Straw Mulching and Nitrogen Fertilization Affect Diazotroph Communities in Wheat Rhizosphere.

ABSTRACT: Diazotrophs that carry out the biological fixation of atmospheric dinitrogen (N₂) replenish biologically available nitrogen (N) in soil and are influenced by the input of inorganic and organic substrates. To date, little is known about the effects of combined organic substrate addition and N fertilization on the diazotroph community composition and structure in purple soils. We investigated the effects of N fertilization and straw mulching on diazotroph communities by quantifying and sequencing the nifH gene in wheat rhizosphere. The abundance and richness of diazotrophs were greater the higher the fertilization level in the mulched treatments, whereas in the nonmulched treatments (NSMs), richness was lowest with the highest N fertilization level. The abundance and α-dive

SUBMITTER: Chen S 

PROVIDER: S-EPMC8175977 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature