Phospholipid fatty acid patterns of microbial communities in paddy soil under different fertilizer treatments
ZHANG Qi-chun , WANG Guang-huo , YAO Huang-ying
DOI:
Received January 23, 2006,Revised March 07, 2006, Accepted , Available online
Volume 19,2007,Pages 55-59
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Through microbial cultivation only a minor part of the community can be studied, since the majority of soil microbes are nonculturable. Analyzing the phospholipid fatty acid (PLFA) composition of the soil facilitates to examine the entire microbial community structure, as different subsets of a community have different PLFA patterns. In the current study the composition of soil microbial ecosystem was compared in irrigated rice treated with different fertilizers through PLFA profile technique. The fertilizer treatments included: Control (CK), PK, NP, NK, and NPK. The results of this study revealed that the fertilizer practice had an impact on the community structure of specific microbial groups. Principal components analysis (PCA) showed that proportion of the actinomycetes PLFAs (10 Me 18:0 and 10 Me 16:0) were the lowest in PK treatment, and had the highest values in NPK treatment. It suggested that soil nitrogen status affected the diversity of actinomycetes, whilst nitrogen cycling was related with the actinomycetes. Under CK treatment, the ratio of Gram-positive to Gram-negative bacteria was lower compared with that in fertilizer addition treatments. The results also showed that fungal biomass was at low level in all the fertilizer treatments.
