摘要
通过2007年1—12月对武汉月湖不同的取样点进行监测,并选择汉江琴台段水域作为研究对照,调查了月湖水体硅藻、蓝藻与水体主要元素的种类,采用PCA、CCA分析法探讨了月湖水体硅藻、蓝藻与水体元素种类的关系。结果表明:月湖水体中所含元素全年监测出28种;汉江琴台段水域中所含元素全年监测出27种。经PCA分析表明,月湖水体中累计贡献率较大为磷(P)、砷(As)、铁(Fe)、铜(Cu)、锰(Mn);汉江琴台段水域累计贡献率较大为硅(Si)、锑(Sb)、镉(Cd)、钒(V)、钡(Ba)、Ag(银)、钼(Mo)。月湖水体中蓝藻密度大于硅藻,汉江琴台段水域硅藻密度大于蓝藻。经CCA分析表明,月湖硅藻密度与硒(Se)、锶(Sr)、银(Ag)、Ba、铝(Al)呈正相关关系;月湖蓝藻密度与P、Cu、铬(Cr)呈正相关关系,月湖蓝藻密度与镁(Mg)、镍(Ni)、钙(Ca)、锌(Zn)、硫(S)呈负相关关系。CCA分析中,汉江琴台段硅藻密度与铅(Pb)、硼(B)、As、Cr、Zn、Al、Cu、Mn、Fe、P呈负相关关系,汉江琴台段硅藻密度与Mo、Ca、钴(Co)、V、Sr、Ag呈正相关关系;汉江琴台段蓝藻密度与钠(Na)、S、Mg、Ni、钾(K)呈负相关关系。月湖水体缺乏可溶硅(dissolved silicon,DSi),硅藻会提升对其他元素(Se、Sr、Ag、Ba、Al)的吸收能力,这些元素会起到缺乏元素(Si)近似的作用,替代性可能出现。水中各种元素的组态是导致月湖浮游植物群落发生演变的重要原因之一。
In comparison with the water in the Qintai reach of the Hanjiang River, the primary elements and community of diatom and cyanobacteria in both the river and the Moon Lake in Wuhan were investigated from January through December 2007 and their relationships were explored by principal component analysis （ PCA ） and canonical correspondence analysis （ CCA ） analysis. The results indicate that 28 kinds of dissolved ions were detected in the Moon Lake and 27 ions in the Qintai reach over the whole-year monitoring. The PCA showed that P, As, Fe, Cu and Mn hold large cumulative contribution rates in the Moon Lake, while Si, Sb, Cd, V, Ba, Ag, and Mo in the Qintai reach. Moreover, the density of cyanobacteria was higher than that of diatom in Moon Lake, while diatom was more abundant than cyanobacteria in the Qintai reach. The CCA showed that the density of diatom in Moon Lake corre- lated positively with Se, Sr, Ag, Ba and A1, and cyanobaeteria correlated positively with P, Cu, Cr and negatively with Mg, Ni, Ca, Zn and S. Using the same method （CCA）, the density of diatom in the Qintai reach correlated negatively with Pb, B, As, Cr, Zn, AI, Cu, Mn, Fe and P and positively with Mo, Ca, Co, V, Sr, Ag, and the cyanobacteria negatively with Na, S, Mg, Ni, and K. The results indicated that Moon Lake lacked in DSi. At the same time, diatom promoted the adsorption capacity of other ions, e.g. Se, Sr, Ag, Ba, and AI, which probably took an alternative role for DSi （ dissolved silicon ）. The combination of various dissolved ions was probably one of main driving forces for the succession of phytoplankton community in the Moon Lake.
出处
《生态环境学报》
CSCD
北大核心
2010年第1期17-22,共6页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(30870221)
国家"十一五"水专项(2009ZX07106-002-004)
湖北省科技攻关重大项目(2006AA305AA03)
武汉市科技攻关项目(200860213022)
关键词
武汉月湖
主要元素
硅藻
蓝藻
主成分分析
典型对应分析
Moon Lake in Wuhan
primary elements
diatom
cyanobacteria
principal component analysis （PCA）
canonical correspondence analysis （ CCA ）
