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Banská Bystrica, Slovakia

In four mixed selection forests of northwestern Carpathians (Slovak Republic) we analysed the structure and height growth of Norway spruce (Picea abies IL.I Karst.) and Silver fir (Abies alba Mill.) natural regeneration. In the period 2002-2004, the diameter structure of the stands (all living trees of dbh>8 cm) was assessed in each research object. Moreover, in the series of 104 square sample plots with the size of 100 m2, the density of natural regeneration (individuals of dbh<8 cm) was recorded. For the older saplings (h>1.3 m, dbh<8 cm) the following characteristics were measured: height (H), crown width (CW), length of living crown (CL), diameter at breast height (dbh) and height increments of the last 10 years (HI). Subsequently, the derived characteristics were calculated: relative crown length (RCL), crown width ratio (CWR), mean increment during the last three years (MHI) and relative growth ratio (RGR). The influence of temperature and precipitation on the height growth of Norway spruce and Silver fir was analysed using the modified standard index chronology. The average density of natural regeneration in particular research objects ranged between 9,054±4,012 ha-1 and 23,720±11,705 ha-1 . The proportion of older saplings was only 6-17% (11% on average) from the total regeneration density. Compared to Norway spruce, Silver fir reached significantly higher (p<0.01) values of MHI and RGR in most cases. Correlation and regression analysis confirmed moderate to strong correlation between the standardized indices and mean temperature or precipitation in selected periods (Rmax = 0.34-0.66 and 0.15-0.75, respectively).

The paper presents results of seeding experiment of sliver fir (Abies alba Mill.) and Norway spruce (Picea abies L. Karst) in the selection forest. There is still a lack of knowledge about the germination and survival of seedlings in the differentiated forests. The experiment was performed in a managed forest with the selection structure. We established 24 sowing plots in the altitude 960-1050 m a.s.l., north exposure. One hundred of germinative seeds were sowed per one 1 m × 1 m plot. The level of direct and diffuse radiation and share of canopy gaps were measured on each of sowing plots. We analyzed the effect of applied tree species, different soil treatment, date of sowing and light environment on the abundance of germinated and survived seedlings. In addition, we studied the impact of climate conditions (average day temperatures and precipitations) on the seeds germination as well. The analysis revealed the direct effect of climate factors on the survival of spruce seedlings. We recorded the precipitation deficiency of 40 mm during the monitored 42 days that closely corresponded with the highest-recorded mortality of spruce seedlings (73 %). In time of the first inventory, the total amount of spruce seedlings was almost twenty-fold higher than the number of germinated firs. However, in time of the last inventory, the abundance of fir seedlings was 3.5 times higher than that of spruce seedlings. The different level of neither direct and diffuse radiation nor openness affected directly the average number of survived seedlings.

Agency: Cordis | Branch: FP7 | Program: CSA-SA | Phase: ENV.2007. | Award Amount: 1.17M | Year: 2008

The Project ClimateWater is aimed as the first step on the analysis and synthesis of data and information on the likely (known, assumed, expected, modelled, forecasted, predicted, estimated etc.) water related impacts of the changes of the climate with special regard to their risk and to the urgency of getting prepared to combat these changes and their impacts. The Project will identify all adaptation strategies that were developed in Europe and also globally for handling (preventing, eliminating, combating, mitigating) the impacts of global climate changes on water resources and aquatic ecosystems, including all other water related issues of the society and nature. Research needs in the field of climate impact on the water cycle and water users will be identified with special regard to enable the ranking of adaptation action in the light of the magnitude of impact on water resources and the urgency of the action needed. The most important output of the project will be the identification of gaps that would hinder the implementation of the EU water policy in combating climate impacts on water.

St'astny P.,Slovensky hydrometeorologicky ustav | Polcak N.,Slovensky hydrometeorologicky ustav
Geograficky Casopis | Year: 2011

Evaluation of the effects of geographical factors on the wind condition in the specific area is based on the geographical location of the area and the general circulation of the atmosphere and specific local circulation patterns. Various topographic forms and altitude spectra of the area and surroudings, the active surface roughness, vegetation type, urban areas and water bodies influence them. Specific thermodynamic conditions resulting from seasonal changes in the circulation patterns are included among the geographic factors. © Institute of Geography SAS.

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