三江平原白浆土微量元素和稀土元素的地球化学特征

GEOCHEMICAL CHARACTERISTICS OF TRACE ELEMENTS AND RARE EARTH ELEMENTS IN ALBIC SOILS IN THE THREE RIVER PLAIN

Three pedons of typical albic soils in the Three River Plain of Heilongjiang Provence were chosen far the study of elemental geochemistry.The background levels of trace element and rare earth element were established for these undisturbed soils.The redistribution and differentiation of these elements during soil forming process were analyzed.We found that Br,Cl,I and Hg were possibly accumulated in Ah Horizons,due to dust deposition and their affinity for soil organic matter.Mn,As,Sb,Th and U were associated with amounts of oxalate and dithionite extractable Mn and Fe in E horizons.The Cr,Rb,Sc,V and Zn Were closely related to clay particles and enriched in Ba horizons.The B,Ba,Hf,Sr,Ti and Zr exist generally in weathering-resistant minerals and have a relatively even distribution in soil profiles.