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- Climatology (35)
- Environment (70)
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Abstract: This report deals with the digital modelling of the relief on Shumen’s Plateau. There are many methods for the digital modelling of the relief and the best are those that work in GIS environment. TIN and GRID spatial data models are mostly used. These models can be used to perform spatial analysis and to produce hardcopy and digital maps. A geographic data model represents the real world.
Abstract: The paper discusses the main systems of classification and codification starting from the mainstream to the smallest tributaries and the other way round, from the smallest tributaries to the mainstream systems. A new drainage basin coding system is developed based on the Horton-Strahler principles of classification. The new system is supposed to be useful both for scientific research and the management of water resources.
Abstract: Soil degradation can be described as a process by which one or more of the potential ecological functions of the soil are harmed and also like a process that lowers the current and/or future capacity of the soil to produce goods and services. The arenosols from Dăbuleni Plain, located in the SW of the Romanian Plain, have a large extension due the aeolian sand deposits which covers the Danubian loess terraces. The main degradation processes affecting the arenosols are the removing and deposition of soil material by wind forces. This type of degradation causes loss of topsoil and severe sand accumulation, which reflects in terrain deformation. The loss of topsoil induces a decrease in depth of the A horizon due to the removal of soil material by the wind because of their sandy texture and insufficient protection offered by vegetation. We should also mention that the forest shelter belts are being destroyed. An irregular removal and depositions of soil material by wind action causes deflation hollows, hummocks and dunes which lead to “terrain deformation” with severe consequences concerning land quality.
Abstract: Healthy soil is the basis of high quality food production. Increased awareness toward safe and healthy environment further aggravated the significance of soil quality evaluation and adoption of rational management practices. Evaluation of soil quality is crucial but expensive task for organic growers and smallholder agriculture. Participatory approach in soil quality assessment, thus, can serve the purpose of soil quality assurance for quality production. Physical, chemical and biological soil quality parameters are identified through participatory discussion and they are integrated in a way familiar to farmers. Farmers evaluate their farm soils based on their existing knowledge, agro-ecological condition and farming system of the area. This approach bridges farmers’ ideas with scientific facts with minimum financial investment. Initiatives have already been taken in this line, however, strengthening and institutionalization of the process is needed to replicate this practical technique. Preliminary work in Baccheuli, Chitwan, Nepal indicated the approach as practical, easy, cost effective and convincing to farmers. Moreover, this enhanced confidence to farmers of their soil quality and supported for further strengthening of organic and smallholder agriculture in Nepal.
Abstract: The present study aims at rendering the way the geomorphologic features of the eastern and northeastern regions of the Romanian Plain, influenced by the subsidence movements, is reflected in the soil cover. For its achievement, there was used Romania Soil Map, 1:200 000 scale and field mapping, inventorying the soil cover at the level of class, type and, partially, subtype. In the mentioned area located between the Argeş and the Siret, besides the soils (chernozems, phaeozems, reddish preluvosols) the genesis of which is triggered by the bioclimatic conditions characteristic to steppe, forest steppe and nemoral zone, there also develop soils with azonal and intrazonal character. Thus, the presence of large floodplains imposed the noticeable extension of the soils developed on recent fluviatile deposits (alluviosols). At the same time, the altitude and reduced relief intensity impose an increased phreatic level, which is mineralized in many areas and, consequently, certain soils are affected by hydromorphism (Gleysols and gleyic subtypes) and salinization (solonchaks and salinic subtypes, solonetz and alkalic subtypes). Another characteristic of the studied region is linked to the presence of certain soils buried under alluvial and proluvial deposits. The calculation of the topographical-pedogenetic index (Florea, 1997), as a rapport between non-zonal and zonal soils, emphasizes the pregnant influence of the local conditions from the Buzău and the Lower Siret subsidence plains compared to a series of higher plains (Râmnic, Galaţi).
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