What is the concept of 37-degree weather?

Meteorology in China, when the temperature is above 35℃, it can be called "high temperature weather", and if the highest temperature exceeds 35℃ for several days, it can be called "high temperature heat wave" weather, which will make people feel uncomfortable.

The high temperature warning signal is divided into three levels, which are represented by yellow, orange and red respectively. Among them, the standard of high temperature yellow warning signal is: the daily maximum temperature is above 35℃ for three consecutive days; The standard of high temperature orange warning signal is: the maximum temperature rises above 37℃ within 24 hours; The standard of high temperature red warning signal is that the maximum temperature rises above 40℃ within 24 hours.

Temperature is a physical quantity that indicates the degree of heat and cold of an object, and it is the intensity of molecular thermal motion of the object at the microscopic level. Temperature can only be measured indirectly through some characteristics of an object that changes with temperature. The scale used to measure the temperature value of an object is called a temperature scale.

Influence of wind:

Wind is one of the environmental factors of agricultural production. Moderate wind speed plays an important role in improving farmland environmental conditions. The increase of wind speed accelerates or strengthens the surface heat exchange, evapotranspiration of farmland and the transportation of carbon dioxide and oxygen in the air. Wind can spread plant pollen and seeds and help plants pollinate and reproduce.

Wind energy is widely distributed and inexhaustible. Monsoon prevails in China, which is beneficial to the growth of crops. Inner Mongolia Plateau, Northeast Plain, Southeast Coast and Inland Mountainous Area are rich in wind energy resources, which can be used as energy sources. Wind will also have a negative impact on agriculture. It can spread pathogens and plant diseases.

High-altitude wind is a meteorological condition for the long-distance migration of pests such as armyworm, rice planthopper, rice leaf roller and locust. Strong wind causes mechanical wear of leaves, lodging of crops, broken trees, falling flowers and fruits, which affects the yield. Strong winds can also lead to soil erosion and sand dune movement, and destroy farmland. Blindly reclaiming wasteland in arid areas, wind will lead to land desertification.

Strong winds and snowstorms in pastoral areas will disperse herds and aggravate freezing damage. Some special properties of local winds often cause wind disasters. Tidal wind with high salinity, scorching wind with high temperature and low temperature, and dry-hot wind blowing from the sea have seriously affected the flowering and fruiting of fruit trees and the filling of cereal crops.

In order to prevent wind damage, wind-resistant varieties with dwarfing, lodging resistance and friction resistance are usually cultivated. It is more effective to build windbreaks and set up windbreaks.

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