Despite experimental evidence showing that elevated CO2 levels increase growth in most plants, the isolation of a signal consistent with anthropogenically caused increases in atmospheric CO2 from the dendrochronological record has shown mixed results. Our extensive sets of tree ring data from the Ozark Mountains in Missouri showed that since 1850, Quercus velutina Lam., Quercus coccinea Muench....

lnvestigaltons into the nature of desiccation-sensitive, or recalcitant, seed behavior have as yet failed to identify exact causes of this phenomenon. Experiments with Quercus nigra L. and Quercus alba L. were conducted to examine physiological and biochemical changes brought about by seed desiccation and to determine if there were predictable changes in seed moisture content, m enthalpy (heat ...

Question: Landscape models of fire occurrence in ecosystems assume that the time since the last fire determines vegetation flammability by enabling the accumulation of dead biomass. In this study we ask if Mediterranean Basin shrublands respond to these models or, on the contrary, if initial successional stages in these ecosystems could be more flammable than later stages. Location: Mediterrane...

Crop rotation and fallow are management options that can be used to control plant parasitic nematodes in forest tree nurseries. Before these options can be put into practice, it is important to determine the host range and survivability under fallow of the parasitic nematode to be controlled. The results of host range tests on a needle nematode (Longidorus spp.) and a stunt nematode (Tylenchorh...

The cloud forests of Mexico have been degraded and severely fragmented, and urgently require restoration. However, progress with restoration has been constrained by a lack of information concerning the seedling ecology of native tree species. An experiment was therefore conducted to assess the influence of different environmental factors on the seedling survival and growth of four native tree s...

The nutritional composition of different acorn species (Q. pyrenaica, Q. robur, and ilex) harvested in Peneda-Gerês Park, Braga (north Portugal) was determined after being dehulled by methods (manually, thermally scalding with boiling water, drying at 30 °C). Ash protein contents remained unaltered, but the fat carbohydrate increased and/or decreased depending on dehulling method Quercus spp. t...

Abstract The biological deterioration of archaeological wood under oxygen-limited conditions varies due to the limited activities microorganisms. It is essential expand knowledge degradation types and status monuments for selecting proper consolidates. physical, chemical, anatomical properties approximately 600–650 year old oak collected from an site in Iasi-Romania were analysed assess quality...