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

... 355 c  INRA, EDP Sciences, 2006 DOI: 10.1051/forest:2006016 Original 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 appropriate...

Ngày tải lên: 08/08/2014, 00:22

... mining and the reclamation of post-min- ing areas have a long tradition in the Lusatian region in Eastern Germany. Nowadays, the active open- cast mines extend over a total area of more than ... 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...

Ngày tải lên: 07/08/2014, 10:21

... species in the southeastern United States at 186 locations. At the time of initial plot establishment, the stands averaged 14 years in age (defined as years since planting). Plot locations ranged ... expansion of the lower crown after thinning. Equation (8) can be applied to estimate height (Y 2 )atage A 2 if the height (Y 1 )atageA 1 , basal area ratio (I), and the age...

Ngày tải lên: 08/08/2014, 00:22

... years. The remaining basal area was always practically the same for a given thinning year. The results indicate that the optimisation method was able to find the maximal SEV and optimal rotation ... hectare indicating that there had been a pre-commercial thinning in each stand (as was assumed in the calculation of soil expectation value). The plots were measured duri...

Ngày tải lên: 08/08/2014, 01:21

... consequence of the Common Agricultural Policies of the European Union of the last fifty years, former alluvial meadows annually mown either have been abandoned to natural coloni- sation or have ... 10.1051/forest:2004057 Original article Assessing the potential of natural woody species regeneration for the conversion of Norway spruce plantations on alluvial soils Brun...

Ngày tải lên: 08/08/2014, 01:22

... 139–148 Poststratification is well known as a means of increasing the precision of estimates in unstratified sampling by incorporating additional information about strata weights in the final estimator. In ... is is an additional source of variation. Poststratification is usually applied when addi- tional information about strata sizes is available. In the ideal case...

Ngày tải lên: 07/08/2014, 03:22

... shows a method to estimate the sustainable har- vest rates and the stable diameter distributions of three qual- ities of Fagus Sylvatica L. in the managed pure uneven-aged stands of Navarre (Spain), ... uneven-aged managed beech (Fagus Sylvatica L.) stands in Navarre (Northeastern Spain), using projection matrix models. 2. MATERIALS AND METHODS 2.1. Study area and fi...

Ngày tải lên: 07/08/2014, 16:21

... 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 potential of Atlas cedar to vary- ing environmental conditions ... decrease the mechanical strength properties and are a drawback for most of wood trans- formations and valorization processes. The size and the spatial arrangem...

Ngày tải lên: 07/08/2014, 16:21

... sylvestris stands in Galicia date back to the great reforestation effort that took place in Spain in the 1940’s by the Spanish administration. The stands are therefore younger than 60 years, half of them ... 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 fo...

Ngày tải lên: 07/08/2014, 16:21

... began from the best of 500 0 random com- binations of decision variables. The step of changing the values of DVs was initially 10% of a user- specified range, and the step was gradually decreased ... Pinus nigra Arn. mixed stands in Catalonia, north-east Spain Antoni TRASOBARES a *, Timo PUKKALA b a Centre Tecnològic Forestal de Catalunya, Pujada del seminari s/...

Ngày tải lên: 08/08/2014, 00:21