Báo cáo lâm nghiệp: "Predicting the vertical location of branches along Atlas cedar stem (Cedrus atlantica Manetti) in relation to annual shoot length" pdf

Báo cáo lâm nghiệp: "On the occurrence of web-spinning sawflies of the genus Cephalcia (Hymenoptera, Pamphiliidae) in the Czech Republic" potx

... 57–62Because of the lack of a recent survey of Cephal-cia species in the Czech Republic, the goals of this study were (i) to monitor web-spinning sawﬂies liv-ing on spruce in mountainous regions ... species occurrence. Canonical axes explain 65.8% of variability J. FOR. SCI., 53, 2007 (Special Issue): 57–62 59Table 1. Survey of studied web-spinning sawﬂies of the genus Cephalcia in the Czech ... periods of the Cephalcia species ﬂight activities (cf. M- 1988). e ﬂight activity started in the stud-ied localities at the end of May or at the beginning of June depending on the actual...

Báo cáo lâm nghiệp: "About the benefits of poststratification in forest inventories" potx

... (1 n/N) ì 2/n, independently of the original dis-tribution of the variable of interest. Here, although the estimate of the true mean is unbiased and the variance of the mean decreases ... samples of size 100, 32 of size 110, and 4 of size 121. In sampling a nonrectangular area, variability of the sample size will further be increased depend-ing on the irregularity of the particular ... 139JOURNAL OF FOREST SCIENCE, 53, 2007 (4): 139–148 Poststratification is well known as a means of increasing the precision of estimates in unstratiﬁed sampling by incorporating additional information...

Báo cáo lâm nghiệp: "Improving RBS estimates – effects of the auxiliary variable, stratification of the crown, and deletion of segments on the precision of estimate" pps

... variables, the stratiﬁcation of the crown and the deletion of segments. In the present study, the eﬀects of the choice of the auxiliary variable and of the created crown structure (segments and nodes, ... dele-tion of the stem segments. After this closer look at the old pine, the eﬀect of stratiﬁcation and deletion of the stem segments on the precision of estimates is to be studied for all trees of ... e analysis of the eﬀects of the crown structure concentrates on the stratiﬁcation of the crown and on the deletion of greater segments (e.g. the stem) by using the classical RBS. Statistical...

Báo cáo lâm nghiệp: "Assessing the short rotation woody biomass production on marginal post-mining areas" doc

... Supported by the Federal Ministry of Food, Agriculture and Consumer Protection and by the Vattenfall Europe Min-ing AG.Assessing the short rotation woody biomass production on marginal post-mining ... supported by the fact that the hedgerows result in higher crop yields compared with conventional agriculture. Regardless of the economic assessment of the production of short rotation biomass the ... recul-tivation crop in this region. Therefore, it can be concluded that for an improvement of soil fertility woody biomass production is more beneficial than the conventional agricultural recultivation...

Báo cáo lâm nghiệp: "reproductive and morphometric characteristics of wild boar (Sus scrofa) in the Czech republic" pot

... (without the ending and often extended hairs), metatarsal length (LTp) from the calcaneal joint to the tip of the hoof, ear length (LA) from the root of the ear to the tip, and height at the withers ... as the distance from the tip of the fore leg to the highest point at the withers. Weight was deter-mined according to circumstances: (i) the whole undressed individual, (ii) the weight of ... a dressed in- dividual including head and legs, or (iii) the weight of a dressed individual without head and legs. Age was determined in all animals. In indi-viduals up to the age of 2 years,...

Báo cáo lâm nghiệp: "Predicting the vertical location of branches along Atlas cedar stem (Cedrus atlantica Manetti) in relation to annual shoot length" pdf

... angle.between the height of insert point of the highest branch and the height of insert point of the branch of interest). In every annual shoot of the stem, the branches were ordered from the top to the ... Branch location on Atlas cedar tree stem 717 the growth rate of the parent shoot. In particular, the great ex-tent of the neoformed zone 3 in the annual shoots of the main stem expresses the adaptive ... hr is the calculated height of insert point of the branch to the pith, hm is the measured height of insert point of the branch to the trunk, ri+1is the radius of the stem measured below the branch...

Báo cáo lâm nghiệp: "Predicting the environmental thresholds for cambial and secondary vascular tissue development in stems of hybrid aspen" pptx

... 14-04-1999. The vertical and horizontal lines in the graph represent the threshold values for the accumulation of the indicated secondary vascular cell types. For periclinal divisions in the cambium, and ... estimated in the two direc-tions. In the first case, fusiform cells were counted along the radial files in the xylem portion of the cambium (i.e., to the inside of the cambial initials). In the second ... s.e.) of environmental variables involved in the production of the various cell types in the secondary vascular system of hybrid aspen stems. α is the elemental rate of cell number increase in relation...

Báo cáo lâm nghiệp: "Modelling the demographic sustainability of pure beech plenter forests in Eastern Germany" pot

... view of practitioners in the beech plenter forest in Thuringia [9, 12–15]. They all considered a standing volume of about 250 m3/ha to be the upper limit to maintain the plenter system in these ... muchhigher in beech forests than in conifer-dominated ones. It alsoexplains why there has been little or no success in the past whenapplying the principles of the plenter system to broad-leaved forests ... estimation is the most sensitive point in the equilibrium model. According to the rule of sustainability, the sum of removal must correspond to the whole increment (in terms of basal area increment...

Báo cáo lâm nghiệp: "Predicting the potential distribution of Sirex noctilio (Hymenoptera: Siricidae), a significant exotic pest of Pinus plantations" pot

... susceptiblehosts are located within the shaded area(Jianghua Sun, 2004, unpublished data). 126 A. J. Carnegie et al.There are large areas of forests of P. massoniana in the south-east of China and of Larix ... 10.1051/forest:2005104Original articlePredicting the potential distribution of Sirex noctilio (Hymenoptera: Siricidae), a significant exotic pest of Pinus plantationsAngus J. CARNEGIE a *, Mamoru MATSUKIb, Dennis A. ... Strategyas well as Quarantine procedures. There were several areas inBrazil, that have moderate areas of Pinus plantation (e.g., MatoGrosso do Sul (~ 64 000 ha), Amapá (~ 80 000 ha) and Para(~...

Báo cáo lâm nghiệp: " On the niche breadth of Fagus sylvatica: soil nutrient status in 50 Central European beech stands on a broad range of bedrock types" potx

... 355c INRA, EDP Sciences, 2006DOI: 10.1051/forest:2006016Original article On the niche breadth of Fagus sylvatica: soil nutrient status in 50 Central European beech stands on a broad range of bedrock ... among the sites than do actually exist in the main rooting horizon. A major disadvantage of our study is the lack of appropriatedata on N availability in the soils. Although N mineralizationrate ... 0.02(Ca + Mg + K)tand base saturation in the mineral soil are key factors for the accumulation of C and N in the organic layer. The total pool of phosphorus was particularly large in the organic...

Báo cáo lâm nghiệp:"Predicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub species after fire" doc

... hightemperatures favoured the germination of Genista florida.Therefore, a balance between the elimination of competitor shrub species and the stimulation of the germination of Pinus sylvestris seeds must be ... 2002076Original articlePredicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub species after fireMê Rosario Nuñeza, Felipe Bravoa and Leonor Calvob*a ... probability of germination was studied in the laboratory for Scots pine (Pinus sylvestris) and four shrub species characteristic of the understory in Scots pine stands in northern Spain (Cistus laurifolius,...

Báo cáo lâm nghiệp:"Growth and biomass partitioning of Fagus sylvatica L. and Quercus robur L. seedlings in response to shading and small changes in the R/FR-ratio of radiation" pot

... 10.1051/forest:2003009Original articleGrowth and biomass partitioning of Fagus sylvatica L. and Quercus robur L. seedlings in response to shading and small changes in the R/FR-ratio of radiationChristian ... seedlings of Fagus sylvatica L., Tree Physiol. 17 (1997) 133–140.[52] Welander N.T., Ottosson B., The influence of shading on growth and morphology in seedlings of Quercus robur L. and Fagus sylvatica ... material. The seeds weresown into a permeable pot of 2000 cm3 in size and the seedlings stayed there to the end of the experiment. The rooting substrateconsisted of a mixture of peat and agriperl...

Báo cáo lâm nghiệp: "Predicting solar radiation transmittance in the understory of even-aged coniferous stands in temperate forests" ppt

... characteristics, the time since last thin-ning τ and the thinning intensity I were retained for this study. Thin-ning intensity I is defined in terms of basal area, being equal to the ratio of absolute ... since thinning increased (data not shown).Thus the influences of stand age, time since last thinning andintensity of last thinning on extinction coefficient b (relation-ship (2)) were further ... lines: thinning of intensity = 0.5, 3 years ago.Parameter agemax was set at 20 years. Solar radiation in coniferous stand understory 639within 10 m, possible due to the light extinction induced...

Báo cáo lâm nghiệp: "Modelling the biomechanical behaviour of growing trees at the forest stand scale. Part I: Development of an Incremental Transfer Matrix Method and application to simplified tree structures" pptx

... 2004DOI: 10.1051 /forest: 2004019Original articleModelling the biomechanical behaviour of growing trees at the forest stand scale. Part I: Development of an Incremental Transfer Matrix Method and ... and efficient method to simulate the biomechanical behaviour of growing trees. Nevertheless, the use of numerical methods at the forest stand scale, i.e. on a largenumber of trees, necessitates ... Biomechanics of trees in a forest stand 2672.3.2. Incremental transfer on element The matrix relation, which allows the incremental state vector on the left of node to be expressed according to the...

Báo cáo lâm nghiệp: " from the simple application of a mixture of to more gibberellins integrated explanations" pot

... which had more basic ones. A similar distribution wasobserved in tobacco (Cabanne et al.,1977).These biochemical changes of earlystages of initiation have yet to be verifiedin ... treesmakes the sampling problem for biochemi-cal studies on the early steps of flowering a crucial one. Another approach to thisproblem is to find a biochemical markerthat ... may accompany all the treatments, including the GA4/7 injec-tion. Still, there seems to be no apparentrelationship between ABA content andflowering response. Axillary apices...

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