Oytun Emre Sakici

• PhD
• Professor (Associate) at Kastamonu University

Sustainable management of forest ecosystems requires assessing forest dynamics and project stand growth and yield in order to make strategic decisions. The size–density relationship is one of the most important measures in quantifying the carrying capacity of a forest ecosystem and determining appropriate silvicultural decisions. In this study, the...

Aim of study: In this study, relationships between ecological factors including topography, climate, soil properties and site productivity of Crimean pine (Pinus nigra J.F. Arnold subsp. pallasiana (Lamb.) Holmboe) stands in the Kastamonu region of Türkiye were investigated. Area of study: The study was conducted in Crimean pine stands of Kastamon...

Türkiye has come a long way since the introduction of first nationwide topographic map coverage in 1959-60. Since then, many distinctly scaled topographic, geologic, administrative, etc. maps have been produced and put into service with the interested parties, domains and projects. Due to including considerable amount of surface and land-cover deta...

Energy security had become a serious global concern after the COVID-19 pandemic. The Russian-Ukraine war has further aggravated this issue by disturbing fuel supplies all over the world. This has created the scarcity of fuels leading to a drastic price hike in the international markets resulting in a critical setback to the economies of the develop...

Bu çalışma kapsamında, Kastamonu ve Sinop Bölge Müdürlükleri sınırları içerisindeki üç farklı ekorejyonda yayılış yapan doğal ve saf Karaçam (Pinus nigra subsp. pallasiana (Lamb.) Holmboe) meşcerelerine ilişkin çap dağılımları incelenmiş ve modellenmiştir. Çalışma materyali olarak 274 adet örnek alan verisinden faydalanılmış ve her bir örnek alanın...

Site productivity, defined as the production amount of the stand at a specific age, has a significant impact on the growth of the stand and site index is used as an indicator of site productivity. The objective of this study is to develop ecoregion-based dynamic site index models for Scots pine (Pinus sylvestris L.) stands in the Kastamonu and Sino...

In this study, the effects of some stand characteristics (i.e. stand stage, crown closure and site class) on stand-level biomass allocation were investigated in Scots pine (Pinus sylvestris L.) stands, which is one of main coniferous tree species of Türkiye. The study was conducted in pure and even-aged Scots pine stands located in Karadere Forest...

Ecoregion-based height-diameter models were developed in the present study for Scots pine ( Pinus sylvestris L.) stands in Turkiye and included several ecological factors derived from a pre-existing ecoregional classification system. The data were obtained from 2831 sample trees in 292 sample plots. Ten generalized height–diameter models were devel...

Industrial wastewater contains a variety of substances such as organic carbon, salts and heavy metals, which along with arsenic (As), cadmium (Cd), lead (Pb) and nickel (Ni) are known to be highly toxic even in very low concentrations. This study was carried out to test the impact of industrial effluent from the Industrial Estate Islamabad, the cap...

Bu çalışmada, Kastamonu Orman Bölge Müdürlüğü sınırları içerisindeki eşit yaşlı, saf ve doğal karaçam meşcerelerindeki (Pinus nigra J.F.Arnold) ağaçlara ilişkin şekil katsayılarının incelenmesi amaçlanmıştır. Araştırma materyali olarak farklı bonitet sınıfı, kapalılık, gelişim çağı, ekorejyon, sıklık ve yaştaki meşcerelerden alınan 120 örnek alanda...

Forest ecosystems are important carbon sinks in the fight against global climate change. Increasing and sustainable management of forest ecosystems plays a critical role in reducing carbon emissions. Determining the carbon stock of forest ecosystems impacts the global carbon budget and sustainable forest management. With this study, the temporal an...

Depending upon the technological advancements, many differently scaled topographical maps were manufactured and put into service in Türkiye. In this particular study, the elevation values of 1:25.000 scaled topographic maps produced with analogue means in 1992-1993 period were compared to later produced, digital means integrated 2009-2010 period ma...

There are many ways one can decide if an engineering related undertaking would be feasible and productive when the topography is thoroughly and precisely investigated before it takes shape. Forestry is just one profession that proper planning is of the essence when it comes to the logging phase of the entire production process. Logging in Türkiye i...

Most terrestrial carbon (C) is stored in forests, an important source of fiber and fuel for humans. Therefore, forests play an essential role in mitigating the effects of climate change by reducing the carbon level in the atmosphere. Field measurements and remote sensing techniques determine the stored above-ground carbon (AGC). This study used Sen...

Background Biomass increment, one of the main components of net primary production (NPP) in forest ecosystems, plays an important role as well as total biomass in the global carbon cycle. In this study, the changes of increments of the above-ground total, stem and branch biomasses depending on stand characteristics (i.e., stand age, stand density,...

In this study, the effect of pine mistletoe (Viscum album subsp. austriacum) on basal area increment of Crimean pine and Scots pine was investigated. Dendrochronological data were collected from 223 (71 uninfected and 152 infected) Crimean pines and 195 (77 uninfected and 118 infected) Scots pines located in Kastamonu province of Turkey in 2014. In...

Background Leaf area index (LAI) is an important stand characteristic in terms of forest productivity and stand growth, and it shows significant correlations with other stand characteristics. In this study, it is aimed to reveal the relationships between LAI and some other stand characteristics, i.e. mean diameter, stand age, dominant height, site...

Elevation, vertical accuracy of any topographic Earth representation, e. g. stereo surface models, topo maps, DEMs, etc., is important if such data will be the base of further projects or development plans. The main form of these types of data in Türkiye is “1:25000” scaled quad maps. The third generation such maps were produced via digital stereo...

Investigation and numerical determination of the effects of ecologically different regions on forest growth are important issues to be considered for sustainable forest management. In this study, differences in growth patterns of Crimean pine (Pinus nigra subsp. pallasiana [Lamb.] Holmboe) stands among the ecoregions located in the Kastamonu region...

Monitoring forest resources using satellite images has been employed for different forest inventory purposes. This study used remote sensing data to derive regression models for estimating some stand attributes, including mean diameter, stand basal area, stand volume, number of trees, and stand density of pure Scots pine (Pinus sylvestris L.) stan...

Large infestations of bark beetles result in the death of many trees in large forest areas. Ecological-based modeling approaches that include the factors causing infestations are important for accurately predicting whether these infestations will occur, suggesting ways to avoid large infestations, and understanding sustainable forest management. In...

The six-toothed bark beetle Ips sexdentatus is one of the most important pests of coniferous trees that can cause extensive tree mortality, and change the structure and composition of forest ecosystems. Many abiotic and biotic factors affect the infestation of bark beetles. Early detection of forest stands predisposed to bark beetle infestations wi...

In this study, the effects of white mistletoe (Viscum album subsp. abietis (Wiesb.) Abromerit) on diameter increment in Kazdağı fir (Abies nordmanniana subsp. equi-trojani (Asc. & Sint. ex Boiss.) Coode & Cullen) stands distributed in Kastamonu region of Turkey were investigated. For this purpose, a total of 183 sample trees (77 healthy (uninfected...

Tek ağaç ve meşcere gelişimleri ekolojik faktörlere bağlı olarak değişim gösterebilmektedir. Bu çalışmada, Kastamonu ve Sinop yöresi saf ve doğal sarıçam (Pinus sylvestris L.) meşcereleri için ekorejyon tabanlı tek ağaç çap artım modeli geliştirilmiştir. Bu amaçla, çeşitli ekolojik faktörlerin birlikte değerlendirilmesiyle oluşan ekolojik bölge sın...

The great spruce bark beetle, Dendroctonus micans, is an invasive pest that has spread to almost all of the Picea orientalis forests in Turkey, affecting many trees and causing active damage. The species-specific predator Rhizophagus grandis plays an important role in suppressing populations of this pest because it is only found in D. micans galler...

Monitoring forest resources using satellite images has been employed for different forest inventory purposes. This study used remote sensing data to derive regression models for estimating some stand attributes, including mean diameter, stand basal area, stand volume, number of trees, and stand density of pure Scots pine (Pinus sylvestris L.) stand...

Generalized height (h)–diameter (d) models were developed for Crimean pine stands in the Kastamonu Regional Directorate of Forestry, northwestern Turkey. Nine generalized h-d models were fitted and evaluated based on data set consisting of 2697 h-d measurements obtained from 274 sample plots located in three ecoregions of the studied region. The be...

In this study, it was aimed to model the diameter distribution of Scots pine (Pinus sylvestris L.) stands in Kastamonu region. The effects of various stand characteristics (number of trees, mean diameter, stand density, site class, crown closure, developing stage and stand type) on the determination of the most appropriate distribution function wer...

In this study, it is aimed to evaluate and to compare the management purposes and functional allowable cut amounts of planning units in Kastamonu Regional Directorate of Forestry.

Development of artificial neural network (ANN) models to estimate stem tapers of individual trees in mixed Fagus orientalis and Abies nordmanniana subsp. Equi-trojani stands distributed in Karabük region of Turkey, and comparison of the ANN models with stem taper equations were aimed in this study. The measurements were obtained from 516 sample tre...

For above-ground biomass and carbon stock estimations, the most common single- and double-entry allometric equations were fitted for Crimean pine (Pinus nigra J.F. Arnold subsp. pallasiana (Lamb.) Holmboe) stands in Kastamonu region, northwestern Turkey. The data were obtained from 227 sample trees in 192 sample plots that represent different stand...

In forestry applications, tree stems of Crimean pine (Pinus nigra J.F.Arnold subsp. pallasiana (Lamb.) Holmboe) are produced and evaluated without bark, and volumes of tree stems are calculated as under-bark for commercial trades in Turkey. In harvesting process of tree stem, bark is abandoned to forest land. Even if bark is not evaluated as a prod...

In this study, it is aimed to develop models to predict crown diameter (CD), crown projection area (CPA), crown length (CL) and crown height (CH) for Crimean pine (Pinus nigra J.F.Arnold subsp. pallasiana (Lamb.) Holmboe) stands in Kastamonu region, Turkey. For this purpose, field measurements were made on 107 sample trees taken from the stands at...

Ovaj rad ima za cilj da identifikuje karakteristike lešnika četiri različite populacije (Agli-Tunuslar, Agli-Musellimler, Arac-Guzluk i Tosia-Kucuksekiler) u severozapadnom regionu crnomorske regije Turske, jednoj od najvažnijih oblasti od ekonomskog interesa za ovu vrstu. Tamo, Turski lešnik (Corylus colurna L.) raste u optimalnim uslovima i otkri...

Forest resources inventory is one of the essential parts of the sustainable forest management. Remote sensing applications have broad usage areas for this aim, since field measurements are costly, time consuming and laborious. Monitoring forest resources with various satellite images has found wide usage areas in forestry. In this study, the relati...

Turkish hazelnut (Corylus colurna L.), the mother land and natural spreading area of which is Anatolia, is one of the important hazelnut species in Turkey. Moreover, thanks to its adaptation capability to extreme climate and poor soils conditions, it is a forest tree species playing a key role in climate change scenarios. Turkish hazelnut, a Euro-S...

Small trees and saplings are important for forest management, carbon stock estimation, ecological modeling, and fire management planning. Turkish pine (Pinus brutia Ten.) is a common coniferous species and comprises 25.1% of total forest area of Turkey. Turkish pine is also important due to its flammable fuel characteristics. In this study, compati...

The aim of this study was to develop single-and double-entry over-bark and under-bark stem volume equations for pure and natural Crimean pine (Pinus nigra J.F.Arnold subsp. pallasiana (Lamb.) Holmboe) stands in Kastamonu Regional Directorate of Forestry. A total of 227 sample trees taken from available sites, densities, and ages were measured for o...

Some dynamic site index models based on the generalized algebraic difference approach (GADA) were fitted for Crimean pine (Pinus nigra J.F. Arnold subsp. pallasiana (Lamb.) Holmboe) stands in Taşköprü, Turkey. Data were obtained from 132 dominant trees representing the wide range of site quality in the region. Nonlinear regression analysis and a se...

The most effective ways to prevent or reduce global warming are to reduce carbon emissions and increase carbon stocking. Forests are very important, because of consuming CO2 more than other ecosystems and keeping carbon locked up in their components in long term. Forests are important carbon pools and play critical role in prevention of global warm...

Forests, which are one of the most important renewable natural resources, are managed by taking economical, ecological, social and cultural functions into consideration. The forests inside the planning units are planned according to management purposes determined by these main functions and the mentioned utilizing activities are carried out conside...

Diameter at breast height is a main parameter of trees that can be measured accurately and easily and shows close relationship with the different many other features of trees. To determine the volume of stands as one of the most important issues of forest inventory, although there are many methods in forestry literature, in general volume tables ar...

In this study, it is intended to model the diameter distribution by utilizing 9 different probability density functions including Beta, 2-parameter Gamma, 3-parameter Gamma, Johnson’s SB, 2-parameter Lognormal, 3-parameter Lognormal, Normal, 2-parameter Weibull and 3-parameter Weibull in even-aged and pure black pine (Pinus nigra J.F.Arnold) stands...

Forest ecosystems which contain half of the terrestrial carbon deposits; play a significant role in shaping the global climate. Two different methods are used to determine the above-ground carbon stock capacity of forestlands. Direct measurement method takes a long time and requires both extensive as well as expensive field and laboratory work. One...

Forest ecosystems which contain half of the terrestrial carbon deposits; play a significant role in shaping the global climate. Two different methods are used to determine the above-ground carbon stock capacity of forestlands. Direct measurement method takes a long time and requires both extensive as well as expensive field and laboratory work. One...

Digital elevation data, commonly known as DTM, DEM, DTD, etc., consist of a group of elevation measurements recorded for regularly spaced positions distributed over any given land surface. These are the most widely used means to analyze the earth surface. They are the topographic representation of the earth surface excluding the objects which are o...

The diameter distribution is one of the most powerful tools for depicting the properties of a stand. Diameter has generally strong correlations with other important stand variables including basal area, volume, etc. Quantification of the diameter distribution and its relationship to site, stand composition, age, and density is often valuable for bo...

In this study, a review of the avaliable literature on stem taper functions was conducted and 29 stem taper functions from three model groups (simple polynomial, segmented and variable-form stem taper functions) were analysed for Pinus nigra Arnold. in the mixed coniferous-broadleaf forests, occuring with Castanea sativa, in Balıkesir (Turkey). Dia...

In this study, 31 stem taper functions from three model groups (simple polynomial, segmented and variable-form stem taper models) were analysed for Bornmullerian fir (Abies nordmanniana subsp. bornmulleriana Mattf.). Diameter at breast height, total height and diameters outside bark at intervals of 1 m from the stump to the top of the tree were mea...

In this study, classical methods used to estimate biomass of forest stands the base of biological energy resources, and remote sensing methods on which many study have been done recently were explained. Furthermore, these methods were compared. It was determined that remote sensing methods are more practical than the others. Although remote sensin...