Quercus pubescens
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The objective of the study was to evaluate changes in microbial communities with the predicted arrival of new species to Mediterranean forests under projected intensification of water stress conditions. For that, litter from three Mediterranean forests dominated respectively by Quercus pubescens Willd., Quercus ilex L. and Pinus halepensis Mill. were collected, and placed to their 'home' forest but also to the two other forests under natural and amplified drought conditions (i.e. rainfall reduction of 30%). Quantitative PCR showed that overall, actinobacteria and total bacteria were more abundant in Q. pubescens and Q. ilex than in P. halepensis litter. However, the abundance of both groups was dependent on the forest sites: placement of allochthonous litter to Q. pubescens and P. halepensis forests (i.e. P. halepensis and Q. pubescens, respectively) increased bacterial and fungal abundances, while no effect was observed in Q. ilex forest. P. halepensis litter in Q. pubescens and Q. ilex forests significantly reduced actinobacteria (A/F) and total bacteria (B/F) to fungi ratios. The reduction of rainfall did not influence actinobacteria and bacteria but caused an increase of fungi. As a result, a reduction of A/F ratio is expected with the plant community change towards the dominance of spreading P. halepensis under amplified drought conditions.
- MeSH
- Bacteria klasifikace izolace a purifikace MeSH
- borovice mikrobiologie MeSH
- dub (rod) mikrobiologie MeSH
- houby klasifikace izolace a purifikace MeSH
- lesy MeSH
- listy rostlin mikrobiologie MeSH
- mikrobiota MeSH
- období sucha MeSH
- voda MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
In the Mediterranean ecosystem, wildfires are very frequent and the predicted future with a probable increase of fires could drastically modify the vegetation scenarios. Vegetation fires are an important source of gases and primary emissions of fine carbonaceous particles in the atmosphere. In this paper, we present gaseous and particulate emissions data from the combustion of different plant tissues (needles/leaves, branches and needle/leaf litter), obtained from one conifer (Pinus halepensis) and one deciduous broadleaf tree (Quercus pubescens). Both species are commonly found throughout the Mediterranean area, often subject to wildfires. Experiments were carried out in a combustion chamber continuously sampling emissions throughout the different phases of a fire (pre-ignition, flaming and smoldering). We identified and quantified 83 volatile organic compounds including important carcinogens that can affect human health. CO and CO2 were the main gaseous species emitted, benzene and toluene were the dominant aromatic hydrocarbons, methyl-vinyl-ketone and methyl-ethyl-ketone were the most abundant measured oxygenated volatile organic compounds. CO2 and methane emissions peaked during the flaming phase, while the peak of CO emissions occurred during the smoldering phase. Overall, needle/leaf combustion released a greater amount of volatile organic compounds into the atmosphere than the combustion of branches and litter. There were few differences between emissions from the combustion of the two tree species, except for some compounds. The combustion of P. halepensis released a great amount of monoterpenes as α-pinene, β-pinene, p-cymene, sabinene, 3-carene, terpinolene and camphene that are not emitted from the combustion of Q. pubescens. The combustion of branches showed the longest duration of flaming and peak of temperature. Data presented appear crucial for modeling with the intent of understanding the loss of C during different phases of fire and how different typologies of biomass can affect wildfires and their speciation emissions profile.
- MeSH
- biomasa MeSH
- borovice chemie MeSH
- cévnaté rostliny chemie MeSH
- dub (rod) chemie MeSH
- látky znečišťující vzduch analýza MeSH
- monoterpeny analýza MeSH
- pevné částice analýza MeSH
- plyny analýza MeSH
- požáry v divočině * MeSH
- prach analýza MeSH
- stromy chemie MeSH
- těkavé organické sloučeniny analýza MeSH
- terpeny analýza MeSH
- Publikační typ
- časopisecké články MeSH
... ARSENICOSUM 131 -- CUPRUM METALLICUM 132 -- CUPRUM OXYDATUM 134 -- CYCLAMEN EUROPAEUM 135 -- CYPRIPEDIUM PUBESCENS ... ... SPINOSA 360 -- PSORINUM 361 -- PTELEA 366 -- PULSATILLA 367 -- PYROGENIUM 372 -- QUEBRACHO 374 -- QUERCUS ...
501 s. ; 22 cm