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1、SpatialDistributionPatternofPopulationsofIsoetessinensisPalmer,anEndangeredQuillwortinChinafNaturalSciencesArticleID:10071202(2006)030694-05VoI.11No.32oo6694.698SpatialDistributionPatternofPopulationsEndangeredQuillwortinChina口WANGJingyuan',RobertWahitiGiturum,CHENJinming1,W
2、ANGQingfengt'1.CollegeofLifeSxqences,WuhanUniversity,Wuhan430072,Hubei,China;2.]:k)tanyDepartmenl,JomoKenyattaUniversityofAgricultureandTechnology,P.O.Box62000—00200,Nairobi,KenyaAbstract:ThedistributionpatternofIsoetessinensispopulationswasinvestigatedinrelationtoitsbiologi
3、ca1eharacteristicssuchasagestruttureandregenerationmode,andthemicroenvironment.Contagiousdis-tributionpatternwasfoundinpopulationsofal1sizes.Underthesameclimaticandsiteconditions,theheterogeneityofmicroenvironmentresubtingfromthedifferentdepthsofwaterandsoilerosionsignifican
4、tlyaffectedthetypeandscaleofdistributionpatternsof]soetessinensispopulations.Evenatthesamesite,thecenterandtheedgesofthewaterbodyhaddifferenteffectsonthedistributionpatternoftheplants.Asoneoftheco-dominants,thedistributionofIsoetessinensisincommunitieswasaffectedbyotherdomin
5、antspecies,especiallybytheevergreengrassspe—cies.Wateristhemajorfactordeterminingthedistributionpatternoflsoetessinensisinvariouscommunities.Thepatternofcontagiousdistri—butionwasobservedindifferentsizeofpopulationsofJ.sinensis,howev—ertheIAoydindicesobtainedforthepopulation
6、sofvarioussizesdifferedsignificantly.Keywords:quillwort;population;distributionpattern;distributionscale;conservationCLCnumber:Q14Receiveddate.20051l28Foundationitem:SupportedbytheStateKeyBasicResearchand1)evelot~mentProgram(G2000046805).Biography:WANGJingyuan(1976),male,Ph.
7、D.candidate,researchdirection:conservationbiology.E-mail:juior@xinhuanet.comt"Ibwhomcorrespondenceshouldbeaddressed.E-mail:qfwang@whu.edu.cn0IntrOduCtiOnsoetesisaprimitiveva池scu,larwplahntidimportantpositionintheevolutionaryhistoryofthepteridophytes.Isoetessinensisisalsorepr
8、esentativeofalimitednumberofaquaticplantsthatdisplaycrassulaceanacidmetabol
