Fertilizer types shaped the microbial guilds driving the dissimilatory nitrate reduction to ammonia process in a Ferralic Cambisol

Publication date: Available online 19 November 2019Source: Soil Biology and BiochemistryAuthor(s): Xuesong Luo, Hang Qian, Li Wang, Shun Han, Shilin Wen, Boren Wang, Qiaoyun Huang, Wenli ChenAbstractDissimilatory nitrate reduction to ammonia (DNRA) is one of the three processes of soil nitrate reduction. However, relationships between DNRA microbes and nutrient fertilization are poorly known. We studied the DNRA microbial community in a Ferralic Cambisol containing plots including control without fertilization, swine manure fertilization (M), chemical fertilization (NPK), and chemical/manure combined fertilization (MNPK) treatments. The abundance of DNRA microbes, represented by the nrfA gene abundance, ranged from 2 × 107 to 5.8 × 107 g−1 dry soil and was positively correlated with soil moisture and total phosphorus (TP) and negatively correlated with NH4+ and total potassium (TK). The potential DNRA rate ranged from 0.5 to 1.5 μg N g−1 dry soil h−1. The α-diversity of the DNRA bacteria increased in the M-treated plots, and the dominant DNRA bacterial OTUs were assigned to the phyla Proteobacteria, Verrucomicrobia and Acidobacteria. PCoA and redundancy analysis indicated that the composition of the DNRA bacteria was strongly impacted by the long-term fertilization regimes and was associated with pH, TN, TP and TC followed by moisture, NH4+ and C/NO3−. Interestingly, the composition of the DNRA bacterial community, the properties of the soil (TP, AK ...
Source: Soil Biology and Biochemistry - Category: Biology Source Type: research