Dynamics of inorganic nutrient species in the Bohai seawaters

Zhang, Ji Ping; Yu, Zhigang; Raabe, Thomas; Liu, S.M; Starke, Andreas; Zou, Li; Gao, Huiwang; Brockmann, U. H.

doi:10.1016/j.jmarsys.2003.09.010

Cited by 110 publications

(68 citation statements)

References 33 publications

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“…In recent years, the ecological environments of the Bohai Sea and the Yellow Sea have changed dramatically under dual influences of human activities and natural environmental factors (Pan and Wang, 2012; Gao et al, 2014a,b); especially in the water column of the Bohai Sea, P concentration displayed a decreasing tendency (Zhang et al, 2004;Liu et al, 2004a;Wang et al, 2009;Liu et al, 2011a). Xia et al (2009) E-mail address: xlgao@yic.ac.cn (X. Gao).…”

Section: Introductionmentioning

confidence: 99%

Geochemical characteristics of phosphorus in surface sediments of two major Chinese mariculture areas: The Laizhou Bay and the coastal waters of the Zhangzi Island

Zhuang¹,

Gao²,

Zhang³

et al. 2014

Marine Pollution Bulletin

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a b s t r a c tPhosphorus (P) in surface sediments of the Laizhou Bay (LB) and the coastal waters around the Zhangzi Island (ZI) was analyzed. Six forms of P were separated -exchangeable or loosely sorbed P (Ads-P), aluminum-bound P (Al-P), iron-bound P (Fe-P), authigenic apatite plus CaCO 3 -bound P plus biogenic apatite (Ca-P), detrital apatite plus other inorganic P (De-P) and organic P (OP). The average contents of P in the LB were in the order: De-P > OP > Ca-P > Fe-P > Ads-P > Al-P; in the ZI, the corresponding order was De-P > OP > Fe-P > Ca-P > Ads-P > Al-P. Due to the high nutrient loadings from the surrounding rivers, TP contents in sediments of the LB were higher than in those of the ZI. The potential bio-available P (Ads-P and OP) accounted for 14.7% and 24.2% of TP in sediments of the LB and the ZI, respectively.Ó 2014 Elsevier Ltd. All rights reserved.As an important biogenic element in the ocean, phosphorus (P) directly affects the primary productivity of the ocean and has a significant impact on the marine carbon cycle (Lui and Chen, 2011;Yu et al., 2012); P is also directly related to the global climate and environmental changes (Krom et al., 2004). Hecky and Kilham (1988) pointed out that P might be the element which controlled the global marine biological productivity during a long geologic time scale (>1000 years). As an important reservoir of P in marine environment, sediment not only has a buffering effect on the P content in the overlying water, but also is an important source of P in seawater (Giblin et al., 1997;Zabel et al., 1998). Fisher et al. (1982) reported that sediments provided 28-35% of P needed in the primary productivity of coastal marine ecosystems.Both organic and inorganic forms of P are present in marine sediments. Inorganic forms of P may be adsorbed onto the surfaces of minerals, or be bound to aluminum, iron, or calcium (Föllmi, 1996;Benitez-Nelson, 2000;Łukawska-Matuszewska and Bolałek, 2008;Song, 2010). The binding forms of P in sediments have major influences on transportation, degradation, and the ultimate fate of P in marine ecosystems. Only certain forms of P can be transformed into bio-available ones after being affected by physical, chemical and biological factors, including desorption, dissolution and reduction processes (Song, 2010). After that, the bio-available forms of P are released into the overlying water. These certain forms of P become important factors affecting the trophic status of water or causing eutrophication (Eijsink et al., 2000). Therefore, research on the geochemical forms of P in sediments may help researchers understand the dynamic cycle of P in seawater and sediments, such as migration and transformation between sediments and the overlying water, and subsequent diagenesis and other geochemical processes (Zabel et al., 1998;Eijsink et al., 2000).The Laizhou Bay and the surrounding marine area of the Zhangzi Island (hereafter referred to as the Zhangzi Island for short) are important mariculture zones in China, and they are located in the B...

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Section: Introductionmentioning

confidence: 99%

Geochemical characteristics of phosphorus in surface sediments of two major Chinese mariculture areas: The Laizhou Bay and the coastal waters of the Zhangzi Island

Zhuang¹,

Gao²,

Zhang³

et al. 2014

Marine Pollution Bulletin

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“…Although the silicate stock has decreased a lot since late 1950s, it is still high enough to avoid from becoming the limiting nutrient (Cui et al, 1991;Zhang et al, 2004). Therefore, we did not take it into account in the present modeling.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, Figure 3 also shows that Yellow River accounts for more than 60% freshwater inputs to BS. Zhang et al (2004), and data in the other two columns are adapted to the nutrient enrichment experiments. In the nitrogen enrichment experiment, the concentration of river-borne nitrogen was set to be 1.5 times that of the standard case, whereas in the phosphorus enrichment experiment, the Figure 3 8 concentration of riverine phosphate is set to be about one order higher than that in ambient seawaters.…”

Section: Model Descriptionmentioning

confidence: 99%

“…In the nitrogen enrichment experiment, the concentration of river-borne nitrogen was set to be 1.5 times that of the standard case, whereas in the phosphorus enrichment experiment, the Figure 3 8 concentration of riverine phosphate is set to be about one order higher than that in ambient seawaters. Sediment release is another external nutrient source for the BS ecosystem, and the sediment-water nutrient flux was estimated by Zhang et al (2004).…”

Section: Model Descriptionmentioning

confidence: 99%

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Numerical investigation of nutrient limitations in the Bohai Sea

Liu

Yin

2010

Marine Environmental Research

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River discharges are the important freshwater and nutrient sources for Bohai Sea (BS), and have a profound impact on the local marine environment. In this paper, the annual cycles of nutrient and phytoplankton dynamics in 1980s were reproduced using a coupled biogeochemical-physical model. Based on the validated simulations, the nutrient limitation characters were further investigated by running the model with the riverine nutrient altered, first enriching nitrogen and then phosphorus. It was found that although the riveine N:P ratios in Yellow and Haihe Rivers were much higher than the Redfield number, the nitrogen enrichment was still able to enhance the algae bloom in Laizhou and Bohai Bays. On the other hand, the response of algae growth to phosphorus enrichment was not thus obvious, which suggests the local phytoplankton dynamics was 2 characterized by the nitrogen limitation. Simulations also show that the nitrogen enrichment is generally accompanied by the phosphorus consumption, so a shift from nitrogen limitation to phosphorus limitation may occur if such a trend continues.

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“…Since the rapid urbanization and population growth in Tianjin municipality, NO − 3 loading has progressively increased in rivers and estuaries associated with human activities such as agricultural runoff: untreated domestic and industrial wastewater (Gao et al, 2011). Furthermore, port construction and reclamation projects along the coastline of the municipality aggravate NO − 3 pollution (Zhang et al, 2004). Thus, tracing NO − 3 sources and assessing NO − 3 dynamics in the salinized rivers and estuaries represent fundamental goals in this study.…”

Section: Introductionmentioning

confidence: 99%

Nitrate sources and dynamics in a salinized river and estuary – a δ15N–NO3− and δ18O–NO3− isotope approach

2014

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Dynamics of inorganic nutrient species in the Bohai seawaters

Cited by 110 publications

References 33 publications

Geochemical characteristics of phosphorus in surface sediments of two major Chinese mariculture areas: The Laizhou Bay and the coastal waters of the Zhangzi Island

Geochemical characteristics of phosphorus in surface sediments of two major Chinese mariculture areas: The Laizhou Bay and the coastal waters of the Zhangzi Island

Numerical investigation of nutrient limitations in the Bohai Sea

Nitrate sources and dynamics in a salinized river and estuary – a δ<sup>15</sup>N–NO<sub>3</sub><sup>−</sup> and δ<sup>18</sup>O–NO<sub>3</sub><sup>−</sup> isotope approach

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Dynamics of inorganic nutrient species in the Bohai seawaters

Cited by 110 publications

References 33 publications

Geochemical characteristics of phosphorus in surface sediments of two major Chinese mariculture areas: The Laizhou Bay and the coastal waters of the Zhangzi Island

Geochemical characteristics of phosphorus in surface sediments of two major Chinese mariculture areas: The Laizhou Bay and the coastal waters of the Zhangzi Island

Numerical investigation of nutrient limitations in the Bohai Sea

Nitrate sources and dynamics in a salinized river and estuary – a δ&lt;sup&gt;15&lt;/sup&gt;N–NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;−&lt;/sup&gt; and δ&lt;sup&gt;18&lt;/sup&gt;O–NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;−&lt;/sup&gt; isotope approach

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Nitrate sources and dynamics in a salinized river and estuary – a δ<sup>15</sup>N–NO<sub>3</sub><sup>−</sup> and δ<sup>18</sup>O–NO<sub>3</sub><sup>−</sup> isotope approach