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Caracterização e avaliação de germoplasma de Opuntia spp. - Resultados prelimin...
Reis, C.M.G.; Ribeiro, M.M.A.; Gazarini, L.C.As espécies do género Opuntia spp. encontram-se na paisagem e em sistemas agrícolas de muitas regiões do mundo, apesar do seu centro de origem se situar no continente americano. Apresentam um elevado potencial de produção de biomassa com consumo de água muito baixo por serem plantas CAM (metabolismo ácido das crassuláceas). São, portanto, plantas tolerantes à seca e crescem em condições semiáridas. Num mundo em...
Cork oak (Quercus suber L.) seedlings acclimate to elevated
Vaz. M; Cochard. H; Gazarini. L; Graça. J; Chaves. M. M; Pereira. J. SLeaf gas-exchange, leaf and shoot anatomy, wood density and hydraulic conductivity were investigated in seedlings of Quercus suber L. grown for 15 months either at elevated (700 lmol mol-1) or normal (350 lmol mol-1) ambient atmospheric CO2 concentrations. Plants were grown in greenhouses in a controlled environment: relative humidity 50% (±5), temperature similar to external temperature and natural light condi...
Biomass and nutrient dynamics in Mediterranean seasonal dimorphic
Simões, M.P.; Madeira, M.; Gazarini, L.To analyze biomass and nutrient dynamics of Mediterranean seasonal dimorphic shrubs, aboveground biomass (AGB) and belowground biomass (BGB), litterfall (LF), aboveground net annual primary production (ANPP), and nutrient allocation and turnover were estimated in Cistus salviifolius and C. ladanifer, during two years, in southern Portugal. AGB, BGB, LF, and ANPP of C. salviifolius are within the range reported ...
Comparison of Biomass and Nutrient Dynamics Between an Invasive and a Native Sp...
Neves, J. P.; Simões, M.P.; Ferreira, L. F.; Madeira, M.; Gazarini, L. C.Two saltmarsh species, the native Arthrocnemum macrostachyum (AM) and the invasive Spartina densiflora (SD), were compared in terms of monthly variation of above and belowground biomass, and nutrient (N, P, K, Ca, Mg, Mn) concentrations, over 1 year, in Castro Marim saltmarsh, Portugal. Net aboveground primary productivity was also estimated by two different methods. Above and belowground biomass were higher in...
Drought-induced photosynthetic inhibition and autumn recovery in two Mediterran...
Vaz, M.; Pereira, J.S.; Gazarini, L.C.; David, T.S.; David, J.S.; Rodrigues, A; Maroco, J; Chaves, M.M.Responses of leaf water relations and photosynthesis to summer drought and autumn rewetting were studied in two evergreen Mediterranean oak species, Quercus ilex spp. rotundifolia and Quercus suber. The predawn leaf water potential (ΨlPD), stomatal conductance (gs) and photosynthetic rate (A) at ambient conditions were measured seasonally over a 3-year period. We also measured the photosynthetic response to lig...
Ability of Cistus L. shrubs to promote soil rehabilitation in extensive oak woo...
Simões, M. Paula; Madeira, M.; Gazarini, L.To assess the ecological function of Cistus salviifolius (CS) and C. ladanifer (CL) shrubs in evergreen oak woodlands, a study was conducted over a 4-year period in southern Portugal. Annual potential return of bio-elements to the soil through litterfall and throughfall, and necromass on soil surface under shrub canopies were assessed along with the dynamics of leaf litter decomposition. Soil bulk density and s...
Water-use strategies in two co-occurring Mediterranean evergreen oaks: survivin...
David, T.S.; Henriques, M.O.; Kurz-Besson, C.; Nunes, J.; Valente, F.; Vaz, M,; Pereira, J.S.; Siegwolf, R.; Chaves, M.M.; Gazarini, L.C.; David, J,S.In the Mediterranean evergreen oakwoodlands of southern Portugal, the main tree species are Quercus ilex ssp. rotundifolia Lam. (holm oak) and Quercus suber L. (cork oak). We studied a savannah-type woodland where these species coexist, with the aim of better understanding the mechanisms of tree adaptation to seasonal drought. In both species, seasonal variations in transpiration and predawn leaf water potentia...
Aerodynamic conductances in a sparse mixed oak woodland (Quercus rotundifolia L...
Pereira, F.L.; Valente, F.; Gazarini, L.C.; David, J.S.The study of heat and mass exchange between the vegetation and its local environment plays a central role in the analysis of plant-atmosphere interactions. These studies can be undertaken at different scales, ranging from individual leaves to isolated trees or even the canopy scale. In each of these cases, heat and mass fluxes depend on the use of adequate values of transfer conductances. Within a broader study...
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