Compound effect of land reclamation and land-based pollutant input on water quality in Qinzhou Bay, China

Lyu, He; Song, Dehai; Zhang, Shaofeng; Wen, Wu; Bao, Xianwen

doi:10.1016/j.scitotenv.2022.154183

Cited by 16 publications

(13 citation statements)

References 48 publications

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“…Higher nutrient concentrations were also observed in the other coastal bays of Beibu Gulf during the rainy seasons (Lai et al, 2014;Lao et al, 2021a andLao et al, 2021c), which were mainly related to the heavy land-source discharge induced by the increasing runoff around the coastal Beibu Gulf (Lao et al, 2020;Lao et al, 2021a). Particularly in Qinzhou Bay, because there are several rivers, such as the Qin River, Maoling River and Dafeng River, that directly input a large amount of terrestrial contaminants into the bay (Chen et al, 2019a;Zhang et al, 2019;Lao et al, 2020;Lao et al, 2021c;Lao et al, 2022b;Lyu et al, 2022). However, heavier DIN pollution was found in Xi Bay.…”

Section: Characteristics Of Nutrients In XI Baymentioning

confidence: 99%

Sources of nitrate in a heavily nitrogen pollution bay in Beibu Gulf, as identified using stable isotopes

et al. 2022

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Eutrophication, mainly caused by the oversupply of inorganic nitrogen and phosphate, has increased and become a serious environmental problem in the coastal bays of Beibu Gulf, a newly developing industry and port in South China. However, the sources of nitrate are poorly understood in the gulf. In this study, nitrate dual isotopes (δ15N-NO3- and δ18O-NO3-) and ammonium isotopes (δ15N-NH4+) were measured during the rainy season to identify the nitrate sources and elucidate their biogeochemical processes in Xi Bay, a semi-enclosed bay that is strongly affected by human activities in the Beibu Gulf. The results showed that a high dissolved inorganic nitrogen (DIN, 10.24-99.09 µmol L-1) was observed in Xi Bay, particularly in the bay mouth. The concentrations of DIN in the bay were 1.5 times higher than that in Qinzhou Bay and 1.7 times than that in Tieshangang Bay, which mainly influenced by the intensive human activities (i.e., industrial and port activities). In addition, lower values of δ15N-NO3- and δ18O-NO3- and higher values of δ15N-NH4+ were observed in the upper bay, suggesting that microbial nitrification occurs in the upper bay, which was the dominant nitrate source in the upper bay (39%). In addition to nitrification, external sources, including sewage and manure (33%), soil N (15%) and fertilizer (11%), contributed to the higher nutrients in the upper bay. In the lower bay, severe nitrogen pollution led to a weaker impact of biological processes on isotopic fractionation, although a high Chl a level (average of 7.47 µg L-1) was found in this region. The heavy nitrate pollution in the lower bay mainly originated from sewage and manure (54%), followed by soil N (26%) and fertilizer (17%). The contribution of the nitrate source from atmospheric deposition was relatively low in the bay (<3%). This study suggests that biogeochemical processes have little impact on nitrate dual isotopes under heavy nitrogen pollution, and isotopes are an ideal proxy for tracing nitrogen sources.

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Section: Characteristics Of Nutrients In XI Baymentioning

confidence: 99%

Sources of nitrate in a heavily nitrogen pollution bay in Beibu Gulf, as identified using stable isotopes

et al. 2022

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“…The coastal regions are the center of economic activities in most countries due to their proximity to the seas, which aids overseas trade (WRI, 2001). They serve as the link between the sea and the land, facilitating the international trading of goods, resources, and energy (Lyu et al, 2022). As a result, neighboring residents in search of employment and success move to the coastal areas, making these regions densely populated.…”

Section: Introductionmentioning

confidence: 99%

“…Land reclamation is one of the factors that affect the overall quality of the environment. Their actual effects on aquatic ecosystems are poorly understood, making it di cult to understand their impacts (Lyu et al, 2022). Studies have indicated that the effects of land reclamation include the formation of new habitat for some species as well as the permanent loss of protected areas, loss of biodiversity, severe adverse effects on water quality, sediment structure, and benthos creatures (OSPAR Commission, 2008;Cheng et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Assessing the impact of anthropogenic stressors on water quality, sediment characteristics and benthic macroinvertebrates community in a Coastal Lagoon, Southwest Nigeria

Adesakin

Ehikhamele

Ogunrinola

et al. 2023

Preprint

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The aim of this study was to investigate the impact of anthropogenic stressors on environmental variables, sediment properties and benthic macroinvertebrate assemblages of Lagos Lagoon. Four sampling stations were established with respect to their importance/ anthropogenic activities within Lagos Lagoon. Surface water, bottom substrates and benthic macroinvertebrate fauna samples were collected at all sampling stations for a year while samples were analyzed using appropriate standard methods and procedures. The highest pH ranged of 7.96–8.01 (7.98 ± 2.35) was recorded at Site IV while the lowest pH mean value of 6.15 ± 1.14 was observed at Site II. Seasonally, the highest values of temperature, electrical conductivity, nitrate and THB (38.10 ± 3.66°C, 61842.83 ± 11777.45 µs/cm, 6.09 ± 3.70 mg/L and 38174.83 ± 79509.21 cfu/ml) were observed at Site I during dry season. The highest sediment pH ranged of 6.18–9.18 (7.58 ± 0.27 mV/pH) for sediment was recorded at Site I while the lowest mean pH was observed at Site II (6.87 ± 0.19 mV). The mean of sulphate, lead, chromium, cadmium and total coliform counts were higher at Site II during the dry season while nickel was higher in the rainy season. A total number of 26 species of benthic macroinvertebrates were observed during the period of study belonging to 8 classes namely: grastropoda (11), polychaeta (7), malacostraca (3), bivalvia (2), clitellata (1), thecostraca (1) and insecta (1). Gastropoda recorded highest percentage contribution of 39.12% followed by Polychaeta accounting for 30.34%, while Malacostraca contribution was 2.63%. High abundance of macroinvertebrates was recorded at Site I (256 Indiv/m2) followed by Site IV (252 Indiv/m2) and least abundance was observed at Site II (195 Indiv/m2). Low macrobenthos recorded in this study could be due to high tolerate of physico-chemical changes. The encroaching into aquatic environment around the globe often introduce toxic chemicals into waterbodies which has led to loss of certain organisms, destabilization of sediments, and thriving of tolerant benthic macroinvertebrates. Concerned authority should pass a law to stop encroaching into aquatic environment for land reclamation as a result of high urbanization around the world.

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“…Studies showed that the majority of China's reclamation was concentrated in the Bohai Sea, Yangtze Estuary Delta, and Pearl River Delta (Tian et al, 2016). However, reclamation activities also increased significantly in the Guangxi Beibu Gulf, where a large amount of land was needed for urban construction, further harbors, farmlands, and aquaculture ponds within the development of the Beibu Gulf Economic Zone (Sun et al, 2020;Zhao et al, 2021;Lyu et al, 2022). The drivers of land reclamation are often multitudinous, so accurate evaluation of these factors is important for marine management.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies on the reclamation of the Guangxi Beibu Gulf have mainly focused on coastline changes (Yu et al, 2021), hydrodynamic changes (Wang et al, 2021), and pollutant discharge (Lyu et al, 2022). At present, there have been no attempts to derive a consecutive-yearly estimate of the extent of reclamation and its driving factors.…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal changes and driving forces of reclamation based on remote sensing: A case study of the Guangxi Beibu Gulf

Lü

Zhang²,

Shi³

et al. 2023

Front. Mar. Sci.

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Since 2000, coastal reclamation projects have been implemented in the Guangxi Beibu Gulf to alleviate the shortage of coastal land resources. As a result, the reclamation area has increased significantly. In this study, based on the Landsat program, we tracked coastal reclamation in the coastal waters of Guangxi in the 21st century. An indicator system was proposed to assess the driving forces of reclamation synthetically. Our results showed that 98.6 km2 of coastal waters of the Guangxi Beibu Gulf was reclaimed from 1997 to 2017, in which three regions underwent great changes: Fangcheng Bay, Tieshan Bay, and Qiznhou Bay. Furthermore, spatio-temporal changes of reclamation were affected by the combination of population growth, economic development, and marine industry development in coastal cities. These results provide an important historical reference for tracking the human development processes of the Guangxi Beibu Gulf, and also offer some suggestions for the rational allocation of reclamation resources.

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Compound effect of land reclamation and land-based pollutant input on water quality in Qinzhou Bay, China

Cited by 16 publications

References 48 publications

Sources of nitrate in a heavily nitrogen pollution bay in Beibu Gulf, as identified using stable isotopes

Sources of nitrate in a heavily nitrogen pollution bay in Beibu Gulf, as identified using stable isotopes

Assessing the impact of anthropogenic stressors on water quality, sediment characteristics and benthic macroinvertebrates community in a Coastal Lagoon, Southwest Nigeria

Spatio-temporal changes and driving forces of reclamation based on remote sensing: A case study of the Guangxi Beibu Gulf

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