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1、黄土高原柴松群落优势种群更新研究中国蓉擘通搪2011,27(8):7—12ChineseAgriculturalScienceBulletin黄土高原柴松群落优势种群更新研究崔长美,王孝安,郭华(陕西师范大学生命科学学院,西安710062)摘要:为了探讨柴松(Pinustabulaeformisfshekannesis)群落优势种群的更新特点及其不同林型对优势种群更新机制的影响,笔者采用样方法调查了黄土高原柴松群落(柴松纯林及柴松一辽东栎(Quercuswutaishanica)混交林)内柴松及辽东栎种群的径级
2、结构和幼苗数量,分析了种群及幼苗的更新动态,幼苗的死亡率和原因.结果表明:纯林和混交林内柴松以及纯林内辽东栎种群及幼苗大小结构整体上都呈反"J"字型,表明种群为增长型种群.而混交林内辽东栎为成熟性种群;混交林内的环境条件更适于柴松幼苗的初期生长,而柴松幼苗后期生长在纯林内较好.柴松幼苗密度在各群落类型中均低于辽东栎,且数量较少.根据幼苗的数量及生长趋势来看,柴松林下更适宜于辽东栎幼苗的生长.关键词:柴松群落;种群更新;幼苗;大小结构;死亡率中图分类号:Q948.15文献标志码:A论文编号:2010.2617St
3、udiesonPreponderantPopulationsRegenerationofPinustabulaeformisf.shekannesisCommunityonLoessPlateauCuiChangmei,WangXiaoan,GuoHua(CollegeofLScience,ShanxiNormalUniversity,Xi'an710062)Abstract:Todiscusstheregenerationcharacteristicofthedominantpopulationsanddif
4、ferentforesttypes'influencesonthem,asystematicstudyonpopulationsstructureofPinustabulaeformisf_shekannesisandQ.ercuswutaishaniea.aswellasseedlingsquantityinPinustabulaeformisshekannesmcommunityonloessplateauwereaccomplishedbyusingquadratsamplingmethod.Thereg
5、enerationdynamicsofpopulationsandseedlings,themortalityandcausesofseedlingswereanalyzed.Theresultsshowedthatpopulationsandseedlingsoftabu&eformis￡shekannesisinpureandmixedforest.aswellasQuercuswutaishanieapopulationinpureforestappearedtodistributeinaninv
6、ersed'J'shape,whichindicatedtheyweredevelopingpopulations.Quercuswutaisbanieainmixedforestwasagrownuppopulation,environmentalconditionsinthemixedforestweremoresuitablefortheearlierseedlingsbutlessforlatergrowth.Thedensityoftabulae[ormis1.shekannesisseedlings
7、waslowerthanthatofQ.1iaotungenMs,theseedlingbankofP.tabulae~ormist.shekannesmpopulationinthisareawasalsopoor.ComparativelyP.tabulaeformist.shekannesispopulationmightbemoresuitableforthegrowthofQuercuswutaishaniea.Keywords:tabulaeformisfshekannesmcommunity;re
8、generation;seedling;sizestructure;themortality0引言植物种群结构是现时和过去生物和非生物力共同作用于种群的结果,是种群发育过程中每个个体实现其增长机会的一种表达,也是对立地条件优劣及植物对环境适应性的反映..对组成群落的优势种群,种群大小是树种生殖能力(即树种更新潜力)的指示者H.大小结构也可以反映种群的数量动态和发展趋势,并在一定程度上反
