g111公路讷嫩段18种护坡植物根系固土特性分析

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1、AbstractThesegmentfromNehetoNenjiangoftheNationalhighwayG1ismoreserioussandstormarea．Filteringthetypeswhichofhighersoil．holdefficiencyhaveimportaultsignificancefortheHighwayslopevegetationrestoration．Inourstudy,weselectedeighteennortheasterncommonplantstodiscu

2、ssthesesoild—holdeffectivenessbyusingundisturbed．soiltroughscouringmethodforSoilanti—scourabilityenhancementandhydrostaticcollapsemethodforsoilanti’erodibility,andfinallyusingprincipalcomponentsanalysisanalvzedt11efactorswhichrelatedtosoilcorrosionresistance．T

3、hemainresearchresultsareaSfoilows：1．Shrubs：(1)Therootdistributioninsoilforeightshrubspecieshadgreatdifference；Thesoilantiscourabilityforthesamespeciesincreasedwiththeincreaseofthesoildepth．decl．easedwiththeincreaseoftheslopeanddecreasedwiththeincreaseoftheprec

4、ipitation；Thebiomassoftherootswhoselengtharelessthan1iron,thelengthofthewholeroot,andthecontentsoforgamcmatterandavailablepotassiumwereveryimportanttodeterminethesoilantiscourabilitybytheprincipalcomponentsanalysis，whichhadstrongereffectsundertheheavyrainwashi

5、ng．ThecommonfactorvariancesforaboverootandsoilfactorSintheprincipalcomponentanalysiswere0．99，0．98，0．98，and0．97respectively；theorderofthesoilantiscourabilityforeightshrubsisSyringaoblata>Forsythia肌口，z凼^“廊口>CbM嬲口，6口>Ligustrumobtusifo厅“聊subsp．suave>Weigetaflorida

6、>Platycladuso吨以纫凰>尸砌以淞tomentosa>Caraganaarborescens．WerecommendedthefirstfourspeciesastheplantSofvegetationrecoveryinthisarea．(2)Differenttreespecieswithdistinctenhancementeffectonsoilanti-erodibility,as谢ththesoildepthincrease，thecorrosionindexgoesdownward．Bes

7、ides，therelationshipbetweenthesoilerosionindex(S)andtheimmersiontime(t)isathreetimesfunctioncurveineachdifferentspecies(R2三0．82)．Micro-aggregates，Organicmatter，AvailableK>5mill．0．5-2mmlargesoilaggregates，<1nlillrootbiomassandrootlengtharealltidingkeyrolesonthe

8、soilanti。erodibilityenhancementeffect，andtheircommonfactorvari锄cesarea11morem锄O·90·Theorderoftheenhancementeffectforthe9speciesis：SyringaDblata>C-口阳g口船arborescens>Climbingcypress>C