Abstract: By the indoor culture method, the albic soils amended with lignin as the tested object, we studied the effects of kaolinite or montmorillonite on the humic composition of albic soils by setting six microbial culture sequences of Bacillus subtilis, Aspergillus niger and Streptomyces griseus. The results show that the promotion effect of C(HA)C(FA) of albic soils caused by kaolinite is greater than montmorillonite when A.niger is served as the Ⅰ period cultured strain or B.megaterium is served as the Ⅰ period cultured strain and A.niger is served as the Ⅱ period cultured strain. The montmorillonite is more beneficial to making the HA molecular structure complicated, and the montmorillonite is more beneficial to the increase of the 
C(HA)C(FA) when S.griseus is served as the Ⅰ period cultured strain; under the influence of B.megaterium→S.griseus→A.niger, compared with SiO₂, two kinds of minerals are beneficial to the increase of the C(HA)C(FA); in addition to S.griseus→B.megaterium→A.niger, the kaolinite is more beneficial to the formation of C(Hu) in the other five microbial culture sequences; the montmorillonite is more beneficial to the mineralization of total organic carbon (TOC) of albic soils than kaolinite when the A.niger is served as the Ⅱ period cultured strain; the degree of mineralization of TOC is the weakest in the microbial culture sequence of S.griseus→A.niger→B.megaterium, and the kaolinite is more likely to promote the microbial consumption of C(WSS); the two kinds of minerals do not affect the wC(WSS) in the ulture sequence of \%A.niger→B.megaterium→S.griseus\%, and montmorillonite is more likely to promote the microbial consumption of C(WSS) in other four kinds of culture sequence; compared with SiO₂, the two kinds of minerals can promote the consumption of C(HE) of albic soils.

Key words: albic soils, lignin, microbial culture sequence, humic composition, clay mineral