渾善達克沙地桑根達來地區(qū)榆樹疏林林草特征的研究.pdf

1、內蒙古農(nóng)業(yè)大學碩士學位論文渾善達克沙地桑根達來地區(qū)榆樹疏林林草特征的研究姓名：張靖媛申請學位級別：碩士專業(yè)：水土保持與荒漠化防治指導教師：李鋼鐵20090501StudiesoncharacteristicsofTreesandGrassUlmuspumilaLvars口6“ZDs口WoodlandofSanggendalaiinHunshandakeSandyLandAbstraetZj，Z，竹zlsp“mi／aLvarsabⅣ，∞口

2、JHGuoYSLietJHLiwoodlandwasdividedinto4sitet)，pestostudyinthegrazingareasofSanggendalaiinSandyLandTheresultshowed：(1)The4sitetypesincludedlandsbetweendunes，thetopofdunes，leewardslopeandwindwardS10peTheresultshowedthatwith

3、thewidermiddlepartandtherelativelynarrowtopandbottomparttheagestructuregraphsofU／muspumilaLvarsabulosapOpulati咖in4sitetypesshowedkettleshapeA1lthe4sitetypesbelongtothetypicaldecliningt，門peTheagestructureoftheindividualUl

4、muspumilaLvarsabulosaofelmpopulationclosetoeachotherandshowednosignificantlydifferentinthe4sitetypesAlmostalltheUlmuspumila上varsabulosasintheUlmuspumilaLva，=sabulosapopulationwereinyoungormaturestagewiththeshortageofseed

5、lingandadVerSerenewal(2)TheaverageplantheightofUlmuspumilaLva，：sabulosawas617to677m，TheaveragebasaldiameterofUlmuspumila三varsabulosawas2275to2988centimetersTheaveragecrownofUlmuspumila￡varsabulosawas40tO44squaremeterTheg

6、rowth0fUlm“SpllmilaL、tnrsnbulosawasbestinthelandsbetweendunesandtheaveragebasaldiameterofUlmuspumilaLvarsabulosareached2988centimeters(3)neresultshowedthat62herbsgrewinthegrazingareas，amongCompositaewerethemost，quantityo

7、fsinglegenusoffamilysinglespeciesoffamilyandsinglespecieswasmoreQuantityofsinglegenusoffamily、singlespeciesoffamilyandsingleSDecieswasmorethan70％in4sitetypesSpeciescompositionwerecomplicatedFJoraWasahighdegreeoffragmenta

8、tion，Compositionwasfragileinallthegrazingareas(4)Typesofherbaceousplantsweremoreinleewardslopethanother3sitetypesTherewere49grassplantswhichwascontained22familyor40genus(5)Per鋤ialherbwasmorethan50％in4sitetypesMesophytewa

9、smoreInleewardslopebutxerophilwasmoref缸thewaterecologicaltypesinother3sitetypes(6)Productioncapabilityoflandsbetweenduneswasthebestbecausebiomassoflandsb咖eenduneswasthebestin4sitetypesTherophyteWastheconstructivespeclesi