光能利用率是指植物光合产物中所贮存的能量占照射到地面上日光能量的百分率。一般是以单位土地面积在单位时间内所接受的太阳辐射能,除以同时间内该土地面积上植物增加干重所折合成的热量。我国幅员辽阔,各地辐射资源不大一样。大体上自兰州以西部分年辐射量较强,在627.9kJ/cm2 The rate of light energy utilization refers to the percentage of sunlight stored in the plant photosynthetic product as a percentage of the sunlight energy applied to the ground. It is generally based on the amount of solar radiation energy received by a unit of land per unit of time divided by the amount of heat converted by the increase in dry weight of the plant over that area of ​​land over the same period of time. Our country has a vast territory and radiation resources are not the same everywhere. In the year from west of Lanzhou, the amount of radiation was stronger at 627.9kJ / cm2