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

C9999www.988456.vip www.67ma.com | 83442.com | 598026.com | 153603.com | 067972.com | www.ja6.cc | www.g49.bid | www.332.cm | www.35373.cc | www.54268.com | www.79069.com | www.027743.com | www.059167.com | www.071911.com | www.104094.com | www.072056.com | www.128384.com | www.161839.com | www.215888.com | www.233200.com | www.255955.com | 174698.com | 975904.com | 990943.com | 640025.com | www.1cz.com | www.22ws.cc | www.24xg.com | www.tk93.com | www.qm62.com | www.324651.com | www.97bi.com | www.031979.com | www.22444.com | 668554.com | 85849.com | 984664.com | 257289.com | 740540.com | 820488.com | 206678.com | 704386.com | 195503.com | 011060.com | 947472.com | 731051.com | 222623.com | 373757.com | 919023.com | 137292.com | 027934.com | 008318.com | ks6.com--ks6.com | 959854.com | 941785.com | 大赢家彩票平台www.376531.com | www.1177.cm | www.1073.com | www.102.pw | www.23974.com | www.26564.com | www.445625.com | www.3oi.com | www.l49.cc | www.08yz.com | www.258.cm | www.236832.com | www.908704.com | 025172.com | www.25318.com | www.025061.com | www.059189.com | www.450766.com | www.584918.com | www.724852.com | www.776223.com | www.954431.com | www.851083.com | www.pn93.com | www.012252.com | www.395788.com | 932575.com | www.0883.in | 365804.cc | 如意彩票www.565516.com | www.ca87.com | www.53bu.com | www.4dc.com | www.ge5.cc | 亚投彩票www.ya909.com | 68彩票www.68682d.com | www.700793.com | www.29410.com | www.611613.com | www.47dg.com | www.394491.com | 407824.com | 011368.com | www.057498.com | 803586.com | 082407.com | www.rp77.com | www.9fj.com | www.59bx.com | www.229316.com | www.337156.com | www.678245.com | www.901901.cc | www.924963.com | www.75mc.com | www.a13.me | www.028785.com | www.431197.com | www.796624.com | www.220654.com | www.556810.com | www.538355.com | www.639415.com | www.918252.com | 166924.com | 226870.com | 218310.com | www.cp5561.com | 291040.com | 658274.com | www.008540.com | www.228987.com | www.670758.com | www.869182.com | www.67or.com | www.4670.org | www.897257.com | www.763803.com | www.790937.com | www.804453.com | www.922078.com | www.3024.top | www.9237.online | www.004385.com | www.120753.com | JJ彩票www.11260.cc | www.1974.vip | www.146622.com | 710646.com | www.953274.com | www.632652.com | www.321954.com | www.qp9.com | www.ya65.com | www.615592.com | 585097.com | www.595234.com | 13e彩票www.576590.com | www.426660.cc | www.369946.com | www.263852.com | www.821733.com | www.855822.com | www.648604.com | www.169797.com | 568642.com | 586954.com | 500彩票www.50026t.com | www.ou5.com | 大赢家彩票网www.178135.com | www.am0.cc | www.18rf.com | www.981649.com | www.31189.cc | 15253.com | www.882527.com | www.x86.club | www.0667.com | www.770191.com | 833535.com | www.90763.com | www.300063.cc | www.216.tv | www.26923.com | www.71337.cc | www.441595.com | www.791095.com | www.894451.com | 199586.com | www.ap84.com | www.967281.com | www.835691.com | 彩票5www.199207.com | www.69373.com | www.777329.com | 乐彩网www.lcw997.com | 131757.com | www.0551.space | www.165082.com | www.841923.com | www.913203.com | www.vp57.com | www.28495.com | www.168333888.com | www.954745.com | www.790229.com | 033609.com | www.085408.com | 18bc.cc | 508085.com | 949378.com | 998828.cc | www.985589.com | 973249.com | hq93.com | 大赢家彩票网www.178167.com | www.374959.com | 353634.com | www.cp8318.com | www.0321.in | www.918601.com | www.878697.cc | www.875674.com | www.358758.com | 9286.biz | 全民汇彩票www.52303w.com | www.230045.com | www.vf12.com | 大赢家彩票平台www.082707.com | www.3847.xyz | www.686533.com | www.247757.com | www.535382.com | www.369333.com | 025683.com | 190632.com | 741147.cc | 472668.com | www.198777.com | www.515694.com | www.904505.com | www.0752.site | www.360046.com | www.444532.com | 439739.com | 091673.com | www.8390.in | www.161771.com | 801914.com | www.68640.com | www.423911.com | 57dv.com | www.3217.xyz | www.750.com | 740228.com | 268599.com | yz04.com | www.29699.cc | www.533766.com | www.338694.com | www.250655.com | www.25km.com | www.585059.com | www.no45.com | www.p38.xyz | www.088015.com | www.666575.com | www.5635.biz | www.33969.cc | www.762938.com | www.12216.cc | www.008298.com | www.228251.com | www.112981.com | www.33162.com | www.691676.com | 54tk.com | www.984193.com | www.895340.com | www.816511.com | 270041.com | www.29917.com | www.08735.com | www.94977.com | www.983033.com | www.id43.com | 974993.com | 933329.com | www.69954.com | 彩之家www.05czj.com | www.250233.com | www.404813.com | www.45663.com | www.104077.com | www.890929.com | www.nq36.com | www.544557.com | www.551237.com | www.782003.com | www.775467.com | www.964513.com | 013414.com | 853.cc | 大赢家彩票网www.178615.com | www.jl11.com | www.5lm.cc | www.480742.com | www.203023.com | www.075631.com | www.3822.xyz | www.jn69.com | 494896.com | 026791.com | www.835006.com | www.554639.com | www.252000.com | www.947140.com | www.834766.com | www.869111.cc | www.509018.com | www.761484.com | www.897404.com | www.848911.com | www.858162.com | www.663965.com | 910793.com | www.777692.com | 705909.com | 彩神帝www.826556.com | www.34mr.com | www.51.vip | www.777776.cc | www.126090.com | 金掌柜www.83993j.com | www.7084.vip | www.5410.vip | www.49922.com | www.66052.cc | www.569607.com | www.255177.com | www.470677.com | www.668464.com | www.758541.com | www.303711.com | www.187869.com | www.168648.com | www.086781.com | www.020637.com | www.532002.com | www.5182.me | www.7494.cm | www.42002.com | www.191085.com | www.15252.cc | 48338.com | www.rp97.com | www.032387.com | 338475.com | 259666.com | www.65963.com | www.189455.com | www.113247.com | www.176196.com | www.120863.com | www.95549.com | www.251.mobi | www.397564.com | www.945766.com | www.268032.com | 576307.com | www.521208.com | www.336793.com | www.311104.com | www.157058.com | www.090555.com | 989415.com | www.46097.com | www.37972.com | www.953447.com | 980743.com | 427077.com | www.524670.com | 网易彩票www.26163z.com | www.022271.com | www.002204.com | www.125767.com | www.s00.cn | www.622538.com | www.wl27.cc | www.gh96.com | www.1322.xyz | www.958504.com | www.96cc.com | www.960365.com | 021733.com | 087230.com | www.wx35.cc | www.472813.com | 928957.com | www.14vn.com | www.982143.com | www.60kd.com | www.13653.com | www.99398.com | www.137790.com | 698945.com | ng04.com | www.957954.com | www.nc32.com | www.60hk.com | www.14um.com | www.578.red | www.79iy.com | www.97ir.com | www.130946.com | www.025597.com | www.137429.com | www.487677.com | www.607108.com | www.766938.com | www.698313.com | www.591946.com | www.qo8.cc | www.zw21.com | www.876574.com | www.62ud.com | 096117.com | www.977084.com | www.540092.com | www.536570.com | www.972104.com | www.29123.com | www.154548.com | www.00wz.com | www.1660.vip | www.337225.com | www.rv46.com | 207563.com | www.874146.com | www.807918.com | www.8596.org | 274767.com | www.99934.cc | 613966.com | 809379.com | 692327.com | 074287.com | www.703440.com | www.33kb.cc | www.189481.com | www.2695.top | www.0121.in | www.072210.com | 186548.com | 500万彩票www.5441w.com | 福彩网www.60007v.com | www.8624.com | www.836496.com | www.kw54.com | www.289.online | www.65md.com | www.5196.biz | xz07.com | 235309.com | 496729.com | www.965656.com | www.698728.com | www.473368.com | www.176420.com | www.75275.com | www.710.in | www.gi65.com | www.fh14.com | 386753.com | www.85868.com | www.cc21.cc | www.879073.com | 412562.com | www.498638.com | www.517761.com | www.458612.com | www.410552.com | www.531888.com | www.422996.com | www.365238.cc | www.611091.com | www.586274.com | www.528390.com | www.474550.com | www.442543.com | www.774408.com | www.691666.com | www.610553.com | www.753290.com | www.817749.com | www.760923.com | www.669582.com | www.658455.com | 96hk.cc | 036581.com | www.988224.com | www.9hz.cc | www.fv03.com | www.1505.pw | www.981.in | www.84jy.com | www.z24.bid | www.ak91.com | www.233224.com | 801757.com | www.589390.com | www.1849.club | www.085078.com | www.k14.com | 892273.com | www.329573.com | www.289012.com | www.916552.com | www.45nj.com | www.2472.cc | www.491177.com | www.485234.com | www.454567.com | www.363576.com | www.17yp.com | 456881.com | 红鹰彩票www.hy6937.com |