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美国科学60秒 SSS 2012-09-14

时间:2013-02-26 08:43:59

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 Plants can pull carbon dioxide, the planet warming greenhouse gas, out of earth's atmosphere. But these aren't the only living organisms that affect carbon dioxide levels and thus global warming. Nope, I'm not talking about humans. Humble1 sea otters3 can also reduce greenhouse gases, but indirectly4 helping5 Kelp plants. That finding is in the Journal Frontiers in Ecology and the Environment. Researchers used 40 years of data to look at the effect of sea otter2 populations on Kelp. Depending on the plant density6, one square meter of Kelp forest can absorb anywhere from tens to hundreds of grams of carbon per year. But when sea otters are around, kelp density is high and plants can suck more than twelve times as much carbon. That's because otters nosh on kelp-eating sea urchins7. In the mammal's presence, the urchins hide away and feed on kelp detritus8 rather than living carbon absorbing plants. So climate researchers need to note that the herbivores plants and predators9 that eat them also have roles to play in the carbon cycle. 


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1 humble ddjzU     
adj.谦卑的,恭顺的;地位低下的;v.降低,贬低
参考例句:
  • In my humble opinion,he will win the election.依我拙见,他将在选举中获胜。
  • Defeat and failure make people humble.挫折与失败会使人谦卑。
2 otter 7vgyH     
n.水獭
参考例句:
  • The economists say the competition otter to the brink of extinction.经济学家们说,竞争把海獭推到了灭绝的边缘。
  • She collared my black wool coat with otter pelts.她把我的黑呢上衣镶上了水獭领。
3 otters c7b1b011f1aba54879393a220705a840     
n.(水)獭( otter的名词复数 );獭皮
参考例句:
  • An attempt is being made to entice otters back to the river. 人们正试图把水獭引诱回河里去。 来自《简明英汉词典》
  • Otters are believed to have been on Earth for 90 million years. 水獭被认为存活在地球上已经9千多万年。 来自互联网
4 indirectly a8UxR     
adv.间接地,不直接了当地
参考例句:
  • I heard the news indirectly.这消息我是间接听来的。
  • They were approached indirectly through an intermediary.通过一位中间人,他们进行了间接接触。
5 helping 2rGzDc     
n.食物的一份&adj.帮助人的,辅助的
参考例句:
  • The poor children regularly pony up for a second helping of my hamburger. 那些可怜的孩子们总是要求我把我的汉堡包再给他们一份。
  • By doing this, they may at times be helping to restore competition. 这样一来, 他在某些时候,有助于竞争的加强。
6 density rOdzZ     
n.密集,密度,浓度
参考例句:
  • The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
  • The region has a very high population density.该地区的人口密度很高。
7 urchins d5a7ff1b13569cf85a979bfc58c50045     
n.顽童( urchin的名词复数 );淘气鬼;猬;海胆
参考例句:
  • Some dozen barefooted urchins ganged in from the riverside. 几十个赤足的顽童从河边成群结队而来。 来自《简明英汉词典》
  • People said that he had jaundice and urchins nicknamed him "Yellow Fellow." 别人说他是黄胆病,孩子们也就叫他“黄胖”了。 来自汉英文学 - 中国现代小说
8 detritus J9dyA     
n.碎石
参考例句:
  • Detritus usually consists of gravel, sand and clay.岩屑通常是由砂砾,沙和粘土组成的。
  • A channel is no sooner cut than it chokes in its own detritus.一个河道刚被切割了不久,很快又被它自己的碎屑物质所充塞。
9 predators 48b965855934a5395e409c1112d94f63     
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面)
参考例句:
  • birds and their earthbound predators 鸟和地面上捕食它们的动物
  • The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》

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