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时间:2019-08-06
《不同发育阶段白刺群落的结构特征及分布格局》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、2012年11月防护林科技Nov.,2012第6期(总111期)ProtectionForestScienceandTechnologyNo.6(SumNo.111)文章编号:1005-5215(2012)06-0004-03不同发育阶段白刺群落的结构特征及分布格局1,212赵倩云,王辉,黄朝珺(1.甘肃农业大学林学院,甘肃兰州730070;2.民勤连古城国家级自然保护区管理局红崖山自然保护站)摘要:对民勤境内沙质草地发育成熟期和发育中期两种不同条件下白刺群落的结构特征及分布格局进行对比分析。结果表明:(1)不同发育阶段白刺群落的结构特征差异不明显,均呈现植被稀疏,结构单一的特征,几乎
2、没有其他的灌木物种分布,零星伴有芦苇、刺蓬、骆驼蓬等草本植物,建群种白刺优势明显。(2)不同发育阶段群落白刺的生长状况差异明显,发育成熟期群落白刺的密度及盖度高于发育中期群落;发育中期群落白刺在整个生长季都有较高的生长量,而发育成熟期群落白刺在整个生长季生长量很小,已基本没有生长能力。(3)不同发育阶段白刺群落长势均较稳定,但更新苗很少,在没有人为干预促进更新的状况下,随着植株的逐渐增长并老化,白刺群落将走向衰败,最终导致草地沙化。关键词:群落;白刺;生长状况;结构特征中图分类号:S718.542文献标识码:AStructuralCharacteristics&Distribution
3、PatternofNitrariatangutorumCommunityintheDifferentDevelopmentStages1,212ZHAOQian-yun,WANGHui,HUANGChao-Jun(1.ForestryInstitute,GansuAgriculturalUniversity,Lanzhou730070,China;2.HongyashanNatureProtectionStation,MinqinLianguchengNationalNatureReserveAdministration)Abstract:Structuralcharacteristi
4、cs&distributionpatternsofNitrariatangutorumcommunitiesundertwodifferentcondi-tions(developmentalmaturitystage&mid-termofdevelopment)ofsandygrasslandinMinqin.Resultshowsthat:1)struc-turalfeaturesofNitrariatangutorumcommunitywithdifferentdevelopmentalstagesarenotsignificantlydifferent,showingthefe
5、aturesofsparsevegetation&singlestructure.Thereisalmostnoothershrubspeciesdistribution,scatteredwithPhragmitesaustralis,Salsolapestifer,Peganumharmala,advantagesofconstructivespecies(Nitrariatangutorum)areobvi-ous.2)differencesofgrowthstatusforNitrariatangutorumcommunitywithdifferentdevelopmental
6、stagesaresignificant;thedensity&coverageofNitrariatangutorumcommunityatdevelopmentalmaturityarehigherthanthatofmid-termofde-velopment;height&branchesofNitrariatangutorumcommunityatmid-termofdevelopmenthavehighergrowththroughoutthegrowingseason;Nitrariatangutorumcommunityatdevelopmentalmaturityst
7、agewhichhavesmallgrowththroughoutthegrowingseasonhasbeenbasicallynogrowth.3)growthvigorofNitrariatangutorumcommunityatdifferentdevelopmentalstagesarestable,butregenerationseedlingisrarelywithouthumaninterventiontopromoterege
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