Pyrite-Based Autotrophic Denitrifying Microorganisms Derived from Paddy Soils: Effects of Organic Co-Substrate Addition.

In the B24, B48, B120, B240, and B480 treatments, the concentration of ammonia nitrogen remained below 0.1 ± 0.1 mg L −1 , although an increasing trend was observed.

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The microbial diversity of the pyrite-based autotrophic denitrification system showed a decreasing trend with the increase of the concentration of co-substrate addition, implying that the continuous addition of organic matter might reduce the relative abundances of some microorganisms (such as autotrophic denitrification microorganisms) in soils, which was consistent with the decreasing sulfate production.

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