Báo cáo lâm nghiệp: "Direct effects of acidic wet deposition on photosynthesis and stomatal conductance of two Populus clones (P cv Beaupré and P cv Robusta" pot

... of upper and lower leaf sur- faces (Fig. 2). For both clones and treat- ments, gs sat shows its maximal value on fully expanded leaves. The optimal leaf ages were LPI ... 9 for cv. Beaupr6 and LPI 12 for cv. Robusta. On the whole, acid rain caused a decrease of stomatal conduc- tance; gs sat was reduced by 24.0% for cv. Beaupr6 an...

Ngày tải lên: 09/08/2014, 04:20

... flooding and non-flooding condition was Table 1. e effect of long-term flooding and Phytophthora alni infection on the development of black alder saplings Treatment per valid N Length of necrosis ... O.K. (1996): Phytophthora Diseases Worldwide. St. Paul, APS: 562. G J.N., L M.A., P  A.J. (1999): e impact of Phytophthora disease on riparian populations of...

Ngày tải lên: 07/08/2014, 10:21

... from the parent stand and of other woody plants in relation to seedlings older than one year. White numbers correspond to the (percent) proportions of beech seedlings in the group of parent ... sterile periods, in European beech stands are ex- aggerated. Every two or three years the production of beechnuts is sufficient for regeneration in conditions of suitably prepared soil...

Ngày tải lên: 07/08/2014, 10:22

... stress were conducted to test the influence that acorn size and soil preparation (only in field) exert on the survival and development of this species. The soil preparation consisted of preparing seed ... le poids du gland ont été les facteurs qui ont provoqué le développement plus important de cette espèce en p pinière. Néanmoins, en plein champ, dans des conditions de stress hydriq...

Ngày tải lên: 07/08/2014, 16:20

... fertiliser (P < 0.05) (Fig. 1). Addition of P fertiliser decreased concentrations of N (P = 0.0005), but increased concentrations of K (P = 0.02). Ratios of N :P were Figure 1. Relationships between ... concentrations of Rubisco, N, P or K. We conclude that fertiliser application two years previously has little effect on current A max and δ 13 C of P. p...

Ngày tải lên: 08/08/2014, 00:21

... limited and waterlogged conditions [9, 27]. Photosynthesis would also be inhibited due to the increased participation of competing pathways and consumption of electrons and reductant in non- photosynthetic ... integrating sphere, 0.5 is the proportion of photons partitioned to PSII and I o is the incident irradiance. The proportion of electrons that are dissipated through p...

Ngày tải lên: 08/08/2014, 00:22

... levels of light and phosphorus availability and whether some interactive responses to light and phosphorus limitation occur, particularly for phosphorus productivity (P P ) and radiation-use ... at LP and IP, and the slope of the linear relationship between plant P concentration and RGR, i.e., phosphorus productivity, was highest (Fig. 3). It levelled off at higher...

Ngày tải lên: 08/08/2014, 00:22

... Thinning effects on the structure of coppices 773 those expected under random distribution, so the spatial pattern is clus- ter. The transformation proposed by Besag in the discussion of Ripley paper ... implementation of direct and indirect production uses for these stands (silvo- pastoral uses, recreation, environmental preservation), there is an urgent need to study and manag...

Ngày tải lên: 08/08/2014, 01:22

... growth of new components, pointing to the absence (1) of consumption of C reserves for respiration and (2) of no important N release in the soil after lifting as pre- viously demonstrated on Quercus ... by horticultural practices can increase strongly risks of degradation of water potential and C and N acquisition on the site of installation, and compromise success-...

Ngày tải lên: 08/08/2014, 01:22

... (1992) Stomatal conductance, photosynthesis and respiration of temperate deciduous tree species grown outdoors at an elevated concentration of car- bon dioxide. Plant Cell Environ ... &pi; o and either transpiration index or &Psi; wp (fig 2). In roots, there was osmotic adjustment (&pi; o decrease of about 0.3 MPa) in response to d...

Ngày tải lên: 08/08/2014, 18:21