大亚湾浮游植物粒级结构和种类组成对淡澳河河口水加富的响应*

doi:10.11978/2020040

Abstract

Abstract:

Daya Bay is experiencing ecological problems such as eutrophication and frequent algal bloom under the pressure of intense anthropogenic activities. The Dan’ao River is the largest rive entering Daya Bay. We found the concentrations of total dissolved nitrogen and phosphorus at the Dan’ao River estuary reached 85.3 and 1.5 μmol·L^-1, respectively. In situ enrichment experiments were conducted to explore the effect of estuary water from the Dan’ao River on phytoplankton community. Our results showed filtered water (0.2 μm) from the Dan’ao River estuary promoted total Chlorophyll a (Chl a) and phytoplankton abundance, and shifted the dominated Chl a size structure to smaller size (0.7 ~ 20 μm), and also increased the relative abundance of dinoflagellates (Scrippsiella trochoidea and Prorocentrum spp.). The phytoplankton size structure and species composition changed in the same pattern under the addition of dissolved organic nitrogen (DON) of urea. Although combined addition of dissolved inorganic nitrogen and phosphorus increased total Chl a and abundance, the phytoplankton size structure and dinoflagellate abundance did not show significant changes. Our results demonstrate that DON may be the causative nutrient component that leads to miniaturization of the phytoplankton community and promotes the growth of dinoflagellate by comparing the enrichment results of estuary water to N and P nutrient enrichments. These results indicate the significance of DON for eutrophication and harmful algal blooms in Daya Bay, which should be included in management strategies of coastal water eutrophication.

Key words: Daya Bay, Dan’ao River, urea, phytoplankton community, size

CLC Number:

P735.121

XIANG Chenhui, LIU Jiaxing, KE Zhixin, ZHOU Linbin, TAN Yehui. Phytoplankton responses to Dan’ao River estuary water enrichment in terms of size structure and community composition^*[J].Journal of Tropical Oceanography, 2021, 40(2): 49-60.

Figures/Tables 9

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试验名称	组名	加富内容
试验1: 氮、磷营养加富试验	对照组	无
	DON组	氮浓度为14μmol·L^-1的尿素[CO(NH₂)₂]溶液
	DIN组	氮浓度为14μmol·L^-1的NaNO₃溶液
	DIN+DIP组	14μmol·L^-1 NaNO₃溶液+ 1μmol·L^-1NaH₂PO₄溶液
试验2: 河口水加富试验	对照组	无DA
	10% DA组	0.2L DA
	20% DA组	0.4L DA

站位	温度/℃	盐度/‰	TDN浓度/ (μmol·L^-1)	DIN : DON	TDP浓度/ (μmol·L^-1)	DIP : DOP	叶绿素a质量浓度/ (μg·L^-1)	浮游植物丰度/ (个·L^-1)
S10	29.3	30.2	19.5	90 : 10	0.3	31 : 69	3.9	3.4×10⁵
S3	26.6	30.0	85.3	59 : 41	1.5	63 : 37	3.5	5.8×10⁴

组别	DIN浓度/(μmol·L^-1)	DON浓度/(μmol·L^-1)	DIP浓度/(μmol·L^-1)	DOP浓度/(μmol·L^-1)	SiO₃^2-浓度/(μmol·L^-1)
对照	17.6	1.9	0.1	0.2	2.5
DON	17.6	15.9	0.1	0.2	2.5
DIN	31.6	1.9	0.1	0.2	2.5
DIN+DIP	31.6	1.9	1.1	0.2	2.5
10% DA	20.8	5.3	0.2	0.2	4.4
20% DA	24.1	8.6	0.3	0.3	6.4

Phytoplankton responses to Dan’ao River estuary water enrichment in terms of size structure and community composition^*

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Phytoplankton responses to Dan’ao River estuary water enrichment in terms of size structure and community composition*

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Phytoplankton responses to Dan’ao River estuary water enrichment in terms of size structure and community composition^*