学科分类
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5 个结果
  • 简介:深秋,驾驶着全新林肯MKX行驶在京北的山路上,望着两旁黄灿灿的秋景,在山间穿行,似乎有种错觉穿越了空间,来到了大洋彼岸的美国东北部新英格兰地区,在佛蒙特州的林荫小路间享受着大自然所赋予的静谧。

  • 标签: 新英格兰 东北部 大自然
  • 简介:TBWA近日宣布,升任LincolnDame为nTBWA\AGENCY.CO创M意总监。之前两年中,他始终担任助理创意总监,建立了一支中国领先的互动网络创意团队。加入TBWA之前,他

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  • 简介:Background:Wildlifeandlivestockgrazingareimportantproductsofforestecosystems,butcanbecontroversial.HerbivorybyNorthAmericanelkanddomesticcattleisacontentiousmanagementissuethroughoutwesternNorthAmerica,oftendrivingmanagementproposalstodecreasecattleandelknumbersbasedonperceivedoverutilizationofforages.Suchobservationsareoftensitelevelratherthanlandscape,andmayconfuseecologicalsustainabilitywithdesiredconditions.Methods:Weusedlinetransectstodocumentvegetationcomposition,structure,andgrazingandbrowsingutilizationfor4keyhabitattypes:mountainmeadows,aspen,thinnedconifer,andburnedconiferonLincolnNationalForest,NewMexico,USA.Wedocumentedrelativehabitatuseofthesetypesbyelk,muledeer,andcattleandmodeledrelativeuseonresidualgrassbiomassofmountainmeadowsandbrowseutilizationofforestedtypes.Wedetermineddietsanddietqualityofelkandcattletoassessdegreeofcompetition.Results:Useofgrassesinmeadowswasbelowmanagementthresholds,andcombinedelk,cattle,anddeerrelativehabitatuseaccountedfor<14%ofthevarianceinresidualstubbleheightofPoapratensis,themostabundantgrass.Palatablebrowsewaslimitedinhabitattypes(<107stems·ha~(-1)),usewasgenerallyhigh,andelkpresencewascorrelatedwiththemajorityofbrowsing.Elkandcattledietsdidnotsignificantlyoverlap(Schoener'sindex0.54–0.57);elkfedprimarilyondeciduousshrubs(34%–55%ofannualdiets)andcattleongrass(72%–77%).Digestibilityandcrudeproteinlevelsofcattledietsandbodyconditionofelkindicatedhighqualitydietsforcattleandmarginal–goodqualitydietsforelk.Conclusions:Atobservedstockinglevelsanddensities,cattleandelkwerenotcompetingforforagebasedondietsimilarity,norwerekeyhabitattypesbeingusedbeyondsustainablelevels.LowbrowseavailabilityindicatesthatopportunityexiststoincreaseforageavailabilityonLincolnNationalForest,andthusmaintainorincreasepopu

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  • 简介:林肯大陆进中国了,这款定价不低的车型试图直接杀入这片神奇土地上打得最残酷的战场之中,会输得有多惨需要时间的检验,反正铁定无法和奥迪、宝马之流抗衡.至于能否打得过它的美国同胞,今天就让我们先在纸面上比划一番吧.

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