Dissimilatory Nitrate Reduction to Ammonium in Soil

本文研究了（1）哪些微生物具有将土壤中硝酸盐异化还原为铵（DNRA）的能力以及（2）该反应在土壤中的重要性。首先，我们研究了从稻田和农田土壤中分离的约100株细菌菌株的DNRA活性。我们发现属于芽孢杆菌属、类芽孢杆菌属、肠杆菌属、罗尔斯通氏菌属的细菌具有这种能力。我们还发现葡萄糖或乙醇作为电子给体可以提高催化剂的活性。而添加葡萄糖作为电子供体后，水稻土中的DNRA没有显著增加

We studied about (1) which microorganisms have the ability to dissimilatorily reduce nitrate to ammonium (DNRA) in soil and (2) how important the reaction is in soils. Firstly, we investigated the DNRA activity of about 100 bacterial strains which have been isolated from the paddy and cropland soils. We found that bacteria belonging to the genus, Bacillus, Paenibacillus, Enterobavter, Ralstonia have the ability. We also found that glucose or alcohol as the electron donor increase the activity. However, significant DNRA was not observed in the paddy soil after the addition of glucose as the electron donor