N and P in waters of the Zhujiang River Estuary in summer

LIN Yi-an; SU Ji-lan; HU Chuan-yu; ZHANG Mei; LI Yan; GUAN Wei-bing; CHEN Jie-chong

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LIN Yi-an, SU Ji-lan, HU Chuan-yu, ZHANG Mei, LI Yan, GUAN Wei-bing, CHEN Jie-chong. N and P in waters of the Zhujiang River Estuary in summer[J]. Haiyang Xuebao, 2004, 26(5): 63-73.

Citation:

LIN Yi-an, SU Ji-lan, HU Chuan-yu, ZHANG Mei, LI Yan, GUAN Wei-bing, CHEN Jie-chong. N and P in waters of the Zhujiang River Estuary in summer[J]. Haiyang Xuebao, 2004, 26(5): 63-73.

LIN Yi-an, SU Ji-lan, HU Chuan-yu, ZHANG Mei, LI Yan, GUAN Wei-bing, CHEN Jie-chong. N and P in waters of the Zhujiang River Estuary in summer[J]. Haiyang Xuebao, 2004, 26(5): 63-73.

Citation:

LIN Yi-an, SU Ji-lan, HU Chuan-yu, ZHANG Mei, LI Yan, GUAN Wei-bing, CHEN Jie-chong. N and P in waters of the Zhujiang River Estuary in summer[J]. Haiyang Xuebao, 2004, 26(5): 63-73.

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N and P in waters of the Zhujiang River Estuary in summer

1.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratorg of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Aministration, Hangzhou 310012, China;Center for Coastal and Atmospheric Research, Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, China
2.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratorg of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Aministration, Hangzhou 310012, China
3.
Center for Coastal and Atmospheric Research, Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, China

Received Date: 2002-08-23
Rev Recd Date: 2003-11-07

Abstract

Abstract

Based on the data obtained by field survey and experiments of the Zhujiang River Estuary during July 17~28,1999,the cycle,regeneration and restriction of N and P in water masses are studied.The results show that there is a large content of N in the Zhujiang River Estuary waters,and it belongs to a high N/P area in the world.With the water mass transported from river to sea,the speciation and concentration of N and P present a violent variation in the waters.Among others,there is new supply on the N,and the supplemental volume may be even larger than the absorbing capacity of plankton photosynthesis somew here.Because of plankton absorbing,migration action of species variation and being intruded and being diluted by the seawater,the concentration of DIN was so constantly reduced and that the N/P was even lower than 16 off the Zhujiang River Estuary.The variation of concentration of PO₄^3- become mirror image each other between the surface layer and the bottom layer water,which indicates that both the directions of biogeochemicalaction of P are contrary.The plankton absorbing is primary process in the surface layer,but the regeneration takes precedence in the middle layer and the bottom layer.Comparatively speaking,one point is the migrationratio of DIN is greater than DIP and the other is the turbidity (or light),P and N are the limit factors of the primary productivity in three areas (from the river gate to the maximum turbidity zone,middle waters of the estuary and off the estuary) respectively.The results of incubation show that the bloom of plankton lead to the considerabl decrease of concentration of DIN,but the concentration of PO₄^3- is in a small scope vibration and keeps a more steady concentration level.It is inferred that the cycle and regeneration of P are more rapid than N,and the regeneration of P can direct supply primary product in euphotic and become a factor bringing to the plankton bloom in the waters,but the reason of the bloom passing away is the DIN being used up in the end.Through contrast study of biogeochemical cycle of N and P,similarities and differences of the process of cycle and regeneration between N and P are explicated,and infer potentiality of the denitrification action in the hypoxia area is inferred.
- nitrogen,
- phosphorus,
- variation of speciation,
- restriction factor,
- Zhujiang River Estuary

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References(24)

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