Báo cáo lâm nghiệp: "Serotinous cones of Cupressus sempervirens provide viable seeds in spite of high seed predation " ppsx

... s.e.) of seeds per tree for potential (= (no. of filled seeds + no. of damaged seeds) × germination rate × no. of serotinous cones) and realised seed crop (= no. of filled seeds × ger- mination ... 62–66. Seed predation in cypress serotinous cones 783 2.4. Assessing insect and fungi impact on seed yield and seed germination potential of serotinous cones Th...

Ngày tải lên: 08/08/2014, 01:21

... SCPs of pupae and overwintering 5th instar larvae, but mean SCPs significantly declined with the development of larval instars. Mortality of overwintering larvae increased as temperature declined ... S a ,LeK a * a State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, China b Department...

Ngày tải lên: 07/08/2014, 16:20

... comparisons of ponderosa pine trees growing in contrasting habitats (desert vs. mountain) did not evidence any difference in water storage between habitats [93]. In pine dominated forests, the strategy in ... pro- gressive loss of resilience, by depleting the ability of surviving plants to regenerate [88]. There is increasing evidence supporting the occurrence of hydraulic cons...

Ngày tải lên: 07/08/2014, 16:20

... levels, of increas- ing visible frost damage intensity, were observed from the base of the tree, using binoculars (Perl 8 × 56) if necessary. 84 F. Ningre, F. Colin Figure 2. Box-plots of annual ... the individual additional examination of a large num- ber of branches which would have considerably enlarged the survey. The risk of fork emergence of 71.7% obtained in plot P1, i...

Ngày tải lên: 07/08/2014, 16:20

... survival by reducing the risk of intracellu- lar freezing, owing to the lowering of the cytoplasm freezing point, and by maintaining cell turgor [11]. These strategies contribute to increasing the resistance ... Carbohydrates status as a measure of seedling qual- ity, in: Duryea M.L. (Ed.), Evaluating seedling quality: principles, procedures, and predictive abilities of major tests,...

Ngày tải lên: 07/08/2014, 16:21

... this point, a comment can be made concerning the denom- ination of red heartwood. In the case of a board with red heart, this higher level of redness in the heart, a tendency already observed in ... valuable in general. Moreover, industrial operations using heat treatment such as steaming or hot drying are known to change beech colour by inducing a more or less pronounced redden...

Ngày tải lên: 08/08/2014, 00:22

... sampling point, indicating that effects of fertilization on Ψ xylem were not dependent on initial root volume. Values of g s were higher for non-fertilized seedlings than fertilized seedlings ... until lifting in December 1999. Following lifting, seedlings were graded to operational specifications and placed in cold storage at 3 °C. Several days before outplanting, seedlings were w...

Ngày tải lên: 08/08/2014, 01:22

... took place during the growing sea- sons of the 3 consecutive years. Sap flow was continuously monitored by radial flow meters inserted in spring into the bole of the trees ... beginning of the drought, ie, when Ψ predawn and Ψ midday were still high. Whole tree apparent hydraulic conductance declined steeply at the beginning...

Ngày tải lên: 08/08/2014, 18:21

... plants growing in saturated soil is often ascribed to of seedlings established in hypoxic nutrient solution. Seedlings established in normoxic nutrient solution grew 131 % larger in ... nigra maintained the highest LWR under rhizosphere hypoxia. Stems of seedlings established in hypoxic nutrient solution were 20% smaller in mass than those of...

Ngày tải lên: 08/08/2014, 18:21

... levels of a-tocopherol. Materials and Methods In the various fumigation experiments, 3 mo old spruce seedlings were incubated in glass ves- sels with 100 pl of /3-pinene per ... the seedlings had been cultivated in groups of 50 on a 3:1 mixture of quartzsand and vermiculite irrigated with tap water. Cultivation took place in glass vessels...

Ngày tải lên: 09/08/2014, 04:20