Abstract

CO₂ emission to the atmosphere is the main cause of global warming. The impacts of land-use changes for agriculture and urbanisation, deforestation, and fire disturbance are attributed to the increase in CO₂ emissions. Soil respiration, largely due to microbial activity, is one of the CO₂ sources being released to the atmosphere. In this regard, several soil parameters related with carbon cycle, including organic matter, total N, C/N ratio, CO₂ efflux, microbial biomass C (C_mic), the C_mic/C_org ratio, the metabolic quotient qCO₂, and β-D glucosidase activity, were determined in a burned (harvested, H; non-harvested, NH), and its adjacent unburned (UB), mixed oak-pine forest to estimate the effects of burning and removal of residual woods. The C_mic increased gradually with burning and harvesting after Month 9, and sharp increases were observed in all areas, likely due to the abundant rainfall after Month 12. CO₂ efflux decreased in the burned areas at Months 4 and 6; however, this reversed in Month 9. In spite of non-significant differences, we detected higher CO₂ efflux values in the unburned areas compared to the burned ones, probably as a result of the drought effect observed in the burned areas up to Months 9 and 12 due to the increased soil heat. There was no significant difference between the H and NH burned areas, while both areas were different from the unburned areas in all soil parameters, except CO₂ efflux and qCO₂. The harvesting effect was not significant compared to the fire effect with regard to the considered soil variables, likely due to the management and protection of the burned area which allowed a fast vegetation recover. The abundance of the microbial biomass was independent of the changes in CO₂ efflux and showed a negative correlation with β-D glucosidase activity. This might be related to the variation in substrate quality, microbial composition and abundance after burning and harvesting.

  Keywords

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CO₂ Evolution, β-D Glucosidase Activity, qCO₂, Soil Microbial Biomass Carbon, Wildfire

Authors’ Info

Paper Info

Citation

Kaptanoglu AS, Namli A (2020). Wildfire and harvesting effects on carbon dynamics in an oak-pine mixed forest. iForest 13: 435-440. - doi: 10.3832/ifor3312-013

Academic Editor

Davide Ascoli

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© SISEF - The Italian Society of Silviculture and Forest Ecology 2020

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This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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