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. Both disc and rotary ploughing induced an overall lowering of soil nutrient index and soil compaction, but diffe...

Ngày tải lên: 07/08/2014, 16:20

... shortening of rotations and a mechani- sation of the thinning, harvesting and regeneration operations result in constraints to the physical, chemical and biological properties 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 an...

Ngày tải lên: 07/08/2014, 16:20

... 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 stud...

Ngày tải lên: 07/08/2014, 10:21

... observations of the impacts of the 2003 drought and heat wave on the major European forest insect species and discuss these 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...

Ngày tải lên: 07/08/2014, 16:20

... 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 stands were compared with t-tests. Additionally, we analysed i g of dominant trees (100 largest trees per...

Ngày tải lên: 07/08/2014, 16:20

... 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 pooled carbon-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...

Ngày tải lên: 07/08/2014, 16:21

... as the biotic response to alternating wet and dry seasons, 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 more red argic horizons with a silty to sandy texture in the surface hori- zon and...

Ngày tải lên: 07/08/2014, 16:21

... 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 ra...

Ngày tải lên: 07/08/2014, 10:21

... 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 mixed stands 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...

Ngày tải lên: 07/08/2014, 16:20

... trends in the phenolog- ical structure of the stands, which changed with thinning and insect outbreaks. We also inferred the morphological structure of the canopy from LB1 and LB2 using another ... [26,31,32,35]. Increases and de- creases in gross growth were consistent with changes in leaf biomass corresponding to thinning, insect herbivory, and stand recovery f...

Ngày tải lên: 07/08/2014, 16:20