Experiments were carried out using extractants prepared out of deionized water with tea polyphenols(TPs,including tea extracts,catechin and epigallocatechin gallate) and low-molecular-weight organic acids(LMWOAs,including oxalic acid,citrate acid and malic acid) 5 mmol L-1each in concentration,separately,to extract 3 types of acid soil(Albic Fe-accumuli-Stagnic Anthrosols,Typic Haplic-Perudic Argosols and Dystric Purpli-Udic Cambosols) for comparison between the two groups of extractants in effect of mobili...