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Báo cáo lâm nghiệp: "Seasonal changes of plant hydraulics, water relations and growth of Aesculus hippocastanum seedlings infested by the leafminer Cameraria ohridella" ppt

Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Seasonal changes of plant hydraulics, water relations and growth of Aesculus hippocastanum seedlings infested by the leafminer Cameraria ohridella" ppt

... 10.1051/forest:2005001Original articleSeasonal changes of plant hydraulics, water relations and growth of Aesculus hippocastanum seedlings infested by the leafminer Cameraria ohridellaFabio RAIMONDO, ... miner Cameraria ohridella causes premature defoliation in Aesculus hippocastanum. The impact of the parasite on seasonal changes of water relations, hydraulics and growth of three-year-old A. hippocastanum ... seedlings of A. hippocastanum can be hypothesized to be larger than that on adult individuals of the same species. To test this hypothesis, seasonal changes of plant hydraulics, water relations and growth...
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Báo cáo lâm nghiệp: " Fungi associated with Tomicus piniperda in Poland and assessment of their virulence using Scots pine seedlings" doc

... the trunk and transported to the Agriculture University of Cracow. The sections were cut from the trunk at a distance between2 and 8 m from the base of the trees. In the laboratory the bark wasseparated ... from the presentstudy are difficult to compare with these of Gibbs and Inman,they do not seem to support the results of Gibbs and Inman[6] because the samples were taken from older galleries of ... pine stands near Warsaw. The pathogenicity of blue-stain fungi has been studied by fungal inoculation of large trees (with low or high inocula-tion densities) and seedlings. The results of the...
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Báo cáo lâm nghiệp:" Ring shake in chestnut: Anatomical description, extent and frequency of failures" pdf

... this kind of fracture, which ismainly regulated by the relieving of growth stresses during the tree-felling. Therefore further studies on this topic, with the aim of reducing the risk of ring ... single ring shakewas then characterized by its position on the disc (distance from the pith, orientation and solar year of the annual ring affected by the split), length and type of wood failure (overlay, ... development of the other two fea-tures are rather unclear, even if all the authors dealing with thisspecie agree on the mechanical failure hypothesis. It is how-ever possible that the cracks and the...
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Báo cáo lâm nghiệp: "Seasonal fluctuation in germination of short and longterm stored Norway spruce" ppsx

... averages of GE and GC were expressed in absolute values (in %) and also by means of seasonal indexes (Š 1998), which standard-ise their course and eliminate the differences in the level of ... seed and stored seed are not unanimous. A group of authors (M et al. 1986) deduced a conclusion from their own works that in the assessment of the quality of fresh seed, the fact of the ... during the period of increased physi-ological activity of seeds, otherwise the results of the quality tests may be inconclusive. S (1930), on the contrary, states that the fresher is the...
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Báo cáo lâm nghiệp: "Seasonal and intraspecific variation of frost tolerance in leaves of three Canarian laurel forest tree species" doc

... for the restriction of productivity and survival of woody evergreen plants in Mediterranean-typeregions [35], we think that this could be one of the main causes of their confinement to the islands, ... in the Canary Islands in order to understand whether the effect of freezing temperatures in the past could be the cause of their present confinement. Chlorophyll fluorescence as anindicator of ... the initial symptoms of damage were a blushing of the main and sec-ondary veins and the damage was detected by chlorophyll fluo-rescence measurements only when the surface of the leaves wasaffected....
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Báo cáo lâm nghiệp: "Seasonal variations and acclimation potential of the thermostability of photochemistry in four Mediterranean conifers" doc

... afforestation of moun-tain areas in the southern Alps, Cedrus atlantica Manetti, ori-ginating from Northern African mountains and introduced to the southern Alps at the end of the XIXth century; ... courses of thermotolerance resultedin a large plasticity of Tc in the four species, with changes by as much as 4 °C despite a standardisation of the temperatures(at 20 °C) during 24 h before the ... although the ranking between C. atlantica and the other species was nevermodified. The time courses of Tc of the four species were paral-lel with that of mean temperatures (Fig. 3a) and a close...
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Báo cáo lâm nghiệp: "Seasonal development of female strobilus of stone pine (Pinus pinea L.)" ppsx

... next year of development, few changes in the ovuleoccur; the spongy tissue enlarges, the pollen tubes grow through the nucellus and the different layers of the integument,which ... enlarge and the cone closes.Near the end of April, a hyaline cellappears in the center of each ovule.Division of this cell initiates the spongytissue. During the whole ... the seed coat, begin todifferentiate.Not until February of the third year of development does the free-nuclear stage of the female gametophyte appear in the center of...
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Báo cáo lâm nghiệp: "Seasonal variations in photosynthetic activity of spruces as determined by chlorophyll fluorescence" ppsx

... the reoxidation capacity of the primary photosynthetic quencher OA,were higher for the normal green needles(Althof) than those of the Mauzenbergsite. The height of the ... time of the formation of the new year’s needles. The current yearneedles reach their maximum in May and June. The chlorophyll fluorescence signa-tures of the needles of ... of the photo-synthetic apparatus as seen from the lower Rfd-values.In contrast, the Rfd-values as a vitalityindex and as an index of the intactness of the photosynthetic...
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Báo cáo lâm nghiệp: "Preliminary study on phloemogenesis in Norway spruce: influence of age and selected environmental factors" ppsx

... formationSupported by the Ministry of Education, Youth and Sports of the Czech Republic, Project No. MSM 6215648902, and by the Ministry of the Environment of the Czech Republic, Project No. SP/2d1/93/07, and ... however, there were diff erences of weeks in the timing of the formation of the tissues. It means that the factor which describes the variability of phloem tissue growth when comparing young and ... is not the number of cells but the timing of their for-mation. When the results obtained in the old stand were compared with the results of other authors, it was found out again that the diff...
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Báo cáo lâm nghiệp: "Seasonal ionic exchange in two-layer canopies and total deposition in a subtropical evergreen mixed forest in central-south China" pps

... statistical analysis The fluxes of throughfall, sub-throughfall, and bulk precipitationwere calculated by multiplying the volume-weighted concentration by the amount of water and by making the necessary ... in the underestimation of the dry deposition and the overestima-tion of the canopy leaching of base cations using the canopybudget model compared with the actual fluxes. The seasonalsyntheses ... NH+4[44]. The mobility of NO−3via water solution in the soil facilitates its ab-sorption by plants. Nitrogen uptake rate is more a function of demand for N from the shoot rather than of the nutrient...
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