TRACE ELEMENT GEOCHEMISTRY OF THE SOIL IN NEHE CITY, HEILONGJIANG PROVINCE

The total and available contents of trace elements such as B, Cu, Mo, Fe, Mn and Zn in the soil of Nehe City, Heilongjiang Province, are analyzed and studied based on the 1:250 000 scale geochemical survey data of the quality of black land in Northeast China. The results indicate that the surface soil is characterized by rich Mn, abundant Fe and Mo, and deficient B, Cu and Zn. In terms of available content in surface soil, Cu, Fe, Mn and Zn are abundant, B medium and Mo deficient. The leaching and deposition degree of trace elements in black soil profile is obvious, which is low in the leaching layer and high in the surface and deposition layer, but not evident in meadow soil. According to the distribution characteristics of total and available trace element contents in soil, the trace element fertilizer should be chosen to promote sustainable development of agriculture.