Báo cáo lâm nghiệp: "Serotinous cones of Cupressus sempervirens provide viable seeds in spite of high seed predation " ppsx
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 7832.4. Assessing insect and fungi impact on seed yield and seed germination potential of serotinous cones The seeds of the first six analysed cones ... = (no. of filled seeds + no. of damaged seeds) × germination rate × no. of serotinous cones; 2. realised seed crop = no. of filled seeds × germination rate × no. of serotinous cones. 2.5. Statistical...
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Báo cáo lâm nghiệp: "old hardiness as a factor for assessing the potential distribution of the Japanese pine sawyer Monochamus alternatus (Coleoptera: Cerambycidae) in China" pdf
... SCPs of pupae and overwintering 5thinstar larvae, but mean SCPs significantly declined with the development of larval instars. Mortality of overwintering larvae increased as temperaturedeclined ... Sa,LeKa*aState Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences,Beijing 100080, ChinabDepartment of Entomology, Shanxi Agricultural ... absolute min-imum temperature in China, the –10◦C isotherm of January454 Ma et al.Figure 6. External and internal temperatures of tree boles recorded in Jingting Mountain, Anhui province from...
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Báo cáo lâm nghiệp: "Temperate forest trees and stands under severe drought: a review of ecophysiological responses, adaptation processes and long-term consequences" ppt
... comparisons of ponderosa pine trees growing in contrasting habitats (desert vs. mountain) did not evidenceany difference in water storage between habitats [93]. In pinedominated forests, the strategy in ... pro-gressive loss of resilience, by depleting the ability of survivingplants to regenerate [88].There is increasing evidence supporting the occurrence of hydraulic constraints within the soil-plant-atmosphere ... in somespecies like in Cupressus sempervirens [47]. The strategy of maintaining a large safety margin was reported in species ex-periencing periodically severe drought in their habitat like Ju-niperus...
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Báo cáo lâm nghiệp: "Frost damage on the terminal shoot as a risk factor of fork incidence on common beech (Fagus sylvatica L.)" docx
... levels, of increas-ing visible frost damage intensity, were observed from the base of thetree, using binoculars (Perl 8 × 56) if necessary.84 F. Ningre, F. ColinFigure 2. Box-plots of annual ... the individual additional examination of a large num-ber of branches which would have considerably enlarged thesurvey.The risk of fork emergence of 71.7% obtained in plot P1, in the case of ... Distribution of damage on the terminal shoot of the prin-cipal axis by height class in 1994, for each of the 2 plots (P1 andP2).3. RESULTS3.1. Intensity of frost damage depending on tree heightin...
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Báo cáo lâm nghiệp: "Nursery fertilisation affects the frost-tolerance and plant quality of Eucalyptus globulus Labill. cuttings" ppsx
... survival by reducing the risk of intracellu-lar freezing, owing to the lowering of the cytoplasm freezingpoint, and by maintaining cell turgor [11]. These strategiescontribute 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, Oregon StateUniversity, ... preserving the integrity of mem-branes. The lipid-protein ratio of cell membranes and the sol-uble protein concentration change during cold acclimation in a way that the threshold temperature of...
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Báo cáo lâm nghiệp: "Studies on European beech (Fagus sylvatica L.). Part 1: Variations of wood colour parameters" pptx
... 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 alreadyobserved in ... valuable in general. Moreover, industrial operationsusing heat treatment such as steaming or hot drying are knownto change beech colour by inducing a more or less pronouncedreddening and darkening. ... parameters are of the outmost importance in these phenomena, it should be inter-esting to know how beech wood colour is dependent on intraor inter trees, intra or between sites variations. In the presentpaper,...
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Báo cáo lâm nghiệp: "Fertilization at planting impairs root system development and drought avoidance of Douglas-fir (Pseudotsuga menziesii) seedlings" pot
... sampling point, indicating that effects of fertilization onΨxylem were not dependent on initial root volume. Values of gs were higher for non-fertilized seedlings thanfertilized seedlings ... untillifting in December 1999. Following lifting, seedlings were graded tooperational specifications and placed in cold storage at 3 °C. Severaldays before outplanting, seedlings were washed free of ... reduced growth and sur-vival of Douglas-fir [56] and Monterey pine (Pinus radiata D.Don) [38] seedlings. Survival and dry weight of container-grown Douglas-fir seedlings increased with greater N...
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Báo cáo lâm nghiệp: "Whole tree hydraulic conductance and water loss regulation in Quercus during drought: evidence for stomatal control of embolism?" doc
... took place during the growing sea-sons of the 3 consecutive years. Sap flow wascontinuously monitored by radial flow metersinserted in spring into the bole of the trees ... beginning of the drought, ie, whenΨpredawn and Ψmidday were still high. Wholetree apparent hydraulic conductancedeclined steeply at the beginning of ... (ABA) in the control of gs during drought. Roots in the dry zones of the soil are producing ABAthat provoke stomatal closure. An argument in favor of hormonal signals...
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Báo cáo lâm nghiệp: "Physiological, morphological and growth responses to rhizosphere hypoxia by seedlings of North American bottomland oaks" potx
... plantsgrowing in saturated soil is often ascribed to of seedlings established in hypoxic nutrientsolution. Seedlings established in normoxicnutrient solution grew 131 % larger in ... nigra maintained the highest LWR underrhizosphere hypoxia.Stems of seedlings established in hypoxicnutrient solution were 20% smaller in massthan those of seedlings established ... andspecies combination at 2 h intervals beginningat 0600 hours, and finishing at 2000 hours on 4days during the last week of the experiment. Oneach selected seedling, one...
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Báo cáo lâm nghiệp: "Light-quality and -quantity effects on monoterpene-mediated photo-bleaching of conifer needles" pot
... levels of a-tocopherol.Materials and Methods In the various fumigation experiments, 3 mo oldspruce seedlings were incubated in glass ves-sels with 100 pl of /3-pinene per ... theseedlings had been cultivated in groups of 50on a 3:1 mixture of quartzsand and vermiculiteirrigated with tap water. Cultivation took place in glass vessels in continuous ... The incubators were placed for 48 h in the various light environments in continuouslight or in 12:12 h cycles of light and dark at298°K. After fumigation, 5 seedlings...
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