Báo cáo lâm nghiệp: "Evaluation of new silvicultural alternatives for Scots pine stands in northern Spain" pot

... retained and the kind of mixed stand [33]. Finally, other recent studies concerning silvicultural aspects of Scots pine (Pinus sylvestris L.) without including GTR can be founded in Mörling [22] ... different silvicultural alternatives. The yield model was elaborated for Scots pine stands in northern Spain using 75 temporary plots from the Sec- ond National Forest I...

Ngày tải lên: 08/08/2014, 01:22

... of the thinning operations. In addition, data from the first and second measurements of two thinning trials installed in a 12-year old stand of radiata pine were also used. Each thinning trial ... model for radiata pine plantations 613 identical for all the measurements belonging to the same unthinned growth period within a single plot, hereafter the individual being in- ve...

Ngày tải lên: 07/08/2014, 16:21

... of its presence in forests at high altitudes than in the lower forest zone. Differences in the content of macroelements in the ages of needles under analysis indicate unfavourable changes of ... disturbances in mineral economy in spruce growing in the area in question. In the case of the ratios S:Ca and S:Mg in one-year-old spruce needles, the disturbance bec...

Ngày tải lên: 07/08/2014, 10:21

... longleaf pine stands, respecti- vely. In fact, the evolution of dominant diameter in control (unthinned) and thinned plots was checked, observing a slight increment in this variable in thinned plots. ... dif- ferent set of parameters for each ecoregion is needed. 3.3. Effect of thinning in height-diameter relationship In the study of the effect of thinning in h-d...

Ngày tải lên: 08/08/2014, 00:22

... (stand-forming) function in forest ecosystems at higher mountain locations; therefore it is desirable to assess real potentials of this tree species in order to increase the tolerance of newly ... established in the last years mainly for the purposes of silvicultural research, i.e. successful artificial forest regeneration in extreme mountain conditions and formation of...

Ngày tải lên: 07/08/2014, 03:22

... (22%).  ese forests form rather a narrow green belt bordering the northern part of the Alborz Mountains and ex- tend from Astara in the west of Gilan Province to Giledarreh in the east of Golestan ... S A. (2009): Mechanized logging systems and timber products in the Hyrcanian Forests of Iran. In: Proceeding of Formec Meeting, International Sym- posium on Forest M...

Ngày tải lên: 07/08/2014, 10:21

... surroundings of the D1 motorway was found. Forests accounted for 14.72% of the area of interest in 1949, and in 2007 that was already 21%. e biggest change of variability in the size of category ... anthropogenic pressure in uencing the landscape structures in the vicinity of the linear construction in the form of a motorway, and especially due to the accompan...

Ngày tải lên: 07/08/2014, 10:21

... ca 2ha in size). One of the objectives was to investigate the in uence of specifi c sorting in a forest nursery on the growth and stability of out- plantings of Norway spruce mountain populations. ... seedlings were outplanted. In 1992, before transplanting, two-year seedlings originating from the 8 th for- est altitudinal zone (FAZ) (designation of origin: B/SM/0001/...

Ngày tải lên: 07/08/2014, 10:21

... the main reason and in the case of fl oodplain wood- land the grain size of the sediments can also be con- sidered. Also the in uence of diff erent silvicultural treatments of plants in the ... to be the slow- est growing. Mode 2 (crown in the upper third of the stem) entirely prevails for the type of branching. Only in the case of provenance 30 the majority of...

Ngày tải lên: 07/08/2014, 10:21

... fitting of the distribution because more information is used than in the MOM. CONCLUSION In this study, the good results of the MOM in terms of the number of times for the lowest values of MSE ... určenie parametrov Corresponding author: Prof. Dr. Y L, Research Institute of Resource Information and Techniques, Chinese Academy of Forestry, Beijing 100091, China,...

Ngày tải lên: 07/08/2014, 10:22