关键词: 模拟酸雨, 玉米, 种子萌发, 幼苗生长

Abstract: Several issues on redundancy of crop plants were discussed in the peper. The author agree with Odum's definition of redundancy:“ more than one species or component capable of performing a given function ”,but considers that the Zhao Faqing's definition of crop growth tediousness,“various exapanded developmental situations of living systems at different levels ( individual,population or community ),resulting in the departure from the biosystems steady-state by which men can benefit the most ”, has deviated from the basic meaning of redundancy and is not thoughtful.It is a partial idea that only care about the man's need but neglect the request of organisms.In some instances,the fundamental reason of the over-compensation of crop for insects is that insect feedings can not only reduce but also increase the redundancy of crop.The redundancy between different parts or organs of plants rises one after another. In order to increase the products in the crop management, the suitable methods should be applied to increase or decrease the redundancy of crop according to the redundant states of the crops. Redundancy is ubiquitous in the biosystem. It also makes biosystem to resist the random disturbation from surrounding environment in an efficient way. As the result, the stability of biosystem at different levels is maintained.

Key words: simulated acid rain, corn (Zea mays), seed germination, seedling growth.