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一、光谱成分与植物的关系 光是一种电磁波,主要波长范围是200～400nm,其中人眼可见光的波长在390～770nm之间,只有可见光才能在光合作用中被植物所利用并转化为化学能.波长小于390nm的是紫外线,波长大于770nm的是红外线. 太阳光中的紫外线分为三个波段:紫外线A,波长为320～390nm;紫外线B,波长为280～320nm;紫外线C,波长为220～280nm,其中紫外线C和绝大部分紫外线B被大气平流层中的臭氧(O3)吸收.当大气中臭氧层被破坏变薄时,就会让大量的紫外线穿过大气层,辐射到地球表面,对生物圈内的生物造成严重的危害.紫外线的主要作用是化学作用,如果利用紫外线照射植物种子或幼苗,就能诱发基因突变,培育出植物新品
First, the relationship between spectral components and plants Light is an electromagnetic wave, the main wavelength range is 200 ~ 400nm, of which the visible wavelength of the human eye is between 390 ~ 770nm, only visible light can be used by plants in photosynthesis and transformed into chemical Energy wavelengths less than 390nm are ultraviolet rays, and wavelengths greater than 770nm are infrared rays. The ultraviolet rays in the sunlight are divided into three bands: ultraviolet rays A, wavelengths of 320-390nm; ultraviolet rays B, wavelengths of 280-320nm; ultraviolet rays C, wavelengths are From 220 to 280 nm, ultraviolet C and most of ultraviolet B are absorbed by ozone (O3) in the atmospheric stratosphere. When the ozone layer in the atmosphere is destroyed and thinned, a large amount of ultraviolet rays pass through the atmosphere and radiate to the surface of the earth. Causes serious damage to organisms in the biosphere. The main role of ultraviolet light is chemical action. If ultraviolet light is applied to plant seeds or seedlings, gene mutations can be induced and new plant products can be cultivated.