Nitrogen enrichment regulates straw decomposition and its associated microbial community in a double-rice cropping system.

ABSTRACT: Litter bag method was conducted to investigate the decomposition characteristics of rice straw (6000 kg ha-1) and its associated microbial community under different nitrogen (N) addition rates (0, 90, 180 and 270 kg N ha-1) under double-rice rotation. Generally, straw mass reduction and nutrient release of rice straw were faster in early stage of decomposition (0-14 days after decomposition), when easily-utilized carbohydrates and amines were the preferential substrates for involved decomposers. Straw-associated N-acetyl-glucosamidase and L-leucine aminopeptidase activities, which were higher under 180 and 270 kg N ha-1 addition, showed more activities in the early stage of decomposition. Gram-positive bacteria were the quantitatively predominant microorganisms, while fungi and actinomycet

SUBMITTER: Guo T 

PROVIDER: S-EPMC5789828 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature