• 研究报告 •

### 光照和温度对氮饥饿及饱和营养条件下石莼(Ulva lactuca)的硝态氮吸收动力学影响

1. 1南京农业大学资源与环境科学学院江苏省海洋生物学重点实验室,南京 210095;2华南理工大学环境科学与工程学院工业聚集区污染控制与生态修复教育部重点实验室,广州 510006
• 出版日期:2010-05-10 发布日期:2010-05-10

### Effects of temperature and light intensity on the nitrate uptake kinetics of nitrogen starved and replete Ulva lactuca.

CHENG Li-wei1;ZOU Ding-hui2;ZHENG Qing-song1;LIU Zhao-pu1;LI Feng1;JIANG He-ping1

1. 1Key Laboratory of Marine Biology Jiangsu Province, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;2The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Chinese Ministry of Education, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China
• Online:2010-05-10 Published:2010-05-10

Abstract: In order to investigate the nutrient uptake ability of macroalga and to screen efficient biofilter to remedy coastal eutrophication, this paper studied the effects of three levels temperature and light intensity and their interactions on the nitrate uptake kinetics of nitrogen starved and replete Ulva lactuca. Under nitrogen repletion, the maximum nitrate uptake rate of U. lactuca increased with increasing light intensity. At 30 ℃, the maximum uptake rate increased with increasing light intensity, but the Vmax/Km value reached the highest at medium light intensity. The optimal temperature for the nitrate uptake by U. lactuca was 20 ℃, and the nitrate uptake rate was much higher under nitrogen starved condition than under nitrogen replete condition. The nitrate uptake rate of U. lactuca was similar at 10 ℃ and 20 ℃. At 30 ℃, U. lactuca had the highest maximum uptake rate at medium light intensity. The increase of light intensity enhanced the nitrate uptake at 10 ℃ and 20 ℃, but had less effect at 30 ℃. Nitrogen starved U. lactuca had a higher nitrate uptake rate than nitrogen replete U. lactuca. Even under nitrogen replete condition, U. lactuca could still take nitrate from the ambient environment.