A 2011 drought event affecting distribution of nutrients and chlorophyll in the Zhujiang River estuary

Zhen Shi; Xiaoping Huang; Xia Zhang; Feng Ye; Ximei Liang; Zhixin Ni; Weixu Cai

doi:10.1007/s00343-014-3074-x

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A 2011 drought event affecting distribution of nutrients and chlorophyll in the Zhujiang River estuary

Updated：2023-05-16

- A 2011 drought event affecting distribution of nutrients and chlorophyll in the Zhujiang River estuary
- Journal of Oceanology and Limnology Vol. 32, Issue 2, Pages: 433-443(2014)
- Affiliations：
  
  1. Key Laboratory of Tropical Marine Bio-Resources and Ecology South China Sea Institute of Oceanology Chinese Academy of Sciences
  2. State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences
  3. University of Chinese Academy of Sciences
  4. Key Laboratory of Marginal Sea Geology Guangzhou Institute of Geochemistry Chinese Academy of Sciences
  5. South China Sea Environmental Monitoring Center of State Oceanic Administration
- Author bio：
- Funds：
- DOI：10.1007/s00343-014-3074-x
  CLC：
- Online First：06 March 2014，
  
  Published：2014
- Accepted：
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Shi, Z., Huang, X., Zhang, X. et al. A 2011 drought event affecting distribution of nutrients and chlorophyll in the Zhujiang River estuary., Chin. J. Ocean. Limnol. 32, 433–443 (2014). https://doi.org/10.1007/s00343-014-3074-x
DOI：

Shi, Z., Huang, X., Zhang, X. et al. A 2011 drought event affecting distribution of nutrients and chlorophyll in the Zhujiang River estuary., Chin. J. Ocean. Limnol. 32, 433–443 (2014). https://doi.org/10.1007/s00343-014-3074-x DOI：

摘要

Abstract

During the summer of 2011

a severe drought event occurred throughout the Zhujiang (Pearl) River Basin of South China. This decreased runoff into the river

resulting in increased salinity and reduced suspended substance. To examine the effects of this extreme drought on the distribution of nutrients and chlorophyll

we compared two surveys from 2006 and 2011. Results show that dissolved inorganic nitrogen concentration did not change from 2006 to 2011

whereas the proportions of NO 2 − and NH 4 + to DIN in 2011 increased. PO 4 3− concentration was lower in 2011 than in 2006

whereas there was no difference in SiO 3 2− concentration between these years. Correlation coefficients of salinity with levels of NO 3 −

NO 2 −

NH 4 +

PO 4 3− and SiO 3 2− in 2011 were all much higher than those in 2006

suggesting greater conservation of dissolved nutrients during the extreme drought event. Furthermore

calculated amounts of regenerated nitrate and phosphorus and their proportions to observed nutrients in 2011 were much lower than in 2006

indicating that nutrient regeneration decreased during the extreme drought period. Mean concentration of chlorophyll a (Chl-a) was considerably higher in 2011 than in 2006

and a harmful algal bloom of Cochlodinium geminatum was observed in the estuary

owing to water stagnancy and lower turbidity as a consequence of drought. Therefore

the extreme drought event in 2011 changed the composition ratio of nutrients

enhanced nutrient conservative behavior

and reduced nutrient regeneration. This affected some key ecological processes in the estuary.

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