大亚湾夏季浮游群落生产代谢特征及其影响因素*

doi:10.11978/2020149

Abstract

Abstract:

In August 2017, the primary production, community respiration and their metabolic balance status of the planktonic community in Daya Bay were studied, and the potential environmental impact factors and their indicator effects on the function and health of the offshore ecosystem were analyzed. Our results showed that Daya Bay was autotrophic in surface water but heterotrophic in the bottom layer. The gross primary productivity (GPP), community respiration (CR) and net community production (NCP) were 1335±910.12, 597.86±403.30 and 737.50±608.22 mg C·m^-3·d^-1 in surface water and 43.65±37.05, 216.25±147.28 and -160.27±137.01 mg C·m^-3·d^-1 in the bottom, respectively. Overall, Daya Bay was autotrophic with an average NCP of 233.41±248.88 mg C·m^-3·d^-1 in the water column. Size-fractioned result of plankton community metabolism showed that plankton with the cell size of 1-200 μm was the main contributor to GPP and CR in surface water. Correlation analysis and principal component analysis showed that NCP was jointly regulated by GPP and CR in surface water and was positively correlated with phytoplankton biomass as well as nutrient concentration; in the bottom, it was mainly affected by CR and was positively correlated with salinity. The planktonic metabolism balance in Daya Bay during summer varied horizontally and vertically. The regional differences and potential fluctuations of NCP are important indicators of ecosystem stability and health in the bay.

Key words: Primary production, Community respiration, Metabolic balance, Daya Bay

CLC Number:

Q178.53

LI Yao, XIANG Chenhui, JIANG Zhijian, SONG Xingyu. Production and metabolism characteristics of planktonic community and their influencing factors in Daya Bay during summer^*[J].Journal of Tropical Oceanography, 2021, 40(6): 83-92.

Figures/Tables 7

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Tab. 1

Tab. 2

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Fig. 5

References 40

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理化因子	表层		底层
理化因子	范围	均值±方差	范围	均值±方差
pH	7.84~8.49	8.18±0.18	7.75~8.35	8.05±0.17
DO/(mg·L^-1)	7.15~12.72	9.75±1.77	5.03~7.72	6.38±0.83
盐度/‰	15.73~32.16	27.1±5.13	31.5~34.04	32.96±0.95
温度/℃	28.3~30.6	29.78±0.79	25.9~28.7	27.57±0.89
PO3- 4/(μmol·L^-1)	0.04~1.49	0.39±0.51	0.04~0.54	0.2±0.14
SiO2- 3/(μmol·L^-1)	1.03~31.86	11.16±11.81	3.67~23.92	10.71±6.51
DIN/(μmol·L^-1)	1.75~85.1	14.12±23.03	2.78~12.27	4.72±2.41
N/P	6.35~116.31	39.89±31.25	11.16~106.95	31.81±24.5

环境参数	相关性指数
环境参数	表层NCP	表层CR	表层GPP	底层NCP	底层CR	底层GPP
Chl a	0.712**	0.96*	0.901**	-0.678*	0.672*	0.216
pH	-0.338	-0.379	-0.394	-0.127	0.127	0.043
DO	0.279	0.369	0.35	-0.354	0.222	-0.402
盐度	-0.667**	-0.417	-0.631*	0.694**	-0.736**	-0.41
温度	0.241	0.292	0.29	-0.633*	0.661*	0.332
PO3- 4	0.216	0.171	0.22	-0.062	0.009	-0.189
SiO2- 3	0.587*	0.539*	0.631*	-0.021	-0.075	-0.373
DIN	0.678**	0.381	0.622*	0.061	-0.081	-0.099

Production and metabolism characteristics of planktonic community and their influencing factors in Daya Bay during summer^*

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Production and metabolism characteristics of planktonic community and their influencing factors in Daya Bay during summer*

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Production and metabolism characteristics of planktonic community and their influencing factors in Daya Bay during summer^*