奇速英语

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).

Damion Ciotti, a biologist for the U.S. Fish and Wildlife Service who led the project, said he predicted the Doty Ravine project would take ten years to reconnect the stream to the floodplain, but to his surprise, it was restored in just three years. “One important thing that we have to remember is that beavers have been here for a very long time,” said Placer Land Trust land manager Elias Grant, “They understand water flow paths.”

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