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1、EffectsofExogenousPhenolicAcidsonRootsofPoplarHydroponicCuttingsWangHua-Tian*,WangYan-Ping,YangYangForestryCollegeofShandongAgriculturalUniversity,TaianShandong271018,P.R.China,wanght@sdau.edu.cnAbstractPhenolicacidswasagroupofallelochemicalswithproducts,continu
2、ouscroppinghadbecomeaninevitablerelativelyhighactivitywhichwasreportedtohavesignificantmeasureinthemanagementofpoplarplantations(Kong,etaccumulationinsoilofcontinuouscroppingpoplarplantations.al.,2006a).Thesetreesareusuallygrownfor15yearsbeforeTheimpactofphenoli
3、cacidsongrowthanddevelopmentofbeingfelledandreplantedinasecondrotation.Thesecondpoplarswasessentialinresearchesondegradationmechanismofrotationisplantedaftertheloggingdebrisisremoved.forestlandproductivity.TheeffectofphenolicacidsondetailedHowever,it’sreportedth
4、atcontinuouscroppingledtorootsmorphologicchangesofpoplarswasdiscussedinthispaper.degradationoflandproductivity(Sun,etal.，1995；Liu,etFivelevelsofphenolicacidsrespectivelyweresetas0X,0.5X,1X,al.，2005).Ma,etal(1997).reportedthatthedegradationof1.5Xand2X,inwhich,the
5、level1Xwasdeterminedbyactualforestlandproductivitywascloselyrelatedtothendphenolicacidscontentinsoilofthe2generationofcontinuousaccumulationoftoxicmattersinsoilbesidesthedeclineincroppingpoplarplantation,andotherlevelsweredeterminedbynutrientcontent.Waller(1987)
6、putforwardthatallelopathyanalogyfromthevalueof1X.Hydroponiccuttingswereculturedbecameadeterminantinthecompetitionofplantsincertainfor40days,andthenharvestedforobservationandmeasuringcondition.Kong,etal(2000)advocatedthatthestressofrootsmorphologiccharacteristics
7、.Resultshowedthattheresistanceofreceptorplantswasweakenedinadversenumberofroots,meanrootlength,meanrootarea,meanrootenvironmentandthusinducedallelopathytobecomeanforks,meanrootfractaldimensionandmeanrootdryweightgrowthinhibitorofplants.Lin,etal.(2002)alsoreporte
8、dthatweresignificantlyinhibitedbyincreasingconcentrationsofallelopathywasaverycommonphenomenonintheforestphenolicacidswhilemeanrootdiameterandmeanrootwaterecosystemwh
