Soil redox is the main chemical or biochemical reaction in the soil. The soil reaction between the oxidation state and the reduced state present in the soil.
It is the main chemical reaction or biochemical reaction in the soil. The soil reaction between the oxidation state and the reduced state present in the soil. The soil is a complex redox system, and there are many organic and inorganic oxidized and reduced substances. Generally, free oxygen in the soil air, high-valent metal ions are oxidants, organic matter in the soil and decomposition products under anaerobic conditions and low-valent metals are reducing agents. Soil redox conditions include not only pure chemical reactions, but also largely with the participation of organisms (microorganisms, plant root exudates, etc.). The conditions of soil redox reaction are often changed by seasonal changes and human measures (such as irrigation and drowning of paddy fields). The indicator for measuring the redox reaction status of soil is redox reaction potential (Eh). Under natural conditions in China, it is generally considered that the Eh is reduced to less than 300 mv, and the Eh value of the flooded paddy field can be reduced to a negative value. The soil redox potential is generally between 200 and 700 mv, and the nutrient supply is normal. Some valenceous heavy metal pollutants in the soil have a close relationship with valence change, migration ability and biological toxicity equal to soil redox status. For example, arsenious acid (H3AsO3) in soil is several times more toxic than arsenic acid (H3AsO4). When the soil is in an oxidized state, the arsenic is less harmful, and when the soil is in a reduced state, as the Eh value decreases, the reduction of arsenic acid to arsenic acid in the soil increases the harm of arsenic to the crop.
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