长江流域资源与环境 >> 2011, Vol. 20 >> Issue (4): 451-.

• 生态环境 • 上一篇    下一篇

汉江中下游早春冠盘藻(Stephanodiscus hantzschii)水华暴发过程及其成因初探

殷大聪,郑凌凌,宋立荣   

  1. (1.中国科学院水生生物研究所淡水生态与生物技术国家重点实验室|湖北 武汉 430072;2. 中国科学院研究生院| 北京 100039
  • 出版日期:2011-04-20

STEPHANODISCUS HANTZSCHII BLOOM IN THE HANJIANG RIVER:SPATIOTEMPORAL DISTRIBUTION AND POSSIBLE DRIVING FORCES〖WT〗

YIN Dacong1,2, ZHENG Lingling1, SONG Lirong1   

  1. (1.State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072| China|2.Graduate University of the Chinese Academy of Sciences,Beijing 100039| China
  • Online:2011-04-20

摘要:

近年来汉江中下游早春频繁暴发硅藻水华,为探明汉江早春硅藻水华暴发过程及原因,2010年1月1日~3月6日,对汉江干流及部分支流进行了浮游植物采样调查。结果表明,早春期间汉江干、支流的浮游植物密度分布具有明显的空间差异性:襄樊及以上各个站点浮游植物密度明显低于襄樊以下,汉江干流各个站点的浮游植物密度明显低于入汉江支流——唐白河。1月7日,唐白河站点浮游植物的密度最高,达5050×106个/L,冠盘藻的比例占9609%;从1月27日开始,汉江干流开始出现水华(1442×106个/L),2月23日达到峰值(2466×106个/L),到3月3日,水华开始消退(666×106个/L),前后共持续了1个多月。相关分析表明,汉江早春期间藻体密度与DO(溶解氧)、STN(溶解性总氮)、STP(溶解性总磷)有着极显著的正相关(Pearson (DO),r=063,p<001; Pearson (STN),r=085,p<001;Pearson (STP),r=077,p〖WTBZ〗<001),与SD(透明度)有极显著的负相关关系(Pearson,r=-044,p<001),而与水体中的SSi(溶解性硅)呈显著的负相关(Pearson,〖WTBX〗r=-035,p〖WTBZ〗<005)。依据汉江干、支流优势硅藻密度的时空差异,可以推测,唐白河中高密度的冠盘藻可能是汉江中下游水华暴发的种源之一;同时分析指出,2010年早春汉江中下游干流水华生消与气象因素密切关联

Abstract:

Since 1990s,〖WTBX〗Stephanodiscus hantzschii〖WTBZ〗 bloom occurred frequently in the middledown reaches of the Hanjiang River during the early spring.From January 1st to March 6th 2010,investigaitons were performed to study phytoplankton spatiotemporal distribution in the Hanjiang River basin.During the study period,we found that phytoplankton density at upstream of Xiangfan City were significantly lower than that at downstream,and the density of phytoplankton in mainstream of the Hanjiang River were significantly lower than that of its branch:Tangbai River.On January 7th,the highest density of total phytoplankton reached 5050×106 ind./L,at site of the Tangbai River,of which the 〖WTBX〗Stephanodiscus hantzschii〖WTBZ〗 occupied 9609%.From January 27th,algal bloom appeared in the mainstream,with average phytoplankton density of 1442×106 ind./L,and increased to 2466 ×106 ind./L on February 23,then declined to 66×106 ind./L on March 3rd.Correlation analysis indicated that phytoplankton density had siginificant positive correlations with dissolved oxygen(DO)(Pearson,r=063 p〖WTBZ〗<005),soluble total nitrogen(STN)(Pearson,〖WTBX〗r=085,p<001)and soluble total phosphorus(STP)(Pearson,〖WTBX〗r=077,p〖WTBZ〗<001),but extremely significant negative correlation with water transparence(SD)(Pearson,〖WTBX〗r=- 044,p〖WTBZ〗<001),and significant negative with soluble silicate (SSi)(Pearson,〖WTBX〗r=- 035,p〖WTBZ〗<005).Based on the spatiotemporal pattern of phytoplankton,it was proposed that the higher density of 〖WTBX〗Stephanodiscus hantzschii〖WTBZ〗 in the Tangbai River may serve as a crucial seed bank for the outbreak of 〖WTBX〗Stephanodiscus hantzschii〖WTBZ〗 bloom in the middledown reaches of the Hanjing River.The duration of the earlyspring 〖WTBX〗Stephanodiscus hantzschii〖WTBZ〗 bloom was also significantly influenced by the weather condition of the Hanjiang River basin

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