Báo cáo lâm nghiệp: "Stomatal response of Quercus pyrenaica Willd to environmental factors in two sites differing in their annual rainfall (Sierra de Gata, Spain)" potx

... to environmental factors in two sites differing in their annual rainfall (Sierra de Gata, Spain) M Rico, HA Gallego, G Moreno, I Santa Regina Instituto de Recursos Naturales ... semi-empirical model of stom- atal conductance was used to improve understanding of the sensitivity to water deficit in deciduous oak species, in contr...

Ngày tải lên: 08/08/2014, 18:21

... of various com- positions indicated that peak b (Fig. 3) corresponded to P-choline above pH 7.5, indicating that P-choline accumulated in the cytoplasnnic compartment. Finally, since ... polar lipid deacylation products, such as P-choline. During this stage, the cell respiration rates declined as a consequence of the de- crease in the number of...

Ngày tải lên: 09/08/2014, 04:20

... composition are dependent on the ecological demands of the individual species. Some of them increase or, on the contrary, decrease their dominance and abundance with increasing altitude. Otiorhynchus ... of the species Hypera meles, Polydrusus pilosus, P. cervinus and Platyrhinus resinosus is im- possible to determine de nitely with regard to a small number of found specim...

Ngày tải lên: 07/08/2014, 03:22

... been a renewed interest in examining all phases of nursery culture and seed 1 factors with a view to improving yields in the nursery. Seeds of alder and birch often germinate poorly in the nursery, ... the benefits of priming loblolly pine (Pinus taeda L.) seeds decreased as the length of chilling increased. In contrast to the FI seeds, priming had a small effect on the ge...

Ngày tải lên: 07/08/2014, 16:21

... disturbance-dependent recruit- ment species: immediate post-fire, according to the classifica- tion of Keeley [21]. In order to include Q. pyrenaica in one of these two groups it is firstly necessary to ... those of Q. pyrenaica. The increase is greater in Q. robur, were in one of the treatments an increase of 40% was registered, against a maximum of 28% in Q....

Ngày tải lên: 08/08/2014, 00:22

... of chipping which influence the whole process. The paper deals with the process of wood chipping by achipper in order to deter- mine its energy consumption. The main purpose was the determination ... motor during caracole and by the rotor in consequence of the revolution decrease. e torque of the rotor consists of the disc torque, shaft torque and cardan shaft torque. e...

Ngày tải lên: 07/08/2014, 10:21

... avoiding planting on sites already invaded by competing species; (2) integrating autecological characteristics of competing species in forestry practices [9–11]; and (3) producing and planting large ... important to first include the nursery production of various stock sizes, instead of grading seedlings within a given population; and second, to evaluate competing vegetation eff...

Ngày tải lên: 08/08/2014, 01:21

... changes in gL. Sperry and Pockman (1993), by inducing embolism in branches, demonstrated the in Betula, stomata were capable of responding to variations in gL independently of ... daily variations were linear in our study, which proves that gL is independent of dF midday and ii) gL was also linearly related to inde- pendent measurements...

Ngày tải lên: 08/08/2014, 18:21

... Osmotic adjustment in Pinus pinaster cuttings in response to a soil drying cycle, Ann. For. Sci. 59 (2002) 795–799. [36] Niinemets Ü., Role of foliar nitrogen in light harvesting and shade- tolerance of four ... find any significant differences in the soluble sugar concentration. Light levels in the understory of mature cork oak stands in Spain, can vary from 12 to 70%...

Ngày tải lên: 08/08/2014, 00:22

... yet included in the model. The behaviour of the model is demonstrated in Figure 4 for trees with DBH ranging from 15 to 40 cm. Contrasting levels of the in uencing factors (Rdi, admixture of beech, ... [51] to take into account the repeated measurement structure of periods nested within a plot. Thus, in the end we decided not to include such a term in the model. The a...

Ngày tải lên: 07/08/2014, 16:20