Báo cáo lâm nghiệp:" The key-role of topsoil moisture on CO2 efflux from a Mediterranean Quercus ilex forest" docx

... tostudy the temporal changes in CO2 efflux in response to soilwater availability and temperature. Several data are available on the respiration of Mediterra-nean ecosystems. Most of them were ... respiration of 5.7% and an increase of ecosystem respiration of 8.6%. For nonlimiting soil water conditions, at RWC = 1, the increases of respiration caused by a 1 °C temperature increase are of ... INTRODUCTION The efflux of CO2 from the soil, also referred to as soil res-piration, is a major component of the global carbon balance[33, 44]. Its importance is equal or greater than the estimatedterrestrial...

Báo cáo lâm nghiệp: "The influence of selected factors on energy requirements for plain milling of beech wood" ppsx

... geometry and mainly the beech species with and without false heart on cutting input.MATERIAL AND METHODS The main aim of the verification experimental investigation was to study, on the basis of ... technological parameters vc and vf, and on the tool angular geometry of a milling machine in the process of plain milling. Another goal of the experiment was the determi-nation of bulk ... of individual beech assort-ments and the comparison of results with available information on the given problems.Energy requirements were assessed on the basis of measurement and evaluation...

Báo cáo lâm nghiệp: " The influence of Picea abies on herb vegetation in forest plant communities of the Veporské vrchy Mts" ppt

... proportion of Picea abies (CCA score on the horizontal axis equal to the only one environmental variable – proportion of Picea abies; covariables – altitude, slope; logarithmic data transformation)Relevé ... Relation between the proportion of Picea abies and other variables including EIV (CCA with the proportion of Picea abies as the only environmental variable and altitude and slope as covariables); ... pseudoplatanus, Ulmus glabra, Acer platanoides, Tilia sp., though the oak dominated and scree and ravine forests are excluded from analysis. All considered stands are classiﬁable as syntaxa of...

Báo cáo lâm nghiệp: " The effects of cutting regimes on natural regeneration in submountain beech forests: species diversity and abundance" pdf

... CCFagus a cAbiesbTilia Quercus CarpinusAcer a a a a a a a a a a a a a a a a a a a abbbbbbbTreatmentFagus Abies Tilia Quercus Carpinus AcerCount (individuals/m2)J. FOR. SCI., 54, 2008 ... values of determination coeﬃcient (r2) represent the contribution to the total variance (the measure in what a change in one variable causes a change in the other). As for the other examined ... re-generation older than one year and their variability. Six woody plants occurring on all research plots were evaluated. In the case of beech we can see a gradual increase up to the peak reached...

Báo cáo lâm nghiệp: "The effects of transplanting stress on photosynthesis, stomatal conductance and leaf water potential in Cedrus atlantica Manetti seedlings: role of root regeneration" pdf

... seedlings, a markedand parallel decline in both C02 assimila-tion and stomatal conductance occurred from day 0 to day 9 after transplanting(Fig. 1a and b); afterwards the ... A t-for the transplanted plants was accompa-nied by an almost constant ci (Fig. 2), thusindicating that, despite the parallel evolu-tion of A and gs, the changes in Aweremainly ... Aweremainly due to an alteration of mesophyllphotosynthetic capacity. The effects of transplanting stress on photosynthesis,stomatal conductance and leaf water potentialin...

Báo cáo lâm nghiệp: "The effect of nitrogen content on the of Scots pine needles and shoots photosynthesis" doc

... ateach irradiance level. A non-rectangular hyper-variation in photosynthetic capacity, whe-reas coefficients of determination >90%are typical for broadleaved trees. The ... of measurement. The air temperature was 20°C, external C02concentration was 340 ppm and vapor pressuredeficit 5-10 mbar in the chamber. The horizon-tal photon irradiance ... a diffuse radiation field.Within-shoot shading was quantified interms of the mean silhouette area to totalneedle area ratio of a shoot, which deter-mines the relative...

Báo cáo lâm nghiệp: "The results of manipulated experiments with inoculation of Ips typographus (L., 1758) to spruce trees under various levels" potx

... tested on motion and than released to rearing cages. ey mated and established new generation. e breeding was con-ducted in natural temperature and light conditions to have adults at the end of ... former management practices rather than by natu-ral factors (E 1986). As a result of social and economy development, there appeared vast re-gions of non-native monocultures, suﬀering from ... refrigerator into wet envi-ronment and later transported to lab. After several days, the number of individuals was enough high to establish artiﬁcial rearing.Laboratory rearing of I. typographus....

Báo cáo lâm nghiệp: "The influence of irradiation on the behaviour and reproduction success of eight toothed bark beetle Ips typographus (Coleoptera: Scolytidae)" doc

... release to the start of prepara-tion of entry holes was almost the same for both irradiated and non-irradiated males. In spite of the fact, that the irradiated males walked a sig-niﬁcantly longer ... irradiated males reached a lower reproductive rate than the control males.n ȱ=ȱ5 a a a a a a a a a a a a a a a 0246810121416Galleries Matingȱchambersȱ GalleriesȱwithmotherȱtunnelGalleriesȱwithlarvaeȱtunnelMotherȱtunnelsperȱgalleryAbundanceȱperȱlogControl15Gy30GyFig. ... Separation was based on the great density of bristles on the pronota in females and/or bigger frontal projection typical for males. Separation of sexes of living, hand-held beetles was done...

Báo cáo lâm nghiệp: "The use of silica sand in micropropagation of woods" pot

... Rhododendrons etc. (K, K 1999).Paradoxically, in agar media it grows best if there is manifest attenuation and acidiﬁcation as a result of hydrolysis of the agar. Overall, the degree of hydroly-sis ... hydroly-sis of agar and the characteristics of the media after sterilization in an autoclave cannot be anticipated. Microbiologists state directly that agar media with the pH of 4.5 needed ... can conclude from these facts that all material useful to micropropagation should be con-sidered as a sole mother clone.Comparing cultures in sand and in agar A medium of ½ RM-1964 with a...

Báo cáo lâm nghiệp: "The effect of point application of fertilizers on the soil environment of spread line windrows in the Krušné hory Mts" docx

... (P et al. 2004).It is to suppose that the aerial application of surface liming may be one of the causes of imbalances in the availability of the studied bases. It mainly a ected natural processes ... avail-able potassium and mobile aluminium. e relation-ship of Al to univalent base cations is antagonistic. e risk of a negative eﬀect of Al becomes higher at a decrease in the content of humus ... correlation with calcium (Fig. 4; Tables 5–7) demonstrates that it comes from the aerial application of surface liming. C-substances participate in Mg2+ content rather in a negative bond that...

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