Denitrification is nitric acid reduction. There are many heterotrophic denitrifying bacteria in the soil. In the case of poor ventilation and lack of oxygen, glucose can be oxidized into carbon dioxide and water by using oxygen in nitric acid to release energy.
The main links of nitrogen cycle are: synthesis, ammoniation, nitrification, denitrification and nitrogen fixation of organic nitrogen in organisms.
Plants absorb ammonium salts and nitrates in soil, and then assimilate these inorganic nitrogen into organic nitrogen such as protein in plants. Animals eat plants directly or indirectly, and assimilate organic nitrogen in plants into organic nitrogen in animals. This process is called the synthesis of organic nitrogen in organisms. Organic nitrogen in animal and plant residues, excreta and litter is decomposed by microorganisms to form ammonia. This process is called ammoniation. Under aerobic conditions, ammonia or ammonium salt in soil is finally oxidized into nitrate under the action of nitrifying bacteria, which is called nitrification. Inorganic nitrogen produced by ammoniation and nitrification can be absorbed and utilized by plants. Under the condition of insufficient oxygen, nitrate in soil is reduced to nitrite by microorganisms such as denitrifying bacteria, and further reduced to molecular nitrogen, which returns to the atmosphere. This process is called denitrification.
Molecular nitrogen in the atmosphere is reduced to ammonia, a process called nitrogen fixation. Without nitrogen fixation, molecular nitrogen in the atmosphere cannot be absorbed and utilized by plants. There are three kinds of nitrogen fixation methods on the earth: biological nitrogen fixation, industrial nitrogen fixation (nitrogen is converted into ammonia through high temperature, high pressure and chemical catalysis) and high-energy nitrogen fixation (such as high energy generated by lightning and other high-altitude instantaneous discharges, which can combine nitrogen in the air with hydrogen in water to generate ammonia and nitric acid, which are carried to the ground by rain). According to scientists' estimation, the total amount of biological nitrogen fixation accounts for about 90% of the total amount of nitrogen fixation on the earth every year. It can be seen that biological nitrogen fixation plays a very important role in the earth's nitrogen cycle.
Why are rhizobia consumers and azotobacters chromophores decomposers?
Why are nitrifying bacteria producers and denitrifying bacteria decomposers?
Rhizobia obtains organic matter from leguminous plants, which of course belongs to consumers, because it obtains organic matter from living organisms.
Chromospheric nitrogen-fixing bacteria, on the other hand, obtain organic matter from soil, which is the decomposer.
Nitrifying bacteria can synthesize organic matter from inorganic matter and belong to producers.
Denitrifying bacteria also need to absorb organic matter from soil to maintain their life activities. So it should be a decomposer.