The role of soil heat flux

As a key physical quantity, soil heat flux plays a vital role in many fields such as soil ecosystem, agricultural production, climate and environmental research, and engineering construction. The specific manifestations are as follows:

 

The role of soil ecological environment

Affecting soil heat balance

The size and positive and negative transformation of soil heat flux directly determine the balance of soil heat. A positive value indicates that heat enters the soil layer, and a negative value means that the heat in the soil is released to the atmosphere. For example, in summer, the soil heat flux is positive, a large amount of heat enters the soil, causing the soil temperature to rise; in winter, it is negative, the soil heat is lost, and the temperature drops.

 

Control soil moisture evaporation and respiration

Soil heat flux affects soil temperature, and then affects the evaporation rate of soil moisture. Higher soil heat flux will increase soil temperature and accelerate water evaporation; at the same time, it will also affect the respiration of microorganisms in the soil, because the activity of microorganisms is closely related to soil temperature.

 

Affecting plant root growth and absorption

Appropriate soil heat flux helps to maintain the stability of soil temperature and provide a good growth environment for plant roots. It affects the growth and respiration of plant roots, as well as the absorption of nutrients and water. Different plants have different requirements for soil temperature, and appropriate soil heat flux can meet the needs of plant growth.

 

Role in agricultural production

Regulating soil temperature

Soil heat flux is an important parameter in agricultural meteorological research, which can help people study the functional relationship between energy stored in the soil and time. In agricultural production, soil heat flux can be regulated by reasonable tillage, irrigation and other measures, thereby regulating soil temperature. For example, in early spring, drainage measures are taken in low-lying areas that are prone to water logging, which can warm the soil and facilitate seed germination

Improve land productivity

Studying the effects of different covering and tillage measures on soil temperature and moisture is actually studying how to regulate soil heat flux. By reasonably regulating soil heat flux, the thermal condition of the soil can be improved, which is conducive to the growth and development of crops, thereby improving land productivity.

 

Role in climate and environmental research

Studying the interaction between soil and atmosphere

Accurate measurement of soil heat flux helps to better understand the interaction between soil and atmosphere. Soil heat flux is an important part of the surface energy balance. It affects the energy balance of the earth together with solar radiation, latent heat flux, etc., and is of great significance for studying global climate change.

 

Obtaining soil temperature extemporization distribution data

Research on global climate change, environmental process simulation, element agrochemical cycle, and evolution of soil physical and chemical properties all require complete and accurate soil temperature extemporization distribution data. Heat flux sensors can help detect soil heat distribution and provide data support for these studies.

 

Role in engineering construction

Ground source heat pump system design

In a study in Shanghai, it was found that changes in soil heat flux have an impact on the surface heat exchange of the ground source heat pump system. Through the study of soil heat flux, the ground source heat pump system can be better designed to improve energy utilization efficiency.

 

Building foundation design

Soil heat flux affects the temperature and moisture distribution of the soil, and then affects the mechanical properties of the soil. In the design of building foundations, considering the impact of soil heat flux can ensure the stability and safety of the building.

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