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Báo cáo lâm nghiệp: "The effect of excess nitrogen and of insect defoliation on the frost hardiness of bark tissue of adult oaks" pot

Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Moisture effect on carbon and nitrogen mineralization in topsoil of Changbai Mountain, Northeast China" pptx

... moisture-elevation interaction on C0 and C0k indicated that the environmental effect on C0 and C0k was complex and deserves further study in the future.Soil N mineralizationMost of the previous ... incubation experiment, this paper investigated the relationship between soil moisture and mineralization of C and N in soils with different vegetation types on the northern slope of the Natural ... Reserve Zone of Changbai Mountain. The elevation influence on soil C and N mineralization was also discussed. The results indicated that for the given vegetation type of Changbai Mountain the C and...
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Báo cáo lâm nghiệp: "A change in structural diversity and regeneration processes of the spruce virgin forest in Nefcerka NNR (TANAP) in relation to altitude" docx

... Evaluation of the average value of this indicator confirmed that the greatest diameter differentiation can be found in the spruce forest in the growth stage, which is understandable. On the other hand, ... distribution of the trees in the virgin forest, no tendency of their clustering in connection with altitude was found in the zones below 1,460 m. e influence of altitude was confirmed in the zone ... stages of the virgin forest with the increasing altitude. is is caused by worse ecologi-cal conditions and lower fructification of the trees. Evaluation of the seedbed revealed that 46.2% of the...
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Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp:"Net effect of competing vegetation on selected environmental conditions and performance of four spruce seedling stock sizes after eight years in Québec (Canada)" ppsx

... competi-tion-crop relationships. The different soil temperature profiles during the establish-ment phase of non-crop vegetation on the two sites illustrates the different competition dynamics. The ... of release treatments. The objectives of this study were first, to quantify the net effect of non-cropvegetation on soil temperature and light attenuation during the first five growing seasons. ... advantage of favourable light and soiltemperature conditions and contribute to delay potential nega-tive effects of competition on spruce growth. The need for research studies aimed at evaluating the...
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Báo cáo lâm nghiệp: "Human land-use, forest dynamics and tree growth at the treeline in the Western Italian Alps" ppt

... stringent regulations on the separation of grazing of domestic ungulates and forest land in the second half of the 20th century saw a general decrease in grazing and the application of a close-to-nature ... 3).Since the decade of the 1960s there has been a new reduction of grazing intensity and in most of the trees established in the first decades of the 20th century the apex exceeded the brows-ing ... im-portant to remember that the second half of the nineteenthcentury saw the end of the unfavorable climatic conditions of the Little Ice Age [22]. Other plausible causes of the growthrate increase...
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Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Which factors explain lepidopteran larvae variance in seasonal guilds on some oaks" pptx

... by the poor quality of leaves and the increasing accumulation of tannin as reported by F (1970) and also F et al. (2004). Because of a lack of information about the quality of food ... the year of study along A1 and host specificity along A2 were important in the summer feeder guild; and adaptation to lower quality of food along A1 and host specificity along A2 for the autumn ... meth-ods, hypotheses, and future directions. Annual Review of Ecology and Systematics, 27: 55–81.M R.J., L J.T., P A. (2002): Effect of plant architecture on colonization and damage...
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Báo cáo lâm nghiệp: "Genetic parameters for lignin, extractives and decay in Eucalyptus globulus" pdf

... Thissuggested that the small sample size and the use of only the outer part of the core reduced the power of the current study and therefore significance would generally be underestimated.All of the trees ... min-imising the costs or environmental impacts of the process.Kraft pulping generally involves the removal of most of the extractives, approximately 80% of the lignin and approxi-mately 50% of the ... pulp yield and cellulose content) and their corre-lated effects on the physical wood traits and growth in E. glob-ulus.Correlations amongst the chemical wood traits were of- ten strong and as expected...
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Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Variability in Populus leaf anatomy and morphology in relation to canopy position, biomass production, and varietal taxon" docx

... characteristics and productivity, on one hand, and taxon, on the other hand. The genus Populus is a member of the Salicaceae fam-ily and is subdivided into six taxonomically distinct sec-tions [18,21]. There ... result of the combined effects of irradiance and leaf aging, leaves at the base of the stems being the oldest ones and age decreasingfrom the bottom to the top of the stem. The variations in ... the thickness of the abaxial epidermis (EbT). The leaves of the genotypes of the Tacamahaca (T, T×B) and Tacamahaca× Aigeiros (T×D) sections were thicker than the leaves of the genotypes of the...
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Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Plasticity in growth, biomass allocation and root morphology in beech seedlings as induced by irradiance and herbaceous competition" pptx

... bio-mass allocation to the stem, constant allocation to the foliage and lower allocation to the fine roots in comparison to high- orfull-light [29, 49] conditions. As a consequence, the shoot-to-root ... herbaceouscommunities and multiple interactions with the overstoryinstead of simulated shade). The aim of this study was to test the following hypotheses: (i) beech reacts strongly to compe-tition from the over- ... development, and to gatherinformation on the optimal growth conditions for this specieswithin the study area.2. MATERIALS AND METHODS2.1. Study sites and experimental design The study area was the...
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Báo cáo lâm nghiệp: " Natural hybridization between cultivated poplars and their wild relatives: evidence and consequences for native poplar populations" pdf

... canadensis hybrids and in the absence of conspecificmales. This is the only study reporting on introgression in the offspring of black poplar and the results are in contrast withother studies, were ... and the detection of regions in the genome that are less prone to introgression wouldallow a better understanding of introgression and subsequentconsequences for the native poplar populations ... [58]. The arrange-ment of genes and their action will have a major impact on the genomic pattern and rates of introgression [58]. If hybrid pop-ulations act as evolutionary filters, there are...
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Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Chromosomal differentiation between Pinus heldreichii and Pinus nigra" pptx

... after DNA denaturation/renaturation and revealed important differencesin number and position of bands between the two species. Number of secondary constrictions (SCs), of NORs and of nucleoli also ... pairs 5 and 12.DAPI banding displayed the highest number of signals (58) inkaryotype of P. nigra. The number and position of mentionedspecific bands are presented on ideograms (Figs. 2A and 2B). ... intercalar bands on short arm (pairs 2, 7, and 8), chromosome pairs with centromeric and intercalar bands on long arm (pairs 5, 9 and 12) and chromosome pairs with cen-tromeric band and intercalar bands...
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