Báo cáo lâm nghiệp: "Eﬀect of leaf biomass and phenological structure of the canopy on plot growth in a deciduous hardwood forest in northern Japan" pot

... eachcombination of plot and month. Annual leaf biomass was calculatedby summing monthly leaffall.To quantify the phenological pattern of leaffall and the corre-sponding phenological structure of the ... 2006)Abstract – We monitored leaf biomass, seasonal changes in leaffall, and plot growth for 11 years post-thinning in a secondary deciduous hardwood stand dominated by Betula maximowicziana Regel ... differences in leaf biomass between LT and UT. Excluding reductions in leaf biomass byinsect outbreaks, leaf biomass in UT was approximately 3 t ha−1. Leaf biomass in LT and HT increased over time and...

Báo cáo lâm nghiệp: "Eﬀect of Melampsora larici-populina on growth and biomass yield of eight clones of Populus nigra" ppsx

... the degree of infection within the particular clones of black pop-lar in the years of observation, the relationship be-tween the severity of clone infection by rust and the value of the growth ... pathogen. On later dates, toward the end of the growing season, there was an extreme increase in the inoculum amount in the environ-ment and a signiﬁ cant increase in infection pressure, which caused ... stability of the intensity of infection of black poplar clones by the rust (the rank of clones ac-cording to the intensity of infection) between the particular years was evaluated using Spearman’s...

Báo cáo lâm nghiệp: "Eﬀect of species composition, stand density and site index on the basal area increment of oak trees (Quercus sp.) in mixed stands with beech (Fagus sylvatica L.) in northern France" potx

... beech and pure oak stands.For oak, Fagacées describes the stand basal area increment as a function of dominant height, height increment of the dominant trees, and stand density. To allocate the ... selectionthinnings, but on stand-related thinning regimes. This partlyexplains the linear relation of ∆g and DBH per treatment. The DBH-range of the stands available has to be regarded as well. The ... the stand basal area increment to the individual tree basal area increment, Fagacées uses a nonlinear “seg-mented model”. In the segmented model, the evolution of basal areaincrement at 1.3...

Báo cáo lâm nghiệp: "Eﬀect of tree species substitution on organic matter biodegradability and mineral nutrient availability in a temperate topsoil" pptx

... variance. The F1axis was determined on one hand, by the nitrate and water-extractable Ca, Mg, and Mn contents, and on the other hand,by the water-extractable Fe and Al contents. This axis tendedto ... functions in various ways and at various rates, and particularly by the changes in carbon and nitrogen cycles. In forest soils, humiﬁcation and weather-ing processes depend on vegetation, parent ... trees, asalso shown in Figures 3 and 4.This indicates that the tree species are major parameters af-fecting the dynamics and activity of microbial communities and the dynamics and availability of...

Báo cáo lâm nghiệp: "Eﬀect of single Quercus ilex trees upon spatial and seasonal changes in soil water content in dehesas of central western Spain" potx

... leaf water potentials were compared each year by means of one way ANOVAs, with month as independent variable and waterpotential as dependent variable. The same analysis was applied permidday ... this variation, although small, can alsoexplain the favourable water status of the trees studied. For in- stance, integrating θ variation in BA site in the ﬁrst 3 m depth and at 13.3 m of distance ... as a conse-quence of a decrease water input, and an increase of wateroutput in the sub -canopy area. The evergreen Q. ilex presents a rainfall interception of about 30% [26] and absorbs waterfrom...

Báo cáo lâm nghiệp: "Eﬀect of an oil heat treatment on the leachability and biological resistance of boric acid impregnated wood" pps

... has an intermediatebehaviour regarding drying and consequently regarding boronleaching.Except a small increase of retention for wood treated with a 1.0% boric acid solution, boron concentration ... retention agent. The impact of these combinations isevaluated for boron retention and biological resistance to ter-mites and decay fungi.2. MATERIALS AND METHODS2.1. Wood material and chemicalsSapwood ... with about 60% of oleic acid and 15% of saturated fattyacids. Impact of these drying properties has been investigated regard-ing boron retention and biological resistance of wood to degradationorganisms.2.2....

Báo cáo lâm nghiệp: " Eﬀect of species and ecological conditions on ellagitannin content in oak wood from an even-aged and mixed stand of Quercus robur L. and Quercus petraea Liebl." docx

... castalin,roburin A and C on the one hand and the percentage of vescala-gin and vescalagin/castalagin ratio on the other hand. The signiﬁcance of these correlations is that the increase of the total ellagitannin ... vescalagin, castalagin,grandinin and roburin A- E content. The second axis explains16.1% of the total variation and is related to castalin, vescalin,percentage of vescalin, castalin, roburin A ... conditions on ten heartwood ellagitannins (vescalin, castalin, roburins A- E, grandinin, vescalagin and casta-lagin) and ellagic acid were investigated in a 100 years old stand of 5 ha located in...

Báo cáo lâm nghiệp: "Eﬀects of resource availability on condensed tannins and nitrogen in two Quercus species diﬀering in leaf life span" doc

... Recerca Ecològica i Aplicacions Forestals), Universitat Autònoma de Barcelona,08193 Bellaterra, Catalonia, SpainbCentre de Recerca Ecològica i Aplicacions Forestals (CREAF), Universitat Autònoma ... point of view, the Carbon Nutrient Balance [7] hypothesis relates carbon-basedsecondary compounds concentration to the balance betweencarbon and nitrogen in the plant and predicts that plants ... sulfate in 2 N HCl) and maintained in a boiling bath for 60 min. The absorbancewas read at 550 nm after cooling the tube. Non-heated replicatetubes for each extract were used as anthocyanin blank...

Báo cáo lâm nghiệp: "Eﬀects of microsite variation on growth and adaptive traits in a beech provenance trial." pps

... environmental indicators.  e aim of this study was to clarify to what extent the spatial variation of environment a ects growth and adaptive traits in a provenance trial, and whether blocking can ... subdivi-sion is achieving homogeneous environmental conditions within blocks so that blocking can re-move the within-trial environmental variation by using blocks as a source of variation in an analysis ... grid and their values for the positions of individual trees were estimated by ordinary point kriging. The evaluation of phenotypic variation (height, diameter, Julian days of spring flushing and...

Báo cáo lâm nghiệp: "Eﬀects of drought and heat on forest insect populations in relation to the 2003 drought in Western Europe" ppt

... broadleaf treessuch as O. brumata, larvae feeding on ageing foliage show de-clining growth rates and increasing dispersal with a dramaticincrease in mortality since this dispersal is passive ... winter of 2002–2003. In additionto this large-scale survey, an intensive study was conducted in southeastern France by a team of the Institut National dela Recherche Agronomique (INRA) in Avignon. ... greatly vary, espe-cially according to the general condition of the forest and itsmanagement regime. Consequently, understanding the interac-tions between drought, heat, and natural disturbances...

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