石羊河下游绵刺群落生态位特征研究

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1、石羊河下游绵刺群落生态位特征研宄赵慧宏曾新德张有佳王承勋李威龙许芳荣贾斌斌张杰甘肃省环境科学设计研宄院甘肃民勤连古城国家级自然保护区管理局【目的】研究石羊河下游绵刺群落物种生态位特征，以期明确绵刺群落各物种对环境的牛.态适应性和种间关系，为绵刺群落的保护、恢复和合理利用提供科学依据。【方法】运用重要值、生态位宽度和生态位重叠度，分析石羊河下游绵刺群落各物种对资源的利用状况，揭示绵刺群落的结构和稳定性。【结果】（1）在绵刺群落中，绵刺的重要值和生态位宽度都明显高于群落中其他物种，为群落优势种。（2）在

2、整个群落中生态位宽度从大到小依次为绵刺、珍珠猪毛菜、蒙古韭、蝎虎驼蹄瓣、细叶骆驼蓬、短叶假木贼等。（3）在整个绵刺群落中生态位宽度和与绵刺生态位重叠度都较大的物种是珍珠猪毛菜和蝎虎驼蹄瓣。（4）绵刺群落屮其他物种之间的生态位重叠程度总体偏低，只有个别的物种之间生态位重叠较大。【结论】石羊河下游绵刺群落处于一个相对稳定的阶段。绵刺、珍珠猪毛菜、蒙古韭、蝎虎驼蹄瓣、细叶骆驼蓬、短叶假木贼等在绵刺群落中生态幅较宽，在植物群落构建中起着重要的作用。生态位宽度大的物种与绵刺生态位重叠度也大。绵刺与珍珠猪毛菜、

3、蝎虎驼蹄瓣等对生境的要求比较相近，首先与这些物种发生竞争。关键词：绵朿U;牛.态位;牛态位宽度;牛.态位重叠度;基金：甘肅省科技支撑计划项目（1304FKCH100,144NKCH057）NicheCharacteristicsofPotaniniamongolicaCommunityintheLowerReachofShiyangRiverZHAOHuihongZENGXindeZHANGYoujiaWANGChengxunLIWeilongXUFangrongJIABingbingZHANGJi

4、eGansuProvinceInstituteofEnvironmentalScienceDesignandResearch;ManagingBureauofLianguchengNationalReserve;Abstract：[Purpose]NichecharacteristicsofPotaniniamongolicacommunityinthelowerreachofShiyangRiverwerestudiedtodeterminethespeciesecologicaladaption

5、totheenvironment,whichprovidesthescientificbasisfortheprotection，recoverandreasonableuseofP.mongolicacommunity.[Method]Bytheuseofimportancevalue,nichebreadthandnicheoverlap,theutilizationofspeciesofP.mongolicacommunitytoresourcesinthelowerreachofShiyan

6、gRiverwasanalyzedtoshowthestructureandstabilityofP.mongolicacommunity.[Results](1)P.mongolicawasthedominantspeciesofthecommunity,theimportancevalueandthenichebreadthofwhichweresignificantlyhigherthanotherspecies.(2)Inthewholecommunity,thenichebreadthfr

7、omlargetosmallwasasfollows:Potaniniamongolica,Salsolapasscrina,AlliummongolicumRcgcl,ZygophyllummucronatumMaxim.,PeganumnigellastrumBge.,Anabasisbrevifolia.(3)S.passerinaandZ.mucronatumMaxim,hadbothhighernichebreadthandP.mongolicanicheoverlapinthewhole

8、P.mongo1icacommunity;(4)ThenicheoverlapoftheotherspeciesintheP.mongolicacommunitywasgenerallylow,exceptfortheindividuals,amongwhichwererelativelyhigh.[Conclusion]TheP.mongolicacommunitywasinarelativelystablestageinthelowerreachofShiyang