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《干熱河谷主要植被恢復(fù)樹(shù)種水分利用效率的動(dòng)態(tài)變化規(guī)律》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、干熱河谷主要植被恢復(fù)樹(shù)種水分利用效率動(dòng)態(tài)分析”段愛(ài)w張建tr張俊佩何彩云(中國(guó)林業(yè)科學(xué)研究院林業(yè)研究所，國(guó)家林業(yè)局林木培育重點(diǎn)實(shí)驗(yàn)室，北京100091)摘要：以元謀縣金沙江干熱河谷區(qū)14個(gè)樹(shù)種為試材，探討了干季(3月)、干熱季(5月)和濕潤(rùn)季(10月)典型晴天里各樹(shù)種水分利用效率日動(dòng)態(tài)規(guī)律，以揭示極端T?熱生境條件下供試樹(shù)種水分利用效率的動(dòng)態(tài)特征，并展開(kāi)比較分析，結(jié)合它們?cè)诋?dāng)?shù)氐膶?shí)際表現(xiàn)，討論了其適應(yīng)性和應(yīng)用前景。研宂表明：供試樹(shù)種水分利用效率在不同季節(jié)均可劃分為高、屮、低三種類(lèi)別，同一樹(shù)種在不同季節(jié)所屈的類(lèi)別具冇較大差別，在季節(jié)性干熱脅迫鮮
2、明的干熱河谷，供試樹(shù)種水分利川效率的円動(dòng)態(tài)響應(yīng)機(jī)制具冇明顯的季節(jié)效應(yīng)。在千季轉(zhuǎn)向千熱季階段，干熱脅迫的加深明顯促進(jìn)丫W(wǎng)UE日變化峰值的提前出現(xiàn)，亦使WUE更早地受到抑制而下降：在干熱季轉(zhuǎn)向濕潤(rùn)季階段，供試樹(shù)種水分利用效率日變化峰位延后，部分樹(shù)種水分利用效率“午睡”現(xiàn)象消失，印楝、新銀合歡、蘇門(mén)答臘金合歡及木豆水分利用效率提高較大，在濕潤(rùn)季節(jié)里獲得較商的光合生產(chǎn)力，從而增強(qiáng)樹(shù)種在干熱河谷區(qū)的存活能力。在干熱季和濕潤(rùn)季同時(shí)具有較高或中等水分利用效率的樹(shù)種冇余甘子、山毛豆、車(chē)桑子、小桐子和山合歡等5個(gè)樹(shù)種。關(guān)鍵詞：干熱河谷；植被恢復(fù)；水分利用效率；
3、円變化；季節(jié)變化中圖分類(lèi)號(hào)：文獻(xiàn)標(biāo)志碼：文章編號(hào)：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
