Glaciochemical and biogeochemical studies of natural ice in the Amur Region. L.M. KONDRATYEVA
Keywords:
ice, glaciochemistry, biogeochemistry, organic matters, cryomicrobocenoses, accumulation of pollutants.Abstract
Glaciochemical and biogeochemical studies of natural ice in the Amur Region. L.M. KONDRATYEVA
(Institute of Water and Ecological Problems, FEB RAS, Khabarovsk).
The main results of long-term interdisciplinary researches of IWEP FEB RAS staff in the field of glaciochemistry
and biogeochemistry of natural ice in the Amur Region are presented. More than 30 years of research of river ice are connected with the analysis of mechanisms of cryogenic methamorphization, accumulation and transformation of organic substances and ions of heavy metals. During this time, data on the development of phototrophic organisms in the water-ice contact zone, the layerwise distribution of cryomicrobocenoses during ice contamination with organic substances of various structures and genesis were obtained. The bioindicative role of cryomicrobocenosis in the transboundary contamination of ice after the technogenic accident in China (2005) and the catastrophic floods on the Amur River in 2013 is shown. The preconditions for mercury methylation in ice during the accumulation of phytodetritus are established. The features of the long-term characteristics of the ice regime and the stratigraphy of the ice thickness in the Amur River are identified and priority directions in the study of the ecological role of river ice in the migration of toxic substances to the coastal waters of the Far Eastern seas are determined.
