English 中文網(wǎng) 漫畫網(wǎng) 愛新聞iNews 翻譯論壇
    中國網(wǎng)站品牌欄目(頻道)
    當前位置: Language Tips > Normal Speed News VOA常速

    Tree deaths linked to climate change

    [ 2012-09-12 11:17] 來源:中國日報網(wǎng)     字號 [] [] []  
    免費訂閱30天China Daily雙語新聞手機報:移動用戶編輯短信CD至106580009009

    Get Flash Player

    Download

    Hot and dry conditions triggered by climate change are killing the world's trees, according to a new report which examines dozens of scientific articles on the subject.

    Stanford University graduate student William Anderegg has seen this forest die-off firsthand.

    His doctoral thesis documents the impact of drought on trembling aspen, the most common tree in North America.

    “These are complete hillsides of trembling aspens that are dying off," Anderegg says. "And when the main tree in a forest goes, you tend to see a lot of the other species, especially the grasses and the wild flowers, tend to disappear as well. But you lose a lot of those species from those forests.”

    Changing ecology

    With colleagues from Stanford and North Arizona State University, Anderegg co-authored the new report which presents a picture of accelerating worldwide tree deaths that appear to be linked to changes in the global climate.

    Anderegg says these changes, triggered by rising levels of heat-trapping gases in the atmosphere, are stressing the world’s forests.

    “One of the ways that we expect climate change to increasingly play out in forests is through these widespread tree mortality events where you stress the trees enough that you essentially push a whole region of them off the edge and in fact what happens afterwards, after a forest dies from drought is every bit as important and in some sense matters more to humans who rely on forests.”

    Trees provide a range of ecological services. They hold soil in place, help purify water and shelter species. They are valued for timber and tourism. When trees die, the ecology and hydrology of a forest change, which in turn promotes insect infestation and fire.

    This can result in long-term shifts in the area’s dominant species and may even trigger a transition to a different ecosystem, such as grass land.

    Devastating consequence

    Anderegg says the most devastating consequence may be that the changing forests, in turn, will start affecting the global climate.

    “Because forests do a lot to stabilize the climate and to store carbon and when they start to die off, you can actually have forest die-off accelerate climate change," he says. "You get into a vicious cycle.”

    This is especially troubling for Anderegg because trees, which cover 30 percent of the earth’s surface, absorb 25 percent of the climate-changing gases emitted into the atmosphere from cars, buildings and factories.

    Forest monitoring

    While scientists are getting better at tracking the effects of climate change on forests, data is still sparse. Anderegg says his study urges governments and specialists from many disciplines to support wide-scale forest monitoring.

    “It is not just ecologists, but we also need people working with satellites. We need people in government agencies. We need people on the ground to do this as well. It’s unfortunately not something that just the scientific research community can pull off on their own.”

    Anderegg, whose research is published in Nature Climate Change, says a better understanding of how climate change is killing off the world’s forests can help shape better forest management, business decisions and policies.

    相關閱讀

    To avoid humans, tigers take night shift

    Sea life color codes food to evade danger

    Worries about rising food prices may ease

    'Silent Spring' turns fifty(視頻)

    (來源:VOA 編輯:Julie)

     
    中國日報網(wǎng)英語點津版權說明:凡注明來源為“中國日報網(wǎng)英語點津:XXX(署名)”的原創(chuàng)作品,除與中國日報網(wǎng)簽署英語點津內(nèi)容授權協(xié)議的網(wǎng)站外,其他任何網(wǎng)站或單位未經(jīng)允許不得非法盜鏈、轉載和使用,違者必究。如需使用,請與010-84883631聯(lián)系;凡本網(wǎng)注明“來源:XXX(非英語點津)”的作品,均轉載自其它媒體,目的在于傳播更多信息,其他媒體如需轉載,請與稿件來源方聯(lián)系,如產(chǎn)生任何問題與本網(wǎng)無關;本網(wǎng)所發(fā)布的歌曲、電影片段,版權歸原作者所有,僅供學習與研究,如果侵權,請?zhí)峁┌鏅嘧C明,以便盡快刪除。
     

    關注和訂閱

    人氣排行

    翻譯服務

    中國日報網(wǎng)翻譯工作室

    我們提供:媒體、文化、財經(jīng)法律等專業(yè)領域的中英互譯服務
    電話:010-84883468
    郵件:translate@chinadaily.com.cn
     
     
    无码人妻精品一区二| 最近2019中文字幕大全第二页| 欧美 亚洲 有码中文字幕| 国产丝袜无码一区二区三区视频 | 中文字幕一二区| 国产∨亚洲V天堂无码久久久| 最近最新高清免费中文字幕| 无码人妻精品一区二区三区99不卡 | 忘忧草在线社区WWW中国中文| 亚洲av无码专区国产乱码在线观看 | 最近免费字幕中文大全视频| 免费 无码 国产在线观看观| 亚洲AV无码一区二区二三区入口| 久久中文娱乐网| 一本色道无码道在线| AV无码免费永久在线观看| 亚洲AV日韩AV永久无码久久 | 在线中文字幕视频| 亚洲精品无码99在线观看| 国产亚洲3p无码一区二区| 亚洲热妇无码AV在线播放| 无码国产精品一区二区免费虚拟VR| 中文一国产一无码一日韩| 日韩免费a级毛片无码a∨| 国精品无码A区一区二区| 精品三级AV无码一区| 亚洲AV永久无码区成人网站| 久久无码中文字幕东京热| 亚洲欧美中文日韩V在线观看| 中文字幕精品一区二区日本| 久久久久久久人妻无码中文字幕爆| 亚洲AV中文无码乱人伦在线视色| 18禁黄无码高潮喷水乱伦| 国产V亚洲V天堂无码| 97免费人妻无码视频| 国产爆乳无码视频在线观看 | 无码国产精品一区二区免费vr | 四虎影视无码永久免费| 中文字幕在线免费| 中文字幕精品一区二区三区视频| 中文字幕一区二区三区永久|