黄河三角洲潮间带柽柳灌丛的格局及结构动态研究-生态科学

《黄河三角洲潮间带柽柳灌丛的格局及结构动态研究-生态科学》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、第36卷第1期生态科学36(1):1531582017年1月EcologicalScienceJan.2017刘亚琦,刘加珍,陈永金,等.黄河三角洲潮间带柽柳灌丛的格局及结构动态研究[J].生态科学,2017,36(1):153158.LIUYaqi,LIUJiazhen,CHENYongjing,etal.ResearchondistributionpatternsandpopulationstructureofTamarixChinensisintheintertidalzoneofcoastalwetlandsinYellowRiverDelta[

2、J].EcologicalScience,2017,36(1):153158.黄河三角洲潮间带柽柳灌丛的格局及结构动态研究*刘亚琦,刘加珍,陈永金,靖淑慧,冯若昂,毛甘霖聊城大学环境与规划学院,山东聊城252000【摘要】采用聚集度指标与种群结构动态量化法,分析了黄河三角洲潮间带柽柳灌丛的分布格局与结构动态变化。结果表明:(1)在潮间带,柽柳种群从幼苗、小灌木至中灌木都服从集群分布,大灌木为随机分布;柽柳个体幼苗多生长在母体周围,以母体为中心进行繁衍,随着径级的增加,种群个体间的竞争增加,聚集度减小,逐渐呈现随机分布。(2)柽柳种群结构呈纺锤型;高度级失稳

3、率指数显示幼苗和小灌木有很高的衰退速率,随着群落的演替发展,龄级较大的柽柳优势地位将被削弱。(3)种群动态预测表明,种群明显处于衰退的早期阶段,中小灌木的个体数量减少,大灌木个体数增加,达到数量高峰;虽然群落在短时期内会保持稳定,但大灌木(或老龄个体)的数量大幅减少后,柽柳种群将面临重度衰退。关键词：柽柳种群;黄河三角洲;潮间带;分布格局;结构动态doi:10.14108/j.cnki.1008-8873.2017.01.021中图分类号：S793.5文献标识码：A文章编号：1008-8873(2017)01-153-06Researchondistribu

4、tionpatternsandpopulationstructureofTamarixChinensisintheintertidalzoneofcoastalwetlandsinYellowRiverDelta*LIUYaqi,LIUJiazhen,CHENYongjing,JINGShuhui,FENGRuoang,MAOGanlinSchoolofEnvironmentandPlanning,LiaochengUniversity,Liaocheng252000,ChinaAbstract:BasedonthedataofTamarixchinensi

5、sintheintertidalzoneofcoastalwetlandsinYellowRiverDelta,ascertainingpopulationpatternsanddynamicchangeswereinvestigated.Theresultsareasfollows.(1)Seedlings,smallandmiddleshrubsperformedapatternofclusteringdistribution;largeoneswereapatternofrandombecauseofcompetitionincreasing.Most

6、ofseedlingsgrewinthematernalsurrounding.(2)T.chinensis’agestructurewasaspindletype.Highnessclassstructureindicatedtheratesofdeclineofseedlingsandsmallshrubswerehigh.Withthedevelopmentofthecommunity,thedominanceoflargeroneswouldbeweakened.(3)Populationdynamicspredictionindicatedthat

7、thepopulationwasintheearlydepressionstage;thenumberoflarge-sizedshrubwasexpectedtoincrease,whereasthenumberoftreesinothersizeclasseswasexpectedtodecrease.Althoughthecommunitywillremainstableinashortperiodoftime,T.chinensispopulationwillfacesevererecessionafterthenumbersofthelargers

8、hrubs(oroldindividuals)hav