Soil microbial community composition closely associates with specific enzyme activities and soil carbon chemistry in a long-term nitrogen fertilized grassland.

Due to the profound impact of nitrogen (N) input on soil systems, linking the activity and composition of soil microbial communities to soil organic carbon (SOC) is crucial to reveal the microbial-driven mechanisms underlying SOC decomposition by nitrogen fertilization. A long-term nitrogen fertilization experiment with 6 urea fertilizer gradients (0, 2, 4, 8, 16, and 32 g N m-2 yr-1) was conducted on a temperate grassland. The soil basic characteristics, microbial community DNA sequences, five soil enzymes including C, N, and phosphorus cycling, and soil C fractions were measured after 14 years of N addition. N fertilization significantly modified both the bacterial and fungal community composition, with larger variations at higher N levels. N fertilization increased the proportion of copiotrophic bacteria and saprotrophic fungi. Specific enzyme activities standardized by microbial biomass carbon among N fertilizing gradients demonstrated that the potential of labile C acquisition was stable, but the potential of N and P acquisition and recalcitrant C degradation were increased. Recalcitrant soil C fractions including alkyl C and aromatic C significantly differed among N levels, despite the stable SOC concentration. The variations of bacterial phyla and fungal trophic guilds were both associated with specific enzyme activities; meanwhile, fungal phyla were more related to soil C fractions, as the Basidiomycota abundance echoed the proportion of aromatic C at 4-16 g N m-2 yr-1. In conclusion, this study indicates that the changes in microbial community composition by N fertilization can have far-reaching impacts on SOC turnover and nutrient acquisition.

• Publication year

  2019

• Venue

  Science of the Total Environment

• Publication date

  2019-03-01

• Fields of study

  Medicine, Chemistry, Environmental Science

• Identifiers
  DOI 10.1016/j.scitotenv.2018.11.031PMID 30445326
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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