Effects of different forest types on soil microbial biomass and enzyme activities in degraded red soil of subtropical region
[Objective]This study aims to analyze the soil quality of different forest types from the perspective of soil microbial biomass and enzyme activity.[Method]Five different forest types,Pinus massoniana,Schima Superba,Liquidambar formosana and P.massoniana×L.formosana,P.massoniana×S.Superb were chosen as the research object.The soil microbial biomass carbon(MBC),nitrogen(MBN),dissolved organic C(DOC),N(DON),NH4+-N,NO3--N,and enzyme activities were measured and the key influencing factors of different forest types were analyzed.[Result]The results showed that:the effects of different forest types on soil pH and water content were significant,the contents of total nitrogen(TN),total phosphorus(TP),DOC,DON and NO3--N in soil of S.Superb were significantly higher than those in P.massoniana.The soil MBC content of Pm×Ss was significantly higher than that of other forest types,and the soil MBN of Pm×Ss was significantly higher than that of L.formosana.The soil sucrase activity of P.massoniana and Pm×Lf was significantly higher than that of L.formosana and Pm×Ss;The soil acid phosphatase(ACP)activity of Pm×Lf was significantly higher than that of P.massoniana,L.formosana and S.superb.The activity of soil acid protease(AcPr)in P.massoniana was significantly higher than that in other forests.Soil total carbon(TC)and TN were significantly positively correlated with soil TP,DOC and DON(P＜0.01).TC and TN was positively correlated with water content,significantly and negatively correlated with acid proteaseAcpr;Soil TP content was positively correlated with DOC,DON and water content,and it was significantly and negatively correlated with AcPr;DOC was positively correlated with DON(P＜0.001),and it was significantly and positively correlated with water content and negatively correlated with AcPr;There was a significant positive correlation between DON,NO3--N and water content(P＜0.01),were negatively correlated with AcPr;MBC and MBN were positively correlated(P＜0.01);There was a significant positive correlation between AcPr and sucrose.In general,among all the factors,MBC and MBN had the greatest effect on soil sucrase and dehydrogenase.[Conclusion]The results indicated that the soil phy-chemical properties of S.superba,L.formosana,P.massoniana(Pm)×S.superb(Ss)and Pm×L.formosana(Lf)were better than that of P.massoniana.
degraded red soilforest typesoil microorganismenzyme activity
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