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1、西北林学院学报2007,22(5):32～36JournalofNorthwestForestryUniversity桂林岩溶石山青冈栎种内与种间竞争的数量关系a11311,2胡 刚, 梁士楚, 张忠华, 许为斌(1.广西师范大学生命科学学院,广西桂林541004;2.广西壮族自治区中国科学院广西植物研究所,广西桂林541006)摘 要:根据野外调查数据,采用Hegyi单木竞争指数模型,定量地研究了桂林岩溶石山建群种青冈栎的种内、种间竞争关系。结果表明,青冈栎所受到的竞争强度随着林木径级的增大而逐渐减小,种内竞争明显
2、较种间竞争剧烈。青冈栎种内和种间竞争强度的顺序为:青冈栎>石山樟>亮叶槭>圆叶乌桕>光叶海桐>翅荚香槐>梧桐>黄连木>铁屎米>粗康柴。整个林分以及青冈栎种内对对象木的的竞争强度与对象木胸径之间的关系近似服从幂函数关系,而伴生树种对对象木的竞争强度与对象木胸径之间的关系近似服从对数函数关系,对象木胸径与竞争强度间呈显著负相关关系。关键词:青冈栎;种内竞争;种间竞争;竞争指数;岩溶石山中图分类号:S718.542 文献标识码:A 文章编号:100127461(2007)0520032205Quantitative
3、RelationshipsofIntraspecificandInterspecificCompetitioninCyclobalanopsisglaucainKarstHillsinGuilin11311,2HUGang,LIANGShi-chu,ZHANGZhong-hua,XUWei-bin(1.CollegeofLifeSciences,GuangxiNormalUniversity,Guilin,Guangxi541004,China;2.GuangxiInstituteofBotany,GuangxiZh
4、uangAutonomousRegionandChineseAcademyofScience,GuangxiGuilin541006,China)Abstract:Accordingtothefieldinvestigationdata,theintraspecificandinterspecificcompetitionintensityofCyclobalanopsisglaucainKarsthillsinGuilinwasquantitativelyanalyzedbyusingHegyisingle2tre
5、ecompetitionindexmodel.TheresultsshowedthatthecompetitionintensityinC.glaucadecreasedgraduallywiththeincreasetreediameterclassandtheintraspecificcompetitioninC.glaucawasmoreintensivethantheinterspecificcompetition.Thedegressiveorderoftheintraspecificandinterspe
6、cificcompetitionintensitywasasfollows:intraspecific>Cinnamomumsaxatile>Acerlucidum>Sapiumrotundifolium>Pittosporumglabratum>Cladrastisplatycarpa>Firmianasimplex>Pistaciachinensis>Canthiumdicoccum>Mallotusphilippinensis.Therelationshipsofthediameteratbreastheigh
7、t(DBH)ofobjectivetreesandthecompetitionintensitybetweencompetitivetreesandobjectivetreesinthewholeforestandC.glaucapopulationnearlyconformedtopowerfunction,whilethatbetweenothercompetitivetreesandtheobjectiveC.glaucatreesconformedtologarithmfunction.TheDBHofthe
8、objectivetreeswassignificantlynegativecorrelationwithcompetitionintensity.Keywords:Cyclobalanopsisglauca;intraspecificcompetition;interspecificcompetition;competitionindex;K
