摘要
对从太湖分离的铜绿微囊藻(Microcystisaerugionosa)进行了不同氮磷比对生长影响的实验,以探索蓝藻生长优势形成的基础.实验结果虽然在一定程度上符合“氮磷摩尔比低于29蓝藻将会占据优势”的理论,但发现只在较低的营养水平时比较吻合.同时进行了不同磷营养条件下磷营养摄取与生长的实验,为太湖富营养化研究中应用的水质模型提供所需的参数值.微囊藻生长的磷半饱和常数Ks=16.21μM、磷摄取的半饱和常数Km=17.66μM、藻细胞最小的磷份额K=4.36μg/mg(dw);微囊藻在实验条件下的过度储磷系数Q0/Qmax=0.14;测定了磷饥饿和磷丰富时细胞最大的摄磷速率分别为1.66μg/(L·mg·h)和0.06μg/(L·mg·h).可见初始细胞内磷份额较低的藻细胞对磷的吸收速率要比胞内磷份额较高的藻细胞高.
The experiment investigated the relationship of growth characters and phosphorus uptake of Microsystems aerugionosa from Lake Taihu under laboratory conditions. With phosphate and nitrate in oligotrophic level, the growth rate of the alga supported the “N∶P rule”while in hypereutrophic level did not. It is concluded from this study that the “N∶P rule”does not apply to the conditions which P and N were enough. Growth of algae was strongly affected by phosphorus availability. The half saturation constant of P uptake of algae Km was 17.66μM and P half saturation constant for algae growth Ks was16.21μM.The P subsistence quota of algae K=4.36μg /mg(dw). As affected by the initial cellular P quota, the P uptake rates were different. Maximum uptake rate for algae when P is deficient (Vmax,d) was 1.66μg /(L·mg·h) and sufficient maximum P uptake rate (Vmax,s) was 0.06μg/(L·mg·h). P luxury storage coefficient Q0/Qmax=0.14.
出处
《湖泊科学》
EI
CAS
CSCD
2004年第3期252-257,共6页
Journal of Lake Sciences
基金
国家重点基础研究发展计划(2002CB412300)
中国科学院创新项目(KZCX2-311)
中国科学院百人计划项目
南京地理与湖泊研究所所长基金
关键词
太湖
铜绿微囊藻
氮磷比
磷摄取
动力学
Lake Taihu
Microsystems aerugionosa
nitrogen and phosphorus ratios
phosphorus uptake
dynamics
