Abstract:

At the South Edge of the Tengger Desert，the sampled sites of mobile sanddune, semi-fixed sanddune and fixed sanddune were selected as the different stages of the reversion process of desertification with the method of substituting time with space, and topsoil mineral elements of the decertified land were studied in reversion process of desertification. The results showed that the content of S, P, Br, Cl, Sc, Nd, La, Ga, Rb and Sn of topsoil increased, the content of Cu, Mn, Zn, Ni, Nb, Cr, Pb, V, Bi, Hf, As, Y, Ce, Th, Sr, Zr, Ti, Mg, Ca, Na and Fe of topsoil reduced first and increased later, and the content of W, Co, Cs, Tl, U and K of topsoil increased first and reduced later while the content of Ba and Si of topsoil reduced in reversion process of desertification. Obviously, with the reversion process of desertification, sand-binding vegetation recovered, soil structure improved and soil fertility increased, and the contents of topsoil mineral elements changed distinctly.