珠江口浮游植物叶绿素a和初级生产力的季节变化及其影响因素*

doi:10.11978/2016033

Abstract

Abstract:

Based on in situ physical and biological data collected in different seasons between 2014 and 2015, we described systematically the spatial-seasonal characteristics of chlorophyll a (Chl a) and primary production (PP) in the Pearl River Estuary (PRE) and their relationships with environmental factors. The results indicated that the average values of Chl a concentration and PP in the PRE were 3.77 mg·m^-3and 27.86 mg C·m^-3·h^-1, respectively. Both were higher in spring than in the other seasons, and the lowest were in winter. The spatial distribution of phytoplankton was mainly driven by the Pearl River discharge and the phytoplankton bloom was related to the location of salinity front. Due to nutrients limitation in the lower parts of the estuary, the bloom occurred in the upper parts when river discharge was relatively small. In contrast, although the nutrients were favorable for phytoplankton growth during wet season with large river discharge, the bloom was absent in the waters near the outlets likely associated with light limitation and dilution. The distribution of primary production in the PRE was well related to Chl a. The results also suggested that phosphorus was the potential limiting factor for phytoplankton growth in the lower parts of the PRE during wet season and low temperature was another reason for low primary production besides light in winter. Compared with previous results, the primary production was in the intermediate level in PRE during 2014~2015. The mean value of carbon assimilation index (AI) in the PRE was 7.51mg C·(mg Chl a)^-¹·h^-1 and the carbon fixation level was 261.52 g C·m^-2·y^-1.

Key words: chlorophyll a, primary production, carbon assimilation index, Pearl River Estuary

Huajian LIU, Liangmin HUANG, Yehui TAN, Zhixin KE, Jiaxing LIU, Chunyu ZHAO, Junxing WANG. Seasonal variations of chlorophyll a and primary production and their influencing factors in the Pearl River Estuary[J].Journal of Tropical Oceanography, 2017, 36(1): 81-91.

Figures/Tables 11

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References 32

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参数	春季(n = 18)	夏季(n = 18)	秋季(n = 18)	冬季(n = 18)
盐度/‰	21.26 ± 8.82	7.61 ± 5.70	18.40 ± 8.46	25.31 ± 5.68
温度/℃	20.99 ± 1.02	29.60 ± 0.80	25.75 ± 0.55	16.16 ± 0.82
透明度/ m	2.27 ± 1.29	0.93 ± 0.57	2.13 ± 1.17	1.36 ± 0.89
NO₃^--N / (μmol·L^-1)	65.02 ± 36.00	76.69 ± 21.11	62.49 ± 36.47	34.36 ± 30.92
NO₂^--N / (μmol·L^-1)	5.48 ± 3.75	13.79 ± 5.73	7.68 ± 4.31	4.23 ± 4.16
NH₄⁺-N/ (μmol·L^-1)	8.45 ± 7.09	1.02 ± 1.09	3.04 ± 1.36	18.10 ± 18.18
DIN / (μmol·L^-1)	78.96 ± 44.40	91.51 ± 25.00	73.20 ± 37.70	56.68 ± 51.67
PO₄^3--P / (μmol·L^-1)	0.30 ± 0.19	0.72 ± 0.62	0.98 ± 0.28	0.62 ± 0.39
SiO₃^2--Si / (μmol·L^-1)	29.98 ± 19.31	86.72 ± 36.04	98.57 ± 38.20	30.54 ± 24.68
N:P	301 ± 183	162 ± 135^a	71 ± 32	84 ± 52

海区	春季	夏季	秋季	冬季	年平均
内伶仃洋	4.77 ± 0.65	5.55 ± 2.81	6.05 ± 2.75	4.59 ± 2.80	5.16 ± 2.15
外伶仃洋	11.79 ± 4.13	11.72 ± 2.37	6.31	4.17 ± 3.40	8.88 ± 5.20
珠江口外	10.70 ± 2.69	8.74 ± 3.05	7.61 ± 2.41	3.32 ± 1.26	8.37 ± 3.67
海区平均	9.65 ± 4.22 ^a	8.06 ± 3.51 ^b	6.75 ± 2.26 ^c	4.04 ± 2.55 ^d	7.51 ± 4.09

季节	参数	盐度	温度	透明度	硝酸盐	DIN	硅酸盐	磷酸盐	氮磷比
春季	Chl a	-0.059	-0.148	-0.353	0.261	0.144	0.131	-0.514*	0.791**
春季	PP	0.225	0.081	-0.259	0.058	-0.054	-0.078	-0.582*	0.750**
夏季	IPP	0.793**	-0.318	0.851**	-0.308	-0.231	-0.750*	-0.338	0.654
秋季	PP	0.768*	0.723	0.684	-0.719	-0.696	-0.784*	-0.602	-0.638
秋季	IPP	0.926**	0.678	0.995**	-0.866*	-0.873*	-0.905**	-0.960**	-0.836*
冬季	Chl a	-0.484*	-0.155	-0.092	0.488*	0.402	0.382	0.145	0.464

时间	海区	IPP/ (mg C·m^-2·d^-1)	参考文献
1987—1993年	虎门至桂山岛	309 (夏86, 冬609)	黄良民等, 1997
1996—1997年	虎门上游至万山	685 (夏286, 冬1083)	黄邦钦等, 2005
1996—1997年	虎门上游至近海	134 (夏198, 冬69)	蔡昱明等, 2002
1999年7月	虎门至万山	100~400	Yin et al, 2004b
2006年	香港附近	~1300	Ho et al, 2010
2012年6月	珠江口	~500	Ye et al, 2015
2014—2015年 ^a	虎门至万山	431	本研究
2014—2015年 ^b	虎门至万山	716	本研究

Seasonal variations of chlorophyll a and primary production and their influencing factors in the Pearl River Estuary

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