水曲柳和落葉松細(xì)根構(gòu)型研究.pdf

1、學(xué)校代碼：10225學(xué)號：05159學(xué)位論文水曲柳和落葉松細(xì)根構(gòu)型研究指導(dǎo)教師姓名申請學(xué)位級別：論文提交日期：授予學(xué)位單位：王向榮王政權(quán)教授碩士2005年05月東北林業(yè)大學(xué)東北林業(yè)大學(xué)學(xué)科專業(yè)：森林培育論文答辯日期：2005年06月授予學(xué)位日期：答辯委員會主席論文評閱人畚必櫛景犬擎未鐮瑟寥零刃壘立公右“攀東北林業(yè)大學(xué)碩士學(xué)位論文AbstractItiswidelyappreciatedthatabetterunderstandingof

2、theplantrootarchitectureandfunctionvariationiSaveryimportantresearchobjectivesThestudywillprovidebasicscientificdatafortherootsystemmodularbuilding，andalSOcontributetothepreciseevaluationofcarbonandnutrientdynamicattheec

3、os)rstemSCaleWestudiedarchitecturecharacteristics(diameterlengthandspecificrootlengthetc)ofdifferentfinerootbranchordersbetweentwotreespeciesLarixgmeliniandFraxinusmandshuricaonMaoershanForestResearchStation(4502l’45025’

4、N，127030’127034’E)whichownedbyNortheastForestryUniversityChinaBothashandlarchforestswereplantedinl986Wecollectedt11efinerootsamplesfromtwosoildepths(ie010cm，lt20cm)inMay15，July15andSeptember15of2003Afterwashing，therootsy

5、stemwasdissectedinto5orders，excepttheIxorderrootsfromhigherorderrootsAfterdissecting，finerootlength，diameteranddryweightofagivenorderweredeterminedTheobjectiveofthisstudyWastoexaminehowrootlength，diameterspecificrootleng

6、th(SRL)wererelatedtorootbranchingpatternandtheirvariationwithdifferentseasonorsoildepthTheresultsshowthatmeandiameters(po001)andlength(P005)offinerootaredifferentsignificantlyfromfirstorderto6魅orderandincreasedregularly慚

7、mincreasingrootorderinbothspeciesButtheSRLandtotallengthonaunitareadecreasedobviouslywiththeincreasingrootorderThemeandiametersoffirstorderrootswere026mmforashand034mmforlarchandthatofthefifIh—orderrootswere154ramand170m

8、mforashandlarcheachrespectivelyM1enthediametersaresmaller也aIl2mmandlmmfinerootsofbothspeciesincludefiveorders(ash)andfourorders(1arch)respectivelyIfthediametersoffinerootsaredefinedaslessthan05mmpreviousthreeordersforash

9、rootsandtwoordersforIarchrootswouldbeincludedasfinerootpopulationWithinthesamerootordersvariationsoffinerootdiameterarealSOobviousDiameterrangesincreasedwithincreasingrootordersTheseresultssuggestthatbothdiameterandorder

10、cannotbeignoredinestimatingfmerootlifespanandturnoverTotallengthoffirstthreeorderrootsconstitute953％and857％ofa11meorderrootlength，andtheirSRLwaremuchhi曲erthanthe4and5orderroots，whicharethemostimportantwaterandnutrientsab

11、sorbcomponent1xorderrootsfromthehigherorderrOOtSmakeup12％oftotalrootlength，shouldnotbeignoredalsoResponsetotheresourceavailability，numberandarchitectureofeachorderrootspresentclearlyseasonanddepthvariationBecausefinerroo

12、tsf13orders)werelargerintotalnumberandlength，therefore，theirdeathhadanimportantinfluenceonthenutrientuptake，soilnutrientcycleandCallocationinplantsKeywords：Larixgmelini；Fraximtsmandshurica；rootorder；rootarchitecture；seas