| 3种沉水植物碳氮代谢对水体氮源形态组成的响应 |
| Metabolic Characteristics of Three Submerged Macrophytes Exposed to Different NH4+-N/NO3--N Ratios in Eutrophic Water |
| 投稿时间：2016-03-22 修订日期：2017-03-25 |
| DOI：10.15928/j.1674-3075.2017.02.008 |
| 中文关键词:沉水植物 氨氮/硝氮 碳氮代谢 富营养化 |
| 英文关键词:submerged plants NH4+-N /NO3--N ratio C-N metabolism eutrophication |
| 基金项目:国家自然科学基金面上项目（青年基金）（31000161）；湖北工业大学博士启动基金（337223） |
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| 中文摘要: |
| 在总氮浓度为2mg/L的条件下，以穗花狐尾藻（Myriophyllum spicatum L.）、伊乐藻（Elodeacanadensis Michx）和金鱼藻（Ceratophyllumdemersum Linn) 3种沉水植物为试验对象，研究水体中不同硝态氮和铵态氮浓度之比对植物碳氮（C-N）代谢的影响。结果表明：（1）与对照相比，氨氮添加显著提高了3种植物组织内游离氨基酸（FAA）的含量，且在氨氮浓度2mg/L时FAA达最大；（2）植物体内可溶性糖含量（SC）存在显著的种间差异，二元方差分析显示处理间SC的差异，种间差异的贡献值为69%；（3）硝态氮完全替代氨态氮时，3种植物组织中的SC/FAA显著升高，二元方差分析显示处理间SC/FAA的差异主要源于氮源形态组成（56%）；（4）伊乐藻体内FAA和SC含量均大于穗花狐尾藻和金鱼藻。这可能是它在富营养水体中更有优势的重要原因之一。 |
| 英文摘要: |
| It is known that C-N metabolism in aquatic plants is depressed by high NH4+-N concentrations in eutrophic water. The ratio of soluble carbohydrate to free amino acid (SC/FAA) can be used to index NH4+-N stress on C-N metabolism in aquatic plants. In this study, the C-N metabolic characteristics of three submerged plants ( Myriophyllum spicatum L., Elodea canadensis Michx and Ceratophyllum demersum Linn) grown under different ratios of NH4+-N -N: NO3--N, with a total dissolved inorganic nitrogen of 2mg/L (meets Class V water standard) were investigated. The growth rate and levels of FAA and SC of the three aquatic plants were compared to better understand the influence of the NH4+-N: NO3--N ratio on aquatic plant metabolism. Five treatments with varying NH4+-N: NO3--N ratios (adjusted with NH4Cl and KNO3) and one control group were set, with each group run in triplicate. The treatments were as follows: Control, no added NH4+-N or NO3--N; (1) NH4+-N: NO3--N =2:1; (2) NH4+-N: NO3--N =1:1; (3) NH4+-N: NO3--N =1:2; (4) NH4+-N only, no NO3--N; (5) NO3--N only, no added NH4+-N. The presence of NH4+-N significantly increased FAA content in all three plants and the FAA content increased with NH4+-N to a minimum of 2 mg/L, the highest treatment level in this study. In the control and the first three treatments, the SC content of the three species were significantly different and two-way ANOVA revealed that interspecific differences accounted for 69% of the observed difference in SC content. When no NH4+-N was added (only NO3--N present), the SC/FAA ratio in all three species increased significantly and ANOVA indicated that the NH4+-N: NO3--N ratio contributed 56% to the difference. In addition, E. Canadensis Michx had a higher FAA and SC content than the other two species, which helps explain its growth advantage in eutrophic water bodies. |
| 章伟,王和云,赵以军.2017.3种沉水植物碳氮代谢对水体氮源形态组成的响应[J].水生态学杂志,38(2):51-56. |
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