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《氮磷比对两种蓝藻生长及竞争的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、农业环境科学学报2012,31(7):1438—1444JournalofAgro—EnvironmentScience氮磷比对两种蓝藻生长及竞争的影响孟顺龙1,一,裘丽萍1,胡庚东1,瞿建宏1,范立民1,宋超1,陈家长1≯,徐跑1,护(1.中国水产科学研究院淡水渔业研究中心,农业部长江下游渔业资源环境科学观测实验站,中国水产科学研究院内陆渔业生态环境和资源重点开放实验室,江苏无锡214081;2.南京农业大学无锡渔业学院,江苏无锡214081)摘要:通过室内实验研究了不同氮磷比条件下主要水华藻类——铜绿微囊藻(Microcystisaerugin
2、isa)和巨颤藻(Oscillatoriaprinceps)的生长和种间竞争。结果表明,无论在纯培养体系还是混合培养体系中,微囊藻在中氮磷HS(N/P=4.5)下生长最好,颤藻在低氮磷比(N/P=0.45)下生长最好;氮磷比对藻类的种间竞争抑制参数能够产生明显影响,中氮磷比时微囊藻对颤藻的竞争抑制参数最大,分别是高氮磷比(N/P=45)和低氮磷比时的1.38倍和1.35倍;而颤藻对微囊藻的竞争抑制参数则是在低氮磷比时最大,分别是高氮磷比和中氮磷比时的2.22倍和4.02倍。中、高氮磷比时微囊藻对颤藻的竞争抑制参数(d)大于颤藻对微囊藻的竞争抑制参数
3、(口),而低氮磷比时则相反。根据Lotka—Volterra竞争模型中两物种的竞争结局可初步判断,中、高氮磷比时,微囊藻在竞争中占优势,低氮磷比时,微囊藻和颤藻不稳定共存。关键词:微囊藻;颤藻;氮磷比;种间竞争中图分类号:X172文献标志码:A文章编号:1672—2043(2012)07—1438—07EffectofNitrogenandPhosphorusRatiosonGrowthandCompetitionofTwoBlue-greenAlgaeMENGShun—lon91。,QIULi-pin91,HUGeng—don91.QUJian—
4、hon91,FANLi—minl,SONGCha01,CHENJia-zhan91-2’,XUPa01,2+(1.FreshwaterFisheriesResearchCenter,ChineseAcademyofFisherySciences;ScientificObservingandExperimentalStationofFisheryResourcesandEnvironmentintheLovcerReachesoftheChangjiangRiver,MinistryofAgriculture;KeyOpenLaboratoryofE
5、cologicalEnvi—ronmentandResourcesofInlandFisheries;ChineseAcademyofFishm7Sciences,Wuxi214081,China;2.WuxiFisheryCollege,NanjingAgriculturalUniversity,Wuxi214081,China)Abstract:MicrocystisaeruginosaandOscillatoriaprincepsarethemostcommonblue-greenalgaeineutrophicationlakeswiths
6、hallowwater.Inordertoknowthegrowthprocessofwaterbloomblue—greenalgaeineutrophicationlakesandtherelationshipbetweenalgaegrowthandnitrogenandphosphorusratios.theexperimentwascarriedouttoresearchtheinterspeciescompetitionbetween舱aeruginosaandO.ptin--cepsatdifferentnitrogenandphos
7、phorusratiosthroughindoorsexperiment.Theresultsindicatedthat舱oPFagillAgsagrewbestatthemiddlenitrogenandphosphorusratio(N/P=4.5)andO.princepsgrewbestatthelowernitrogenandphosphorusratio(N/P=0。45)bothintheuni-cul-luresystemandtheco-culturesystem.Theinhibitionparameterofinterspec
8、iescompetitioncouldbesignificantlyinfluencedbynitrogenandphos
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