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不同种类的植物在一起共同生长,是自然界的规律。只有在极其恶劣的环境条件下才可能遇到单一的植物羣社。例如在重盐碱土上只有某些盐生植物才能生存,而在终年积水的沼泽地上生长着成片的芦苇。但年复一年,随着环境条件的改善,在它们当中会逐渐出现其他种的植物,单一的植物羣社不断瓦解,最终不可避免地被复杂的植物羣社所代替。 在长期实践过程中,人类早就认识了这种自然规律,并把它应用到农业生产中。远
Different kinds of plants grow together, is the law of nature. A single flora community may only be encountered under extremely harsh environmental conditions. For example, in saline-alkali soil, only certain halophytes survive, and in the year-long marshy area, there are growing reeds. But year after year, with the improvement of environmental conditions, other kinds of plants will gradually appear among them. The single flora and fauna will continue to collapse, eventually being replaced by complex flora and fauna. In the course of long-term practice, mankind has long understood this natural law and applied it to agricultural production. far