Injury Characteristics Of Pyrene Pollution In Soil On Different Vegetables

Pyrene has the similiar structure as phenylpyrene, a kind of carcinogen.it's very dangerous and indiscerptible, and exists universally in environment. It can endanger people's health through food chain. Nowadays more and more people pay attention to it. Researching the toxicity and mechanism of pyrene to vegetables is so significative that it can reduce the environmental risk of pyrene and guarantee vegetables'quality safety. This paper using soil culture experiment and water culture experiment, studied pyrene absorbing and accumulating characters of three kinds of Pakchoi (Brassica campestris ssp. Chinensis L. var. communis Tsen et lee), radish (Raphanus sativus L.) and pimiento (Capsicum annuum.)in the polluted soil environment, analyzed the influence of pyrene intimidation on vegetables'growth and physiology and discussed the relationship between the pyrene pollution of soil and self-fastness of vegetables The main results are as follows:1. Soil culture experiment of the three kinds of vegetables showed that, under the condition of pyrene pollution, pyrene concentrations in the three vegetables were significantly correlated to the added pyrene levels in the soil. However, the concentrations of pyrene are dissimilar between the three kinds of vegetables at their different parts: the concentrations of pyrene in the parts of pakchoi and pimiento above ground were lower than that in their roots, however the case of radish was quite different. The comparison of concentrations of pyrene in the aboveground parts of the three kinds of vegetable was: pimiento was the highest, radish was second, then was pakchoi, and the comparison in the roots was: pimiento was the highest, pakchoi was second, and radish was the lowest.2. Pyrene had an obvious repression on the germination and elongation of roots of the three kids of vegetables. Pyrene concentrations were significantly correlated to the repression rate of elongation of the three's roots. The root elongation repression rates of pakchoi and pimiento showed logarithms growth with the increase of pyrene concentration, and that of radish show linear growth with the increase of pyrene concentration. However, the sensitivity of the three vegetables to pyrene was different. Pimiento is the most sensitive. According to their valves, comparison of repression rates of pyrene on roots elongation between the three was as follows: pimiento was the easiest to be...