Báo cáo lâm nghiệp: "Optimising the management of even-aged Pinus sylvestris L. stands in Galicia, north-western Spain" ppt

... 57–62 Because 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 59 Table 1. Survey of studied web-spinning sawflies...

Ngày tải lên: 07/08/2014, 03:22

... (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...

Ngày tải lên: 07/08/2014, 03:22

... thinning intensity depends on the number of the thinning, the intensity increasing from the first thinning to the fourth. The intensity of the first thinning is around 20% of basal area, and in the ... (% of number of trees); ◦ Percentage of low thinning (% of trees removed after system- atic thinning). – For the other thinnings ◦ Number of years since the...

Ngày tải lên: 07/08/2014, 16:21

... 747758 â INRA, EDP Sciences, 2005 DOI: 10.1051/forest:2004071 Original article Optimising the management of uneven-aged Pinus sylvestris L. and Pinus nigra Arn. mixed stands in Catalonia, north-east ... The effect of discounting rate and length of the cutting cycle on the optimal management of mixed stands of P. sylvestris and P. ni...

Ngày tải lên: 08/08/2014, 00:21

... alterna- tives for Scots pine stands in northern Spain, Ann. For. Sci. 61 (2004) 163–169. [7] Bravo F., Montero G., Site index estimation in Scots pine (Pinus sylvestris L.) stands in the High Ebro Basin ... INRA, EDP Sciences, 2005 DOI: 10.1051/forest:2005006 Original article Site quality equations for Pinus sylvestris L. plantations in Galicia (northwest...

Ngày tải lên: 08/08/2014, 00:21

... 455 Ann. For. Sci. 62 (2005) 455465 â INRA, EDP Sciences, 2005 DOI: 10.1051/forest:2005042 Original article A stochastic height-diameter model for maritime pine ecoregions in Galicia (northwestern ... stochastic height-diameter model was developed for maritime pine (Pinus pinaster Ait.) in Galicia (northwestern Spain). Four well-known growth function...

Ngày tải lên: 08/08/2014, 00:22

... stand age when the first thinning occurs; years since previous thinning for the other thinnings; remaining basal area. For the final cutting: years since the last thinning to the first regen- erative ... 493501 â INRA, EDP Sciences, 2005 DOI: 10.1051/forest:2005054 Original article Optimising the management of Pinus sylvestris L. stand under risk of fire in...

Ngày tải lên: 08/08/2014, 00:22

... growth of dominant and codominant loblolly pine trees, the mean value of total height of dominant and codominant trees was calculated for each unthinned and once thinned stand at each location (site) ... right hand side of Equation (8) for a given set of variables. The integral of Equation (8) can also be computed online [16]. 4. CONCLUSIONS This study show...

Ngày tải lên: 08/08/2014, 00:22

... with the models rather than artefacts. A ranking of the importance of the timber quality variables on the basis of both models there- fore seemed acceptable. Among the quality variables the red ... explain timber prices achieved for high quality beech timber (Fagus sylvatica L.). The modelling starts with the assumption that among other...

Ngày tải lên: 08/08/2014, 00:22

... high temperatures 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 ... 2002076 Original article Predicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub sp...

Ngày tải lên: 08/08/2014, 01:21

... 10.1051/forest:2003002 Original article Optimising the management of Scots pine (Pinus sylvestris L.) stands in Spain based on individual-tree models Marc Palahí a * and Timo Pukkala b a European Forest Institute, ... simulation-optimisation system, SPINE, for the management of Pinus sylvestris L. stands in Spain. The simulation sub-system is b...

Ngày tải lên: 08/08/2014, 01:21

... 237 Ann. For. Sci. 60 (2003) 237245 â INRA, EDP Sciences, 2003 DOI: 10.1051/forest:2003015 Original article A height-diameter model for Pinus radiata D. Don in Galicia (Northwest Spain) Carlos ... The model of Tomé gave the best height estimates. Pinus radiata D. Don / forest modelling / Galicia / height-diameter relationship Résumé – Un modèle hauteur-dia...

Ngày tải lên: 08/08/2014, 01:21

... In the perspective of the conversion of Norway spruce plantations, there is a need for foresters to assess the potential of the natural woody species regeneration. We studied 50 Norway spruce plantations ... natural woody species regeneration for the conversion of Norway spruce plantations on alluvial soils Bruno HÉRAULT a *, Dan...

Ngày tải lên: 08/08/2014, 01:22

... by measuring the diameter of the colony estimated from the mean of two perpendic- ular diameters and expressed as a percentage of the room available for growth, i.e. the diameter of the dish. Growth ... Independently of the nature of the extraction, weight losses observed on Burkea africana blocks are weak, while beech blocks are strongly degraded. These re...

Ngày tải lên: 08/08/2014, 01:22

... further support to the hypothesis that winter frost is the meteorological variable limiting the distribution of the disease. The most

Ngày tải lên: 08/08/2014, 18:21