Báo cáo lâm nghiệp: "Influence of light and competition on crown and shoot morphological parameters of Norway spruce and silver fir saplings" doc

... spp. and Brachipodium pinnatum. The effects of light level and competition on growth and on crown and shoot morphological parameters were assessed for 76 saplings (48 Norway spruce and 28 silver ... traits [13], and possibly in allocation pat- terns, but not to morphological ones. 4. CONCLUSIONS Results of the present study confirm the importance of...

Ngày tải lên: 08/08/2014, 00:21

... July of each year in question. e growth of spruce is also affected to a statistically significant degree by precipitation in July of the previous year and by precipitation in February and March of ... 2008. Health condition of spruce stands in the Orlické hory Mts. in relation to climatic, anthropogenic and stand factors. Journal of Forest Science, 53: 1–12. Received fo...

Ngày tải lên: 07/08/2014, 03:22

... sections t 4 + t 5 , SWD of t 7 disc to sections t 6 + t 7 and SWD of disc from 1/10 of H to internodial sections t 8 and below. Methodology for stem volume calculation was based on the ... nutrient optimization and fiber dimensions. Canadian Journal of Forest Research, 32: 185–194. MURTHY R., DOUGHERTY P.M., 1997. Effect of car- bon dioxide fertilization and irrig...

Ngày tải lên: 07/08/2014, 03:22

... 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 influence on forest ... Table 6. Proportion values of nutrition elements to N (=100%) in dry mass of leaves (the 1 st section of the table) and basic cation ratios in the leaves (the 2 nd sectio...

Ngày tải lên: 07/08/2014, 04:20

... 505–515 developments of height increments of trees and con- tent of foliar P (correlation coefficient r = 0.73) and S (r = 0.58). A significant negative correlation between height increment and content of foliar ... Distribution of macroelements and heavy-metal accumulation. Scandinavian Journal of Forest Research, 14: 64–77. BRAHMER G ., 1994. Effects of whole catchment...

Ngày tải lên: 07/08/2014, 10:22

... treatment, ammonium concentrations in tap- root and nitrate concentrations in leaves remained below the detection threshold of the colorimetric method. 3.3. Numeration of bacteria The number of total ... while stem biomass of first and second flushes remained unaffected (Tab. I). Root biomass accumulation was strongly decreased during flooding and reached only about 34% of the...

Ngày tải lên: 08/08/2014, 00:22

... evolution of average values of e y , g R and d f in function of temperature. Deformation criterion from compression test ( e y ), first decreases slightly from 1.9% to 1.7% between 25 and 45 °C and ... in function of temperature for one wood species (Dicorynia). Each cross represents one value of the three repetitions. Figure 7. Illustration of the model of evolution of...

Ngày tải lên: 08/08/2014, 01:21

... the afforestation of farmland using direct seeding of beech and oak. Firstly, there was no effect of competition from herbaceous vegetation on seedling growth during the first year. In addition, competition ... 34]. One type of restoration activity is afforesta- tion of abandoned farmland. Here, planting of bare-rooted seedlings is the common practice. It is an expensive m...

Ngày tải lên: 08/08/2014, 01:22

... inhibition of growth caused by the addition of NaCl with no additional protection at higher concentrations. We have shown very similar results of salt (NaCl) on the growth of larch, sitka spruce and ... and oak (results not shown). 3.2. Influence of proline in relation to concentrations of NaCl Figure 2 shows the growth rate of larch embryogenic cul- tures grown in vary...

Ngày tải lên: 08/08/2014, 01:22

... adaptations: great production of cones, serotinous cones and thick bark. After forest fires, high-density regeneration stands are common. Sierra de Oña provenance is isolated from other populations of ... this area is based on natural regeneration with a rotation of 100–125 years. Forest fires have a strong influence in stand dynamics in the area. Stands have adapted to fires and,...

Ngày tải lên: 08/08/2014, 01:22