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Contribution Poster

Budker INP - 2nd and 3rd floors

SR XRF USED TO STUDY THE CONTENT OF CHEMICAL ELEMENTS IN THE LEAVES OF LONICERA CAERULEA (CAPRIFOLIACEAE), DEPENDING ON THE CHANGE IN SEISMIC ACTIVITY

Speakers

  • Dr. Irina BOYARSKIKH

Primary authors

Co-authors

Content

The active, deep faults of lithosphere are the channels, carrying the flows of substance and energy, that can affect natural environment, to the surface of the planet. The ascending migration of fluids and the emanation of gases in the zones of active, tectonic faults have a prominent effect on the distribution of chemical elements in soil, air, and plants. The impact of the active faults on biota is subjected to temporal variations due to seismic changes. The present work studies the content of chemical elements in the leaves of Lonicera caerulea L. (blue honeysuckle) over the region characterized by a high, seismic activity and the novel tectonic faults related to the central part of the Chuiskii earthquake of 2003. The studies were performed in 2004, 2008-2010 during a gradual decrease in seismic activity in this zone. The total content of micro- and macroelements in soil and their accumulation in vegetable leaves were determined by the method of X-ray fluorescence analysis using synchrotron radiation (SR XRF) at the station of element analysis of the Siberian Center of Synchrotron and Teraherz Radiation, Budker Institute of Nuclear Physics (VEPP-3 storage ring). Fluorescence was excited by monochromatized synchrotron radiation with an energy of 23 and 38 keV, which allowed one to analyze the elements from K to Ba by the K-series, and from Pb by the L-one of the characteristic X-ray radiation. The concentration of an active form of the elements was measured in soil by atom-absorption method. The intensity of the biological absorption of the elements by the leaves of blue honeysuckle was estimated by the coefficient of biogeochemical activity, i.e., the ratio between the element content in the dry substance of plants and the concentration of the active element form in soil. The SR XRF method made is possible to study the relation between 26 elements in vegetable leaves and in soils with high sensitivity (n*10-9 g/g) within a wide concentration range in small samples (10-30 mg). A comparative estimation of the element content in the leaves of L. caerulea subsp. altaica, collected in the zone of the active, tectonic fault in different years, indicated that during the period of high seismic activity (2004) the concentrations of K, Fe, Cu, Ti, V, Zr, and Nb in plants decrease and those of Ca, Ba, Br, and Sr increase. In this case, the relations between the basic elements (biophils) also changed. A reliable, positive connection was established between the gross content of Ca, Sr, and Ti in soil and leaves. The linear relations between the gross content and the content of the active form of biophilic elements Ca, Zn, and Sr in soils were also positive. In 2004, a more intense accumulation of secondary metabolites, i.e., chlorogenic acid and glycoside лютеолина, involved in the regulation of the mineral supply of plants, was recorded in the leaves, collected in the fault zone.