Báo cáo lâm nghiệp: "How to identify larvae of the protected species: Dioszeghyana schmidtii (Diószeghy 1935), and survey its presence and abundance (Lepidoptera: Noctuidae; Hadeninae)" pot
Báo cáo lâm nghiệp: "How to identify larvae of the protected species: Dioszeghyana schmidtii (Diószeghy 1935), and survey its presence and abundance (Lepidoptera: Noctuidae; Hadeninae)" pot
... ad-vantages of such.MATERIAL AND METHODS To obtain D. schmidtii larvae it is recommended to simply beat the bottom branches of the food-plant up to 3 m above ground level. The larvae of this ... possibilities.(C) Degree of isolation of the population present on the site in relation to the natural range of the species.(D) Global assessment of the value of the site for conservation of the species ... order to collect larvae as an useful way to record and to survey D. schmidtii. Larvae of the species can be collected by beating branches of its host plants (Quercus and Acer species) in the...
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Báo cáo lâm nghiệp:" How to relate the standing tree shape to internal wood characteristics: Proposal of an experimental method applied to poplar trees" pptx
... less obvious level, the occurrence of reaction wood is linked to the history of tree growth, and inparticular to the evolution of its shape where the environmentalfactors and the competition for ... measurements such as the height, the local tree slope, the eccentricity of the tension wood area, or the eccentricity of the disc are discussed to illustrate the potential of the method.standing tree ... measurements and disc positioningAfter the external shape was measured, the location of each targetwas measured by controlling the motion of the robot and the rotation of the log to set the laser spot...
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Báo cáo lâm nghiệp: "How long can seeds of Norway spruce (Picea abies (L.) Karst.) be stored?" pps
... Duringstorage the containers should be tightly sealed and neveropened before the end of storage. Seed moisture content and temperature of storage should be the lower, the longer is the planned storage ... Because of the limitednumber of seeds, they were stored in one polyethylene bag. Whenthese seeds were used for testing their viability, the bag was openedin the cold-store and after pouring off the ... to gain information about the growth of seedlingsafter storage of seeds, the latter being a decisive criterion of the usefulness of any seed storage method.2. MATERIALS AND METHODS 2.1. Storage...
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Báo cáo lâm nghiệp: "Improving RBS estimates – effects of the auxiliary variable, stratification of the crown, and deletion of segments on the precision of estimate" pps
... paths of each tree (eq. [1]) and the true totals and variances of the target variables and the estimates of the totals, respectively.Choice of the auxiliary variable and variance of the estimateAs ... individual trees and defined the product of the squared diameter and the length of the branch beginning at the base of the segment, a proxy of the volume of that part of the branch, as the auxiliary ... variable, and selection with or without replacement. In the present study, the effects of the choice of the auxiliary variable, of the deletion of segments, and of the stratification of the tree...
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Báo cáo lâm nghiệp: "Growing stock-based assessment of the carbon stock in the Belgian forest biomass" ppsx
... Finally, the carbon content (CC) enabled the conversion from total dry mass to total carbon stock.As the aim of our study was to improve the methodology for the calculation of the total carbon stock ... for the most importanttree species in the Belgian forests, (ii) to calculate the total car-bon stock in the living biomass of the Belgian forests for the year 2000 and (iii) to identify the ... introduces the largestvariability in the calculation of the C-stocks in the Belgian for-est biomass was detected.According to our methodology, the total carbon stock in the living biomass of the...
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Báo cáo lâm nghiệp: " A flow cytometric evaluation of the nuclear DNA content and GC percent in genomes of European oak species" pptx
... microdensitometry tends to underevaluate the DNA content of nuclei. To evaluate this fluctuation, we tested fiveisolation buffers for cytometric assessment of Quercus spp and found ... identi-fied and paired on the basis of C-band pat-terns (Ohri and Ahuja, 1990). Theseauthors also assessed nuclear DNA con-tent by Feulgen microdensitometry, obtain-ing ... stand-ard deviations.Unfortunately, there are no availablemicrodensitometry or flow cytometry dataon the DNA content in other Fagaceae gen-era (Castanea, Fagus, Nothofagus,...
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Báo cáo lâm nghiệp: "How the absolute growth rate of poplar adapts to the light-NO -dosage 3 G.A. Pieter" pot
... correspondence be-tween the development of the vascularsystem of poplar, the growth of the organs and the development of absolute growthrate of the plant. Adaptation proceeds ... analyzed the develop-ment of the vascular system of poplar. The number and the length of the vascularbundles in the vascular cylinder increasein a systematic way; at the ... way similar to that of nitrate dosage. As the availability of (reduced) nitrate in the plant becomeslimiting, the expansion of the vascular sys-tem stops and the branch...
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Báo cáo lâm nghiệp: "Contribution to knowledge of Hylesinus fraxini (Panzer, 1779) (Coleoptera: Scolytidae) natural enemies from Northern Moravia (Czech Republic)" pdf
... influ-ence of insects’ predation and parasitoids on the total population of the bark beetle was calculated on base of the following mathematic relations.Presumptions of utilize mathematic relations ... rates of parasitoids and its relevance to biological control. L et al. 1994 studied the role of the para-sitism and intraspecific competition in the popula-tion dynamics of the bark ... taxonomic positions and associations with H. fraxini for all species. Percentage rates of total predation (together birds and insects), total parasitism and total mortality of bark beetles H....
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Báo cáo lâm nghiệp: "Contribution to the knowledge of Clethrionomys glareolus populations in forests of managed landscape in Southern Moravia (Czech Republic)" pot
... difficult factor to consider in relation to the mammalian population regulation without taking into account its interactions with the behaviour and abundance of the prey popu-lation. As the Cg ... M 1991).As to the dynamics of abundance during the 3 years of study the years 2002 and 2004 seem to be similar. As the harvest of seeds in forests varied in the partic-ular years, ... crops in the year 2001 and 2003 were medium sized. In the year 2001 there was a good harvest of hornbeam and lime seeds and this also positively influenced the abundance and litter size of Cg...
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Báo cáo lâm nghiệp: "Contribution to the knowledge of Apodemus sylvaticus populations in forests of the managed landscape of southern Moravia (Czech Republic)" potx
... forest complexes of southern Moravia depending on the biotope and food supply including the response of the population to the crop of acorns and small-seed trees.MATERIAL AND METHODSe material ... of 0.5 m2 and the average amount of mast was deter-mined. e plots were selected randomly in the oak stand and the number of acorns was determined on each of the plots. e acorns were then ... is the least suitable biotope for the species (Z 1976, 1991) due to the high proportion of oak in the stand and thus also the high abundance of larger and more aggres-sive A. flavicollis...
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