Erkan Neşat, Güner Şükrü Teoman, Aydın Ali Cem
Faculty of Forestry, Bursa Technical University, 16310, Bursa, Turkey.
Department of Forestry, Ulus Vocational School, Bartın University, Ulus, 74600, Bartın, Turkey.
Carbon Balance Manag. 2023 Mar 30;18(1):6. doi: 10.1186/s13021-023-00226-0.
The purpose of this study was to investigate the effects of thinning on stand growth, carbon (C) sequestration, and soil properties in Brutia pine (Pinus brutia Ten.) plantations. The study was conducted at two experimental sites -the Antalya-Kaş and Isparta-Eğirdir plantation areas- in Turkey between 1985 and 2015. Different thinning intensities -unthinned (control), moderate, and heavy- were replicated in four blocks. We determined the C in the living biomass, litter, soil, and some soil features for each experimental parcel.
We found no statistically significant difference in total stand volume between thinning-intensity treatments 30 years after thinning. This may be due to more light availability and less competition between trees and faster tree-diameter growth rate after thinning, thus explaining the volume in the treated parcels compared to the control over time. The C stocks in the biomass, litter, and soil were not significantly influenced by the thinning intensity. The nutrients in the litter and soil, and other soil properties, were not significantly different among thinning parcels. This implies that the C and other nutrients in the litter and soil are related to the stand volume and biomass, which were not changed by thinning in time.
This finding is important in terms of showing that there was no change in total stand volume by thinning, which has been debated in the literature. This information is useful for forest managers when determining thinning strategy.
本研究旨在调查疏伐对土耳其火炬松（Pinus brutia Ten.）人工林林分生长、碳固存和土壤性质的影响。该研究于1985年至2015年期间在土耳其的两个试验地点——安塔利亚-卡斯和伊斯帕尔塔-埃吉尔迪尔种植区进行。不同的疏伐强度——未疏伐（对照）、中度和重度——在四个区块中重复设置。我们测定了每个试验地块活生物量、凋落物、土壤中的碳以及一些土壤特征。
疏伐30年后，我们发现疏伐强度处理之间的林分总体积没有统计学上的显著差异。这可能是由于疏伐后树木之间的光照更多、竞争更少以及树木直径生长速度更快，从而解释了随着时间推移，与对照相比，处理地块中的蓄积量情况。生物量、凋落物和土壤中的碳储量并未受到疏伐强度的显著影响。疏伐地块之间的凋落物和土壤中的养分以及其他土壤性质没有显著差异。这意味着凋落物和土壤中的碳及其他养分与林分蓄积量和生物量有关，而这些并未因疏伐而随时间发生变化。
这一发现对于表明疏伐不会改变林分总体积这一点很重要，这一点在文献中一直存在争议。该信息在森林管理者确定疏伐策略时很有用。
