上LakeSci．(湖泊科学)，2014，26(3)：379．384http：／／www．jlakes．org．E—mail：jlakes@nighs．ac．ca@2014byJournalofk_|}eSciences太湖3种优势微囊藻对不同形态磷的吸收利用+岳涛1’2，张德禄3，胡春香H+(1：中国科学院水生生物研究所藻类生物学重点实验室，武汉430072)(2：中国科学院大学，北京100049)(3：武汉理工大学生物科学与技术系，武汉430070)摘要：微囊藻(Microcystis)是最常见的淡水水华蓝藻，它们对磷营养盐的竞争力是其成为优势种的最主要影响因素．本文以太湖水华中的3种优势微囊藻(Microcystisflos—aquae，Microcystiswesenbergii和MicrocystisaelTzginosa)为材料，比较研究了它们对正磷酸盐(K2HP04)、三聚磷酸盐(NasP30lo)、小分子溶解态有机磷(葡萄糖_6磷酸，G-6一P)和大分子溶解态有机磷(卵磷脂)的吸收和利用能力．结果发现，3种微囊藻对4种磷形态有明显的嗜好．当磷浓度为0．2ms／L时，M．flo,一aquae只在正磷酸盐下生长最快，肛wesenbergii在三聚磷酸盐和大、小分子有机磷下生长最快，胍aeruginosa在所有磷形态下生长都最慢．而当磷浓度为2．0mg／L时，M．flos—aquae在所有形态磷下生长都最快．在2种磷浓度下肛waenbergii都表现出最高的溶解态无机磷比例和光合活性F，／F。．以上结果说明，3种藻在磷形态利用方面存在明显的互补性差异，即低磷浓度下胍wesenbergii适宜利用的磷形态更多，高磷浓度下M．flos—aquae适宜利用的磷形态更多，而不论磷浓度高低，M．aelT．tgirtosa对4种形态磷的适应性最差．由此可知，可利用磷形态的丰富性只是部分优势微囊藻的竞争策略．关键词：微囊藻；磷形态；溶解态无机磷；光合活性；太湖UtilizationofphosphorusinfourformsofthethreedominantMicrocystismorphospeciesinLakeTaihuYUETa017，ZHANGDelu3&HUChunxian91(1：KeyLaboratoryofAlgalBiology，InstituteofHydrobiology，ChineseAcademyofSciences，Wuhan430072，P．R．China)(2：UniversityofChineseAcademyofSciences，Beijing100049，P．R．China)(3：DepartmentofBiologicalScienceandTechnology，WuhanUniversityofTechnology，Wuhan430070，P．R．China)Abstract：Microcystisisthemostcommonbloom—formingcyanobaetefiainfreshwater．Itsabilityinphosphorusufihzafioniseonsid—ered8Samajorfactorfortheirdominance．ThisstudychosethreedominantMicrocystismorphospecies(Microcystisflos—aquae，Mi-crocystiswesenbergiiandMicrocystisaerugiansa)inthebloomsofLakeTaihu，andcomparedtheirgrowthandphosphorusutilizationoforthophosphate(K2HP04)，polyphosphate(NasP30Io)，ghcose石一phosphate(G-6一P)andlecithin．Themsultsshowedthatthethreemorphospeciesrepresenteddifferencestophosphorusoffourforms．Undertheconcentrationof0．2ms／L．胍flos·aquaegrewfastestinK2HP04，whileMwesenbergiihadthehighestgrowthratesinNa5P3Omandlecithin．M．∞m百Ⅷshowedthelowestgrowthrates．Oncontrary．肛flos—aquaehadthehighestgrowthratesundertheconcentrationof2．0mg／L．Furthermore，M．wesenbergiishowedthehighestdissolvedinorganicphosphorusratesandphotosyntheticactivityintermsofFv，Fminbothphos—phorusconcentrations．Theseresultsimpliedthattherewerevariationsinphosphorusutilizationamongthethreemorphospecies．M．flos·aquaehadadvantagesinphosphorusutilizationofdifferentformsunderphosphorus—repleteconditions．while肛wesenberg／ishowedadvantagesatlowphosphorusconcentration．M．aer／zg／nosarepresentedthelowestadaptabilitytophosphorusofdifferentforms．Therefore．theadaptabilitytoavailablephosphorusofdifferentformsw∞thecompetitivestrategyforpartofMicrocystismot-phospecies．Keywords：Microcystis；phosphorusfoetus；dissolvedinorganicphosphorus；photosyntheticactivity；lakeTaihu。国家重点基础研究发展计划“973”项目(2008C1M18001．1)资助．2013—03—24收稿；2013—...
