叶片形态解剖结构与树木抗SO_2污染的研究

Correlation Between Resistance of Trees to Air Pollutant SO_2 and Their Leaf Anatomical Characteristics

对45种落叶乔灌木叶片形态解剖结构与树木抗大气SO_2污染之间的关系进行了2年重复研究,结果表明,树木叶片栅栏组织越厚抗性越强;海绵组织越薄抗性越强;栅栏组织与海绵组织的厚度比越大抗性越强;栅栏层数越多抗性越强;海绵组织紧密度越大抗性越强;气孔下陷抗性强。而抗性同叶片总厚度、表皮厚度、气孔数目、气孔大小、气孔面积比率、小叶脉数、表皮毛及蜡质层无关。

The correlation between the resistance of trees to the air pollutant SO_2 and their morphological anatomical characteristics of leaves has been studied for two years. The samples consisted of 45 deciduous trees and shrubs, and 15 morphological anatomical charaetristies of leaves were chosen for measurement. For the mean of each characteristic 30 measures were taken under optic microscope. The data were analysed by means of single factor variance analysis. The conclusion is as follows: the stronger the resistance of trees to SO_2 1)the thicker the palisade tissue of leaves; 2)the thinner the sponge tissue of leaves; 3)the larger the ratio between the thickness of the palisade and the sponge tissue; 4)the more cell layers the palisade and the sponge tissue; 4)the more cell layers the palisade tissue; 5)the tighter the sponge tissue; 6) the deeper the stomate sink. While the pollution resistance is not in close relation with leaf and epidermis thickness, stoma amounts and size, stoma area proportion, tiny vein amounts, epigenous hair and wax.