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在自然界中,任何一个物种都不是孤立存在的,总要同其他物种发生这样那样的关系。肉食动物要吃植食动物,植食动物要靠消费植物为生,而营自由生活的动植物体内体外还寄生着许多寄生生物。不同种的植物,彼此也是相互依存的。在一个森林群落中,分布在不同层次上的植物,其相互依存性就十分明显。物种之间的相互关系对于整个生物界的生存和发展是极为重要的,它不仅影响每一个物种的生存,而且还把各个物种连接为复杂的生命之网,决定着群落和生态系统的稳定性。现存的生物世界之所以能够年复一年地保持相当
In nature, any one species does not exist in isolation, and always have such a relationship with other species. Carnivores to eat edible animals, plant-based animals rely on consumer plants for a living, while living free-living plants and animals parasites in vitro and in vivo with many parasites. Different species of plants, each other are also interdependent. In a forest community, the distribution of plants at different levels, the interdependence is very obvious. The interrelationship of species is extremely important for the survival and development of the entire biological world. It not only affects the survival of each species, but also connects various species as a complex web of life, which determines the stability of communities and ecosystems . The existence of the living world has been able to maintain the same year after year