Saralov A I, Dziuban A N, Krylova I N
Mikrobiologiia. 1980 Sep-Oct;49(5):813-20.
The rate of molecular nitrogen fixation was determined in bottom grounds of three Estonian lakes and the Rybinsk water reservoir in the summer of 1977--1978. Certain species of nitrogen fixing bacteria were found to be confined to lakes of certain trophic type. Ecological niches with the mass growth of Clostridium pasteurianum, Azomonas agilis and Clostridium butyricum were detected in the sediments of eutrophic lakes. Ecological niches of Az. insignis and Cl. acetobutylicum occur in polyhumic lakes. Ecological niches for the nitrogen fixing microaerophilic organisms Methylosinus trichosporium, M. sporium and Mycobacterium flavum can be found in the sediments of water reservoirs of any trophic type. The important ecological factors which favour the growth of microflora with a high rate of molecular nitrogen fixation in bottom grounds are as follows: a sufficiently high temperature, a weakly alkaline reaction, the presence of oxygen in the water near the bottom, and the ratio of organic carbon to total nitrogen about 10--11. The destruction of organic substances in such sediments involves both aerobic and anaerobic microflora, and Cl. butyricum is abundant among nitrogen fixing microorganisms.
1977年至1978年夏季，对爱沙尼亚三个湖泊及雷宾斯克水库的湖底区域进行了分子态氮固定速率的测定。发现某些固氮细菌种类局限于特定营养类型的湖泊。在富营养湖泊的沉积物中检测到了巴氏梭菌、敏捷固氮菌和丁酸梭菌大量生长的生态位。微嗜酸固氮菌和丙酮丁醇梭菌的生态位存在于多腐殖质湖泊中。在任何营养类型水库的沉积物中都能找到固氮微需氧微生物甲基孢囊菌、芽孢甲基孢囊菌和黄色分枝杆菌的生态位。有利于湖底区域具有高分子态氮固定速率的微生物生长的重要生态因素如下：足够高的温度、弱碱性反应、湖底附近水中有氧气以及有机碳与总氮的比例约为10至11。此类沉积物中有机物的分解涉及需氧和厌氧微生物，在固氮微生物中丁酸梭菌数量众多。
