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托福听力练习-科学美国人60秒:大型动物灭亡

2017-03-01 10:25:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：大型动物灭亡

　　科学美国人60秒中英文翻译：大型动物灭亡

　　科学美国人60秒英文文本

　　Big Animal Extinction Impoverishes Soil

　　By about 10,000 years ago, nearly 100 species of large animals had been recently driven to extinction around the globe. This march of megafauna mortality coincides suspiciously with the arrival of another large animal in their vicinity: humans.

　　The die-off in South America included giant ground sloths and armadillo-like animals the size of cars known as glyptodonts. And the deaths seem responsible for the dearth of nutrients in Amazon rainforest soils today. So says a study in the journal Nature Geoscience.

　　Plainly put, these big animals disperse a lot of phosphorous in their feces. Once the big animals are gone, there's no way for the phosphorous to get from one part of the rainforest to another. As a result, the Amazon rainforest even today is struggling to recover from that loss of fertility.

　　Other parts of the world face the same poop paucity predicament, according to the researchers’ model. But the impact outside the Amazon was less severe, for reasons still unknown. What is clear is that the impact of extinction reverberates down through the millennia, a clear signal that we’ve been living in the Anthropocene for a while.

　　中文翻译请点击下一页

本文关键字: 托福听力练习 科学美国人60秒

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