Soil diazotrophs sustain nitrogen fixation under high nitrogen enrichment <i>via</i> adjustment of community composition.

ABSTRACT: Biological nitrogen (N) fixation, an important pathway of N, inputs from the atmosphere to Earth's ecosystems, is well demonstrated to decline under N input. However, it remains unclear why N fixers sustain N fixation in many forests under high atmospheric N deposition. To address this knowledge gap, we analyzed the response of the diazotroph community to low N loads (short-term and low N addition; 3-year N addition at the rates of 25-50 kg N ha^-1 year^-1) vs high loads (chronic and high N addition; 9-year N addition at the rate of 150 kg N ha^-1 year^-1) in forest soils using high-throughput sequencing. Rates of N fixation decreased under low and high N loads (by 13%-27% and 10%-12%, respectively). Richness and alpha diversity (ACE and Chao1) of th

SUBMITTER: Zheng M 

PROVIDER: S-EPMC11495058 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature