2014.04.26【英译中】Antarctic Forests

maggiewujia (呉 Felson)
【A+研究所】荣誉会员☆网校制霸
路人甲
56 0 0
发表于:2014-04-29 01:36 [只看楼主] [划词开启]

Antarctic Forests


"Dear A Moment of Science, I know that around 250 million years ago the Earth was a lot hotter than it is today. So I’m wondering what that meant, exactly? How did the planet look different than it does today?"


Well, the Earth was different in lots of ways hundreds of millions of years ago. One major difference linked to warmer global temperatures was that Antarctica was not the icy, barren wasteland it is today. In fact, it was covered by forest.


What kind of forest? That’s what scientists are trying to figure out. Fossilized leaf impressions seem to show that mats of leaves once covered the ground. That suggests that the trees were deciduous, meaning that they shed their leaves at the same time. But fossilized wood from the region tells a different story.


Cells in the tree rings show a pattern of growth that’s consistent with evergreen trees, meaning trees that don’t shed their leaves. So the ancient Antarctic forests were probably a mix of evergreen and deciduous trees. Analysis of carbon molecules in the fossil woods shows something similar. And it also suggests that the forests have some similarities to tropical forests today.


Another question is how Antarctic forests dealt with constant daylight half the year and near total darkness the other half. Wouldn’t that mess with their ability to photosynthesize? More research might reveal the answer.


以下是译文:

南极森林

科学时刻节目组,您好,我了解到在2亿5千年前,地球与目前比更热。所以我开始想知道那真正意味着什么?与现今的地球相比,看上去有什么不同吗?
  恩,数百万年前,地球确实有许多不一样。一个显著的不同,与相对较暖的全球温度有关,当时南极不像现在,冰冷,荒芜。实际上,南极是被森林覆盖。
  什么类型的森林呢?那是科学家们正在努力寻找的答案。石化的树叶压痕似乎表明,曾经如毯状的落叶层,覆盖了地面。那表明树木是有落叶性的,也就是它们会掉叶子。但来自该地区的石化灌木揭示了另一个故事。
  从树木年轮中的细胞来看,生长模式与常青树木相一致,即树木不会掉树叶。所以古南极森林很可能是落叶树和常青树的混合体。从石化灌木的碳分子分析显示出同样的东西。同时,表明那些森林灌木与现今的热带雨林有某种程度上的相似。
  另一个问题,南极森林灌木是如何应对半年的持续光照,以及后半年的完全黑暗呢?这是否会搞乱它们的光合作用呢?更多的研究会揭示出答案。
分类: 英语

  • 0

    点赞

  • 收藏

  • 扫一扫分享朋友圈

    二维码

  • 分享

课程推荐

需要先加入社团哦

编辑标签

最多可添加10个标签,不同标签用英文逗号分开

保存

编辑官方标签

最多可添加10个官方标签,不同标签用英文逗号分开

保存
知道了

复制到我的社团