杉木-木荷混交林对土壤磷形态与解磷微生物组成的影响OA

This study investigated the effects of Cunninghamia lanceolata-Schima superba mixed plantation on soil phosphorus(P)availability.The soil chemical properties,P fractions,enzyme activities,and the structures of phoC-harboring phosphate-solubilizing microbial communities across different soil depths(0-5,5-15,15-30,30-60 cm)of 7-year-old C.lanceolata pure plantation,C.lanceolata-S.superba mixed plantation,and S.superba pure plantation were investigated.The results showed that the content of labile P and moderately labile P in the 0-5 cm and 5-15 cm soil layers of the mixed plantation and pure S.superba plantation were higher than that in the pure C.lanceolata plantation(P<0.05).The difference in acid phosphatase activity among different plantation types was only significant in the 0-5 cm topsoil(P<0.05).Phytase activity in the mixed plantation and pure S.superba plantation was higher than that in the pure C.lanceolata plantation across all soil depths(P<0.05).Furthermore,compared with the pure C.lanceolata plantation,the mixed plantation and pure S.superba plantations exhibited higher alpha diversity of the phoC-harboring phosphate-solubilizing microbial community,primarily in the 5-15 cm and 15-30 cm soil layers(P<0.05).Correlation analysis indicated that soil chemical properties,P fractions,and enzyme activities were closely correlated with the community structure of phosphate-solubilizing microorganisms.The results suggest that the mixed plantation and pure S.superba plantation enhance the metabolic activity of the phosphate-solubilizing microbial community to promote the release of labile P,thus alleviating soil P limitation.