关键词: 稀土, 土壤肥力, 黄褐土

Abstract:

China has the largest reserves and output of rare earths (REs) in the world, and the application of REs in agriculture has been carried out early and has made great progress However, long term use of REs may cause large amount of accumulation of REs in soil and exert negative effect on soil chemical and biological properties In the past few years, many researches have been focused on the effects of exogenous REs on soil fertilizer, the composition of soil solution, soil microbes and enzymes, especially the changes of the availability of macronutrients in soil such as nitrogen, phosphate etc because the use of REs fertilizer has attracted more attention due to their important role in agricultural production and ecological balance In this paper, the contents of soil available N, P, exchangeable and water soluble cations K⁺ , Na⁺ ,Ca²⁺ , Mg ²⁺ as well as soil electric conductivity were determined respectively, and the effects of exogenous rare earths (REs) on the fertility of yellow cinnamon soil were studied through soil culture in both dry and flooding conditions The results showed that the concentrations of the applied REs had significant positive correlation with the contents of soil available N in dry condition, and significant negative correlation with that in flooding condition REs treatments led to the decrease of the contents of soil available P in both dry and flooding conditions There was no significant effects of REs on soil exchangeable cations, but the applications of REs increased electric conductivity and the contents of water soluble cations, especially that of Ca²⁺

Key words: rare earths, soil fertility, yellow cinnamon soil