悬浮泥沙对亚洲苦草幼苗生长发育的影响  

INFLUENCE OF SUSPENDED SUBSTANCE ON GROWTH OF THE SEEDLINGS OF VALLISNERIA ASIATICA MIKI L.

作　　者：王文林[1] 王国祥[1] 李强[1] 马婷[1] 潘国权[1] 

机构地区：[1]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,南京210097

出　　处：《水生生物学报》2007年第4期460-466,共7页Acta Hydrobiologica Sinica

基　　金：国家"十五"重大科技专项(2003AA601100-2);国家"十五""211工程"重大项目"不同时空尺度环境演变和生态建设"资助

摘　　要：将亚洲苦草(Vallisneria asiatica Miki L.)幼苗植株种植于浊度分别为30NTU、60NTU和90NTU的悬浮泥沙水体中,统计各处理苦草幼苗的生长发育状况,并使用水下饱和脉冲叶绿素荧光仪(DIVING-PAM)测定PSⅡ最大量子产量(FV/Fm)、实际光化学效率(Yield)、光化学荧光淬灭系数(qP)、非光化学荧光淬灭系数(qN)、表观电子传递效率(ETR)以及快速光响应曲线。结果表明,实验第5天,悬浮泥沙对于苦草幼苗的存活、生长发育及光合作用影响不显著(p>0.05),苦草幼苗在低光胁迫下通过增加热耗散以保护PSⅡ。30d后,悬浮泥沙对于苦草幼苗的存活、生长发育及光合作用影响显著(p<0.05),30NTU组苦草幼苗生长发育虽明显受到抑制,但仍能保持一定的存活率;而泥沙浊度为60NTU和90NTU时则完全不利于苦草幼苗存活。30NTU、60NTU、90NTU组的Fv/Fm值、Yield值、qP值、最大ETR均显著低于对照(p<0.05),30NTU组最小饱和光强为176μmol quanta/m2.s,而60NTU、90NTU组则只有17μmolquanta/m2.s,远低于对照组的248μmol quanta/m2.s。The seedlings of Vallisneria asiatica Miki L. were planted in the turbid water with different turbidities of 30NTU, 60NTU and 90NTU which was caused by suspended substance. The growth of the seedlings of VaUisneria asiatica Miki L. in each treatment was investigated. Photosystem Ⅱ（PS Ⅱ） photochemical efficiency （Fv/Fm ratio）, actual photochemical efficiency （Yield）, photochemical quenching （q^P）, non-photochemical quenching （q^N）, electron-transport rate （ETR） and rapid-light curves were measured by submersible, pulse-amplitude modulated （PAM） fluorometer： Diving-PAM. The result showed that in the fifth day, survival , growth and photosynthesis of the seedlings of Vallisneria asiatica Miki L were not influenced markedly （p 〉 0.05）,the seedlings of Vallisneria asiatica Miki L. protected PS Ⅱ by increasing heat dissipating. Survival, growth and photosynthesis of the seedlings of Vallisneria asiatica Miki L were influenced markedly （p 〈 0.05） after 30 days, the growth of the seedlings of VaUisneria asiatica Miki L. in 30NTU treatment was restrained markedly, but it could remain definite survival. However, 60NTU and 90NTU went against the survival of the seedlings of Vallisneria asiatica Miki L. Fv/Fm, Yield, qP, maximum ETR of 30NTU, 60NTU and 90NTU were less than those of the control group markedly （p 〈 0.05）, the minimum saturating irradiance of 30NTU was 176μmol quanta/m^2·s, but 60NTU and 90NTU was only 17μmol quanta/m^2·s, all of these were less than the control group which was 248μmol quanta/m^2·s.

关 键 词：泥沙 苦草幼苗 生长 光合荧光参数 

分 类 号：Q948.11[生物学—植物学]