National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Emissions of isoprene by oil palm and their impacts on climate and composition of the atmosphere
Palouš, Daniel ; Albrechtová, Jana (advisor) ; Ponert, Jan (referee)
Biogenic volatile organic compounds (BVOC) serve many physiological and ecophysiological functions in plants, e.g. abiotic or biotic stress protection or signalling. Emission capacity and spectrum of emitted BVOC vary between plant species. Isoprene, having the highest global annual emission among all BVOC, has considerable influence on atmospheric chemistry and its processes. Isoprene contributes to secondary organic aerosol formation. Under specific conditions reaction of isoprene and NOx may lead to ground-level ozone formation. Isoprene also affects oxidative capacity of the atmosphere. Oil palm (Elaeis guineensis Jacq.) is a rapidly expanding crop and it is a strong isoprene emitter. Most of the global cultivation of oil palm is located in a relatively small region in southeast Asia posing a risk to regional air quality. To prevent ground-level ozone formation, keeping ground-level NOx concentrations low in the regions of oil palm cultivation is crucial. Models of global isoprene emission vary greatly and not all of them take oil palm cultivation in account. The present thesis aims to cover current knowledge on physiological functions of isoprene's synthesis and emission with regard to oil palm cultivation and ecological implications of mentioned processes. The thesis includes also brief...
Tvorba terpenoidů u buku lesního v podmínkách zvýšené koncentrace CO2 a UV záření.
Pernicová, Natálie
Plants release a wide spectrum of biogenic volatile organic compounds into the envi-ronment. These compounds attract pollinators and can protect plants against pests and/or biotic and abiotic stresses. I have investigated the impact of different UV radiation in-tensities and elevated atmospheric CO2 concentrations on the content of terpenoids in the leaves of European beech during the vegetation season. The trees were growing un-der the elevated (EC; 700 ppm) and ambient CO2 concentration (AC; 400 ppm) and at three UV radiation intensities - ambient (UVamb), enhanced (150 %; UV+), and excluded (UV–). The results show that AC trees had higher content of monoterpenes than EC trees during the whole vegetation season. Limonene and 2-bornene were found to be the most abundant monoterpenes located in the beech leaves. The highest content of 2-bornene was found in AC plants cultivated under UV– radiation. The contents of α-pinene gradually decreased during the vegetation season, while the content of limonene was increasing.Formula clause:
Emissions of isoprene by oil palm and their impacts on climate and composition of the atmosphere
Palouš, Daniel ; Albrechtová, Jana (advisor) ; Ponert, Jan (referee)
Biogenic volatile organic compounds (BVOC) serve many physiological and ecophysiological functions in plants, e.g. abiotic or biotic stress protection or signalling. Emission capacity and spectrum of emitted BVOC vary between plant species. Isoprene, having the highest global annual emission among all BVOC, has considerable influence on atmospheric chemistry and its processes. Isoprene contributes to secondary organic aerosol formation. Under specific conditions reaction of isoprene and NOx may lead to ground-level ozone formation. Isoprene also affects oxidative capacity of the atmosphere. Oil palm (Elaeis guineensis Jacq.) is a rapidly expanding crop and it is a strong isoprene emitter. Most of the global cultivation of oil palm is located in a relatively small region in southeast Asia posing a risk to regional air quality. To prevent ground-level ozone formation, keeping ground-level NOx concentrations low in the regions of oil palm cultivation is crucial. Models of global isoprene emission vary greatly and not all of them take oil palm cultivation in account. The present thesis aims to cover current knowledge on physiological functions of isoprene's synthesis and emission with regard to oil palm cultivation and ecological implications of mentioned processes. The thesis includes also brief...

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