-1)) compared to the tree species. It also showed higher TN densities (27.5 Mg ha(-1)) than the ash tree and the Calabrian pine stands, whereas lower than the alder and oak stands. The sand dunes showed the lowest SOC and TN values. Compared to the soil depth of 0-30 cm, mean SOC and TN stored in 30-130 cm soil depth accounted for 58% and 40% in ash stands, 41% and 45% in alder stands, 52% and 56% in oak stands, 57% and 66% in Calabrian pine stands respectively. Thick alluvial soil and dry climate in the region could be responsible for the better root system development, and thus much higher SOC and TN stocks into deeper soil layers.
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    EFFECTS OF LOGGING RESIDUES AND SKID ROADS ON LITTER DECOMPOSITION RATE AND NUTRIENT RELEASE OF BLACK PINE (Pinus nigra Arnold) AND SCOTS PINE (Pinus sylvestris L.)
    (Croatian Forestry Soc, 2022) Enez, Korhan; Savaci, Gamze; Sariyildiz, Temel
    Needle litter decomposition rate and nutrient releases of pure stands of black pine and Scots pine under the three different micro-ecologic sites (skidding road, the logging residues and mineral topsoil) and the control site (nonharvesting site) were studied. The needle litters of Black pine and Scots pine were initially analysed for total carbon and nutrient concentrations (N, P, K, Ca, S, Mg, Mn, and Fe). The litter decomposition experiment using the litterbags method was carried out in the field for 18 months. The Scots pine needle litters decayed faster than the black pine litters. Both the Scots pine and Black pine needle litters showed higher mean mass losses under the mineral topsoil and the logging residues than under the skid road and the control site.
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    Recent Advances in UAV-Based Structure-from-Motion Photogrammetry for Aboveground Biomass and Carbon Storage Estimations in Forestry
    (Springer Nature, 2023) Gülci, Sercan; Akay, Abdullah Emin; Aricak, Burak; Sariyildiz, Temel
    Due to economical, ecological, and social changes over the last decade, managers and researchers in nature-based disciplines intend to use both traditional and innovative remote sensing (RS) technologies for best management practices. RS, which has grown interest in forestry, offers rapid and reliable assessment tool to monitoring and observing. Several successful studies in literature have indicated that the RS use in forestry is light the way of the most effective evaluating various forest ecosystems. Recent developing unmanned aerial platforms play as a low-cost and inexperienced user-based multi-image processing by using computer vision techniques for forestry studies. Forests, where are essential natural resources for the future, are the pool of biomass and carbon storage, and they need periodical monitoring to sustain. A sustainable management of carbon balance and biomass in mountainous forests includes exhausting effort in field-based studies. However, the RS as a tool for study on biomass and carbon storage can be received as the most effective prediction and nondestructive method in combination with structure-from-motion techniques. Considering recent opportunities in data science and unmanned aerial vehicles (UAVs), RS and photogrammetry in forestry have still played an indispensable role in the evolution of forests. This chapter aims to review the recent advanced knowledge on the progress of the use of UAV technologies in accordance with advanced photogrammetry-related applications in the quantification of forest aboveground biomass and carbon storage. A comprehensive literature search has been performed on the use of UAV-based SfM photogrammetry for UAV-based forest biomass and carbon storage studies. © Springer Nature Singapore Pte Ltd. 2022.
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    The Current Status of Forest Residues and Disposal Machinery in Turkiye
    (Forest Engineering and Technologies Platform, 2024) Gülci, Sercan; Sariyildiz, Temel; Akay, Abdullah Emin
    The term "cutting residue" is a widely used term in Turkey, which refers to the leftover pieces of logs in the forest after cutting, except for the logs. As of yet, there is no specific expression and explanation for the term "slash" in Turkish forestry. Turkey carries out intensive forestry activities based on industrial wood production, primarily in mature stands and damaged after disasters such as fire or storm fall. Products that do not carry industrial woodiness in the stand, such as branches, roots, and tips that are not suitable for industrial production, are considered firewood and used for energy production or left in the stand. As a result, it is observed that the collected cutting residues from the fields that are sufficient in terms of benefit and cost is burned to generate electricity in electricity generation stations. Due to the demand for forest-based wood raw materials in recent years, some domestic companies have begun converting thick branches into industrial products such as paper and chipboard production. Additionally, some studies have been conducted to reduce transportation costs in bringing cutting residues to the economy, focusing on the storage and processing of forest cutting residues on the landing sites. In this regard, small-scale chipping machines have been produced by the domestic industry. Therefore, slash disposal and mechanization have a very limited place in Turkish forestry. Decision makers need to prepare action plans in this regard and provide support to joint research projects with academic units. © Copyright 2024 by Forest Engineering and Technologies Platform.