| 引用本文: | 董彬,陆全平,王国祥,毛丽娜,林海,周锋,魏宏农.菹草(Potamogeton crispus)附着物对水体氮、磷负荷的响应.湖泊科学,2013,25(3):359-365. DOI:10.18307/2013.0308 |
| DONG Bin,LU Quanping,WANG Guoxiang,MAO Lina,LIN Hai,ZHOU Feng,WEI Hongnong.The impact of periphyton attached on Potamogeton crispus on nitrogen and phosphorus loads in water. J. Lake Sci.2013,25(3):359-365. DOI:10.18307/2013.0308 |
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| 菹草(Potamogeton crispus)附着物对水体氮、磷负荷的响应 |
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董彬1,2, 陆全平3, 王国祥1, 毛丽娜1, 林海3, 周锋1, 魏宏农1
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1.南京师范大学地理科学学院, 江苏省环境演变与生态建设重点实验室, 南京 210023;2.临沂大学资源环境学院, 临沂 276000;3.江苏省淡水水产研究所, 南京 210017
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| 摘要: |
| 通过实验模拟了10组氮、磷负荷对菹草(Potamogeton crispus)生长期和衰亡期茎叶附着物的影响.结果显示:随着水体氮、磷浓度的升高,菹草附着物的叶绿素a(Chl.a)含量、附着有机物量、附着无机物量和附着物总量均增加,在氮、磷浓度最高的T10组(总氮12.0 mg/L,总磷1.0 mg/L),附着物的总量达到高峰,附着物的Chl.a含量为2.005~4.765mg/g(DW),附着有机物的量为29.027~94.886 mg/g(DW),附着无机物的量为176.881~397.750 mg/g(DW),附着物总量为205.909~492.636 mg/g(DW).在菹草的快速生长期、稳定期和衰亡期,附着物的Chl.a含量、附着有机物量、附着无机物量和附着物总量均存在显著差异,均表现为衰亡期 >稳定期 >快速生长期,且在各营养盐浓度下均存在这一趋势.菹草衰亡期附着物的Chl.a含量、附着有机物量、附着无机物量和附着物总量分别为稳定期的1.046~1.826、1.046~1.638、1.029~1.858和1.106~1.717倍,为快速生长期的2.324~4.059、2.323~3.640、2.101~3.792和2.280~3.584倍.结果表明水体氮、磷负荷的增加促进了菹草茎叶附着物的生长和积累,加速了沉水植物衰亡. |
| 关键词: 富营养化 氮、磷负荷 沉水植物 附着物 菹草 |
| DOI：10.18307/2013.0308 |
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| 基金项目:国家自然科学基金项目(41173078);江苏省科技厅社会发展支撑项目(BE2009690)联合资助 |
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| The impact of periphyton attached on Potamogeton crispus on nitrogen and phosphorus loads in water |
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DONG Bin1,2, LU Quanping3, WANG Guoxiang1, MAO Lina1, LIN Hai3, ZHOU Feng1, WEI Hongnong1
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1.Jiangsu Key Laboratory of Environmental Change and Ecological Construction, College of Geographical Science, Nanjing Normal University, Nanjing 210023, P.R.China;2.College of Resource and Environment, Linyi University, Linyi 276000, P.R.China;3.Freshwater Fisheries Research Institute of Jiangsu Province, Nanjing 210017, P.R.China
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| Abstract: |
| To explore the role of periphyton in nutrient cycle in eutrophic shallow lake,the effect of the periphyton attached on Potamogeton crispus on nitrogen and phosphorus loads was examined in a mesocosm experiment conducted in controlled greenhouse.A gradient of ten nutrient concentrations (nitrogen concentrations from 3 to 12 mg/L and phosphorus concentrations from 0.1 to 1.0 mg/L) was established with NH4Cl,NaNO3,KH2PO4.The results showed that: The content of periphyton chlorophyll-a (Chl.a),organic matter,inorganic matter and total periphyton increased significantly with nitrogen and phosphorus loads increase.The content of periphyton Chl.a,organic matter,inorganic matter and total periphyton reached peak at T10 (TN 12 mg/L, TP 1.0 mg/L) with Chl.a 2.005-4.765 mg/g(DW) periphyton,organic matter 29.027-94.886 mg/g(DW) Potamogeton crispus, inorganic matter 176.881-397.750 mg/g(DW) Potamogeton crispus,and total periphyton 205.909-492.636 mg/g(DW) Potamogeton crispus,respectively.Periphyton Chl.a,organic matter,inorganic matter and total periphyton generally increased with time.Differences in periphyton Chl.a,organic matter,inorganic matter and total periphyton were significant among growth periods, and showed rapid growth period > stable period > decline period.Moreover,this trend occurred at all nutrient concentrations.The periphyton Chl.a,organic matter,inorganic matter and total periphyton of decline period were 1.046-1.826,1.046-1.638,1.029-1.858 and 1.106-1.717 times those of stable period,and were 2.324-4.059,2.323-3.640,2.101-3.792 and 2.280-3.584 times those of rapid growth period.The results above indicated that the periphyton of Potamogeton crispus and its decline were enhanced by elevated nitrogen and phosphorus loads. |
| Key words: Eutrophication nitrogen and phosphorus loads submerged macrophyte periphyton Potamogeton crispus |
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