智课网IELTS备考资料雅思阅读全球时事瞭望阅读篇：树木死亡和气候摘要：了帮助考生们更好地复习雅思考试，小马过河雅思频道为各位考生整理了雅思阅读全球时事瞭望阅读篇：树木死亡和气候，供考生们参考使用，更多雅思听力辅导请继续关注小马过河雅思频道。树木死亡和气候【时事聚焦】近一个世纪，世界上森林覆盖面积大幅度锐减，除了人为因素的大量砍伐，也有相当数量的树木由于自然气候死亡。自然气候的改变带来的炎热和干旱导致了世界上越来越多的树木奄奄一息。下面我们就来看一则建立在几十篇科学文献基础上，有关此话题的最新报道。TreeDeathsLinkedToClimateChangeHotanddryconditionstriggeredbyclimatechangearekillingtheworld'strees,accordingtoanewreportwhichexaminesdozensofscientificsonthesubject.StanfordUniversitygraduatestudentWilliamAnderegghasseenthisforestdie-offfirsthand.Hisdoctoralthesisdocumentstheimpactofdroughtontremblingaspen,themostcommontreeinNorthAmerica.“Thesearecompletehillsidesoftremblingaspensthataredyingoff,"Andereggsays."Andwhenthemaintreeinaforestgoes,youtendtoseealotoftheotherspecies,especiallythegrassesandthewildflowers,tendtodisappearaswell.Butyoulosealotofthosespeciesfromthoseforests.”ChangingecologyWithcolleaguesfromStanfordandNorthArizonaStateUniversity,Andereggco-authoredthenewreportwhichpresentsapictureofacceleratingworldwidetreedeathsthatappeartobelinkedtochangesintheglobalclimate.Andereggsaysthesechanges,triggeredbyrisinglevelsofheat-trappinggasesintheatmosphere,arestressingtheworld’sforests.“Oneofthewaysthatweexpectclimatechangetoincreasinglyplayoutinforestsisthroughthesewidespreadtreemortalityeventswhereyoustressthetreesenoughthatyouessentiallypushawholeregionofthemofftheedgeandinfactwhathappensafterwards,afteraforestdiesfromdroughtiseverybitasimportantandinsomesensemattersmoretohumanswhorelyonforests.”Treesprovidearangeofecologicalservices.Theyholdsoilinplace,helppurifywaterandshelterspecies.Theyarevaluedfortimberandtourism.Whentreesdie,theecologyandhydrologyofaforestchange,whichinturnpromotesinsectinfestationandfire.Thiscanresultinlong-termshiftsinthearea’sdominantspeciesandmayeventriggeratransitiontoadifferentecosystem,suchasgrassland.DevastatingconsequenceAndereggsaysthemostdevastatingconsequencemaybethatthechangingforests,inturn,willstartaffectingtheglobalclimate.“Becauseforestsdoalottostabilizetheclimateandtostorecarbonandwhentheystarttodieoff,youcanactuallyhaveforestdie-offaccelerateclimatechange,"hesays."Yougetintoaviciouscycle.”ThisisespeciallytroublingforAndereggbecausetrees,whichcover30percentoftheearth’ssurface,absorb25percentoftheclimate-changinggasesemittedintotheatmospherefromcars,buildingsandfactories.ForestmonitoringWhilescientistsaregettingbetterattrackingtheeffectsofclimatechangeonforests,dataisstillsparse.Andereggsayshisstudyurgesgovernmentsandspecialistsfrommanydisciplinestosupportwide-scaleforestmonitoring.“Itisnotjustecologists,butwealsoneedpeopleworkingwithsatellites.Weneedpeopleingovernmentagencies.Weneedpeopleonthegroundtodothisaswell.It’sunfortunatelynotsomethingthatjustthescientificresearchcommunitycanpulloffontheirown.”Anderegg,whoseresearchispublishedinNatureClimateChange,saysabetterunderstandingofhowclimatechangeiskillingofftheworld’sforestscanhelpshapebetterforestmanagement,businessdecisionsandpolicies.【热点话题】根据以上的这则研究报道，我们发现树木死亡的话题和雅思阅读考试有十分紧密的联系，雅思阅读话题中有很多都涉及到环保，生态，这...