Báo cáo lâm nghiệp: "Eﬀects of soil mechanical treatments combined with bramble and bracken control on the restoration of degraded understory in an ancient beech forest" pptx

... dependent on the initial vegetation type and on soil seed bank composi-tion. We therefore encourage additional experiments in differ-ent stand and soil types in order to establish the generality of these ... on the considered soil parameters. Bothdisc and rotary ploughing induced an overall lowering of soil nutrient index and soil compaction, but different or mitigated in uences on soil moisture and ... implements in an ancient beech forest in central Belgium. The purpose of these investigationswas twofold: (1) to explore whether tillage has a long-lastingeffect on soil compaction and soil moisture,...

Báo cáo lâm nghiệp: "Eﬀects of the clear-cutting of a Douglas-ﬁr plantation (Pseudotsuga menziesii F.) on the chemical composition of soil solutions and on the leaching of DOC and ions in drainage waters" pps

... shortening of rotations and a mechani-sation of the thinning, harvesting and regeneration operationsresult in constraints to the physical, chemical and biologicalproperties of the soil [21]. On the ... on the in situ nitrogen mineralization and the nitrogen cycle in Forest clear-cutting and soil solutions 193 and (ii) the accuracy of the analysis, in which a deﬁcit of lessthan 5% of the ionic ... Cycling and budgets of acidity and nutrients in Norwayspruce stands in northeastern France and the Erzgebirge (CzechRepublic), ch. 3.3, in: Landmann G., Bonneau M. (Eds.), Forest de-cline and...

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

... variation of environment aff ects growth and adaptive traits in a provenance trial, and whether blocking can effi ciently handle this variation.MATERIALS AND METHODS e study is based on the analysis ... environmental diff erences among trials on pheno-typic variation rather than its decomposing into the eff ects of single environmental factors. In any case, the study demonstrates that the within-trial ... 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

... observations of the impacts of the 2003 drought and heatwave on the major European forest insect species and discussthese observations in the light of current knowledge and the- ories of interactions ... reports on the impacts of drought and high temperatures on forest insect populations in the context of this exceptional event. Observations of changes in population levels of the main European forest ... France (Fig. 4) began earlier in the season than usually. In France and Switzerland, I. typographus developed two gen-erations at low altitude and three generations in some stands in the plains...

Báo cáo lâm nghiệp: "Eﬀects of selective thinning on growth and development of beech (Fagus sylvatica L.) forest stands in south-eastern Slovenia" docx

... structure of the thinned (T1 and T2) and control (C1 and C2) stands in the years 1980 and 2001.Tab le IV . Comparison of mean annual basal area increment of trees in the thinned and control subplots.All ... trees in the thinned and the control standswere compared with t-tests. Additionally, we analysed ig of dominanttrees (100 largest trees per hectare) in the thinned and control stands on both ... Before the last thinning in 2001, the growing stock of the control stands C1 and C2 was 23% and 18% higher compared to the growing stock of the thinnedstands T1 and T2, respectively (Tab. III).The...

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

... dif-ferentiation balance hypothesis and concluded that plant re-sponses to nitrogen fertilization and shading were consistent with the predictions of both hypotheses in terms of pooledcarbon-based secondary ... 7% increase in soil N). The concentrations of soluble condensed tannins (CT) and nitrogen in the leaves were analyzed to test the phenotypic plasticity of these commonly related parameters in ... seedlings. For the two species, leaves of the fourseedlings harvested for each treatment and replication were pooled toobtain an amount suﬃcient for grinding and analyzing.Condensed tannins in...

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

... as the biotic response to alternating wet and dryseasons, the amount of soil water content available controlling the densities of woodland and grass [9]. In our study, soil water depletion was ... and stones includ-ing clasts of quartzite. These strata typically contain one or morered argic horizons with a silty to sandy texture in the surface hori-zon and a sandier layer below 1 m in ... rainfall and evapotranspiration rates higher than the amount of precipitation [22,32]. Change patterns in soil water content with depth and over time, and the corresponding dry and wetcycles, are...

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

... realised and within the time frame of the main incidence of the rust. Stem diameter and the main part of plant height were realized be-fore the onset of the pathogen incidence while the production ... tested set of clones during the trial. e intensity of infection during the growing sea-son in 2005 and 2007 was evaluated in the same way.  e ranking of clones according to rust inci-dence ... 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 a partial blurring of diﬀ...

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

... mixed-species stands of oak and beech. The aim of the study was to adapt one of the basic equations of the French growth simulator Fagacées for oak stands to mixedstands with oak and beech. The model ... changes in stand density, and thus beech trees with larger diameters gain more from changes in density than those with small diameters. Therefore, the large beech trees expand their dominance in ... parameterisedfor both pure beech and pure oak stands.For oak, Fagacées describes the stand basal area increment as afunction of dominant height, height increment of the dominant trees, and stand density....

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

... trends in the phenolog-ical structure of the stands, which changed with thinning and insectoutbreaks.We also inferred the morphological structure of the canopy fromLB1 and LB2 using another ... [26,31,32,35]. Increases and de-creases in gross growth were consistent with changes in leaf biomasscorresponding to thinning, insect herbivory, and stand recovery fol-lowing disturbance. The regression ... the elongation of long shoots [7, 22, 39]. Once the stand canopy hasclosed, however, horizontal elongation of long shoots becomes lessimportant, and the maintenance of foliage by short shoots becomesincreasingly...

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