Impact of sub-canopy removal on the stand-level volatile organic compounds exchange

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dc.contributor Helsingin yliopisto, Maatalous-metsätieteellinen tiedekunta, Metsätieteiden osasto fi
dc.contributor University of Helsinki, Faculty of Agriculture and Forestry, Department of Forest Sciences en
dc.contributor Helsingfors universitet, Agrikultur- och forstvetenskapliga fakulteten, Avdelningen för skogsvetenskaper sv
dc.contributor.author Ahi, Mohamadali
dc.date.issued 2020
dc.identifier.uri URN:NBN:fi:hulib-202006052605
dc.identifier.uri http://hdl.handle.net/10138/315833
dc.description.abstract Removal of sub-canopy trees is a type of forest management practice, mainly employed to minimize subsequent harvesting costs. Such management activities, however, are a source of disturbance in boreal forests, including those of Finland. The removal of understory trees causes mechanical damage to trees, with coniferous trees, such as Scots pine, being particularly susceptible. The resulting injuries significantly enhance emissions of biogenic volatile organic compounds (BVOCs) to the atmosphere, thereby modulating its gas composition. BVOCs are involved in plant growth, reproduction and defence, while functioning as communication media within and between plants. These plant-released compounds have high chemical reactivity with large mass emission rate from vegetation into the atmosphere; therefore, they are major determinants of atmospheric gas composition with important implications for the Earth’s atmosphere and climate. Despite the wealth of knowledge on this topic, our understanding of how forest management activities affect BVOC emissions is limited. Uncertainty remains as what the impact of sub-canopy removal is on BVOC emissions from forest trees over a long timescale. This is important since such management activities are common, with equal or potentially even larger impact on BVOC emissions both in the short- and long-run. To address this knowledge gap, I test the impacts of sub-canopy removal on the emissions of BVOCs from a Scots pine stand in a boreal forest. In so doing, I also consider the effects of temperature, soil moisture, and photosynthetically active radiation on the concentrations of these compounds above the canopy. The research sheds light on the complex and intertwined effects of the sub-canopy removal and environmental variables on the stand-level BVOC emissions. The results have implications regarding how forest management practices, and more broadly anthropogenic activities, influence forest-atmosphere interactions. Finally, the research provides promising avenues for future research. en
dc.language.iso eng
dc.publisher Helsingin yliopisto fi
dc.publisher University of Helsinki en
dc.publisher Helsingfors universitet sv
dc.subject Biogenic Volatile organic compounds (BVOCs)
dc.subject Sub-canopy removal
dc.subject Forest management
dc.subject Forest–atmosphere interactions
dc.title Impact of sub-canopy removal on the stand-level volatile organic compounds exchange en
dc.type.ontasot pro gradu -tutkielmat fi
dc.type.ontasot master's thesis en
dc.type.ontasot pro gradu-avhandlingar sv
dc.subject.discipline Metsien ekologia ja käyttö fi
dc.subject.discipline Forest Ecology and Management en
dc.subject.discipline skoglig ekologi och resurshushållning sv
dct.identifier.urn URN:NBN:fi:hulib-202006052605

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