导读：多亏了大自然的工程师们，加州的一个看起来像野火危险区的洪泛平原恢复了往日的生机。

 

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Seven years ago, ecologists looking to restore (恢复) the Doty Ravine in Lincoln, California, had to choose between spending over $1 million bringing in heavy equipment or trying a more natural way. They went for the second choice, and turned to nature’s original flood manager to do the work—the beaver (河狸).

The creek bed (河床), which was changed by many years of agricultural use, had looked like a wildfire risk. But it came back to life far faster than expected after the beavers went to work. “It was crazy, it was great,” said Lynnette Batt, the conservation director of the Placer Land Trust, which owns and keeps the Doty Ravine Preserve. “It went from dry grassland to totally green one, trees turning up, wetland plants of all types, different stream (溪) channels across about 60 acres of floodplain (洪泛平原).

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