English
聯系我們
網站地圖
郵箱
舊版回顧



全球大河僅三分之一可自由奔流

文章來源:科技日報 劉海英   發布時間:2019-05-10  【字號:     】  

  《自然》雜志上最新發表的一項研究顯示,世界上較長的246條河流中,目前僅有三分之一還能保持全程自由流動,越來越多的水壩和水庫正在減少健康河流為全人類提供的多種利益。

  這是科學家有史以來第一次對地球上河流自由流動的狀況進行評估。來自世界自然基金會(WWF)等機構的34名研究人員組成的國際團隊,利用衛星圖像和其他數據,對世界范圍內總流程達1200萬公里的河流的連通狀況進行了分析。他們發現,在全世界長度超過1000公里的246條河流中,僅有37%的河流還能不受阻礙地自由流動;在91條長度超過1000公里的入海河流中,只有21條還能保持從源頭到海洋的貫通。這些尚能自由流動的河流主要流經北極圈、亞馬遜和剛果盆地等偏遠地區;而在人口密集地區,只有伊洛瓦底江、薩爾溫江等少數大河還能自由流動。

  研究人員指出,全球河流形成了一個錯綜復雜的網絡,與土地、地下水和大氣有著重要聯系。自由流動的河流對人類和環境都很重要,不僅支撐淡水魚的繁衍,為數億人提供糧食安全保障,還能提供足夠多的沉積物,防止耕地流失,并維系豐富的生物多樣性。擾亂這些河流的連通性,往往會減少甚至消除其帶給人類和自然的各種好處。

  該研究還指出,水壩和水庫是全球河流連通性喪失的主要原因。目前全世界已建成的大型水壩有近6萬座,正在規劃或建造的大壩則超過3700座,這些人為設施讓許多江河無法自由奔流。此外,氣候變化也威脅著全球河流的健康,溫度上升已經影響到河流的流動模式、水質和生物多樣性。

  新研究提供了跟蹤自由流動河流狀況的數據和方法,有助于各國協調戰略,維護或恢復河流連通性。WWF科學家米歇爾·蒂米指出,目前許多國家致力于發展低碳經濟,迫切需要開發可再生能源,水電成為一個重要選擇,但考慮到河流及人類的可持續發展,規劃良好的風能和太陽能可能是更好的選擇。




(責任編輯:侯茜)

附件:

專題推薦

相關新聞


© 1996 - 中國科學院 版權所有 京ICP備05002857號  京公網安備110402500047號  聯系我們

地址:北京市三里河路52號 郵編:100864

福利彩票www.flff3.com www.i51.host | www.44165.com | www.218871.com | www.388926.com | www.622866.com | www.830279.com | 297827.com | www.7775.hk | www.024570.com | www.112282.com | www.314533.com | www.629881.com | 030061.com | 327044.com | 众彩www.658960.com | www.io71.com | www.89fd.com | www.2796.net | www.9450.in | www.242826.com | www.603665.com | www.73018.com | 921402.com | www.370884.com | www.823499.com | www.606833.com | www.9649.cn | 028753.com | www.680630.com | www.163266.com | www.up3.com | www.109095.com | www.28371.cc | www.5476.org | www.9613.cm | www.110027.com | www.124030.com | www.050398.com | www.573201.com | www.829528.com | cai90.com | www.ui1.com | www.07pt.com | www.72vw.com | www.64if.com | www.18331.cc | www.063419.com | 794809.com | www.527701.com | www.5648.cm | www.993113.com | www.364744.com | www.93810.com | www.kh40.com | www.14ut.com | www.19145.cc | www.58767.com | www.082424.com | www.89574.com | www.216050.com | www.484565.com | www.691039.com | www.733139.com | www.963193.com | www.968603.com | 博通彩票www.606642.com | 823875.com | www.ae36.com | www.1639.top | www.41576.com | www.243442.com | www.273520.com | www.560177.com | www.898819.com | www.952990.com | www.965401.com | 5077.biz | 234376.com | www.te66.com | www.83vi.com | www.7484.com | www.987644.com | www.790496.com | www.632231.com | www.935286.com | 886491.com | 979623.com | 1179.pw | 589925.com | www.s50.org | www.98ft.com | www.44030.com | www.084745.com | www.182667.com | www.254972.com | www.100841.com | www.031316.com | www.46161.com | www.316005.com | www.015860.com | 604466.com | www.740046.com | www.437235.com | www.515036.com | www.623561.com | 137347.com | www.23hw.com | www.075044.cc | www.345107.com | 790193.com | 121467.com | www.ow92.com | www.337.com | www.48855.com | www.256950.com | www.504309.com | www.683046.com | www.921236.com | www.763195.com | www.580551.com | www.553735.com | www.176721.com | www.293683.com | www.165068.com | www.296669.com | www.062241.com | www.9714.cc | www.52395.com | www.228518.com | www.591130.com | www.661870.com | www.17bd.com | www.093.online | www.49656.cc | www.132288.cc | www.521673.com | www.949810.com | 659330.com | www.bk58.com | www.sr67.com | www.24441.cc | www.51929.com | www.090504.com | www.9241.biz | www.518424.com | www.924950.com | www.975264.com | 803486.com | www.877027.com | 名门彩www.33997x.com | 好彩头www.51331f.com | www.cai6855.com | www.26za.com | www.23ks.cc | www.26ht.com | www.20nf.com | www.7di.cc | www.0ed.com | 博友彩www.698771.com | 226183.com | www.998364.com | 588796.cc | 658002.com | 472724.com | E彩堂www.9818o.cc | 全民乐彩票www.2934g.com | www.ha7.cc | www.0998.net | www.5322.xyz | www.237834.com | www.775681.com | www.593268.com | www.353113.com | www.188829.com | www.018606.com | www.00383.com | www.62qa.com | www.14vq.com | www.cp9923.com | 365134.cc | wz46.cc | 616953.com | www.suncity011.com | 677097.com | 019153.com | www.960576.com | www.752901.com | www.700484.com | www.617422.com | www.588297.com | www.628132.com | www.946205.com | www.728944.com | www.929394.com | www.706510.com | www.503571.com | www.341047.com | www.462815.com | www.238978.com | www.469146.com | www.235285.com | www.211219.com | www.067947.com | www.45230.com | www.2207.com | www.33rd.com | www.cai9400.com | 易彩网www.36166k.com | www.r34.cc | www.18pa.com | www.75at.com | www.77194.com | www.155636.com | www.856940.com | 507897.com | 925286.com | www.967734.com | www.840220.com | www.982410.com | www.831527.com | www.802338.com | www.725776.com | 339076.com | 398980.com | 88683.com | 304258.com | www.tr52.com | www.g29.net | www.32bf.com | www.91ca.com | www.008020.com | www.020433.com | www.71211.com | www.062325.com | www.xp3.com | www.436818.com | www.612669.com | www.863826.com | 891003.com | www.49132.com | www.cp6499.com | www.49353.com | www.313987.com | www.713590.com | www.745586.com | www.833382.com | www.887568.com | 971743.com | 356499.cc | 301418.com | 590.club | 473329.com | www.ik88.com | www.7982.vip | www.028683.com | 763425.com | www.575348.com | www.84nl.com | www.842057.com | www.151805.com | www.2011.cm | www.953438.com | www.027745.com | 186467.com | www.484348.com | www.08jo.com | www.709173.com | www.035040.com | www.cp913.com | www.654935.com | www.8131.top | www.990964.com | www.388997.com | www.4889.biz | www.936492.com | www.033734.com | 763279.com | www.459359.com | www.w82.club | www.788391.com | www.53654.com | 博盈彩票www.183380.com | www.590391.com | www.353.cm | www.788379.com | www.936561.com | www.746796.com | www.xy51.com | www.798533.com | www.44723.com | 017910.com | www.143569.com | www.so53.com | www.716654.com | www.355641.com | www.44753.com | www.445644.com | lg84.com | 97738.cc | 64ag.com | 697725.com | 聚彩网www.820335.com | www.su10.com | www.28hv.com | www.024451.com | www.129670.com | www.547616.com | www.542598.com | 717969.com | 358375.com | 159716.com | www.701225.com | www.fs60.com | www.13908.cc | www.1083.wang | 605517.com | www.781377.com | www.440360.com | www.127838.com | www.pl78.com | www.fk49.com | www.839016.com | www.050312.com | 299140.com | www.925496.com | www.916208.com | www.953254.com | www.891193.com | www.994232.com | www.939654.com | www.857477.com | 99018.cc | www.996832.com | www.962507.com | 555512.com | www.989266.com | 138383.com | www.499141.com | dc54.com | 237454.com | 212445.com | www.748398.com | 308840.com | 345388.cc | 997045.com | 051307.com | 彩票驿站www.2350t.com | www.cp717.cc | 网易彩票www.07163h.com | 凤凰VIIIwww.fhfh8.com | 爱彩www.235953.com | 中国福利彩票www.33588g.com | 500彩票网www.61655c.com | 288435.com | 718256.com | 244436.com | 135888.com | cp450.cc | www.pe51.com | www.3ev.com | www.38qs.com | www.19nw.com | www.wr00.com | www.oa44.com | www.hv14.com | www.ph14.com | www.pa35.com | www.b89.org | www.10tk.cc |