Distribution and forms of some trace elements in delluvial typical soils from Republic of Moldova
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LEAH, Tamara. Distribution and forms of some trace elements in delluvial typical soils from Republic of Moldova. In: Ecological and environmental chemistry : - 2017, Ed. 6, 2-3 martie 2017, Chișinău. Chisinau, Republic of Moldova: Academy of Sciences of Moldova, 2017, Ediția 6, pp. 109-110.
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Ecological and environmental chemistry
Ediția 6, 2017
Conferința "Ecological and environmental chemistry 2017"
6, Chișinău, Moldova, 2-3 martie 2017

Distribution and forms of some trace elements in delluvial typical soils from Republic of Moldova


Pag. 109-110

Leah Tamara
 
Institute of Soil Science, Agrochemistry and Soil Protection” Nicolae Dimo”
 
Disponibil în IBN: 12 martie 2019


Rezumat

Delluvial typical soils covered the soils formed as a result of the recent accumulation of pedolith deposits (soil material with diverse texture and humification degree) as a result of the intensification of erosion on the slopes. Soils taken in research were formed by the slowly accumulation of pedolith from slopes with chernozem carbonate (calcareous). At the base of catena (slope) were formed delluvial (cumulative) soils with extremely deep humus profiles, which can be separated at the zonal types of soils. The thickness humus profile of the delluvial typical soil is depending on the intensity of accumulation of pedolith and range from 130 cm to 280 cm. Investigated soils are formed on cumulative izohumic soils that buried to a depth greater than 55-70 cm from the surface horizons, and have a genetic differentiation of horizons. The content of humus on profile of these soils decreases unevenly, from 3.4% in the 0-12 cm of soil layer up to 1.2-1.4% in underlying horizons (120-130 and 270-280 cm). An indispensable condition of soil formation as typical cumulative (delluvial) soil is rhythmic accumulation of various trace elements (micronutrients) eroded from slopes at the intensification of erosion process. Mobile and accessible forms of trace elements (Cu, Zn, Mn, Co, Ni) constitute 6-14% of the total content in the accumulative layer, and 4-7% in the profile of buried soil. The greater amount of trace elements is associated with carbonates (25-30%) and hydroxides (36-58%). The Cu content associated with organic matter constitute - 20% of the total content; the content of Zn, Co, Ni, Mn are not absorbed by organic matter in these soils, these content constituting very small amounts of detection. Instead this micronutrient is associated with clay minerals (50-70%) that constitute a potential reserve for plant nutrition. In the eroded carbonate chernozems from slopes prevalent chemical forms of the compounds of carbonates, oxides, primary minerals that are inaccessible to plants. Chernozems carbonate eroded need fertilizing with organic fertilizers that will lead to an increase the organic matter in soils and to the capture nutrients for plants on the slopes.