摘要
在实验室条件下,以3种大型红藻真江蓠(Gracilaria asiatica)、脆江蓠(Gracilaria chouae)和蜈蚣藻(Grateloupiafilicina)为实验材料,研究不同营养盐浓度下这3种海藻对氮、磷的吸收和生长情况。结果表明,3种大型海藻对水体中硝酸盐和磷酸盐的吸收效果明显,并符合一级动力学方程。比较前24 h对氮的平均吸收速率,真江蓠和脆江蓠在50μmol/L组出现最大值,分别为0.739μmol/(g.h)和0.648μmol/(g.h),蜈蚣藻在20μmol/L组出现最大值0.614μmol/(g.h);比较前24 h对磷的吸收速率,真江蓠和脆江蓠在1.0μmol/L组出现最大值,分别为0.015μmol/(g.h)和0.018μmol/(g.h),蜈蚣藻在0.7μmol/L组出现最大值0.016μmol/(g.h)。结合去除速率常数来看,脆江蓠对硝酸盐和磷酸盐有更好的去除效果。营养盐的起始浓度对脆江蓠、真江蓠和蜈蚣藻的生长具有明显的影响。在所有的实验浓度下,8 d后的湿重均为脆江蓠增加最大,蜈蚣藻增加最小;并且改变硝酸盐的浓度比改变磷酸盐的浓度更能刺激蜈蚣藻的生长。
We conducted a series of conditional experiments using Gracilaria asiatica, G. chouae, and Grateloupia filicina to determine the effects of nutrient supply on nitrogen and phosphorus uptake and macroalgae growth. All the three macroalgae responded rapidly to changes in the supply of nitrogen and phosphorus. The uptake curves yielded a first-order kinetic equation. At 50 btmol/L nitrogen, G. asiatica and G. chouae exhibited maximum uptake rates of 0.739μmol/（g.h） and 0.648μmol/（g.h） respectively. At 20μmol/L nitrogen, G. filicina exhibited a maxi- mum uptake rate of 0.614μmol/（g.h）. At a level of 1.0μmol/L phosphorus, G. asiatica and G. chouae exhibited maximum uptake rates of 0.015μmol/（g.h） and 0.018μmol/（g.h）, respectively. At 0.7μmol/L phosphorus, G. filicina exhibited a maximum uptake rate of 0.016 btmol/（g.h）. Our results suggest that G. chouae is more efficient at removing nitrogen and phosphorus than the other two species. The greatest increase in wet weight occurred in G. chouae and the lowest was in G. filicina. Changes in the supply of nitrogen had a stronger influence than changes in phosphorus on the growth of G. filicina.
出处
《中国水产科学》
CAS
CSCD
北大核心
2012年第3期462-470,共9页
Journal of Fishery Sciences of China
基金
国家海洋公益性行业科研专项经费项目(200905019-2
200905020-2)
山东省科技攻关计划项目(2009GG10005012)
关键词
真江蓠
脆江蓠
蜈蚣藻
吸收动力学
相对生长率
Gracilaria asiatica
Gracilaria chouae
Grateloupia filicina
uptake kinetics
relative growth rate
