Total solar radiation refers to the amount of direct radiation emitted by the sun onto the horizontal plane in the sum of scattered radiation scattered by air, water vapor, clouds, etc.in MJ / km2. The annual total solar radiation is the annual average of the total solar radiation in a year. Solar radiation is the most important energy source on the surface of the earth. 90% -95% of the total dry matter in the plant is obtained through photosynthesis. It is the driving force of green plants to produce organic matter, and also the moisture and heat status and physical geography Process, meteorological changes in one of the basic factors. The geographical distribution of total solar radiation is usually from low latitudes to high latitudes, but is also subject to changes in weather conditions. China's total annual solar radiation distribution is more than half of the northwest half of the southeastern part of the plateau than the plains. The annual total solar radiation in the northwestern part is 5500-8300 MJ / km2, especially in the Qinghai-Tibet Plateau. The solar radiation in the southeastern part is between 3300-5500 MJ / km2, with the minimum and the minimum in the Sichuan Basin 4,000 megajoules per square kilometer.
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