Milan Knezevic

Nickel content in plants and soil in the area of the protected natural resource “Avala” - Belgrade

The purpose of this research is above all focused on the aim of determining the load of ecosystem or rather soil and plants with the heavy metal Ni and the level of accummulation in this area so that on the basis of the obtained results adequate protection measures could be timely taken. The research of nickel (Ni) content in the leaves of herbs and woody plants growing under urban conditions in comparison with the nickel concentrations in the plant leaves in the protected natural resource “Avala” (16 km away from Belgrade) indicates that the recorded values of nickel concentrations by locations are statistically significantly different and range from A to F on locations 1, 2 and 3 while on location 4 in urban conditions the values range from A to B in accordance with Duncan’s Test.

Organic carbon stock in some forest soils in Serbia.

The content of organic carbon (C) was researched in topsoil layers (0-20 cm) in the most represented soils of forest ecosystems in central Serbia: eutric ranker, eutric cambisol and dystric cambisol. The soils were sampled during 2003, 2004 and 2010. Laboratory analyses included the soil physical and chemical properties necessary for the quantification of the soil organic carbon in organic and mineral layers. Mean values of the soil organic carbon (SOC) stores in organic horizons of the study soils varied between: 1.01±0.4 kg(C).m-2 (dystric cambisol), 0.90±0.41 kg(C).m-2 (eutric ranker) and 0.94±0.36 kg(C).m-2 (eutric cambisol). Average values of organic carbon in mineral layers (0-20 cm) ranged between: 3.83±1.70 kg(C).m-2 (dystric cambisol), 6.26±3.41 kg(C).m-2 (eutric ranker) and 4.36±1.91 kg(C).m-2 (eutric cambisol). The average value of total organic carbon stock in the study soils (both organic and mineral layers) was 5.77 kg(C).m-2. This paper addresses the methodological aspects of regional estimation of soil organic carbon content as the potential to be applied in the National Forest Inventory Program.

Soil pro pert ies in sessile oak fore sts (Quercetum montanum typicum Čer. et Jov. 1953) in the are a of Fruška Gora

The soils formed on sandstones in sessile oak forests (Quercetum montanum typicum Cer. et Jov. 1953) were researched in the area of Fruska Gora. On permanent sample plots established in management units “Cortanovacka Forest-Hopovo-Velika Remeta“ and “Beocin-Manastir-Katanske Livade-Osovlje“, in the are of NP “Fruska Gora“, aiming at the monitoring of the effect of light regime on the development of sessile oak progeny in the given environmental conditions, based on the morphogenetic characteristics of the soil and analytic values of the soil properties, and based on the soil classification by Skoric et al. (1985), the following two soil types were defined: acid brown soil (dystric cambisol), and illimerised soil (luvisol). Acid brown soil belongs to the form of medium deep soils, and illimerised soil is classified as deep soil.

Characteristics and variability of dystric brown soils in posavsko forest economic district

The paper presents a statistical analysis of the basic chemical characteristics of dystric cambisol, its depth and clay content in Posavsko forest economic district. The aim was to define the influence of pedogenetic factors (primarily parent rock) on the characteristics of dystric cambisols, using statistical analysis. The analysis was based on the data from the Interpreter of Soil and Typological Maps of Posavsko forest economic district. 35 soil profiles were analyzed. A and (B) horizons were analyzed separately, then compared with each other in terms of similarities and differences. Variability is greater in the A horizon. The values of variability, analysis of variance, linear and multiple regression, correlation and cluster analysis were determined. Three main subtypes were defined based on the results of chemical characteristics, depth, and clay content, namely: leached (4 profiles), humus (1 profile) and typical (30 profiles). The results show that the properties of this soil type are significantly influenced by the character of parent material.

Assessment of production potential of podzolised and typical acid brown soils in some forest types in the area of Veliki Jastrebac

The characteristics of podzolised and typical acid brown soils were studied in beech forests in Management Unit “Lomnicka Reka“ on Veliki Jastrebac. Also, their production potential was evaluated based on their physico-chemical properties. As productivity is a realised value of the soil fertility, realized through the yield and increment, the site productive capacity was evaluated based on mean maximal heights. The correlation analysis shows the extent to which the characteristics of podzolised and typical acid brown soils affect the mean maximal heights.

Production potential of the soil and the basic elements of productivity of the most widely spred sessil types in the u. N.P. „Đerdap”

This paper is on the results of the soil and its production potential in the types of forests of sessile oaks (Quercus petraea) in the area of the National Park „Đerdap” in the community units of Zlatica, Đerdap, Strbacko korito, Desna reka and Kožica. There are the most widely spread types of the sprout forests of the sessile oaks in the research area, deep deluvium, luvisoil, eutric cambsoils, and a great number of subtypes of acid brown soil. Considering the fact that the production potential of the defined types of soil depends on the depth, skeleton and other physical characteristics which determine acception, keeping and moving of water and this means that the production value of the studied soils is in the direct correlation with physical-geographical conditions of the environment. Taking into account that solum is well developed and the low contents of skeleton, all the studied soil in the most widely spread types of sessile oaks in the area of N.P. „Đerdap”, are very productive natural habitats. The exception is acid brown soil, which characteristics vary as well as their production potential. Apart from a good production potential of the studied soils within this paper, sessile forests in the researched areas irrationally use production potential of the habitat. In the research area in the last 20 years, the processes of devitalizing and the appearance of decaying of sessile oaks are expressed. In the sessile forests of Serbia, there are forests of the production and protection character, and the structure of the sessile forests at global level is characterized by not normal state with domination of middle aged and in great extent mature withering ingredients, what is the main cause of insufficiently used good potential of the soil.

Heavy metals in the organic soil layer of beech forests in Serbia

During the last decades, forest ecosystems have been strongly exposed to the effect of different harmful pollutants, especially from the atmosphere. Harmful substances from the air, in addition to the direct effect on forest trees, also deposit in the soil, and have an adverse effect on soil chemistry and pedogenetic processes. The results of previous studies in Serbia (Kadovic, Kneževic, 2002, 2004) show some specificities regarding the accumulation and migration of heavy metals in the soil. The highest concentrations were found in the layers of forest litter and in the surface organo-mineral horizons. This paper presents the results of the study of heavy metal contents (Zn, Mn, Cu, Fe, Cd, Pb, Ni and Cr) in the organic horizon (forest litter) of beech forests in Serbia. The study of the heavy metal content in the organic horizon (forest litter) is very significant primarily in the aim of monitoring the trend of their migration through the soil profile and the effect on the soil properties and genesis. The soil quality in beech forests in Serbia was assessed within the Project ICP Forest, Level I, by the methodology UN/ECE-EC, 2000.