Impacts of Climate Change Induced Vegetation Responses on BVOC Emissions from Subarctic Heath Ecosystems

Research output: Book/ReportPh.D. thesisResearch

Standard

Impacts of Climate Change Induced Vegetation Responses on BVOC Emissions from Subarctic Heath Ecosystems. / Valolahti, Hanna Maritta.

Department of Biology, Faculty of Science, University of Copenhagen, 2015. 145 p.

Research output: Book/ReportPh.D. thesisResearch

Harvard

Valolahti, HM 2015, Impacts of Climate Change Induced Vegetation Responses on BVOC Emissions from Subarctic Heath Ecosystems. Department of Biology, Faculty of Science, University of Copenhagen.

APA

Valolahti, H. M. (2015). Impacts of Climate Change Induced Vegetation Responses on BVOC Emissions from Subarctic Heath Ecosystems. Department of Biology, Faculty of Science, University of Copenhagen.

Vancouver

Valolahti HM. Impacts of Climate Change Induced Vegetation Responses on BVOC Emissions from Subarctic Heath Ecosystems. Department of Biology, Faculty of Science, University of Copenhagen, 2015. 145 p.

Author

Valolahti, Hanna Maritta. / Impacts of Climate Change Induced Vegetation Responses on BVOC Emissions from Subarctic Heath Ecosystems. Department of Biology, Faculty of Science, University of Copenhagen, 2015. 145 p.

Bibtex

@phdthesis{9d31a651f02142f387a69bfd3ad80849,
title = "Impacts of Climate Change Induced Vegetation Responses on BVOC Emissions from Subarctic Heath Ecosystems",
abstract = "The role of biogenic volatile organic compounds (BVOCs) affecting Earths’ climate system is oneof the greatest uncertainties when modelling the global climate change. BVOCs presence in theatmosphere can have both positive and negative climate feedback mechanisms when they involveatmospheric chemistry and physics.Vegetation is the main source of BVOCs. Their production is directly linked to temperature and thefoliar biomass. On global scale, vegetation in subarctic and arctic regions has been modeled to haveonly minor contribution to annual total BVOC emissions. In these regions cold temperature hasbeen regulating annual plant biomass production, but ongoing global warming is more pronouncedin these regions than what the global average is. This may increase the importance of subarctic andarctic vegetation as a source of BVOC emissions in near future.This thesis aims to increase the understanding of the controls of BVOC emissions from subarcticecosystems under climate change by studying the responses to long-term manipulations from leaflevel to small ecosystem scale. Leaf-level studies showed different anatomical responses forwarming and shading manipulations between studied species, but no significant effects on BVOCemissions on plant individual level were found. The lack of changes in BVOC emissions after longtermexposure could be at least partially explained by long term-acclimation, which is supported bythe observed anatomy responses. Whereas warming was not found to alter the BVOC emissions onplant individual level, emissions from ecosystem level was found to increase significantly.Anatomical acclimations and decrease in BVOC emissions on plant individual level have probablybeen compensated for by rapidly increasing foliar biomass on ecosystem level and have lead toincreases in total BVOC emissions from subarctic ecosystems.Ecosystem level emissions showed two-fold increase in monoterpene emissions and over five-foldincrease in sesquiterpene emissions after a decade of warming. These increases were probablydriven by the changes in vegetation composition. Increased autumnal leaf litter amount simulatedby litter addition experiment was found to increase the plant biomass production, probably due toincreased soil nutrient availability. The observed increase in BVOC emissions from litter additiontreatment was therefore partially explained by increasing plant biomass and partially by increasingamount of BVOCs released from the decomposing litter.According to the results presented in this thesis, I suggest the pronounced increase of BVOCemissions found after long-term exposure to climate manipulations is mainly carried indirectly viavegetation changes. Climate manipulations used in this study increased the ecosystem-scale BVOCemissions, supporting the prediction of increasing importance of subarctic regions for global BVOCemissions in near future.",
author = "Valolahti, {Hanna Maritta}",
note = "CENPERM[2015]",
year = "2015",
language = "Dansk",
publisher = "Department of Biology, Faculty of Science, University of Copenhagen",

}

RIS

TY - BOOK

T1 - Impacts of Climate Change Induced Vegetation Responses on BVOC Emissions from Subarctic Heath Ecosystems

AU - Valolahti, Hanna Maritta

N1 - CENPERM[2015]

PY - 2015

Y1 - 2015

N2 - The role of biogenic volatile organic compounds (BVOCs) affecting Earths’ climate system is oneof the greatest uncertainties when modelling the global climate change. BVOCs presence in theatmosphere can have both positive and negative climate feedback mechanisms when they involveatmospheric chemistry and physics.Vegetation is the main source of BVOCs. Their production is directly linked to temperature and thefoliar biomass. On global scale, vegetation in subarctic and arctic regions has been modeled to haveonly minor contribution to annual total BVOC emissions. In these regions cold temperature hasbeen regulating annual plant biomass production, but ongoing global warming is more pronouncedin these regions than what the global average is. This may increase the importance of subarctic andarctic vegetation as a source of BVOC emissions in near future.This thesis aims to increase the understanding of the controls of BVOC emissions from subarcticecosystems under climate change by studying the responses to long-term manipulations from leaflevel to small ecosystem scale. Leaf-level studies showed different anatomical responses forwarming and shading manipulations between studied species, but no significant effects on BVOCemissions on plant individual level were found. The lack of changes in BVOC emissions after longtermexposure could be at least partially explained by long term-acclimation, which is supported bythe observed anatomy responses. Whereas warming was not found to alter the BVOC emissions onplant individual level, emissions from ecosystem level was found to increase significantly.Anatomical acclimations and decrease in BVOC emissions on plant individual level have probablybeen compensated for by rapidly increasing foliar biomass on ecosystem level and have lead toincreases in total BVOC emissions from subarctic ecosystems.Ecosystem level emissions showed two-fold increase in monoterpene emissions and over five-foldincrease in sesquiterpene emissions after a decade of warming. These increases were probablydriven by the changes in vegetation composition. Increased autumnal leaf litter amount simulatedby litter addition experiment was found to increase the plant biomass production, probably due toincreased soil nutrient availability. The observed increase in BVOC emissions from litter additiontreatment was therefore partially explained by increasing plant biomass and partially by increasingamount of BVOCs released from the decomposing litter.According to the results presented in this thesis, I suggest the pronounced increase of BVOCemissions found after long-term exposure to climate manipulations is mainly carried indirectly viavegetation changes. Climate manipulations used in this study increased the ecosystem-scale BVOCemissions, supporting the prediction of increasing importance of subarctic regions for global BVOCemissions in near future.

AB - The role of biogenic volatile organic compounds (BVOCs) affecting Earths’ climate system is oneof the greatest uncertainties when modelling the global climate change. BVOCs presence in theatmosphere can have both positive and negative climate feedback mechanisms when they involveatmospheric chemistry and physics.Vegetation is the main source of BVOCs. Their production is directly linked to temperature and thefoliar biomass. On global scale, vegetation in subarctic and arctic regions has been modeled to haveonly minor contribution to annual total BVOC emissions. In these regions cold temperature hasbeen regulating annual plant biomass production, but ongoing global warming is more pronouncedin these regions than what the global average is. This may increase the importance of subarctic andarctic vegetation as a source of BVOC emissions in near future.This thesis aims to increase the understanding of the controls of BVOC emissions from subarcticecosystems under climate change by studying the responses to long-term manipulations from leaflevel to small ecosystem scale. Leaf-level studies showed different anatomical responses forwarming and shading manipulations between studied species, but no significant effects on BVOCemissions on plant individual level were found. The lack of changes in BVOC emissions after longtermexposure could be at least partially explained by long term-acclimation, which is supported bythe observed anatomy responses. Whereas warming was not found to alter the BVOC emissions onplant individual level, emissions from ecosystem level was found to increase significantly.Anatomical acclimations and decrease in BVOC emissions on plant individual level have probablybeen compensated for by rapidly increasing foliar biomass on ecosystem level and have lead toincreases in total BVOC emissions from subarctic ecosystems.Ecosystem level emissions showed two-fold increase in monoterpene emissions and over five-foldincrease in sesquiterpene emissions after a decade of warming. These increases were probablydriven by the changes in vegetation composition. Increased autumnal leaf litter amount simulatedby litter addition experiment was found to increase the plant biomass production, probably due toincreased soil nutrient availability. The observed increase in BVOC emissions from litter additiontreatment was therefore partially explained by increasing plant biomass and partially by increasingamount of BVOCs released from the decomposing litter.According to the results presented in this thesis, I suggest the pronounced increase of BVOCemissions found after long-term exposure to climate manipulations is mainly carried indirectly viavegetation changes. Climate manipulations used in this study increased the ecosystem-scale BVOCemissions, supporting the prediction of increasing importance of subarctic regions for global BVOCemissions in near future.

UR - https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122943887205763

M3 - Ph.d.-afhandling

BT - Impacts of Climate Change Induced Vegetation Responses on BVOC Emissions from Subarctic Heath Ecosystems

PB - Department of Biology, Faculty of Science, University of Copenhagen

ER -

ID: 150342640