苦草(Vallisneria-natans)衰亡对水-沉积物之间磷迁移的影响
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2020-03-14 10:36:29
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J.LakeSci.(湖泊科学),2016,28(1):94—104D0I10.18307/2016.0111⑥2016byJournalofLakeSciences苦草(Vallisnerianatans)衰亡对水一沉积物之间磷迁移的影响俞振飞,徐东坡’,王国祥,周彦峰,吴晓东,张敏莹(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,无锡214081)(2:南京师范大学地理科学学院,江苏省环境演变与生态建设重点实验室,南京210023)(3:中国科学院南京地理与湖泊研究所,南京210008)摘要:采用沉水植物苦草(Vallisnerianatal~)为研究对象,在其衰亡期测定群落内、外上覆水及沉积物各形态磷的含量,以探究沉水植物在其衰亡期对上覆水和沉积物中各形态磷的影响.结果表明:苦草衰亡过程中上覆水中总磷、可溶性总磷、溶解性活性磷、颗粒磷、可溶性有机磷浓度的变化相对平稳,与对照组相比无显著差异;沉积物中各形态磷含量均呈小幅度上升趋势,在实验结束时,苦草组沉积物中总磷含量为719.27me/kg,和初始值比增加了14.68me=/kg,无机磷和有机磷含量分别增加了12.06和2.20me/kg,氢氧化钠提取磷和盐酸提取磷含量分别增加了7.O5和4.29me/kg.总体来看,沉水植物苦草在其衰亡过程中分解速率较慢,对水一沉积物之间各形态磷含量无显著影响.关键词:苦草;衰亡期;上覆水;沉积物;磷形态EfectsofdeclinephaseofVallisnerianatan$onphosphorustransportationbetweenwaterandsedimentYUZhenfei,XUDongpo,WANGGuoxiang,ZHOUYanfeng,WUXiaodong&ZHANGMinying(1:FreshwaterFisheriesResearchCenter,ScientificObservingandExperimentalStationD,FisheryResourcesandEnvironmentintheLowerReachesoftheChangjiangRiver,KeyLaboratoryofEcologicalEnvironmentandResourcesofInlandFisheries,ChineseAcademyofFisherySciences,MinistryofAgriculture,Wuxi214081,P.R.China)(2:CollegeofGeographicalScience,NanjingNormalUniversity,JiangsuKeyLaboratoryofEnvironmentalChangeandEco-logicalConstruction,Nanjing210023,P.R.China)(3:NanjingInstituteofGeographyandLimnologyChineseAcademyofSciences,Nanjing210008,P.R.China)Abstract:Inordertostudytheeffectsofsubmergedmaerophytesondiferentformsofphosphorusduringdeclinephase,weadopt-edVallisnerianatansasthestudyobjectandmeasuredthecontentofphosphorusinwaterandsediment.Resultsshowedthat,inwater,totalphosphorus(TP),dissolvedtotalphosphorus,solublereactivephosphorus,particlesphosphorus,anddissolvedor-ganicphosphorusinnatanschangedsteadily,withoutanysignificantdifferencecomparedwithcontrolgroups,whileallformsofphosphorusinsedimenthadalittlerisingtrend.Attheendoftheexperiment.thecontentofTPwas719.27me/kginthena—tartssediment,andwas14.68ms/kghigherthantheinitialvalue.Theinorganicphosphorus,organicphosphorus,NaOH—P,andHC1一Pcontentsraisedfor12.06,2.20,7.05and4.29
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