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时间:2018-12-07
《干热河谷主要植被恢复树种水分利用效率的动态变化规律》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、干热河谷主要植被恢复树种水分利用效率动态分析”段爱w张建tr张俊佩何彩云(中国林业科学研究院林业研究所,国家林业局林木培育重点实验室,北京100091)摘要:以元谋县金沙江干热河谷区14个树种为试材,探讨了干季(3月)、干热季(5月)和湿润季(10月)典型晴天里各树种水分利用效率日动态规律,以揭示极端T•热生境条件下供试树种水分利用效率的动态特征,并展开比较分析,结合它们在当地的实际表现,讨论了其适应性和应用前景。研宂表明:供试树种水分利用效率在不同季节均可划分为高、屮、低三种类别,同一树种在不同季节所屈的类别具冇较大差别,在季节性干热胁迫鲜
2、明的干热河谷,供试树种水分利川效率的円动态响应机制具冇明显的季节效应。在千季转向千热季阶段,干热胁迫的加深明显促进丫WUE日变化峰值的提前出现,亦使WUE更早地受到抑制而下降:在干热季转向湿润季阶段,供试树种水分利用效率日变化峰位延后,部分树种水分利用效率“午睡”现象消失,印楝、新银合欢、苏门答腊金合欢及木豆水分利用效率提高较大,在湿润季节里获得较商的光合生产力,从而增强树种在干热河谷区的存活能力。在干热季和湿润季同时具有较高或中等水分利用效率的树种冇余甘子、山毛豆、车桑子、小桐子和山合欢等5个树种。关键词:干热河谷;植被恢复;水分利用效率;
3、円变化;季节变化中图分类号:文献标志码:文章编号:DLANAi-guo;ZHANGJian-guo;ZHANGJun-pei;HECai-yun.Studiesondynamicsofwater-useefficiencyofthetreespeciesforvegetationrestorationinthedry-hotrivervalleys.JournalofBeijingForestiyUniversity(2010)ResearchInstituteofForestry,CAF;KeyLaboratoryofForestSilvi
4、cultureoftheStateForestryAdministration,Beijing100091,P.R.China.Water-useefficiencyof14naturalgrowthtreespeciesforvegetationrestorationinthedry-hotvalleysoftheJinshaRiverinYuanmoucountywasstudiedontypicalsunnydayinthedryseason(March),dryandhotseason,wetseason(October)inorde
5、rtorevealthedynamiccharacteristicsofwater-useefficiencyoftestedtreespeciesundertheconditionofextremelydryandhotenvironment.Thewater-useefficiencyoftestedtreespecieswerecompared,andintegratingthepracticalgrowthcondition,theadaptabilityandapplicationforegroundofthetestedtrees
6、pecieswereanalyzed.Thewater-useefficiencyoftreespeciesindifferentseasonsallcouldbedividedintothreeclassificationssuchashigh,middleandlowwater-useefficiency,sometreespeciesbelongedtodifferentclassificationindifferentseasons,inthedry-hotrivervalleywithobviousseasonaldry-hotst
7、ress,thedailyresponsemechanismofwater-useefficiencyhadobviousseasonaleffects.WhengrowthenvironmentvariedfromdryinMarchtodryandhotinMay,thepeakvalueofdailychangeofwater-useefficiencywasmadecomeahead,andthewater-useefficiencywassufferedfromenvironmentrestriction,anddescendedw
8、iththedry-hotstressgettingdeep,thedailyaveragesofwater-useefficiencyofmosttreespec
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