珠江口羽流锋浮游植物群落对大气沉降的生态响应

doi:10.11978/2019101

Abstract

Abstract:

The Pearl River plume water can form an active plume front along the coastal northern South China Sea. A higher biomass of phytoplankton could exist along the plume front affected by hydrological factors. Atmospheric deposition from land-source input has a significant impact on the ecosystem of the Pearl River Delta zone. A field survey at the western part of the Pearl River Estuary was conducted in March 2019. Substantial variations of size-fractionation phytoplankton community and picoplankton were determined along a section, which affected by the plume front. Meanwhile, atmospheric deposition amendment experiments of three stations, covering different regions of the plume front, were conducted. Results showed that the size-fractionation phytoplankton community was dominated by microphytoplankton at the shore side of the front, picophytoplankton at the sea side of the front, and evenly distributed at the frontal zone with relatively higher biomass. At the frontal zone, the total phytoplankton community was limited by Nitrogen, while the Synechococcus showed a Phosphorus-limitation. Species among the frontal zone could show different nutrients demands. Atmospheric dry or wet deposition could stimulate the growth of three size-fractionation phytoplankton community. The microphytoplankton showed higher growth rate with atmospheric dry or wet amendments at shore side or sea side of the front, while the growth of three size-fractionation phytoplankton community could be stimulated indistinguishably. The addition of atmospheric deposition significantly stimulated the growth of Picoeukaryotes in the frontal system and of Synechococcus at the shore side of the front. Inhibited effects on Synechococcus and Prochlorococcus were found at the frontal zone and sea side of the front.

Key words: plume front, phytoplankton size structure, picoplankton, atmospheric deposition

CLC Number:

P735

Weiwen ZHOU, Qian LI, Zaiming GE, Zijia LIU, Yiping SHUAI, Mengzhen MA. Response of phytoplankton community to atmospheric deposition along Pearl River plume front[J].Journal of Tropical Oceanography, 2020, 39(4): 50-60.

Figures/Tables 10

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样品	营养盐/(μmol·L^-1)		痕量金属/(nmol·L^-1)
样品	DIN	DIP	Al	Cu	As	Cd	Fe	Ni	Co	Cr	Pb	Mn
气溶胶滤液(AP)	6.7	0.13	104	3.6	0.76	0.38	5.0	1.4	0.14	0.25	2.3	12.2
过滤雨水(FRW)	8.3	0.12	105	3.9	2.20	0.03	3.0	1.3	0.05	0.31	1.1	3.4

实验组	添加成分的终浓度
对照组	无添加
+N	4.2μmol·L^-1
+P	0.25μmol·L^-1
+NP	4.2μmol·L^-1(NaNO₃)、0.25μmol·L^-1(NaH₂PO₄)
+AP	4.2mg·L^-1
+FRW	10%(体积比例)

参数		S1		S3			S8
参数		2m	25m	2m	10m	38m	2m	64m
温度/^oC		22.6	22.4	22.9	22.4	22.6	25.1	23.1
盐度/‰		30.3	34.1	32.8	33.5	34.5	34.4	34.5
叶绿素a浓度/(μg·L^-1)		1.0	0.8	1.3	2.7	0.6	0.2	0.8
分粒径浮游植物百分比/%	小型(Micro)	20	38	22	30	43	1	6
	微型(Nano)	38	32	35	53	44	13	25
	微微型(Pico)	42	30	43	17	13	86	69
微微型浮游植物细胞丰度/(×10³mL^-1)	聚球藻Synechococcus	16.3	3.4	119.7	133.5	31.4	21.2	19.0
	原绿球藻Prochlorococcus	—	—	—	—	—	127.2	52.2
	真核浮游植物Picoeukaryotes	5.7	0.9	8.4	12.6	8.0	0.6	3.7

Response of phytoplankton community to atmospheric deposition along Pearl River plume front

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