当前位置: 首页 > 文章 > 附着藻类对太湖水体中3种氮源的吸收作用 水生态学杂志 2014,35 (1) 63-67
Position: Home > Articles > Uptake of Three Different Nitrogen Forms by Periphytic Algae in Taihu Lake,China Journal of Hydroecology 2014,35 (1) 63-67

附着藻类对太湖水体中3种氮源的吸收作用

作  者:
张强;刘正文
单  位:
中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室;安徽国祯环保节能科技股份有限公司
关键词:
附着藻类;氮吸收;尿素;NH+4;NO-3;太湖
摘  要:
利用15N标记技术,比较了附着藻类对太湖3种氮源(尿素、NH+4和NO-3)的吸收能力。附着藻类对尿素的吸收速率为1.93~5.52μmol/(g·h),对NH+4的吸收速率为0.89~7.67μmol/(g·h),而对NO-3的吸收速率为0.09~0.35μmol/(g·h)。各氮源的贫化百分比在0.18%~9.03%。在浓度为20和50μmol/L时,尿素的贫化值分别为8.41%和8.14%,与NH+4的贫化值相当(分别为9.03%和7.01%);NO-3的贫化值在各浓度下都低于0.29%。附着藻类对每种氮源的吸收速率在3种氮源吸收速率总和中的相对比重:尿素平均为47.9%,NH+4平均为49.6%,NO-3平均为2.5%。根据Vmax与Ks比值,附着藻类对3种氮源的吸收亲和力大小顺序为:尿素>NH+4>NO-3。研究表明,尿素是除NH+4外附着藻类生长可利用的又一重要氮源。
译  名:
Uptake of Three Different Nitrogen Forms by Periphytic Algae in Taihu Lake,China
作  者:
ZHANG Qiang;LIU Zheng-wen;Anhui Guozhen Environmental Protection Science & Technology Co. ,Ltd.;State Key laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences;
关键词:
periphytic algae;;nitrogen uptake;;urea;;ammonium;;nitrate;;Taihu Lake
摘  要:
The uptake ability of periphytic algae to three different nitrogen substrates( urea,NH+ 4and NO-3) was examined using15N tracer techniques in eutrophic Taihu Lake in China. The periphytic algae uptake rates of urea and NH+ 4were 1. 93-5. 52 μmol /( g·h) and 0. 89-7. 67 μmol /( g·h),respectively,accounting for 47. 9% and 49. 6% of the total N uptake rates,which were significantly higher than that of NO-3[0. 09-0. 35 μmol/( g·h) ]accounting for 2. 5% of the total N uptake rates. The depletion rates of each nitrogen source ranged from 0. 18% to 9. 03% in the experiment. At concentrations of 20 μmol / L and 50 μmol / L,the depletion rates of urea were 8. 41% and 8. 14% respectively,9. 03% and 7. 01% for NH+ 4,while both much lower than 0. 29% for NO-3. According to the Vmax: KSratio of periphytic algal uptake kinetics,the sequence of uptake affinity was urea > NH+ 4> NO-3. Our results suggested that the ability to absorb urea gives periphytic algae access to additional nitrogen source in eutrophic lakes.

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