Báo cáo lâm nghiệp: "Chemical composition of the periderm in relation to in situ water absorption rates of oak, beech and spruce fine roots" doc

... 763–772© INRA, EDP Sciences, 2004DOI: 10.1051/forest:2003071Original articleChemical composition of the periderm in relation to in situ water absorption rates of oak, beech and spruce fine rootsChristoph ... from the terminal root tip in all species. At 500 mmdistance from the tip, periderm thickness had increased to 50 µm in beech and spruce, and to 70 µm in oak. In beech and oak rootlets, the periderm ... needed to show whether oak, beech and spruce indeed differ with respect to drought sensitivity of fine rootgrowth and mortality. Finally, it is necessary to increase the spatial resolution of water...

Báo cáo lâm nghiệp: "Ecological conditions influencing the localization of egg-laying by females of the cockchafer (Melolontha hippocastani F.)" pps

... between the extent of the damage and the individual characteristics of the experimental plots. e relation between the extent of the damage and the method of estab-lishment of the stands and degree ... years in the period until the next swarming; basing on the correlation between the extent of the damage and the individual character-istics of the sample plots to deduce, which factors in uenced ... total number of the entire period of swarming; in this time interval intensive egg laying into the soil could be assumed.Basing on records of daily temperatures meas-ured using the automatic meteorological...

Báo cáo lâm nghiệp: "A pheasantry as the habitat of small terrestrial mammals (Rodentia, Insectivora) in southern Moravia (Czech Republic)" doc

... Ul-meto-Fraxinetum carpineum, Saliceto-Alnetum and Carpineto-Quercetum acerosum. As to the shrub and herb stratum, a great variety of species occurs there. In Ulmeto-Fraxinetum carpineum, ... out in 2002 to 2005. Small mammals were sampled using the standard method of line trapping by means of snap traps (P 1975) and combinations of snap and fall traps laid in the shape of ... interval of about two months, from the end of February to the beginning of November. One trap-ping operation took three nights.Caught small mammals were then identiﬁed in a laboratory to determine...

Báo cáo lâm nghiệp: "Species composition in low mountain beech (Fagus sylvatica L.) stands in the Bieszczady National Park under the global warming" doc

... evidence of the loss in the fir volume and the increase in beech volume was collected.– However, the increasing share of beech, accompa-nied by a decrease in the share of fir, is typical of the ... that the total rise in temperature in the immediate vicinity of the Carpathians and Tatras in the course of the current warming process is typical of Central Europe. Between 1881 and 1990 the ... share of 88.7% in the number of trees and 84.9% in the total stand volumes. Additional tree species include fir (5.7% in the tree count and 9.5% in stand volumes) and sycamore (3.8% and 3.5%...

Báo cáo lâm nghiệp: "Frost damage on the terminal shoot as a risk factor of fork incidence on common beech (Fagus sylvatica L.)" docx

... for the damage levels observed. To complete our under-standing of the effect of damage and consequently our under-standing of the effect of late frosts we need to carry out the same kind of “cohort ... decision to consider only the forks developed on the 1994 shoot of the main axis was in line with the aim of ourstudy which was to determine and quantify the most directeffects of the frost. However ... Distribution of forked and unforked trees in plots P1 and P2, individually (Tabs. Ia and Ib respectively) and then together (Tab. Ic),depending on frost damage intensity on the terminal shoot (Contingency...

Báo cáo lâm nghiệp: "Excess nitrogen affects the frost sensitivity of the inner bark of Norway spruce" pdf

... 1987, and arranged in arandomised block design with four replicates. There were 2347 trees·ha–1at the start of the experiment, and 25% of the standing biomass washarvested during the winter of ... according to Linder [25].2.5. Sugar and starch analysisTwo pieces of bark from each tree were freeze-dried and groundinto fine powder in a ballmill. The powder was put into percolators. The ... remained susceptible to invasion by pathogenic insects and fungi, further increasing the damage and even killing the tree in severe cases [37].High N deposition levels and acid rain can influence...

Báo cáo lâm nghiệp: "An approach for the analysis of vegetation spectra using non-linear mixed modeling of truncated power spectra" pdf

... thinning and fertilization, root pruning) and a controlreplicated three times in 15 m × 15 m plots. Age determination of treesgrowing in the same stand as the study trees indicated that the ... to contributesignificantly to the variance of a spectra. The choice of r–1 degrees of freedom in the numerator of the F-ratio test instead of 2 was adopted to keep the experiment-wide error rate ... spectra is needed. In addition to minimizing problems of data mining and colin-earity, the approach should also reduce the dimensions of the data with a minimum of information loss. It must accomplishthis...

Báo cáo lâm nghiệp: "phytotoxic solutions on the respiration of mycorrhizal and non-mycorrhizal spruce roots (Picea abies L. Karst.) Effect of" pot

... unit) to determine the part of the respiratory chainaffected by the phytotoxins present in these solutions. Working on isolated mito-chondria, like Moreland and Novitzky(1987), ... to follow the kinetics of oxygenconsumption by excised roots in a liquid The next stage in these studies is the investigation of the microcosm (cell unit) to determine ... on the young plants. This interactionwas demonstrated in the laboratory bymeasuring the respiration of excised spruce roots.Using oxygen consumption as an indi-cator of...

Báo cáo lâm nghiệp: "Chemical thinning in blue spruce (Picea pungens Engelm.) stands and its effects on cambioxylophagous fauna" docx

... Chemical thinning of blue spruce stands appears to be a viable technique of restoring these stands to their original tree species composition. However, care must be taken to avoid a signiﬁcant increase ... crown top part of the stem and the thick branches. e decreased quality of the phloem (high water content) is probably the reason behind the increased mortality of larvae and hindered insect ... chemical thinning consists in the fact that trees killed by chem-ical treatment and left in the stand to their natural Chemical thinning in blue spruce (Picea pungens Engelm.) stands and its...

Báo cáo lâm nghiệp: "Growth trends reveal the forest structure during Roman and Medieval times in Western Europe: a comparison between archaeological and actual oak ring series (Quercus robur and Quercus petraea)" pot

... number of tree rings, the average ring width and the average standard deviation of the tree-ring series. MS and AC(1): the means sensitivity and the average first-order autocorrelation of the tree-ring ... (BAI)instead of the ring width. The basal area is defined as the area of the cross-section of a tree stem near the base, generally measured at breastheight. The BAI is then defined as the increase ... timber. For oak, the density is mainly controlled by the cambial age and the ring width [33]. The amount of the denser latewood willincrease when the total ring width increases. According to recent...

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