| By artificial simulation dust-fall, with 4 kinds of leafy vegetable as material, the effects of coal dustpollution on the dust-retention quantity and ability, leaf growth and protective enzyme system were studied in thispaper. The results were as follows: with the increase of dust-fall amount, the dust-retention quantity of the wholeplant as well as the unit area of 4 kinds of leafy vegetables increased. The dust-retention ability of Chinese cabbageand lettuce were the strongest, followed by rape, spinach was the weakest. There was little effect of coal dust on theleaf area of rape and spinach, and the leaf area of Chinese cabbage and lettuce behaved promote first and theninhibit under simulated dust-fall. The SOD, POD and CAT activities of 4 kinds of leafy vegetables were inhancedunder dust-fall conditions, and the dust-resistence of Chinese cabbage and rape were stronger than lettuce andspinach. Comprehensive analysis, the stronger the dust-retention ability was, the worse the vegetable commodity was.Thus, its suggested that such leaf vegetable as spinach and rape should be planted in the place where coal dust-fallamount was less than 3.75 g/m2d, and spinach and rape should be planted in the place where the coal dust-fallamount was less than 2.50 g/m2d. |
