外來入侵種鳳眼蓮在不同營養(yǎng)水平下的生長及對本地水生植物的影響.pdf

1、浙江大學(xué)碩士學(xué)位論文外來入侵種鳳眼蓮在不同營養(yǎng)水平下的生長及對本地水生植物的影響姓名：趙月琴申請學(xué)位級別：碩士專業(yè)：生態(tài)學(xué)指導(dǎo)教師：盧劍波20060501外來入侵種風(fēng)眼蓮在不同營養(yǎng)水平下的生長及對本地水生植物的影響ABSTRACTInrecentyears，waterhyacinth(Eichhorniacrassipes(Mart)Solms)，anoxiousinvasivespeciesinfestsmostoflakesandr

2、iversinsouthemCKnanotonlyduetoitsextraordinaryadaptiveabilityandclonalgrowthbutalsodeteriorationinecologicalenvironmentandeutrophicationinsurfacewaterPerformedstudiesshowedthatwater，hyacinthisaC3plant，butitsgrowthrateish

3、igherthanC4plantsThiscanbeexplainedbywhetherotherresourcesfsuch嬲nutrient)supplyamplyornotWhenenvironmentconditionisfeasible，waterhyacinthwillgrowrapidlycoveringallwatersurfaceandbeingthedominantSubmersedplantsarediedforc

4、hangedenvironmentslivingspaceoffloatingplantsisminished，biodiversityislargelyreduced，andthusthevalueofwetlandprotectionandecologicalservicearedirectlyaffected，whichareallasaresultofthewaterhyacinthbioinvasionInthisstudyw

5、eimplementedaseriesofpotexperimentstoinvestigatethegrowthcharacteristicsofwaterhyacinthatthreedifferentnutrientlevels，anditscompetitiveeffectsandmechanismontwonativeplantsLudwigiapeplpoidessspStipulaceaandHydrillavertici

6、llataOurresultsshowedthat：Theimpactsofnutrient—availabilityintheenvironmentsongrowthandclonalpropagationweresignificantRametnumberheightandtotalbiomassincreasedwiththelevelofnutrientsupplyThenumberoframets，heightandbioma

7、ssofwaterhyacinthsignificantlyincreasedasthenutrientlevelincreasedMorphologicalplasticityofitsrootisaIlimportantadaptivemechanismtoacquireresourceRootlengthwouldbelongerunderlow—nutrientconditionNutrientenrichedwateracce

8、leratedthegrowthrateandenhancedthepropagationofwaterhyacinth，whichresultedinreducedgrowthofLudwigiapeplpoidessspStipulaceaandHydrillaverticillataBeingsupplantedbywaterhyacinth，biomassofLudwigiapeplpoidessspStipulaceawasd