The appearance of soil degradation in the reception basin “Negrea”
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2021-03-10 14:18
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COJOCARU, Olesea. The appearance of soil degradation in the reception basin “Negrea”. In: Conservation of plant diversity, Ed. 4, 28-30 septembrie 2015, Chișinău. Chișinău: Gradina Botanica (Institut), 2015, Ediția 4, p. 117. ISBN 978-9975-3036-8-2.
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Conservation of plant diversity
Ediția 4, 2015
Simpozionul "Conservation of plant diversity"
4, Chișinău, Moldova, 28-30 septembrie 2015

The appearance of soil degradation in the reception basin “Negrea”


Pag. 117-117

Cojocaru Olesea
 
Institute of Soil Science, Agrochemistry and Soil Protection” Nicolae Dimo”
 
 
Disponibil în IBN: 16 mai 2019


Cuvinte-cheie
degradation, ordinary chernozem, soil losses, reception basin, Republic of Moldova


Teza

In the Republic of Moldova about 80 percent of agricultural land is located on slopes and exposed to erosion or erosion danger. The presence of large areas with poorly eroded soils indicates potential possibility of increased erosion on agricultural lands as a result of their irrational management. Soil degradation processes, including through erosion, are conditioned both the natural factors as well as anthropogenic activity (Cerbari V.V, 1996).  The research aim consists of the prominent influence of the degree of soil erosion on runoff and soil loss from rural area in the village Negrea, the central part of the country. The relief of the basin framework consists of two primary surface heights denudation, with altitude 226 - 227 m, which starts from two elongated ridges ending in the valley of the rivulet Lapusnita. The inclination of relicts of surface denudation is about 10 (Andries al., 2003). Rill erosion comprises 40-50 percent of the surface of demonstration fields. Soil washing from the surface is associated with the laminar course of water down the slope. In this sense, a transfer of soil particles and their resubmission at the bottom of the slope as deluvial deposits takes place. The intensity of soil washing varies on different surfaces (Cerbari V.V, 1996; Nour D., Balteanschi D., 2004). The research was performed on sloppy clay-loam ordinary chernozems in the reception basin “Negrea”, Hincesti district. Reception basin “Negrea” is located in the middle of the hydrographic basin of the rivulet Lapusnita and is typical for the reception basins formed as a result of fragmentation by erosion of high terraces of the Prut River and its left tributaries. High terraces of the tributaries of the Prut River and the Prut River itself were synchronously formed in the Pleistocene and represent a unique relief in terms of genesis and lithology of rock surface, characteristic of the Middle Prut Plain (Andries al., 2003). Mapping the soil cover of the reception basin was performed at the scale 1:5000, after the detailed research. The increase in the volume of liquids that leaks from poorly eroded at the strong eroded is explained by the decrease in hidrostability of structure, increasing degree of compaction and reducing lacunar space (Boaghe Lilea, 2010).  The natural factors which favor soil erosion are: highly fragmented relief, the character of torrential atmospheric precipitation in the warm seasons of the year and low ability of soils to resist erosion (Cerbari V.V, 1996). Erosion in the territory of reception basin “Negrea” became the main factor of unrecoverable destruction of agricultural soil profile and diminished its production capacity. Therefore, on the slopes, lands with inclination less than 1 ° and without risk of erosion of arable soils occupy not less than 20 percent (Constantinov I.S., 1987; Кrupenikov I.А al., 2006). This regularity has also been demonstrated for ordinary chernozems in the south of the republic (Boaghe Lilea, 2010; Constantinov I.S., 1987). According to statistics, the level of silting aquatic basins as a result of soil erosion varies from 11-54 % (Nour D., Balteanschi D., 2004).