Mercury in plants of the Transbaikalia
2009
Kashin, V.K. | Ivanov, G. M., Russian Academy of Sciences. Siberian Branch, Ulan-Ude (Russian Federation). Institute of General and Experimental Biology
The researches were carried out in steppe and dry steppe which was situated in central and southern parts of Buryatiya, the most densely populated. On typical plots of steppes, meadows and crops were installed the key areolas in the dimension 100 х 100 m. On each areola separate kinds of plants, and also hay cuttings of phytomass from 1 square meter were collected up. Sampling was realized in period of mass blooming of predominant plant species. The specific differences on ability of plants to accumulate mercury were revealed. Differences between maximum (Astragalus dahuricus, 14 mkg/kg of dry mass) and minimum (Medicago falcata, 4 mkg/kg) the mercury content in the same habitat reached 3.5 times. The plants by the same species growing in different ecological conditions also accumulated unequal quantity of mercury. Differences in its content varied from 1.4 to 5.0 times among 15 studied species. The mercury content in natural phytocenosises varied from 3 to 17 mkg/kg, and in cultivated cenosises was from 3 to 130 mkg/kg. The steppe, meadow and cultivated vegetation of steppe landscapes contained mercury within background limit. The mercury content in cultural vegetation of a dry steppe landscapes exceeded background level by 3-13 time. Mercury accumulation in a terraneous biomass per unit of area and its involving in biological migration strengthened among (mg/hectares): a steppe vegetation (3.2) - meadow vegetation (39.6) - cultivated vegetation of a steppe landscape (62.3) – cultivated vegetation landscape (349.0).
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