Browsing by Author "Kara, F, Topacoglu, O"

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Effects of canopy structure on growth and belowground/ aboveground biomass of seedlings in uneven-aged trojan fir stands
(2018-10-01) Kara F., Topaçoğlul O.; Kara, F, Topacoglu, O
Growth and survival of understory seedlings are infl uenced by their interactions with the environmental variables. The understanding of the relationships between stand density, canopy structure, and understory seedlings’ growth help forest managers conduct successful establishment through natural regeneration. In this study, the infl uence of stand basal area (BA) (m2.ha-1), photosynthetically active radiation transmitted through canopy (PART), leaf area index (LAI), height-to-crown base (HCB) and aspect on the root-collar diameter (RCD) (mm) growth, height growth (cm) and belowground/aboveground biomass (g) of seedlings is observed in uneven-aged Trojan fi r stands. Seedling growth and belowground/aboveground biomass models were developed for fi ve growing seasons after germination. PART, aspect and HCB were found to be the most strongly related to RCD and height growth of Trojan fi r seedlings. PART and aspect explained the most variance in belowground/aboveground biomass of the seedlings. The data also showed that the light transmitted through the canopy was the most signifi cant predictor of understory seedlings growth; thus, PART reaching understory can accelerate the development of sub-canopy layers in uneven-aged Trojan fi r stands. Although survival of Trojan fi r seedlings is usually high under canopy, results suggest that complete canopy closure should be avoided even in stands of shade-tolerant species such as Trojan fi r to increase a seedling’s vigor for its successful recruitment into middle and overstory. The fi ndings of this study will be helpful for forest managers to enhance the establishment and recruitment of Trojan fi r seedlings in uneven-aged stands.
Influence of stand density and canopy structure on the germination and growth of Scots pine (Pinus sylvestris L.) seedlings.
(2018-11-30T00:00:00Z) Kara, Ferhat, Topaçoğlu, Osman; Kara, F, Topacoglu, O
Since the natural regeneration of Scots pine forests is known to be difficult, the effects of canopy structure and environmental variables such as light on germination, seedling growth, and mortality need to be well understood. The knowledge on the relationships between canopy structure, environmental variables, and seedling growth have been helpful for forest managers to formulate silvicultural prescriptions that enhance seedling recruitment. In this study, the influences of stand basal area (BA) (m ha), leaf area index (LAI), light transmittance (LT), and height-to-crown base (HCB) on germination and seedling growth were explored in a naturally regenerated Scots pine forest in Kastamonu, Turkey. The number of germinants was observed following germination, and total root-collar diameter (RCD) and height of seedlings were monitored after five growing seasons following germination. BA, LAI, LT, and HCB were also examined to determine which variable has more influence on Scots pine seedlings. All variables (i.e., BA, LAI, LT, and HCB) had significant influence on the total seedling growth over a 5-year period. LT was the most significant predictor for total RCD growth and height growth of Scots pine seedlings. The data support the importance of light transmittance through the canopy, along with vertical canopy structure (i.e., HCB) when considering seedling development under a stand canopy.