华东师范大学学报（自然科学版） ›› 2021, Vol. 2021 ›› Issue (2): 63-72.doi: 10.3969/j.issn.1000-5641.2021.02.007

• 河口海岸学 • 上一篇    下一篇

长江流域水库叶绿素及营养盐变化: 生物过滤器效应

同萌1, 李茂田1,2,*(), 牛淑杰1, 刘晓强1, 林沐东1, 郭慧婷1, 候立军1   

  1. 1. 华东师范大学 河口海岸学国家重点实验室, 上海　200241
    2. 崇明生态研究院, 上海　202162
  • 收稿日期:2019-11-19 出版日期:2021-03-25 发布日期:2021-04-01
  • 通讯作者: 李茂田 E-mail:mtli@sklec.ecnu.edu.cn
  • 基金资助:
    国家自然科学基金(41671007); 国家重点研发项目(2016YFA0600904, 2016YFE0133700);中央高校基本科研专项资金

Changes in chlorophyll and nutrients in reservoirs of the Changjiang River basin: The “biological filter” effect

Meng TONG1, Maotian LI1,2,*(), Shujie NIU1, Xiaoqiang LIU1, Mudong LIN1, Huiting GUO1, Lijun HOU1   

  1. 1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai　200241, China
    2. Institute of Eco-Chongming, Shanghai　202162, China
  • Received:2019-11-19 Online:2021-03-25 Published:2021-04-01
  • Contact: Maotian LI E-mail:mtli@sklec.ecnu.edu.cn

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摘要：

选取对上游来水滞留时间不同的4个典型水库, 利用藻类和营养盐调查资料, 分析水库的“生物过滤器”效应. 发现: ① 垂向上各水库Chl.a浓度均出现次表层最大, 然后向下逐渐减少的趋势, 导致营养盐浓度形成“上层小下层大”的生物滞留特征, 4个水库的DIN(NO2-N、NH4-N、NO3-N)、DIP(PO4-P)和DSi(SiO3-Si)垂向滞留量平均值分别为下层浓度的6.29%、14.92%和8.60%. ② 沿程上各水库Chl.a浓度和藻类生物量从上游向下游总体呈减小趋势, 导致营养盐浓度形成“上游大下游小”的生物滞留特征, 4个水库DIN、DIP和DSi沿程滞留量平均值分别为上游浓度的26.53%、39.89%和31.70%. ③ 4个水库DIN、DIP和DSi综合滞留量的平均值分别为原浓度的32.82%、54.80%和40.30%. ④ 随水库滞留时间增加, DIP浓度逐渐减少直至小于0.1 μmol/L, 以致磷成为藻类生长的绝对限制条件.

关键词: 水库, 叶绿素次表层最大, 营养盐滞留, 生物过滤器

Abstract:

The biological filtering effect of reservoirs has become an area of focus for environmental science. We conducted an in situ survey, with different upstream retention times, of chlorophyll-a (Chl.a) and nutrients at the Zhexi, Zhelin, Hualiangting, and Yahekou reservoirs. We found that: ① In the vertical direction, Chl.a in each reservoir had the largest subsurface layer and generally decreased downward, resulting in upper nutrients assimilated by algae and an average vertical retention rate of DIN, DIP, and DSi of the reservoirs at 6.29%, 14.92%, and 8.60%, respectively. ② The concentration of Chl.a and the biomass of phytoplankton generally decreased from upstream to downstream, resulting in lots of nutrients assimilated by algae upstream, and the average horizontal retention rate of DIN, DIP, and DSi of the reservoirs at 26.53%, 39.89%, and 31.70%, respectively. ③ The total average retention rate of DIN, DIP, and DSi of the four reservoirs were 32.82%, 54.80%, and 40.30%, respectively. ④ The concentration of DIP decreased gradually with increases in the reservoir’s retention time; in fact, the concentration of DIP even decreased to 0.1 μmol/L, i.e. the growth of phytoplankton was fully limited by DIP.

Key words: reservoir, subsurface chlorophyll maximum, nutrient retention, biological filtering

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