Báo cáo lâm nghiệp: "In situ measurement of leaf water use efficiency of lilac (Syringa vulgaris): comparison with crop plants" docx

... these values of gc, water is wasted.Materials and Methods Lilac, potato and maize were grown in the fieldat Grignon, 40 km west of Paris.Measurements were made with a Parkinson leaf ... themaximum of demand function crosses theC; regulation line. We can observe that, ifWUE of maize is higher than the WUE of lilac or potato, the junction occurs withinthe ... Fig. 2. Note that the lilac datashow a low scatter. For potato, the highscatter could indicate water stress; but thisis not apparent from leaf water potentialdata (Bethenod...

Báo cáo lâm nghiệp: "Inﬂuence of tree species on gross and net N transformations in forest soils" ppsx

... 0.01) 21 3.9 0.41Samples of 120 g of soils from each stand were spread as a thin homo-geneous layer of about 2 mm on plastic trays [20]. Soils were sprayed with 10 mL of either a 0.005 M15NH4NO3or ... mineralization in the soil of the old coppice was related to low gross rate of mineralization rather than to the concurrent eﬀect of microbial immobilisation of mineral N; (2) the absence of nitrate in the ... reasons, we used small additions of moder-ately labelled nitrogen to study gross mineralization and ni-triﬁcation rates. This did not allow measurement of gross im-mobilisation of 15N in organic...

Báo cáo lâm nghiệp: "Inﬂuence of the fertilisation method in controlled ectomycorrhizal inoculation of two Mediterranean pines" ppt

... http://dx.doi.org/10.1051/forest:2007035Controlled mycorrhization of pine seedlings 581Table III. Eﬀect of the inoculation with diﬀerent ectomycorrhizal fungi and of the fertilisation method on growth of containerised Pinus pineaseedlings. ... species [9].Vegetative inoculum of P. tinctorius was poorly eﬀective,producing low number of mycorrhizal seedlings of both pines.Percentage of ECM varied with the fertilisation method forP. ... evaluated the use of two fertilisation methods (solublefertiliser and slow-release fertiliser) for producing mycorrhizalseedlings of both Mediterranean pines. The dosage of nutri-ents applied with...

Báo cáo lâm nghiệp:"Poplar plywood resistance to wood decay agents: efficacy of some protective treatments in the light of the standard ENV 12038" ppt

... impregnated with 160 g m–2 of phenolic resin and partly coat-ing the panel with a layer of adhesive mixture (the same type as thatused for bonding the single layers, but with the addition of ferrousoxides ... for a total of 6 different combina-tions, as given below:All the panels were glued with the same adhesive mixture made up of 100 parts of MUF resin, 8 parts of coconut flour, 2 parts of wheatflour ... results in shorter times and be more in line with the realsituations of the use of panels in outdoor conditions. Withinthe current evolution of the European standardization frame-work, a new approach...

Báo cáo lâm nghiệp: "In vitro clonal propagation of Acacia mangium Willd. and its evaluation of genetic stability through RAPD marker" ppsx

... DNA (RAPD).multiplication de légumineuses ligneuses / micropropagation / marqueurs RAPD1. INTRODUCTIONMicropropagation of tree species offers a rapid means of producing clonal planting stock ... indicates the size of the marker. Lanes 1–19 showRAPD products from micropropagated plants. Table I. Bud sprout responses of nodal explants of Acacia mangium on MS medium supplemented with different ... Acacia mangium 383Figure 1. Micropropagation of Acacia mangium. (a) Development of bud sprout from nodal explants (arrow) of Acacia mangium on MSmedium supplemented with 1.0 mg/L BAP, 1.0 mg/L...

Báo cáo lâm nghiệp: "Growth and yield model for uneven-aged mixtures of Pinus sylvestris L. and Pinus nigra Arn. in Catalonia, north-east Spain" pptx

... are very important. The system of models shows someweaknesses with very large trees (over 50 cm of dbh), becausethe data included very few large trees. The growth of verylarge trees may be overpredicted ... value of the coeffi-cients of determination, 0.18 for P. sylvestris and 0.21 forP. nigra, when the species dummies are used in the plot factormodels. The low R2 of this study agrees with ... avoiding the use of site index and stand age.More accurate description of site fertility was obtained whenspecies dummies were used, although it should be remem-bered that the presence of species...

Báo cáo lâm nghiệp: "Whole tree hydraulic conductance and water loss regulation in Quercus during drought: evidence for stomatal control of embolism?" doc

... the leaf xylem of the droughttrees in the absence of regulation. We canthus predict that because of these tensionsand because of runaway embolism, thedegree of embolism ... (dF) /leaf water potential (Ψ leaf ) relationships. gL was clearly reduced with the development of thedrought. The decrease of gL with Ψpredawn was of an ... aresplit into two compartments with different water regimes). In both situations, althoughthe leaf water status is unchanged, thehydraulic functioning of the tree is largelymodified...

Báo cáo lâm nghiệp: "Ecological light measurement in forests using the light degradation effect in hydrogenated amorphous silicon(a-Si:H)" pot

... quick exchan-ging of samples so that even large numbers of samples can be measured within a reasonablyshort period of time.Upon completion of both measurements theradiation ... assessment of the abovemethod for ecological light measurements ispossible owing to the very few measure-ments, the lack of comparison with measu-rement data of identical ... the spec-tral efficiency of photosynthesis. Above allthe short-wave break-off edge of sensorreaction at about 400 nm has to be achie-ved by means of filters. The...

Báo cáo lâm nghiệp: "in dormancy breaking of tree seeds" pptx

... dormancy breaking of tree seedsZ. SzczotkaU. LewandowskaInstitute of Dendrology, Polish Academy of Sciences, Kornik, PolandIntroductionWork connected with the role of poly-amines ... break-ing of dormancy, and their possible inter-action with changes in the activity of otherfundamental metabolic indicators; 2) re-cognition of the influence of polyamineson ... of dormancybreaking of Acer platanoides and Fraxi-nus excelsior seeds (in the initial stage)has proceeded in two directions: 1)studies of changes in the content of endogenous...

Báo cáo lâm nghiệp: "In vitro propagation of Prosopis P. cineraria and P. juliflora) species" potx

... nodes/shoot) with 3 mg/I K, 23 mg/l NAA but 1 mg/I BA,3 mg/I IBA gave reduced leaf abscission.Rooting of P. cineraria was obtained only with combinations of K and IBA ... I. High levels of BA induced shootproliferation of P. chilensis with 15 mg/lBA, 5 mg/l NAA giving the highest mean of 4.3 shoots/node. Similar levels of Kwere much ... were transferred to compost in agreenhouse with 100% survival after 3months.Discussion and ConclusionThe relative ease of micropropagation inthis study was P. chilensis...

Xem thêm