Studies on primary production and new production of the Zhujiang Estuary, China

CAI Yu-ming; NING Xiu-ren; LIU Zi-lin

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CAI Yu-ming, NING Xiu-ren, LIU Zi-lin. Studies on primary production and new production of the Zhujiang Estuary, China[J]. Haiyang Xuebao, 2002, 24(3): 101-111.

Citation:

CAI Yu-ming, NING Xiu-ren, LIU Zi-lin. Studies on primary production and new production of the Zhujiang Estuary, China[J]. Haiyang Xuebao, 2002, 24(3): 101-111.

CAI Yu-ming, NING Xiu-ren, LIU Zi-lin. Studies on primary production and new production of the Zhujiang Estuary, China[J]. Haiyang Xuebao, 2002, 24(3): 101-111.

Citation:

CAI Yu-ming, NING Xiu-ren, LIU Zi-lin. Studies on primary production and new production of the Zhujiang Estuary, China[J]. Haiyang Xuebao, 2002, 24(3): 101-111.

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Studies on primary production and new production of the Zhujiang Estuary, China

1.
Key Laboratory of Ocean Submarine Geosciences of State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2001-04-11
Rev Recd Date: 2001-08-17

Abstract

Abstract

The distribution of chlorophyll a concentration (Chl a),primary production (PP) and new production (NP) were observed in the estuary of Zhujiang River (the Pearl River) during December.1996 and August.1997.The results show that the average concentration of Chl a,PP and NP in winter and summer are (0.95×0.41) and (1.08×0.52) μg/dm³,(69.2×75.5) and (198.7×119.1) mg/(m²·d),and (1.46×0.79) and (3.05×3.09) mg/(m³·h),respectively.The values are higher in summer than in winter.The average-fratio are 0.45 and 0.38 in winter and summer,respectively.The results of size-fractionated Chl a and PP show that the contribution of nano-and pico-plankton (<20 μm) to total Chl a and PP are in dominant position in phytoplankton community biomass and production.The average contributions to total Chl a are 79.6% and 81.6% in winter and summer,respectively,and to primary production are 70.7% and 89.6%,respectively.There are marked features of spatial zonation characteristics of Chl a and PP in the surveyed area.The highest value of Chl a and potential PP appears in the middle area of the dilution zone and decreases both mouth ward and offshoreward gradually.The high PP appears in the offshore areas.The euphotic production has a good relationship with the composite variable B_eZ_pI₀ (B_e is average euphotic zone Chl a;Z_p euphotic depth;I₀ surface irradiance-PAR),which suggests that light is main limiting factor to the production.The highest value of new production appears in the Jiaoyi Bay during winter and in southwest part of the Lingding Yang during summer.
- estuary of Zhujiang River (Pearl River),
- chlorophyll a,
- pr imary production,
- new production,
- sizefractionation

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References(46)

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