Straw return facilitates the immobilization of soil nitrogen by altering the metabolic distribution and nitrogen cycling processes

Soil N: Soil inorganic nitrogen and organic nitrogen components;Metabolome: Assembled metabolomics data for analysis, including pos and neg;Unigenes.absolute.g and Unigenes.absolute.p: Absolute abundance of microorganisms at the phylum and genus levels for analysis;Unigenes.absolute.ko and module: The absolute abundance of KO and MO levels assembled using the KEGG database represents gene abundance and metabolic pathway abundance.