Biomass and catabolic diversity of microbial communities with long-term restoration, bare fallow and cropping history in Chinese Mollisols
2007
Wang, G.H.,Chinese Academy of Sciences, Harbin (China). Key Lab. of Black Soil Ecology | Jin, J.,Chinese Academy of Sciences, Harbin (China). Key Lab. of Black Soil Ecology | Chen, X.L.,Chinese Academy of Sciences, Harbin (China). Key Lab. of Black Soil Ecology | Liu, J.D.,Chinese Academy of Sciences, Harbin (China). Key Lab. of Black Soil Ecology | Liu, X.B.,Chinese Academy of Sciences, Harbin (China). Key Lab. of Black Soil Ecology | Herbert, S.J.,University of Massachusetts, Amherst (USA). Dept. of Plant, Soil and Insect Sciences
Microbial biomass and community catabolic diversities at three depths (0-10 cm, 20-30 cm, and 40-50 cm) in Chinese Mollisols as influenced by long-term managements of natural restoration (R), cropping (C) and bare fallow (F) were investigated. Microbial biomass was estimated from chloroform fumigation-extraction and substrate-induced respiration, and catabolic diversity was determined by using Biolog EcoPlate. Microbial biomass significantly declined with soil depth in R and C systems, but not in F, where the microbial biomass had a positive relationship with the total soil C content. R had a relatively stronger metabolic ability than C and F systems. Shannon's diversity index, substrate richness and substrate evenness calculated from the Biolog data were higher in R and C than in F. The catabolic profiles of the three treatments were similar to each other in the soil depth of 0-10 cm and distinctly different in the soil depths of 20-30 cm and 40-50 cm. These results suggest that it was microbial biomass rather than community function that was influenced by the different soil management in the top soil (0-10 cm), whereas in deeper layers, the soil microbial community function was more easily influenced than microbial biomass.
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