首先,对于植物来说。你们可以想到,那些烧焦的地方随着时间的发展都会被新的植物覆盖。而且事实上,因为大火给一些本来难以生长的种类得以发芽,黄石的植物因此变得更具多样性。比如,原来长满树木的地方因为火灾遭到破坏,但现在那里长满了需要开阔而阴凉空间的小型植物。另一个例子是,一些植物的种子只有经受过非常高的温度之后才能够发芽。所以,这些植物会在大火之后开始生长。
Its a similar story with the animals. Not only did their populations recover, but the fire also created new opportunities. For instance, the small plants that replaced trees after the fire created an ideal habitat for certain small animals like rabbits and hares. And when rabbits and hares started thriving, so did some predators that depended on them for food. So, certain food chains actually became stronger after the fire than they were before.
动物的情况也类似。不但动物的数量会逐步回复,而且大火会给动物的生长带来新的机会。比如,那些在火灾之后取代原有树木的小型植物给一些小型动物提供了极佳的栖息地,比如兔子。当兔子的数量开始变多,那么以它们为食的捕食者的数量也会增加。所以,大火过后,相应的食物链会变得比之前更加稳定。
And last, fires like 1988 Yellowstone fire would be a problem for tourism if they happened every year. But they dont. It was a very unusual combination of factors that year, low rainfall, unusually strong winds, accumulation of dry undergrowth that caused fire to be so massive. This combination has not occurred since and Yellowstone has not seen such a fire since 1988. Visitors came back to the park next year and each year after that.
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