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目的探讨甲醛空气污染对桂花叶片分形特征的影响以及分形理论在甲醛空气污染监测中的应用。方法以矮化盆栽桂花为实验材料,采用0.001、0.005、0.025、0.125、0.625mg/m3的甲醛以薰气法对其进行染毒,新生叶片成熟后,采集叶片制作成叶脉标本,应用分形理论并借助计算机系统测量其分形维数,分析各染毒组叶脉的分形特征变异程度及剂量-反应关系。结果各桂花叶片分形维数对应的相关系数均大于0.9970(P<0.0001);阴性对照组及各染毒组组内比较,桂花叶片的分形维数值组内差异无统计学意义(P>0.05);各染毒组与阴性对照组比较及各染毒组间相互比较,桂花叶片的分形维数值差异有统计学意义(P<0.0001)。结论桂花叶片具有典型的分形特征,甲醛空气污染可导致其分形特征的改变,其变异程度与染毒浓度之间呈正相关并有明显的剂量-反应关系,可以根据桂花叶片分形特征的改变对甲醛空气污染进行监测。
Objective To investigate the effect of formaldehyde air pollution on the fractal characteristics of Osmanthus fragrans leaves and the application of fractal theory in formaldehyde air pollution monitoring. Methods With dwarf potted Osmanthus fragrans as test material, the mice were treated with formaldehyde (0.001,0.005,0.025,0.125,0.625mg / m3) by means of fumigation. When the new leaves mature, the leaves were collected and made into vein samples. Fractal theory The fractal dimension was measured by computer system. The variation degree of fractal characteristic and dose-response relationship of each vein were analyzed. Results The correlation coefficient of fractal dimension of each sweet-scented osmanthus flower was greater than 0.9970 (P <0.0001). There was no significant difference in fractal dimension of osmanthus fragrans between the negative control group and each exposure group (P> 0.05) The difference of fractal dimension of Osmanthus fragrans leaves was statistically significant (P <0.0001) compared with negative control group and each exposure group. Conclusion The leaves of Osmanthus fragrans have the typical fractal characteristics. Formaldehyde air pollution can lead to the change of its fractal characteristics. The degree of variation is positively correlated with the exposure concentration and has obvious dose-response relationship. Formaldehyde can be changed according to the fractal characteristics of Osmanthus fragrans leaves. Air pollution monitoring.