鄱阳湖丰水期氮素分布特征及其与藻类的响应关系
Nitrogen Distribution and Its Influence on the Algae Community of Poyang Lake in the Wet Season
投稿时间:2021-01-29  修订日期:2022-07-11
中文关键词:氮素分布特征  藻类生长  藻类分布  富营养化  鄱阳湖
英文关键词:nitrogen distribution  algae growth  algae distribution  eutrophication  Poyang Lake
基金项目:国家自然科学基金(41663002);江西省青年科学基金(20192BAB213027);江西省水利科技计划项目(201922ZDKT14)
作者单位
李艳红 江西省水利科学院 江西省鄱阳湖水资源与环境重点实验室江西 南昌 330029 
王雪漫 南昌大学 鄱阳湖环境与资源利用教育部重点实验室 资源环境与化工学院江西 南昌330029 
徐珺恺 江西省水利科学院 江西省鄱阳湖水资源与环境重点实验室江西 南昌 330029 
胡春华 南昌大学 鄱阳湖环境与资源利用教育部重点实验室 资源环境与化工学院江西 南昌330029 
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中文摘要:
      为了探讨湖泊富营养化过程中水体氮浓度的时空分布格局及其与藻类的关系,于2017年7月在鄱阳湖主湖区布设45个采样点,对浮游藻类数量和氮素含量进行调查,运用单因素方差分析法和皮尔逊相关系数法对数据进行分析。结果表明,丰水期鄱阳湖主湖区各采样点的总氮、硝酸盐氮、氨氮的平均浓度分别为0.54~1.26、0.06~1.01、0.08~0.30 mg/L,外源输入及环境条件对氮素浓度分布产生了一定影响;藻类数量与氨氮浓度相关性不明显,与总氮、硝酸盐氮浓度表现为显著负相关性,南部湖区的总氮和硝酸盐氮浓度较高,平均浓度为1.10 mg/L和0.75 mg/L,藻类数量较低,均值为1.0×106 个/L;西部湖区的氮素浓度较低,总氮和硝酸盐氮浓度均值为0.59?mg/L和0.18?mg/L,藻类生长最高值为3.5×106 个/L。湖泊中营养型水平占主湖区的44%,富营养型占主湖区的56%,东部湖区、西部湖区是鄱阳湖富营养化风险较高的区域。
英文摘要:
      Nitrogen is one of the primary nutrients for algae growth. Therefore, changes in nitrogen content directly affect the reproduction and growth of algae. In this study, we explored the spatial and temporal distribution pattern of nitrogen levels in Poyang Lake during wet season and analyzed its relationship with algae and the lake eutrophication process, aiming to provide theoretical evidence for controlling the eutrophication of Poyang Lake. A systematic investigation of algae density and nitrogen content in Poyang Lake was carried out at 45 sampling sites in July 2017:Sites 1-12 located in the western area of Poyang Lake; Sites 13-33 located in the southern area of Poyang Lake; Sites 33-45 located in the eastern area of Poyang Lake. One-way ANOVA was used for the significance analysis and the Pearson correlation coefficient method was used to analyze the relationship between water environmental parameters. Results show that total nitrogen, nitrate nitrogen and ammonia nitrogen in the main lake area of Poyang Lake were affected by exogenous inputs and, during the wet season, their concentration ranges were 0.54-1.26, 0.06-1.01, and 0.08-0.30 mg/L, respectively. The spatial distribution of algal density followed the pattern: western area > eastern area > southern area. Algal density was not significantly related to the concentration of ammonia nitrogen, but the negative correlation of algal density with total nitrogen and nitrate nitrogen concentrations was significant. The concentrations of the total nitrogen and nitrate nitrogen in the southern area of Poyang Lake were higher, averaging 1.10 mg/L and 0.75 mg/L, respectively, while algae density was lower, averaging 1.0×106 ind/L. In western Poyang Lake nitrogen levels were lower, with average values for total nitrogen and nitrate nitrogen of 0.59?mg/L and 0.18?mg/L, respectively, while algal density was higher, averaging 3.5×106 ind/L. Based on algae densities, we concluded that 44% of Poyang Lake is mesotrophic, 56% is eutrophic and that the eastern and western areas of the lake are at a high risk of eutrophication.
李艳红,王雪漫,徐珺恺,胡春华.2022.鄱阳湖丰水期氮素分布特征及其与藻类的响应关系[J].水生态学杂志,43(4):16-22.
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