准格尔黄土丘陵沟壑区铁杆蒿(Artemisia+sacrorum+Ledeb.)种群特征与生态适应性分析

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1、STUDYoNPoPULATIoNCHARACTERISTICSANDECoLoGICALADAPTABlLlTYoF彳置Z吕M删j己4C霹D露乏7MLEDEB．INJUNGERLoESSHILL．GULLYREGIoNABSTRACTArtemisiasacrorumsteppeoftheInnerMongoliadistributmainlyinthestepperegionofthemountainarea(southernofDaxinganlingmountain，mountainareaofnorthernHebei，Daqi

2、ngmountain，Manhanmountain)，aswellastheloesshill—gullyregion(10esshill·gullyregionofwesternLiaoningandloesshilly-gullyregionofsouthernYinshanmountain)．Artem括iasacrorumcommunityisoneofthenaturalplantcommunitieswhichneedtofocusoninthevegetationrestorationofecologicallyfragil

3、ezoneintheLoessPlateau．Asoneoftheimportantgullyvegetationtype，whichhasaveryimportantroleinreducingsoilerosionandimprovingvegetationbiodiversity．Sobydeeplyinvestigatingandmeasuredcommunitycharacteristic、populationcharacteristic、rootdistributionandphysiologicalandecological

4、characteristics，wejusttriedtoprovidescientificbasisfortherationaluseofplantresources、vegetationconstructionandsoilandwaterconservationintheloesshilly—gullyregion．Themainresultsareasfollows：1．Arsenicrockmatrixhavehigherwatercontent，complexsoilmechanical，gravelandcoarsesand

5、withahigherlevel，highersoilerodibility；Loessmatrixhavelowerwatercontent，morefinesand，lowersoilerodibility．Butthesetwomatrixesarebothhighsoilerodibility．2．Artemisiasacrorumcommunityintheresearchregionaredistributedinhillyslopes、sunnyslopesandshadyslopes，butitsdistributedth

6、emostwidelyintheshadyslope．Communitiesinthearsenicrockmatrixwithhigherwatercontenthavesignificantlyhigherbiologicaldiversityandbiomassperunitareathanthatofloessmatrix，andthemorecomplextypeofcomposition．CommunitiesintwohabitatsontheCOVerishigher，theloesshabitatofabout50％，a

7、ndthearsenicrockandhillyslopeswithbettermoistureconditionsofmorethan80％．3．Artemisiasacrorumaveragebiomassesinthetwohabitatsreachmaximumintheageof7、8，andthedifferenceisnotobvious．AgestructuresofArtemisiasacrommpopulationsinthetwohabitatsarestableinthearsenicrockmatrix，andg

8、rowthintheloessmatrix．TheR：SofArtemisiasacrorumisrelativelysmall．Artemisiasacrorumearlyasage5can