REE Contents in Topsoil on the Loess Plateau and Effects of REE Applying on Crops

摘要

Eight rare earth elements (REE) in 104 topsoil samples collected from the Loess Plateau has been determined by using of INAA. The regional distribution of REE contents and its effectiveness of REE applying on crops in this area are discussed. The preliminary results showed that the mean concentration of most REE in this area approaches to those of China as a whole; and REE content in main type of soil of the Loess Plateau is as follows: gray cinnamon forest soil, Lou soil (stratified old manured loessal soil) > Heilu soil (dark loessal soil) , loessal soil > sierozem, and similar with the distribution pattern of soil clay contents in the soil which decrease gradually from southeast to northwest. This area may be suitable to apply REE in agriculture production.