Kostadin Broshtilov, Maria Broshtilova

Oak Forest Experimental Station â€“ Burgas

This dendrary is situated within the peripheral sub-region in the Mountain of Strandzha, on the territory of the State Forestry of Tsarevo. The soil humidity has been studies as on 10, 30, 50, 80 and 100 cm under 15–20-year old plantations consistingof Pinus nigra Arn., Cedrus atlantica Man., Cypressus semepervirens L., Quercus robur L., Quercus petraea Liebl., Quercus frainetto Ten., Quercus cerris L. and Fagus orientaiis Lipsky, within the period as from 2004 up to 2008.

Within that same studied period, the rainfall quantity occurred on the territory of Pismenovo dendrary has varied from 516 up to 819 mm. There is a great dynamics in the precipitation regimen, though, its quantity and distribution has been considered enough to cover the needs of all and any of the examined species. In single years, some of the above mentioned species have suffered temporary difficulties only, in July and August.

The greatest quantity of moisture in the soil remains under the ecosystem consistingof Cerris species (Turkish oak), while amongthe coniferous species it remains under the ecosystem consistingof black pine. The soil humidity has been exhausted slightly greater under a part of the rest species, though, no significant differences have been observed. There are the ecosystems consistingof an older natural oak trees and Atlas cedar where the most evident dryingup of the soil occurs.

As about deciduous species ecosystems, the soil humidity arrives at its lowest values in August while in ecosystems comprisingthe deciduous ones it occurs in September. The minimal values seldom join the wiltingpoint soil humidity (WPSH).

No significant difference has been found out between the quantity of the exhausted soil humidity in the open air (on a glade or meadow) and the quantity of the exhausted soil humidity in plantati ons.

Vela Veleva, Hristina Marinova

Trakia University â€“ Stara Zagora

The present study aimed to analyze the morphological traits and the mechanical composition of soil resources from alluvial meadow and diluvial meadow soils in the Stara Zagora region. The study was performed at two depths â€“ 0–20 and 40–60 cm in cultivated land. A variation in soil colour from grey to grey-dark brown was observed. Alluvial meadow soils were poorly differentiatedwhereas diluvial meadow soils â€“ not differentiated. Recommendations for conservation andimprovement of the fertility of available soil fundwere made according to data about the most important soil fertility traits.

Ludmila Malinova

University of Forestry – Sofia

The purpose is comparative analysis of the chemical composition of litterfall, litter and soil and assessment of changes in their quantity passing from one component to another. Selected objects have different adsorption capacity for organic matter entring in the soil – very low in stationary sample plot Vitinia is and very high in St. Oriahovo.

The absence of solid adsorbent in sandy clay loam soil from beech ecosystem (Vitinia) is prerequisite for significant lowering of quantity of elements entering in soil with litterfall. Most strongly is changed manganese – 15.7 fold, next is potassium – 10 fold, nitrogen – 8.9 fold, calcium – 4.2 fold, phosphorus – 3.5 fold, magnesium – 2.3 fold. Insignificant are changes for copper, zinc and sodium – from 1.2 to 1.3 fold.

In clay soil from oak ecosystem (St. Oriahovo) with solid adsorbtion capacity quantity of elements entering in soil with litterfall are increased – for magnesium 5.8 fold, zinc – 3.9 fold, copper – 3.2 fold, manganese – 2.4 fold.

Litter in forest stand is effective adsorbent. It retains and accumulates sifnificant quantuties of elements entering in soil with litterfall, but this adsorption capacity depends on soil as an adsorbent.

Elena Tsvetkova

University of Forestry – Sofia 

The article presents the results of statistical processing and dataanalysis for the content of macro- and microelements in brown forest soil (Dystric-Eutric Cambisols) from the region of the Western Rhodopes, Yundola Experimental Station G. St. Avramov. The main parametric and non-parametric statistical indicators and the coefficient of variation (CV%) for each set of 81 samples were calculated. In order to reduce the significant deviation of frequency distribution of datafrom the Normal distribution, grouping by edificatory tree species was made. It was found that the clustering of samples according edificatory tree species has asubstantial influence over the normalization of the frequency distribution of datafor pH and content of organic Cand P in Scots pine and Norway spruce. According to the criteriaof ICP-Forests, for each sample plot soil richness was evaluated. 

Elena Zheleva, Paunka Bozhinova, Milen Venelinov

University of Forestry – Sofia

Study the environmental conditions in the areaof mining cinder tips Anthrawhich is located in Western Stara Planina mountain – Svoge coal basin.

Climatic and edaphic conditions are analyzed, which are essential for the size, terms and effectiveness of agricultural and reclamation activities, growth and development of vegetation, and hence to the overall success of reclamation activities.

Reclamation of damaged areas will be conducted with soil material from adjacent land, which are collected at alandfill or derived from appropriate nearby areas or construction sites.

Soil properties of these materials and bulk substrates were examined before detailed design of the reclamation, especially on the quantity of humus in them, the main nutrients, acidity and sorbtsionniyacapacity. The presence of some unfavorable characteristics requires reclamation to be conducted with increased rates of grass blends to create meadows and pastures and greater density of planting of sets in forest biological reclamation.