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 prod...

Ngày tải lên: 07/08/2014, 10:21

... this does not modify their ecological optimum, but reduces the ecological interpretation and the projected dispersion on the CCA axes. On the other Table IV. Akaike Information criteria (AIC) of ... efficiency of the ecological variables used in E for predicting the composition of the vegetation. The closer the eigenvalues of the m first axes of CCA are to the m firs...

Ngày tải lên: 08/08/2014, 00:22

... and the slow decomposition kinetic of the litter [13, 25]. Indeed, our results revealed the strong effect of the Norway spruce density on the spontaneous regeneration (Tab. II). The plantation ... seedlings. The spatial heterogeneity of the woody regeneration was rather similar in coniferous and deciduous stands. We conclude that for the development of multifunctional fo...

Ngày tải lên: 08/08/2014, 01:22

... abundances on pines. Feeding outsets were found on the edge of pine branches; afterwards they were also found on living pine stems in different parishes where the pine predominated. Most of the trees ... inciden- tally on pine in Central Europe, in the old range of its occurrence. Most probably, it still concerns only a chance occurrence in new localities with very high...

Ngày tải lên: 07/08/2014, 03:22

... compares the square root of the means of the estimates s 2 y st.post.uncond for the conditional vari- ance (1), the means of s 2 y st.post.cond as estimates for the unconditional variance ... small connected subareas. e larger connected subareas are the less is the gain in precision. e conditional as well as the unconditional variance estimator for poststratifie...

Ngày tải lên: 07/08/2014, 03:22

... 1990; V et al. 2003). On the one hand, the requirement to convert the allochthonous blue spruce stands as well as the need to refill the gaps after failed plantations is a difficult task in ... the conversion of blue spruce stands even under environmentally highly stressing conditions, (2) to assess the foliar nutrient status of the alder as a precondition of positive...

Ngày tải lên: 07/08/2014, 04:20

... vector defines the stable diameter distribution and, consequently, the long-term dynamics of the non harvested populations. On the other hand, and assuming that condition (C1) holds, conditions (C2) and ... distribution. Condition (C3), to- gether with conditions (C1) and (C2), define the harvesting strategy for the model, and are formulated as follows: (C1) A necessary condition...

Ngày tải lên: 07/08/2014, 16:21

... varying by their drying properties and therefore permeability of their dry film are compared as boron retention agent. The impact of these combinations is evaluated for boron retention and biological ... drying and consequently regarding boron leaching. Except a small increase of retention for wood treated with a 1.0% boric acid solution, boron concentration has no im- pact on amount of bo...

Ngày tải lên: 07/08/2014, 16:21

... influences more the occurrence and the length of the zones than the axes composition of each zone. The length of every zone was modeled as a function of the length of the whole annual shoot. These parameters ... dis- tribution of events as a function of the position make it possible to evaluate the dynamics of the phenomenon studied, such as the locations of the main tr...

Ngày tải lên: 07/08/2014, 16:21

... have shorter rotation lengths. Secondly, the higher is the number of trees per hectare the longer are the optimal rotation lengths. Thirdly, increasing discounting rate shortens optimal rotation ... employed to compute the intensity of thinnings along the rotation of the stands. The graphs obtained (Fig. 9) show that the thinning intensity depends on the number o...

Ngày tải lên: 07/08/2014, 16:21