Báo cáo lâm nghiệp: "Variability of cutting regimes in small private woodlots of south-western France" pot

... edge of P-1). The regeneration of the stands is always natural (shoot + seedling); no planting was identified in the woodlots studied. Clearing, thinning of seedlings, early thinning and pruning were ... particu- larly concerning the density of the maintained standards, but were often in the framework of a cordial relationship. Cutting regimes in small forest 927 [20] G...

Ngày tải lên: 07/08/2014, 16:20

... of rings from cambium Number of rings from cambium Number of rings from cambium Number of rings from cambium Height (m) Height (m) Height (m) Height (m) CW SWRSWL OW Fig. 3. e in uence of ring ... proportion of pixels with compression wood in the entire image gave us the final result of the proportion of compression wood in the sample. e samples from the CW zone which...

Ngày tải lên: 07/08/2014, 03:22

... parallel to grain, and also the level of the deformation of conifers, depends pre- dominantly on the interconnection of individual tra- cheids. e strength mainly depends on the S2 layer of the secondary ... proportion of lignin and the propor- tion of late wood. Compression strength of wood parallel to grain decreases with the degree of grain deflection from the longitudina...

Ngày tải lên: 07/08/2014, 04:20

... part. Peeling and brows- ing are classified into one category. During fraying trees are damaged by antlers of ungulate game. e assessment of peeling and browsing intensity was carried out in two ... browsing of terminal shoot, by fraying or by peeling and browsing by ungulate game. Peeling and brows- ing of trees with dbh 7–11.9 cm were related to the inventory circle with the...

Ngày tải lên: 07/08/2014, 03:22

... Results of logistic regression, evaluating estimated in uence of searched factors to the critical damage oc- currence in all study regions. Signs of b i indicate whether increasing value of factors ... Corectness of classifi cation on independent data (Kysuce region, n = 286) 85.7% 1 % of removed timber stock in the forest compartment since the beginning of the analyzed pe...

Ngày tải lên: 07/08/2014, 10:21

... numbers of formed cells. The beginning of the longitudinal axial parenchyma formation was determined in young trees on May 14. In old trees this activity was seen a week later. The influence of ... the periodical sampling was performed in weekly intervals. In our research, the start of the formation of new early phloem cells was observed at the beginning of April. In...

Ngày tải lên: 07/08/2014, 10:21

... in initial soils in spoil banks following the mining of lignite may be con- nected with the participation of carbon of geological origin. Based on studies in a spoil bank in Piaseczno, W ... studies in Spain it was reported that the organic carbon content in upper horizons of initial soils was 3.0% already in the 5 th year from the beginning of reclaims (V...

Ngày tải lên: 07/08/2014, 10:22

... bolleana P. bolleana Populus China China China China China T1 T2 T3 T4 T5 T6 T7 Xiaoyeyang-328 Qinghaiqingyang-107 Wutaiqingyang-77 BeiJingqingyang Maoguoyang-309 Zhongqing-10 Zhongqing-48 P. simonii P. ... METHODS 2.1. Plant materials Cuttings from a single ramet of each accession listed in Table I were planted in the collection of the Research Institute of Forestry at the Chinese...

Ngày tải lên: 07/08/2014, 16:20

... procedures in which different classes of data were left out based on different characteristics (i.e. site index, growth region, year of birth and thinning intensity) resulted in only a small increase in ... number of mea- surement occasions totalled 2065. The data included a wide range of different treatments in terms of initial spacing and thinning practices from unthinned c...

Ngày tải lên: 07/08/2014, 16:21

... layer of sand, clay and mixed rubble. Hardwood cuttings (25-cm long) were planted in a double-row de- sign with alternating inter-row distances of 0.75 m and 1.5 m, and a spacing of 0.9 m within ... be- cause of its rapid juvenile growth, high photosynthetic ca- pacity [5], and large woody biomass production in a single growing season [6, 28, 29, 36]. The increasing interest in...

Ngày tải lên: 07/08/2014, 16:21