手机APP下载

您现在的位置: 首页 > 在线广播 > 科学美国人 > 科学美国人地球系列 > 正文

科学美国人60秒:树种多样化能更好地抵御干旱

来源:可可英语 编辑:aimee   可可英语APP下载 |  可可官方微信:ikekenet
  


手机扫描二维码查看全部内容
j+jN3R8%hLRYVl10+

Tmc#KY^6Hb+]4aw=i3

This is Scientific American — 60-Second Science. I'm Christopher Intagliata.
You've probably heard the financial advice that a diversified portfolio is better in turbulent times? Well that same wisdom may hold true for our stocks of trees. Because ecologists say forests with a diversity of trees are better at weathering drought. The reason:
"There's a huge difference and a huge diversity of water transport strategies in trees." William Anderegg is an ecologist at the University of Utah. "It's everything from having deeper roots or shallower roots, to having these pipes that are incredibly well armored to withstand drought or incredibly weak in the face of drought."
Anderegg and his team studied droughts in 40 forests around the world. And the forests with diverse tree populations, with a mix of water-management strategies, did better than forests made up of just one or a few species. Could be a couple reasons for that.

yQ(9Sb15,P!Yo5[

树木多样性.jpg
"One is that there are other forces that are acting on the ecosystem at the same time. Other stressors like insect attack, or other things they're competing for, competing for light and for nutrients, and this is why a more diverse forest is going to be more functional. It'll be more resilient to drought but maybe also have higher carbon uptake rates over the long term."
The second possibility, he says, is that a monoculture of drought-ready trees may look really resilient to drought. "Up until the drought is severe enough that a whole bunch of the trees shut down or even die. And so that really threshold cliff response you would get in a one species forest and you may not get in a diverse forest." The full report is in the journal Nature.
The lesson for land managers, he says, is that forest restoration efforts following wildfires and disease outbreaks might want to focus on planting a diverse portfolio of tree species. So that even if water plummets, tree stocks will, hopefully, remain stable.
Thanks for listening for Scientific American — 60-Second Science. I'm Christopher Intagliata.

OP+Tc6N50XA

|CJu0yD!JD

u_hE]8QJgOtU2m]w*PXH0OlyScHm@A==FJ.OnARg=8c]NV[i,

重点单词   查看全部解释    
response [ri'spɔns]

想一想再看

n. 回答,响应,反应,答复
n. [宗

联想记忆
acting ['æktiŋ]

想一想再看

n. 演戏,行为,假装 adj. 代理的,临时的,供演出

 
resilient [ri'ziliənt]

想一想再看

adj. 适应力强的,有弹力的

 
species ['spi:ʃiz]

想一想再看

n. (单复同)物种,种类

 
cliff [klif]

想一想再看

n. 悬崖,峭壁

 
diverse [dai'və:s]

想一想再看

adj. 不同的,多种多样的

联想记忆
transport [træns'pɔ:t]

想一想再看

n. 运输、运输工具;(常用复数)强烈的情绪(狂喜或狂怒

联想记忆
ecologist [i:'kɔlədʒist]

想一想再看

n. 生态学家

 
ecosystem ['ekəusistəm]

想一想再看

n. 生态系统

 
stable ['steibl]

想一想再看

adj. 稳定的,安定的,可靠的
n. 马厩,

联想记忆

发布评论我来说2句

    最新文章

    可可英语官方微信(微信号:ikekenet)

    每天向大家推送短小精悍的英语学习资料.

    添加方式1.扫描上方可可官方微信二维码。
    添加方式2.搜索微信号ikekenet添加即可。