4.6 Article

Nutrient availability is a dominant predictor of soil bacterial and fungal community composition after nitrogen addition in subtropical acidic forests

Journal

PLOS ONE
Volume 16, Issue 2, Pages -

Publisher

PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0246263

Keywords

-

Funding

  1. National Natural Science Foundation of China [31670620]
  2. Natural Science Foundation of Fujian Province [2019J05163]

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Nutrient addition, especially nitrogen, has significant impacts on belowground microbial diversity and community structure in subtropical forests. Bacterial alpha-diversity decreased significantly in subsoil with high nitrogen addition. Soil dissolved organic carbon decreased significantly after high nitrogen addition, while available nitrogen declined significantly after low nitrogen addition. Soil dissolved organic carbon was found to be the dominant factor influencing soil bacterial community composition, while available nitrogen and microbial biomass nitrogen were the best predictors of soil fungal community structure dynamics. These results provide evidence of shifts in soil microbial community structure in response to increasing nitrogen deposition in acidic subtropical forests.
Nutrient addition to forest ecosystems significantly influences belowground microbial diversity, community structure, and ecosystem functioning. Nitrogen (N) addition in forests is common in China, especially in the southeast region. However, the influence of N addition on belowground soil microbial community diversity in subtropical forests remains unclear. In May 2018, we randomly selected 12 experimental plots in a Pinus taiwanensis forest within the Daiyun Mountain Nature Reserve, Fujian Province, China, and subjected them to N addition treatments for one year. We investigated the responses of the soil microbial communities and identified the major elements that influenced microbial community composition in the experimental plots. The present study included three N treatments, i.e., the control (CT), low N addition (LN, 40 kg N ha(-1) yr(-1)), and high N addition (HN, 80 kg N ha(-1) yr(-1)), and two depths, 0-10 cm (topsoil) and 10-20 cm (subsoil), which were all sampled in the growing season (May) of 2019. Soil microbial diversity and community composition in the topsoil and subsoil were investigated using high-throughput sequencing of bacterial 16S rDNA genes and fungal internal transcribed spacer sequences. According to our results, 1) soil dissolved organic carbon (DOC) significantly decreased after HN addition, and available nitrogen (AN) significantly declined after LN addition, 2) bacterial alpha-diversity in the subsoil significantly decreased with HN addition, which was affected significantly by the interaction between N addition and soil layer, and 3) soil DOC, rather than pH, was the dominant environmental factor influencing soil bacterial community composition, while AN and MBN were the best predictors of soil fungal community structure dynamics. Moreover, N addition influence both diversity and community composition of soil bacteria more than those of fungi in the subtropical forests. The results of the present study provide further evidence to support shifts in soil microbial community structure in acidic subtropical forests in response to increasing N deposition.

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