[Defenition of 137Cs transition quotients to perennial cereal grasses on shellow peat - bed]
2008
Lekunovich, S.N., Institute of Radiology, Brest Brench (Belarus)
On the data of lysimetric research conducted in 2004 – 2006 analysis of influence of ground waters levels to accumulation of 137Cs in perennial feed cereals are carried out. Level range of ground water and volume moisture content of soil providing for minimal accumulation of 137Cs in perennial feed cereals is determined. Transition quotient values of 137Cs to perennial feed cereals on shallow peat-bed are calculated. Experiments fulfilled on lysimeters have allowed to establish a kind of dependence of accumulation of 137Cs in green mass of Bromus Inermis L. on ground waters level and to define the level ranges (60 - 75 cm) at which the minimal transition of radionuclide is observed. At level ground waters deviation both up to 0,3 m and up to 1 m increase of accumulation of 137Cs is studied. Increase of level ground waters leads to the greater accumulation than their reduction. Research on reclaimed soils have confirmed the kind of dependence of accumulation of 137Cs in green mass in perennial feed cereals on a state of levels of ground waters. Approximation of observation data has allowed to receive statistically authentic equation permitting to define the optimal level ranges of the ground waters level at which accumulation of radionuclide in green mass of perennial feed cereals will be the minimal. For shallow peat-bed stretching by sands this range is equal to 60-80 cm, thus volume moisture of root area of soil is equal to 340 – 385 l/m3. It is necessary to note that maintenance of level range of ground water in indicated range does not lead to yield reduction. Values of quotients are important for practical application of received results in forecasting aims
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