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二氧化硫是大气主要污染物.植物对SO_2反应十分敏感,通常人和动物还不致引起伤害的污染剂量,却可使一些植物受到伤害.叶片是植物进行气体交换的器官,庞大的叶表面与空气接触使SO_2得以随着空气一起通过气孔进入叶内.所以,SO_2的伤害首先表现在叶片上.余叔文等人的研究指出:“当急性伤害症状出现时,阔叶植物叶片脉间有不规则形坏死斑,斑点大小不一或呈块状”,“受SO_2伤害的叶片有的能发特殊的荧光”,并认为这是一种可以利用的特性.因此,利用植物叶片发光表征SO_2污染日益受到人们的重视.直接利用叶片
Sulfur dioxide is a major pollutant in the atmosphere and plants are very sensitive to SO2 reactions, and generally humans and animals are not yet contaminated with the pollutants that cause injury, but some plants can be harmed. The leaves are organs that allow plants to exchange gases. Large leaf surfaces are exposed to air So that SO_2 can enter the leaf along with the air through the stomata.So SO_2 injury first appears on the leaf.Yu Shuwen et al’s study pointed out: “When the symptoms of acute injury appear, there is irregular necrosis between the leaves of broad-leaved plants Spots, spots of different sizes or lumps, ”“ leaves that are damaged by SO2 can emit special fluorescence, ”and consider this a viable feature, therefore, the use of plant leaf luminescence to characterize SO 2 pollution has been increasingly recognized by people The importance of direct use of leaves