JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2018, Vol. 42 ›› Issue (02): 59-66.doi: 10.3969/j.issn.1000-2006.201706044

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Effects of fertilizer type on soil microbes amounts and distributions in fertilizer microsites of fluvo-aquic soil

PENG Sili1, ZHU Jin2   

  1. 1. Co-Innovation Center for the Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; 2. Agricultural Products Quality Safety Supervision and Testing Center, Chongqing 404020, China
  • Online:2018-04-12 Published:2018-04-12

Abstract: 【Objectives】Microbes are functional components in soils, and play a critical role in soil organic matter decomposition and nutrient transformation. To understand the impacts of fertilizer type on soil nutrient retention and supply, soil microbe amounts and distributions in fertilizer microsites were studied. 【Methods】Fluvo-aquic soils of under 20 a with no fertilization(CK)and combined manure and mineral fertilization(MNPK)were collected for soil column incubation from the experimental farm at the Henan Academy of Agricultural Sciences, Zhengzhou, China. Three fertilizers, namely chemical fertilizer(CF), 70% chemical fertilizer + 30% organic manure(CFOM), and single organic fertilizer(OM)were packed with nylon mesh and placed in the middle of the soil column. Soil microbe amounts and distributions in the fertilizer microsites(< 5.0 cm)were measured. 【Results】Compared to no fertilizer(NF), the amount of bacteria in CF fertilizer microsites increased by 84% in the CK-treated soil, but no significant difference was observed in the MNPK-treated soil. In both CK- and MNPK-treated soils, the amounts of fungus in CF fertilizer microsites were not significantly different than those in NF, while the amounts of actinomycetes in CF fertilizer microsites were significantly decreased 33% and 36% compared to those in NF. The amounts of bacteria and fungus in fertilizer microsites of OM and CFOM were significantly higher than those in NF and CF, and showed an apparent spatial heterogeneity. The amounts of bacteria were the highest in the 0.5 cm and 1.0 cm profiles of the fertilizer microsites, while the amounts of fungus were the highest in the 1.0 cm and 2.0 cm profiles. The amounts of actinomycetes in fertilizer microsites of OM and CFOM were also higher than those in NF(P<0.05), and increases in the amounts of actinomycetes was accompanied by a significant increases in the amounts of fungus. 【Conclusions】The dramatic increases of microbe amounts in the CFOM and OM fertilizer microsites inferred that nutrients were fixed by microbes, and subsequently were conducive to soil nutrient intention and continuous supply.

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