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@ Renke
2025-05-28 07:50:06Soil moisture is a key factor that affects the structure and function of soil microbial communities. Here are some of the main aspects of how soil moisture affects microorganisms:
Affecting the Growth and Metabolism of Microorganisms Changes in soil moisture content directly affect the growth and metabolic activities of microorganisms. Under suitable moisture conditions, microorganisms are better able to carry out metabolic activities, thereby promoting the decomposition of soil organic matter and the transformation of nutrients. However, under extremely dry or overly wet conditions, the activity of microorganisms will be inhibited, resulting in a decline in soil functions.
Changing the Structure of Microbial Communities Changes in soil moisture conditions can lead to significant changes in the structure of microbial communities. For example, under drought conditions, the number of drought-tolerant microorganisms may increase to adapt to the water shortage environment. While under wet conditions, aerobic microorganisms may dominate. This change in community structure not only affects the soil's water retention capacity, but also other ecological functions of the soil.
Affecting the Stability of Soil Aggregates Soil aggregates are clumps formed by soil particles through physical, chemical and biological actions, and they have an important impact on the soil's water retention capacity. Soil microorganisms participate in the formation and stability of soil aggregates by secreting substances such as extracellular polymers. Appropriate soil moisture helps maintain the stability of soil aggregates, thereby improving the soil's water retention capacity. However, excessive moisture or drought may lead to the destruction of soil aggregates and reduce the soil's water retention capacity.
Regulating soil moisture dynamics Soil microorganisms can regulate the dynamic balance of soil moisture through their metabolic activities, such as decomposing organic matter and synthesizing exopolysaccharides. For example, some microorganisms can increase the water holding capacity of the soil by secreting exopolysaccharides, while others can release water by decomposing organic matter. These activities help maintain the stability of soil moisture and support plant growth.
Influencing the physical properties of soil Soil moisture can also indirectly affect the living environment of microorganisms by affecting the physical properties of the soil, such as pore structure and texture. Good soil pore structure is conducive to the penetration and storage of water, and also provides a suitable living space for microorganisms. Soil texture is closely related to the stability of aggregates. Sandy soils have poor aggregate stability and weak water retention capacity; while clay soils have good aggregate stability and strong water retention capacity.
In summary, soil moisture has many effects on microorganisms, including affecting the growth and metabolism of microorganisms, changing the structure of microbial communities, affecting the stability of soil aggregates, regulating soil moisture dynamics, and affecting the physical properties of soil. Therefore, maintaining suitable soil moisture conditions is of great significance for protecting the diversity and function of soil microbial communities and improving the water retention capacity of soil.