Yazar "Özdemir, Emrah" seçeneğine göre listele
Listeleniyor 1 - 6 / 6
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Arthropod diversity in pure oak forests of coppice origin in northern Thrace (Turkey)(Sisef-Soc Italiana Selvicoltura Ecol Forestale, 2015) Keten, Akif; Beşkardeş, Vedat; Kumbaşlı, Meriç; Makineci, Ender; Zengin, Hayati; Özdemir, Emrah; Anderson, James T.Oak (Quercus spp.) forests are among the most important forest types in Turkey. In the past, oak forests were managed through coppice clear-cutting, but in recent decades they have mostly been converted to high forest. This study was aimed at explaining how arthropod diversity is affected during conversion from coppice to high oak forest and during the early stages of coppice succession. We tested the hypothesis that arthropod richness, abundance and diversity in coppice oak sites varied according to stand age and a number of other forest characteristics. Arthropod communities were sampled in 50 plots using four different methods: pitfall traps, sweep nets, sticky cards and cloth shaking. A total of 13 084 individuals were collected and classified into 193 Recognizable Taxonomic Units (RTUs), with the most RTUs and the greatest number of specimens captured by sweep netting. We identified 17 taxa within RTU's with more than 1% of the captured arthropods, which constituted 75% of the total specimens. The number of RTUs varied significantly according to trap type. Arthropod richness and Shannon-Wiener biodiversity index (H') increased with elevation and precipitation. In young (1-40 yrs-old) and middle-aged (4180 yrs) stands, arthropod biodiversity was not significantly affected by stand type, but slightly increased with diameter at breast height and tree height. Forest characteristics, such as the litter layer, understory and crown diameter, weakly influenced arthropod richness and abundance. Cluster analysis revealed that stand types and trap types differed taxonomically. Principal component analysis showed that stand types were clearly separated by the stand parameters measured. Insect families (Formicidae, Thripidae, Lygaeidae, Dolichopodidae, Luaxanidae, Cicadellidae and Ichneumonidae) could potentially be used as indicators of coppice oak conditions. As the coppice oak changes to mature forest, further studies are needed to better assess the relation between arthropods, forest types and structural characteristics of stands.Öğe Biomass estimation of individual trees for coppice-originated oak forests(Springer, 2019) Özdemir, Emrah; Makineci, Ender; Yılmaz, Ersel; Kumbaşlı, Meriç; Çalışkan, Servet; Beşkardeş, Vedat; Yılmaz, HaticeIn this study, individual tree-biomass equations are developed for the different biomass components (foliage, branch, bark, stem, and total aboveground biomass) of Quercus frainetto Ten., Quercus cerris L., and Quercus petraea (Matt.) Liebl. species, which are the main oak species in coppice-originated oak forests. This research was conducted in northern Turkish Thrace, an important coppice-oak area. A total of 474 oak trees at different development stages over different sites were destructively sampled to obtain biomass models of the major oak species in the region. Two main biomass models are established to estimate the biomass components: according to the diameter at breast height (DBH) alone and according to the d(2)h variable, which is the combined DBH and tree height. The goodness-of-fit statistics of the models are calculated to compare these models. The models that use the DBH alone as an independent variable explain 68-95% of the variation in the biomass of the tree components. After adding the tree height to the model, the accuracy for the bark-, stem-, and total aboveground-biomass estimates increased, while the accuracy of the foliage- and branch-biomass estimates decreased. Different oak species have different biomass components depending on their development stages. The amount of biomass components in the total aboveground biomass and foliage decreased from 20% (SDF) to 4% (LDF), the amount of bark decreased from 17% (SDF) to 12% (LDF), and the amount of stems increased from 42% (SDF) to 66% (LDF) when increasing the mean DBH of the sample plots.Öğe Ecosystem carbon pools of coppice-originated oak forests at different development stages(Springer, 2015) Makineci, Ender; Özdemir, Emrah; Çalışkan, Servet; Yılmaz, Ersel; Kumbaşlı, Meriç; Keten, Akif; Yılmaz, HaticeThe carbon (C) pools of aboveground tree components (leaf, stem, branch, and stem bark), ground cover, organic, and mineral soil were examined and compared with three stand development stages based on the mean tree diameters [diameter at breast height (dbh) in which small-diameter forests (SDF) = 0-8 cm, medium-diameter forests (MDF) = 8-20 cm, and large-diameter forests (LDF) = 20-36 cm] in pure coppice-originated oak stands located in the northwestern Turkey. In tree components, only the stem C concentration differed significantly among the development stages. The total C pools of the total tree biomass changed between 13 and 89 Mg ha(-1) from SDF to LDF. The C content of tree biomass was strongly correlated with dbh (R (2) = 0.83). The C contents of the ground cover differed significantly while the C contents in both organic soil layers were also markedly different and increased from SDF to LDF. The amount of C stored in the soil pedon was 84, 123, and 103 Mg ha(-1), and the total ecosystem (without belowground tree parts) C pools were 97, 177, and 192 Mg ha(-1), for the SDF, MDF, and LDF, respectively. Total ecosystem C content was significantly correlated (R (2) = 0.46) with dbh despite soil pedon C showed very weak correlation. The ratio between the C pool of the total aboveground tree components and total ecosystem C was 13 % in the SDF, 30 % in the MDF, and 46 % in the LDF. These results show that the soil was the main pool of C in the forests for all of the development stages.Öğe Effects of parent material, stand type and oak species on defoliation of coppice-originated oak (Quercus spp.) forests in Northern Turkish Thrace(Univ Austral Chile, Fac Ciencias Forestales, 2017) Kumbaşlı, Meriç; Makineci, Ender; Keten, Akif; Beşkardeş, Vedat; Özdemir, EmrahCases of significant defoliation in oak (Quercus spp.) forests have been reported in Turkey and throughout the world. Oak trees are important in Turkish forests and forestry and cover vast pieces of land in Thrace. In this study, in a quest to determine the general health condition of pure oak forests in Northern Turkish Thrace, the defoliation rate of tree crowns was evaluated for 8,769 trees in 336 sample plots corresponding to different geological parent materials, regions, oak species and stand types. The defoliation rates were designated and assessed based on the criteria of the European Union Forest Health Monitoring Program (UNECE-ICP Forests). The defoliation rate was, to a significant extent, affected by stand type, the geological parent material, and oak species. In general, 47 % of trees exhibited defoliation. The highest ratio of defoliation was found in Kirklareli Region, where water deficit was the highest, and the parent material was schist-calcschist. Medium diameter forests (MDF, mean dbh: 8-20 cm, ratio of defoliated trees = 65 %) among stand types, and sessile oaks (ratio of defoliated trees = 53 %) among oak species, had the highest defoliation rates. Achieved results demonstrated that the defoliation classes in observed oak stands have a significant relation with variables concerning stand types, oak species and geological parent materials.Öğe Farklı Boyutlarda Toplarla Yapılan Antrenmanların Top Sürme, Pas Verme ve Şut Atma Becerileri Üzerindeki Etkisi(İbrahim ERDEMİR, 2018) Kardaş, Nurgül Tezcan; Özdemir, Emrah; Kurt, Ayşenur; Altunyuva, Mert CanAraştırmamızda farklı boyutlardaki toplarla çalışmanın futbol becerileri üzerine olan etkisinin incelenmesi amaçlanmıştır. Araştırmamızda çalışma grubu (ÇG; n=12) ve kontrol grubu (KG; n=12) sporcuları futbol eğitimi alan sporculardan oluşturulmuştur. Araştırmamızda ÇG yer alan sporculara ısınmadan hemen sonra 8 hafta süresince hafta da 3 gün yaklaşık 70 dakika olacak şekilde farklı boyutlardaki toplarla (hentbol, tenis, pilates) kolaydan zora uygulanırken, KG sporcuları klasik antrenman programlarına devam etmişlerdir. Belirlenen program dahilinde çalışmaya katılan tüm sporcuların antrenman programına başlamadan önce ön testleri, 8 haftalık antrenman programı sonrasında ise son test ölçümleri alınmıştır. Ön ve son testler aynı ekip tarafından aynı yerde yapılmıştır. Testlerde Mor– Christian genel yetenek futbol testi (Top Sürme, Pas Verme, Şut Çekme) yapılarak elde edilen verilerin istatistiksel analizi SPSS paket programında yapılmıştır. Elde edilen bulgular neticesinde çalışma ve kontrol grubu arasında anlamlı bir farklılık bulunamazken (p>0,05), çalışma grubu sporcuları gelişim göstermiştir (p<0,05). Sonuçta bu tür farklılık öğrenme çalışmalarında beceri olgusunun kişiler arasında kavrama açısından zaman alabileceği bu bakımdan erken yaşlarda antrenman programlarının içinde daha uzun süreler yer alması ile daha net sonuçlar vereceği ve genç futbolcuların teknik beceri performansları üzerinde gelişim göstereceği düşünülmektedir.Öğe Lupeol'un erkek sıçanlarda akut egzersize bağlı oksidatif stres üzerine koruyucu etkileri(Düzce Üniversitesi, 2023) Özdemir, Emrah; Çoknaz, HakkıAkut egzersiz, özellikle yüksek şiddette yapıldığı zaman oksijen tüketimini artırması sebebiyle serbest radikal üretiminde artışa yol açmaktadır. Lupan tip triterpen yapısındaki, Lupeol antioksidan antikanser ve antiinflamatuvar etkilerinin yanısıra, serbest radikalleri inhibe edici özelliği ile bilinmektedir. Bu çalışmanın amacı, lupeol'un erkek sıçanlarda akut egzersize bağlı oksidatif stres üzerine koruyucu etkilerinin belirlenmesidir. Araştırmamızda 6 aylık, 200±250 g. ağırlığında 24 adet Spraque Dawley cinsi sıçanlar kullanılmıştır. Deney hayvanları rastgele yöntem ile seçilerek kontrol, egzersiz, lupeol ve egzersiz + lupeol olarak dört gruba ayrılmıştır. Araştırma sonrası deney hayvanları sakrifiye (servikal dislokasyon) edildikten sonra alınan kan örneklerinde; enzimatik antioksidanlar, (SOD),(CAT), (MDA); nonenzimatik grup, (GPx), koenzim Q10 ve a-lipoik asit enzimlerinin düzeyleri ve serum örneklerindeki oksidatif stres düzeyleri ELISA yöntemiyle ölçülmüştür. Analiz sonuçları istatistik programı ile grupların tüm analizleri yapılmış anlamlılık düzeyi p<0,05 olarak kabul edilmiştir. Sonuç olarak; Lupeol'un vücudun üretmiş olduğu antioksidan seviyesine olumlu yönde katkıda bulunduğu ve oksidanları baskılamada yardımcı olduğu tespit edilmiş olup, yüksek şiddetli egzersiz sonucu ortaya çıkan oksidatif stres kaynaklı serbest radikallerin lupeol tarafından azaltıldığı gözlemlenmiştir. Buna bağlı olarak oksidatif strese maruz kalan deney hayvanlarında egzersizde lupeol kullanımı, stresten oluşan serbest radikalleri inhibe ettiği, çalışmanın hipotezinin destekler nitelikte olduğu tespit edilmiştir. Anahtar Sözcükler: Lupeol, Sıçan, Egzersiz, Oksidatif Stres, Serbest Radikal
