Browsing by Author "Keleş S.Ö."

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Burn severity evaluation in black pine forests with topographical factors using Sentinel-2 in Kastamonu, Turkiye
(2023-03-27) Genç Ç.Ö.; Küçük Ö.; Keleş S.Ö.; Ünal S.
Development and anatomical traits of black pine on an abandoned agricultural land compared to forested areas
(2021-09-01) Kara F.; Keleş S.Ö.; Loewenstein E.F.
Global acreage of forested lands has increased in some countries. At least some of this increase is due to the natural conversion of abandoned agricultural lands into forests. However, little is known about how these new stands develop on abandoned agricultural lands in comparison with natural regeneration of existing forests. Specifically, knowledge of how black pine (Pinus nigra Arnold) naturally establishes and develops on abandoned agricultural lands is limited. In this study, we examined the density and growth of black pine saplings as well as some morphological and anatomical characteristics on an abandoned agricultural land (AAS). These data were compared with those observed in a naturally regenerated stand (NRS), and in a forest opening (FOS). The greatest sapling density was observed in the NRS site, while sapling growth and stem biomass were higher in AAS followed by NRS and FOS. Moreover, each study site exhibited site-specific morphological and anatomical traits in their saplings. Our findings showed that site treatments and overstory openness would both play crucial role for establishment and development of black pine.
How anatomical and morphological characteristics affect the flexural properties of two angiosperm species at the sapling stage
(2020-08-01) Keleş S.Ö.; Keles, SO
The sapling stage is an important phase due to maintaining plant growth, stability, and survival over the life cycle of trees. However, there are limited investigations in the literature related to both growth and stability of different tree species. This study thus investigated how different tree species at the sapling stage showed different anatomical, morphological, and flexural traits despite being of similar age and growing under the same environmental conditions. The variation of sapling properties was determined in two deciduous tree species: common oak (Quercus robur L.) and Oriental beech (Fagus orientalis Lipsky). The results of anatomical and morphological measurements showed that the highest average values of ray length, ray width, pith radius, pith%, bark%, and node numbers were obtained in oak saplings, whereas average ring width, number of rays, and wood% were found to be higher in beech saplings. Oak also exhibited better functional stability in its saplings. The flexural properties were almost 60% greater in oak stems than beech stems. The variations in flexural properties were explained by the morphological and anatomical traits since stability was positively correlated with pith radius, pith%, and bark% and negatively correlated with the number of rays and wood%.
How anatomical and morphological characteristics affect the flexural properties of two angiosperm species at the sapling stage
(2020-08-01) Keleş S.Ö.
The sapling stage is an important phase due to maintaining plant growth, stability, and survival over the life cycle of trees. However, there are limited investigations in the literature related to both growth and stability of different tree species. This study thus investigated how different tree species at the sapling stage showed different anatomical, morphological, and flexural traits despite being of similar age and growing under the same environmental conditions. The variation of sapling properties was determined in two deciduous tree species: common oak (Quercus robur L.) and Oriental beech (Fagus orientalis Lipsky). The results of anatomical and morphological measurements showed that the highest average values of ray length, ray width, pith radius, pith%, bark%, and node numbers were obtained in oak saplings, whereas average ring width, number of rays, and wood% were found to be higher in beech saplings. Oak also exhibited better functional stability in its saplings. The flexural properties were almost 60% greater in oak stems than beech stems. The variations in flexural properties were explained by the morphological and anatomical traits since stability was positively correlated with pith radius, pith%, and bark% and negatively correlated with the number of rays and wood%.
The effect of altitude on the growth and development of trojan fir (Abies nordmanniana subsp. equi-trojani [asch. & sint. ex boiss] coode & cullen) saplings
(2020-01-01) Keleş S.Ö.; Keles, SO
The altitude is an important factor to affect the growth and development of saplings of the tree. However, the effect of altitude on the growth and properties of wood during their young stage it has been little studied. This study, therefore, aimed to evaluate the influence of two different altitude steps: 795 m (a.s.l. low-altitude) and 1350 m (a.s.l. high altitude) on the morphological, anatomical and wood density properties of saplings of Abies nordmanniana subsp. equi-trojani [Asch. & Sint. ex Boiss] Coode & Cullen (Trojan fir). Trojan fir is an endemic species in Turkey and its morphology and anatomy have less studied in the literature. The functional traits and wood density properties differed significantly between the two altitudes. The saplings grown at low-altitude showed greater taper degree, pith radius, pith proportion, and bark proportion than high-altitude. However, stem height, stem diameter, node number, and xylem proportion were found to be higher in saplings grown at high-altitude than low-altitude. Wood cell anatomy also varied significantly between two altitudes such that ring width, ray numbers, tracheid length, and tracheid width were higher at low-altitude, whereas ray height, ray width, tracheid lumen width, and tracheid wall thickness were greater at high-altitude. This study, therefore, suggested that the growth and development of fir saplings were better when they were grown at high-altitude than low-altitude.
The effect of altitude on the growth and development of trojan fir (Abies nordmanniana subsp. equi-trojani [asch. & sint. ex boiss] coode & cullen) saplings
(2020-01-01) Keleş S.Ö.
The altitude is an important factor to affect the growth and development of saplings of the tree. However, the effect of altitude on the growth and properties of wood during their young stage it has been little studied. This study, therefore, aimed to evaluate the influence of two different altitude steps: 795 m (a.s.l. low-altitude) and 1350 m (a.s.l. high altitude) on the morphological, anatomical and wood density properties of saplings of Abies nordmanniana subsp. equi-trojani [Asch. & Sint. ex Boiss] Coode & Cullen (Trojan fir). Trojan fir is an endemic species in Turkey and its morphology and anatomy have less studied in the literature. The functional traits and wood density properties differed significantly between the two altitudes. The saplings grown at low-altitude showed greater taper degree, pith radius, pith proportion, and bark proportion than high-altitude. However, stem height, stem diameter, node number, and xylem proportion were found to be higher in saplings grown at high-altitude than low-altitude. Wood cell anatomy also varied significantly between two altitudes such that ring width, ray numbers, tracheid length, and tracheid width were higher at low-altitude, whereas ray height, ray width, tracheid lumen width, and tracheid wall thickness were greater at high-altitude. This study, therefore, suggested that the growth and development of fir saplings were better when they were grown at high-altitude than low-altitude.
Tree species richness influence productivity and anatomical characteristics in mixed fir-pine-beech forests
(2023-01-01) Kara F.; Keleş S.Ö.
Tree species richness (SR) and stand structural diversity (SSD) have general positive influences on stand productivity, while several studies highlight the remaining uncertainty in our knowledge of the relationships among productivity, species richness and structural diversity. Moreover, our knowledge about how SR influences anatomical cell characteristics is still limited. This study examined if stand productivity was influenced by SR and SSD by comparing the productivity of three forest types; (i) pure Trojan fir (Abies nordmanniana subsp. equi-trojani) forest, (ii) mixed Trojan fir-Scots pine (Pinus sylvestris L.) forest, and mixed Trojan fir-Scots pine-Oriental beech (Fagus orientalis L.) forest. Moreover, the study also monitored if SR and SSD affected the anatomical characteristics of fir trees in these forest types. Linear mixed-effect models were utilized to observe the relationships among species richness, stand characteristics and productivity. Stand density index, SR, and an interaction (SR × SSD) had significant effects on stand productivity. This was likely due to the complementary resource use among tree species in the mixed forests where more stratified canopies due to varying levels of shade tolerance and tree growth rates were present. Significant relationships between species richness and anatomical cell characteristics of fir were also explored. The findings of this study will enhance our understanding of species diversity controls in stands comprised of fir, pine and beech.