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据美国研究人员介绍，出现温带林多样性的原因部分归于一种土地真菌，这种真菌能杀死同一树种近旁的幼树。印第安纳大学的两位专家发现，群聚在老黑樱桃树根上的pythium真菌能够杀死这株老树周围大约十五米范围内的幼树。其他树种的幼树则安然无恙。专家说他们早就盼望着类似的
According to US researchers, the reason for the diversity of temperate forests is partly due to a type of fungal soil that kills saplings in the immediate vicinity of the same species. Two experts at Indiana University found that the pythium fungus that colonized the roots of old black cherry trees killed young trees about fifteen meters around the tree. The saplings of other species are safe and sound. Experts say they have long looked forward to similar