Long-term ecological interactions between nutrient and phytoplankton community in the Changjiang estuary

Tao Jiang; Zhiming Yu; Xiuxian Song; Xihua Cao; Yongquan Yuan

doi:10.1007/s00343-010-9059-5

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Long-term ecological interactions between nutrient and phytoplankton community in the Changjiang estuary

OriginalPaper | Updated：2023-05-16

- Long-term ecological interactions between nutrient and phytoplankton community in the Changjiang estuary
- Long-term ecological interactions between nutrient and phytoplankton community in the Changjiang estuary
- 海洋湖沼学报（英文） 2010年28卷第4期页码：887-898
- Affiliations：
  
  1. Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences
  2. Graduate University of the Chinese Academy of Sciences
- Author bio：
- Funds：
  
  Supported by the National Natural Science Foundation of China for Creative Research Groups (No. 40821004), the High Technology Research and Development Program of China (863 Program) (No. 2008AA09Z107), and the National Basic Research Program of China (973 Program) (No. 2010CB428706))
- DOI：10.1007/s00343-010-9059-5
  中图分类号：
- 网络首发：2010-06-29，
  
  纸质出版：2010
- Accepted：
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Long-term ecological interactions between nutrient and phytoplankton community in the Changjiang estuary[J]. 海洋湖沼学报（英文）, 2010,28(4):887-898.

Jiang, T., Yu, Z., Song, X. et al. Long-term ecological interactions between nutrient and phytoplankton community in the Changjiang estuary., Chin. J. Ocean. Limnol. 28, 887–898 (2010). https://doi.org/10.1007/s00343-010-9059-5
Long-term ecological interactions between nutrient and phytoplankton community in the Changjiang estuary[J]. 海洋湖沼学报（英文）, 2010,28(4):887-898. DOI： 10.1007/s00343-010-9059-5.

Jiang, T., Yu, Z., Song, X. et al. Long-term ecological interactions between nutrient and phytoplankton community in the Changjiang estuary., Chin. J. Ocean. Limnol. 28, 887–898 (2010). https://doi.org/10.1007/s00343-010-9059-5 DOI：

摘要

Abstract

Both nitrate (NO 3 − ) and soluble reactive phosphate (PO 4 3− ) concentration in the freshwater end-member at the mouth of the Changjiang River have increased dramatically since the 1960s. Within the same period in the sea area

with surface salinity>30

NO 3 − concentration has shown an obvious increase

PO 4 3− has not changed greatly and dissolved reactive silica (SiO 3 2− ) has deceased dramatically. An examination of the elemental ratio of NO 3 − to PO 4 3− at the mouth of the Changjiang River did not show a systematic trend from the 1960s to 2000s largely because both nutrients increased simultaneously. In comparison

the elemental ratio of dissolved inorganic nitrogen (DIN) to PO 4 3− in surface seawater

with salinity>22

has shown a clearly increasing trend. Furthermore

an overall historical change of the SiO 3 2− :PO 4 3− ratio has undergone a reverse trend in this area. Based on the changes of SiO 3 2− :PO 4 3− and DIN:PO 4 3− ratios

we can conclude that an overall historical change of SiO 3 2− :DIN ratio has decreased in this area from the 1950–1960s to 2000s. The argument that phytoplankton productivity in the Changjiang estuary has been enhanced by increasing nutrient input from the riverine transport was supported by these results. A comparative study analyzing the shift of phytoplankton composition from the mid-1980s to 2000s was also made. The results indicated that the average yearly percentage of diatom species in the Changjiang estuary has decreased from 84.6% during 1985–1986 to 69.8% during 2004–2005. Furthermore

the average yearly percentage of diatom abundance in the Changjiang estuary decreased from 99.5% during to 75.5% over the same time period

while the abundance of dinoflagellates has increased dramatically

from 0.7% to 25.4%.

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Keywords

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