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密歇根新闻广播(MP3+文本):小溪透漏出的生态系统的知识

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Streams can tell us a lot about the health of an ecosystem. But some researchers say we can do a better job of paying attention to those streams.
Jay Zarnetske is an Assistant Professor in the Department of Earth and Environmental Sciences at Michigan State University. He’s an author of a paper in the journal Ecology Letters.
"We need to do a better job monitoring streams because most nutrients and pollutants enter our waterways upstream of large rivers, in those headwaters, the smallest streams. So diagnosing problems in large rivers where we typically monitor, and our rules and regulations are imposed, requires actually studying those small streams," he says.
scienst.jpg"Our new methods are illustrating that it’s very informative to periodically travel around the watershed, see what’s going on, grab samples from all those stream sizes from the smallest to the largest," says Zarnetske.
Streams are excellent sensors, according to Zarnetske.
"Because they collect and integrate what’s occurring on the landscape around them. The real challenge for us is deciphering what that signal is that we see in the stream chemistry," he explains.
He compares it to what happens when we get sick. We go to the doctor, and sometimes the doctor will take a blood sample.
"In that blood sample, we see indications of different issues that might be causing us to not feel great, but more importantly, it tells the doctor where to target their next test, and where the problem might be arising in the body," Zarnetske says. "So that’s what we’re seeking to do with some of our new methods ... is say, 'Where can we most effectively address the root cause of these water quality issues?'"
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sample ['sæmpl]
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n. 样品,样本
vt. 采样,取样
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quality ['kwɔliti]
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n. 品质,特质,才能
adj. 高品质的
 
address [ə'dres]
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n. 住址,致词,讲话,谈吐,(处理问题的)技巧
 
challenge ['tʃælindʒ]
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n. 挑战
v. 向 ... 挑战
 
integrate ['intigreit]
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v. 整合,使 ... 成整体
adj. 组合
 
ecosystem ['ekəusistəm]
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n. 生态系统
 
effectively [i'fektivli]
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adv. 事实上,有效地
 
signal ['signl]
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n. 信号,标志
v. (发信号)通知、表示<
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ecology [i:'kɔlədʒi]
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n. 生态学
 
collect [kə'lekt]
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v. 收集,聚集
v. 推论
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