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Photosynthesis can only be achieved when the plant is in hot conditions. At different stages of its growth, plants and soils will maintain different hydrothermal relationships. This relationship is inseparable from changes in soil temperature and humidity, and the evapotranspiration of vegetation is actually mainly affected by the temperature and humidity of the soil near the surface layer. influences. Therefore, it is believed that changes in vegetation and changes in soil water-heat are interrelated and affect each other. During the process of plant growth, the temperature and humidity of the soil will change significantly due to the different vegetation cover over time. In the same place, due to the difference in local vegetation coverage, or the same daytime and nighttime vegetation coverage, there will be significant differences in soil temperature and humidity.
During the different stages of the growth process of alpine Kobresia plants, the daily changes of soil temperature and humidity were observed, and the vegetation cover, biomass, and leaf area were correlated. The soil temperature and humidity recorder was used to analyze and analyze the soil of dwarf meadow grass. Temperature and humidity responses to changes in vegetation cover.
By measuring the temperature and humidity of the soil in vegetation-covered areas with a soil temperature and humidity recorder, it can be found that the soil temperature gradually increases compared with the non-vegetated area as the seasons are replaced. This shows that the alpine meadow is distributed In the area, the increase in vegetation coverage is beneficial to the increase of soil temperature. In areas where vegetation is scarce or exposed, ground temperature decreases rapidly at night, while covered areas due to the presence of vegetation reduce the long-wave radiation heat dissipation/buffering 0. This / buffering 0 effect is more pronounced when the cover is thicker, so The thickening of the cover is beneficial to the elevation of the ground temperature. Although the evapotranspiration of the vegetation is increased after the cover is thickened, which causes energy loss and cooling, the soil evaporation in the lower part of the crown can be reduced because of the cover, and the heat preservation effect is much larger than the loss of heat.
The growth and development of plants, the decomposition of plant and animal residues, and the activity of soil microorganisms are all directly affected by the temperature and humidity of the soil. Conversely, the plant growth status and vegetation coverage also contribute to a certain extent. The temperature and humidity of the soil. The large-scale land cover and land use are one of the important factors of regional climate change, and the changes in water and heat transmission are even more profound. The soil temperature and humidity conditions can be effectively measured using a soil temperature and humidity recorder.