Effects of five plantations on soil properties in subtropical red soil hilly region

【Objective】The purpose of this stud was to study effects of 5plantations on soil properties in subtropical red soil hilly region.【Method】Taking five plantations lands(Cunninghamia lanceolata(CL),C.lanceolata-Pinus massoniana(CLPM),C.lanceolata-C.camphora(CLCC),natural secondary forest(NF)and P.massoniana(PM))in subtropical red soil hilly region as test objects,soil samples from depths of 0-20,20-40and 40-60cm were collected to study the effects of plantations on soil physiochemical properties,enzyme activities and microbial properties through the combination of sample investigation and experimental analysis.【Results】(1)Contents of soil organic C(SOC),total N(TN),available N(AN),total P(TP),total K(TK)and available K(AK)in soil of NF were the highest,followed by CLCC, while those of CLPM,CL and PM were very low.Contents of SOC,TN,AN,TP,TK and AK at soil layer of 0-20cm were higher than those at the soil layers of 20-40and 40-60cm(P0.05).(2)Urease(URE),invertase(INV)and polyphenol oxidase(PPO)activities of NF were the highest followed CLPM and CLCC,while those of CL and PM were the lowest.URE,INV and PPO activities at the soil layer of 0-20 cm were higher than those at the soil layer of 20-40and 40-60cm(P0.05).(3)Microbial biomass carbon(MBC),microbial biomass nitrogen(MBN),soil basal respiration(SBR),soil organic carbon(SOC),ratio of soil microbial carbon to organic carbon(MBC/SOC)and microbial efficiency in NF and CLCC were higher than other plantations.【Conclusion】CLCC significantly improved soil properties compared to CL, PM and CLPM and was ideal for this area.