Environmental Geochemical Characteristics of Some Microelements in the Black Soil of Jilin province

According to the data collected in the second soil survey of Jilin Province, the environmental geochemical characteristics of total contents in microelement, available contents and their distributions in soil profiles and affecting factors are studied. The main results are as following: (1) B, Mn, Mo and Zn are deficient in total contents in black soil,and Cu and Fe are low. (2)The contents of available B, Cu and Zn are deficient and Zn is severely deficient. (3)The distribution patterns of total contents and available contents of microelements are similar, both having their lowest contents in the celuvium. Compared with the total contents of microelements, the level of illuvium is deeper and the enrichment degree of topsoil is higher. (4)The contents of available B, Cu, Fe, Mn, Mo and Zn have significant positive correlation with the organic matter content in the soil. The contents of available B and Mo have significant positive correlation with pH, while the contents of available Cu, Fe, Mn and Zn have significant negative correlation with pH. The correlation between the contents of B, Cu, Fe, Mn, Mo and Zn and their total contents are proved to be significant. Thus, the trace-element fertilizer should be applied to the cropland in order to increase the contents of microelements in the black soil to promote the sustainable development of regional agriculture.