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The sessile oak is the widest spread species of all autochthonous oaks species in Romania, forming a lower level of vegetation. The purpose of this study is to analyze the variability of leaf nutrients, as well as of soil nutrients, for two sessile oak stands situated under different forest site conditions. These two stands are located on the same type of soil: luvisol. As such, four soil profiles were realized for analyzing soil properties. Leaves samples were collected from twenty sessile oak trees, during three...

The research was carried out in the meadows ecosystems in the Bazo? forest park, located between Timis and Bega rivers and in the Cornetu forest, situated in the meadow of the Arges river. In each 1 ha survey area, information on the biometric features of component trees was collected and increment core samples were extracted. The purpose of the research was to know the structure and the functioning of the specified crop stands and the elaboration of the dendrochronological series for pedunculate oak and common as...

Created for the purpose of stabilizing the tailing dumps from Moldova Noua against wind erosion, the forest plantations successfully fulfill theirs eco protective role. The arrangement of plantations along the slope or plateau of tailing dumps are determining a different development in vertical and horizontal structure, depending on density, composition or site conditions. The structure study of the stands from tailing dumps was made by processing data obtained from sample surfaces located on the plateau or slope ...

Large reserves of forest resources (according to UN estimates, the area of forests in the Russian Federation, is 8.5 million km?) have provided a significant development of the forest industry. Together with large investments in the timber industry complex, it became possible to optimize the technological processes, machines and equipment of enterprises. At the same time, it is also necessary to solve the issues of the most rational forest management. Sustainable forest management assumes limiting of the volume of...

The paper presents observations of solution of the sustainable forestry problem in terms of the Arkhangelsk region. One of the sustainable forestry guidelines is appropriate restraining of the forest harvesting. The volumes of logging in the Arkhangelsk region constitute about half of the allowable wood removal. One of the reasons of the harvesting volumes insufficiency is low density of forest roads network, therefore the accessible areas alongside the existing roads are depleted. The forest roads network should ...

This work, which was conducted in the Chettaba forest, focuses on the sylvicultural treatment of Pines during its first natural regeneration. It will ultimately emphasize the importance of forestry sustainability. This sustainability consists of the rational management that should begin right after the exploitation as well as during all stages of growth. In fact, it appears that during the past couple of years, forestry exploitation seems to occur in destructive and illegal ways and that restoring processes are no...

The paper presents and analyses different solutions to determine the alignment to be taken into account in designing forestry roads in order to prevent and remove the effects of natural calamities. The proposed solutions take into account the area of the forestry roads in order to integrate them harmoniously in the region landscape. The paper also presents a case study concerning the solutions adopted to remove the effects caused by the natural calamities in the summer of 2016 on certain forestry roads in the Timi...

The aim of this study is to estimate the outcome of special cutting method developed for old pine stands in Riga?s forest park Mezaparks. Its topicality is defined by the increase in urban population, cities? areas, and green spaces there. The functions of cities? green areas are specific and it is very important to develop and evaluate special methods of forest management for urban forests. The research was carried out in the forest park Mezaparks, in a 183-year old Scots pine stand with an area of 4.32 ha, where...

The climatic changes effects manifested through extreme meteorological phenomena (wind, temperatures, precipitations) are highly affecting forest vegetation. A rare meteorological phenomenon (freezing rain), associated with an intense wind was encountered in 2015 towards the end of the vegetation season (October, while the leaves had not fallen yet). This phenomenon has caused important damages in the common beech stands located in Romania?s Sub Carpathians. The present paper presents the results of investigations...

References to theoretical research of aerostatic bearings and the method of their analysis for choosing options of aerostatic direction are provided. The calculation is done by means of a numerical method based on the field pressure approximation in a gap by means of differential algebraic equations, which takes into account two-dimensionality of the lubrication flow in bearings of various configuration and gives results close to actual ones. With the assumptions made in order to simplify calculations, flow line d...

The research analyses and evaluates changes of dendrometric indices of Scots pine (Pinus sylvestris L.) young growths over years, characterizes the impact of various factors on growth course. The investigation includes data of 84 sample plots arranged in western, central and eastern regions of Latvia. The established sample plots comprise forest compartments in Vacciniosa, Myrtillosa, Hylocomiosa, Vacciniosa mel. and Myrtillosa mel. site types. The data obtained in sample plots were collected in period between 201...

Romanian forest and vinicultural ecosystems were strongly affected by climatic changes, especially during the last two decades. The main changes manifested in the health state of these ecosystems were analysed based on data from national monitoring, forest management plans, as well as from national forest statistics (in the case of forests). Furthermore, harmful insects were inventoried and captured with adhesive yellow traps and analysed together with moths captured with traps containing Atrabot synthetical sexua...

Poland?s forest cover accounts for 28.8% and is lower than the average for Europe, which is 32%. The first programme to increase the afforestation rate in Poland was developed in the year 1993 and was titled "The National Programme of Increasing Forest Cover". The document was a strategic study intended for use as an instrument of forest policy in the field of shaping the environmental space of the country. It contains general guidelines for drawing up regional spatial development plans in the scope of increasing ...

The structure of the complex index of viability of CPE is proposed: the complex index of the viability of CPE is a vector whose components are partial indexes of CPE: the index of the condition of CPE; the index of structural varieties of CPE; the equivalent level of noise in CPE due to the movement of transport on the railway lines; concentration of metal salts in CPE; the level of radiation. It is proposed to investigate CPE with the help of a compartmental analysis, in this case, the degree of controllability a...

The purpose of the researches undertaken finds it origin in the scientific and practical concerns regarding the accumulation of knowledge with regards to the characteristics of the natural frame and of the social-economical particularities as elements which define the structural frame in the waste management and of the possible pressures upon the quality of the environment. The importance of the subject tapped derives from the fact that besides the food, clothing and wood necessities, the natural environment (soil...

The paper suggests a mathematical model, which is to evaluate interaction of a wheeled mover and forest soil. The model is composed by compiling results, which were obtained by independent researchers in the framework of vehicle locomotion theory under off-road conditions and authors` obtained dependencies. In particular, the model includes refined formula for calculating shape of contact area with the ground (formula allows to take into account the deformation modulus effect on contact area shape), for calculatin...

The paper presents a mathematical model designed to calculate the depth of the rut formed by a small-sized skidder on soft soils. The model bases on scientific research in the theory of off-the-road locomotion, completed with the authors? own theoretical developments. The model uses deformation modulus and bearing capacity as integral characteristics of strength and deformability of the soil. Moreover, because the deformation modulus of soft soils has a low value and is comparable to the normal stresses, the model...

The study of intra-annual dynamic of wood formation is one of the most progressive and fast-growing fields in plant sciences. The main anatomical characteristics of tree-ring structure, e.g. number of cells and radial cell size, are closely related to the kinetics of cell production. In this case, the timing of seasonal production is a fundamental aspect of plant development and functioning. To better assess the impact of specific climatic events to the timing and dynamic of growth, a process-based modeling can be...

Phenology is a study of timing of event taking place in nature. In a functional ecosystem phenological phases for mutually dependent are synchronized. In a rapidly changing climate there is a risk of decoupling, that is spring development of interdependent could species proceed at different peace. We are investigating the likely timing of spring phenological phases during the last and upcoming centuries for two tree species common in northern and central Europe: bird cherry (Prunus padus known also as Padus racemo...

The study of issues related to the cost of production of biofuel deals with most modern countries. The cost of fuel is one of the most important indicators in the production of various types of energy. The cost of production of biofuels from wood is affected by many factors. Constant components of the cost of production of fuel chips are the collection, removal and shredding and loading of wood chips into motor vehicles, which are 500 rubles/m3. Transporting and unloading chips in the consumer is a variable compon...

The value of wood is only, if it has good appearance as well as mechanical and physical properties. During tree's life, it is influenced by various factors, the effects of which changes wood properties causing different damage to tree stem. Wood defects are caused by biotic, abiotic and anthropogenic factors. Defects of tree stem arising from non-parasitic origin occur on the stems, branches and roots. In total, 86 pure and mixed stands of Norway spruce were surveyed, but this study includes only 11 young forest s...

In the past decades Romania?s forest habitats suffered from human activity impact, resulting in loss of biodiversity and ecosystems services, thus highlighting the need for improved conservation measures. In 2008 the IUCN initiated a global Red List of ecosystems (Resolution 4.020, IV World Conservation Congress in Barcelona). The IUCN Red List of Ecosystems is planned to be a standard for assessing the status of ecosystems, which is applicable at local, national, regional and global level. In this article highlig...

Annually natural resources are disappearing more and more, particularly it concerned forest resources. Furniture, houses, carpentry and etc. are made from wood. Scientists gradually try to find options for replacing forest resources, produce products from other materials, but forest areas are declining. every year. For conservation and rational forest usage, it is necessary to change needs for certain assortments and harvesting of natural wood in the future, and it will be achieved by forest consumption optimizati...