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ID:40545405
大小:580.50 KB
页数:10页
时间:2019-08-04
《A hotter climate could make some plants move downhill to seek water》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Ahotterclimatecouldmakesomeplantsmovedownhilltoseekwater,suggestsnewresearchthatchallengestheassumptionthatplantswouldmoveuphilltoreachcoolerelevations.ScientistsattheUniversityofMontana,theUniversityofCalifornia,Davis,andtheUniversityofIdahoarethefirsttofindawide
2、spreaddownwardshiftinCalifornianmountainplants,contradictingearlierresearchshowingthatplantsaremovingupwardsinresponsetoclimatechange.''Thisresearchassumesthattemperatureisthedominantdriverindefiningtheboundariesofwhereplantsandanimalslive,''saysSolomonDobrowski,A
3、ssistantProfessorattheUniversityofMontana'sDepartmentofForestManagement.''Butourworkshowsthatfactorssuchasenergyandwateravailabilitymaybemoreimportant.''DobrowskiandhisteammadethediscoverywhentheycomparedrecordsofplantsgrowingonnorthernCalifornianmountainrangestak
4、eninthe1930swiththesameinformationtaken75yearslater.Totheirsurprise,theysawthattheplants'averageelevationhadmoveddownhillbyabout80metres(262feet)insteadofuphillasexpected,despiteawidespreadriseintemperature.Dobrowskiexplainsthatthemovedownwardswasprobablybecauseof
5、moresnowandrainfallinCalifornia,whichhasincreasedsincethe1930s.Consequently,Californianmountainplantstodayarefindingmorewateravailableatlowerelevationsthanbefore.''Theplantsaretrackingchangesinclimaticwaterbalance-thebalancebetweenhowmuchwaterislosttoevaporationan
6、dhowmuchisgainedfromprecipitation-asopposedtochangesintemperature,''hesays.Thefindingscouldhaveglobalimplicationssincesimilarincreasesinprecipitationhavealsobeenseenelsewhere.''Manylocationsnorthofthe45-degreelatitudehaveexperiencedincreasedprecipitationoverthelas
7、tcenturyandglobalclimatemodelsgenerallypredicttheselocationstobecomewetteroverthenextcentury,''Dobrowskisays.''Themessagehereissimple:understandingfuturetemperaturetrendsisnotenough.Wealsoneedtounderstandhowprecipitationmaychangeandhowthiswillaffectwaterbalance.Si
8、nceplantsformthefoundationformanyecologicalcommunitiesbyprovidinghabitatorfood,fullyunderstandinghowtheyrespondtoalloftheeffectsofclimatechangeiscritica
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