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| ŠUMARSKI LIST 5-6/2023 str. 29 <-- 29 --> PDF |
Carbon dioxide (CO2) emissions from soils during the regeneration of pedunculate oak (Quercus robur L.) stand in the summer period Emisije ugljikovog dioksida (CO2) iz tla tijekom obnove sastojine hrasta lužnjaka (Quercus robur L.) u ljetnom razdoblju Velisav Karaklić, Zoran Galić, Miljan Samardžić, Lazar Kesić, Saša Orlović, Martina Zorić Summary The loss of soil organic carbon stock and increased CO2 emission from soil are induced by various human activities. The aim of this study was to examine whether an anthropogenic influence during the regeneration of a pedunculate oak (Quercus robur L.) stand can affect the increment of CO2 emission from the soil. The research was carried out within three plots, out of which two were exposed to different degrees of anthropogenic influence. The air samples were collected using the soil respiratory chambers and analysed using the gas chromatograph Agilent 8890. Based on the obtained results, soil temperature and moisture as the most dominant drivers of the CO2 emission had different effects on the CO2 flux from soil depending on the intensity of anthropogenic influences and environmental conditions. Within the experimental plot with the significant soil alteration, a reliable positive correlation was detected for the CO2 flux with the soil temperature (r = 0.77, p < 0.05). High significant correlation was observed considering soil moisture (r = 0.85, p < 0.05) in the natural soil where the application of pesticides was conducted. The results showed that both soils that were exposed to the anthropogenic influences had notably higher values of the CO2 flux in comparison to the reference natural soil without anthropogenic impacts. Key words: CO2, pedunculate oak, anthropogenic influence, soil temperature, soil moisture INTRODUCTION UVOD Forest ecosystems play a crucial role in global carbon cycle and are highly important factor in decreasing the negative effects of the ongoing climate change (Kuznetsova et al., 2019). Net ecosystem production is defined as the difference between the amount of organic carbon that is fixed by process of photosynthesis and total ecosystem respiration (Lovett et al., 2006). Soils are the biggest carbon pools in terrestrial ecosystems (Amundson, 2001), where amount of soil organic carbon is estimated at 3 000 Pg (Köchy et al., 2015). Soil respiration reaches 55-85% of the total ecosystem respiration in various forests (Knohl et al., 2008). The total flux of carbon dioxide (CO2) from the soil is one of the largest emissions in the global carbon cycle (Wang et al., 2011), which releases 66-100 Pg C year-1 (Chiang et al., 2021). Soil respiration is divided on autotrophic respiration caused by |