Vol. xx, No. xx, 2013; Pages: xx-xx
Long-term manure-containing and P-deficiency fertilization induce opposite changes in microbial community in an arable sandy loam soil in North China revealed by fatty acids methyl esters (FAMEs) analysis
Shixue Zhenga, Junli Hub, c, d, Xuefei Jianga, Fengqin Jia, Jiabao Zhangb,
a, Xiangui Linb,c
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China.
Soil samples collected from a long-term (19-year) experimental field with seven treatments were analyzed for fatty acids methyl esters (FAMEs) to determine fertilization regime effects on microbial community structure in sandy loam soils. The amount of FAMEs in bacteria, actinomycetes, and fungi was highest in all the two organic manure (OM)-fertilized treatments (OM and 1/2 OMN – half OM plus half mineral fertilizer), followed by three mineral P-fertilized treatments (NPK, NP and PK) and the non-manured, no-P fertilization (NK) control showed the least amount of FAMEs, with the exception of fungi which demonstrated no significant difference among the five treatments without OM fertilization. Principal component analysis of FAME patterns indicated that NPK was not significantly different from the control with no fertilizer (CK), but both manure-containing treatments and the P-deficiency treatment were significantly different from CK and NPK. Redundancy analysis plots showed that FAME amounts significantly correlated to soil organic C and total N content, while soil available P and total P contents, which were greatly decreased by the NK treatment, also had positive and substantial effects on soil microbial FAMEs. The results demonstrated the importance of P fertilization as well as organic manure in maintaining soil microbial biomass and impacting community structure.
Keywords:Mineral fertilizer; Principal component analysis (PCA); Redundancy analysis (RDA);
Soil organic C; Soil available P.