Simulating the gross primary production and ecosystem respiration of estuarine ecosystem in North China with AQUATOX

Jin, Yan; Liu, Jingling; You, Xiaoguang; Shi, Xuan; Zhang, Lulu

doi:10.1016/j.ecolmodel.2018.02.004

Cited by 9 publications

(9 citation statements)

References 59 publications

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“…Aristi et al (2015) referred to the increase in GPP and ER in heterotrophic rivers as the "subsidy" effect of WWTP effluents. As a result of this, a positive correlation between GPP and ER was found (r 2 =0.900, p<0.001), which has also been widely reported by many studies (e.g., Chen et al 2009;Hall and Beaulieu, 2013;Yan et al 2018;Hung et al 2020). However, organic matter associated with WWTP effluents (e.g., higher DOC concentrations at D3.0) can be an important energy input exceeding in-situ GPP (Gücker et al 2006;Aristi et al 2015); Additionally, GPP is directly controlled by light availability (Griffiths et al 2013;Ferreira et al 2020).…”

Section: Factors Driving Gpp and Ersupporting

confidence: 82%

Wastewater effluents affect ecosystem metabolism: an evaluation of activation energy case study from the River Wandle, UK

Zhang

Chadwick

2022

Preprint

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River ecosystem metabolism (REM) is a measure of ecological function which integrates gross primary production (GPP) and ecosystem respiration (ER). Urban rivers often receive effluents from wastewater treatment plants (WWTP) which frequently alter nutrient concentrations and modify temperature regimes of receiving water bodies. In this study, we applied the nighttime slope method (NSM) to estimate diurnal REM at sites above and below a wastewater outfall on the River Wandle, a tributary to the River Thames, and structural equation modelling (SEM) revealed that nutrient supply, water temperature and light availability were the main factors driving REM. Overall estimated GPP and ER from our study sites were like those of urban impacted rivers in other countries. Upstream to downstream, GPP values (0 ~ 21.2 mgO2·L− 1·d− 1) were similar, but ER values (5.5 ~ 10.1 mgO2·L− 1·d− 1) were significantly higher at the downstream site receiving WWTP effluents. GPP/ER ratios were > 1 indicating heterotrophic conditions during the study. We found that sites had similar activation energy associated with ER suggesting our work provides a useful reference for estimating temperature corrected metabolic processes for other urban rivers in the region. Structural equation modelling (SEM) revealed that nutrient supply, water temperature and light availability were the main factors driving REM. This research highlights the major environmental factors affecting REM providing needed evidence to inform river restoration and future in-stream management.

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Section: Factors Driving Gpp and Ersupporting

confidence: 82%

Wastewater effluents affect ecosystem metabolism: an evaluation of activation energy case study from the River Wandle, UK

Zhang

Chadwick

2022

Preprint

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“…The SEM model revealed that NO 3 − , NH 4 + and PO 4 3− were key nutrients affecting aquatic biological activity, and these increases can promote the growth and reproduction of aquatic organisms (e.g., phytoplankton), thus accelerating GPP and ER (Tank and Dodds 2003;Noormets 2009;Aristi et al 2015) referred to the increase in GPP and ER in heterotrophic rivers as the "subsidy" effect of WWTP effluents. As a result of this, a positive correlation between GPP and ER was found (r 2 = 0.900, p < 0.001), which has also been widely reported by many studies (e.g., Chen et al 2009;Hall and Beaulieu 2013;Yan et al 2018;Hung et al 2020). However, organic matter associated with WWTP effluents (e.g., higher DOC concentrations at D3.0) can be an important energy input exceeding insitu GPP (Gücker et al 2006;Aristi et al 2015).…”

Section: Factors Driving Gpp and Ersupporting

confidence: 79%

Influences of Elevated Nutrients and Water Temperature from Wastewater Effluent on River Ecosystem Metabolism

Zhang

Chadwick

2022

Environ. Process.

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River ecosystem metabolism (REM) is a measure of ecological function which integrates gross primary production (GPP) and ecosystem respiration (ER). Urban rivers often receive effluents from wastewater treatment plants (WWTP) which frequently alter nutrient concentrations and modify temperature regimes of receiving water bodies. To investigate how variations in nutrients and water temperature affect REM, we applied the night-time slope modelling to estimate diurnal REM at sites above and below a wastewater outfall on the River Wandle, UK. Overall, estimated GPP (0–21.2 mgO2·L− 1·d− 1) and ER (5.5–10.1 mgO2·L− 1·d− 1) from our study sites were similar to those of urban impacted rivers in other countries. GPP values were similar between sites, but downstream ER values were significantly higher affected by the WWTP effluent. GPP/ER ratios were < 1 indicating heterotrophic conditions and the river as a carbon source during the study. We found that sites had similar activation energy associated with ER suggesting our work provides a useful reference for estimating temperature corrected metabolic processes for other urban rivers in the region. Furthermore, structural equation modelling revealed that nutrient supply, water temperature and light availability were the main factors driving REM. This research highlights the major environmental factors affecting REM, which helps to understand the response of river metabolism and river regulation of regional carbon cycle to future climate change and provide evidence to inform river restoration and future in-stream management.

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“…Wang et al (2007) estimated that the NEP ranged from 1.1 to 1.3 gC m −2 day −1 during 2000–2006, accounting for 7.8%–9.7% of the total NEP in China. Yan et al (2018) attributed the highest PP and NEP in summer to high temperatures, nutrient inputs and light availability.…”

Section: Metabolism Characteristics Of Study Riversmentioning

confidence: 97%

“…Estuarine NEP ranged from −0.01 to 0.2 gC m −2 day −1 , which was higher than in the Yangtze and Yellow River estuaries. Additionally, Yan et al (2018) found estuarine NEP values greater than 0 in summer indicating autotrophic conditions. However, CR ranged from 0.02 to 0.3 gC m −2 day −1 , with the maximum occurring in spring and stimulated microbial activity (Yan et al, 2018).…”

Section: Metabolism Characteristics Of Study Riversmentioning

confidence: 99%

A synthesis of ecosystem metabolism of China's major rivers and coastal zones (2000–2020)

2022

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Ecosystem metabolism is a vital measurement for understanding the dynamics of aquatic environments. China has a range of aquatic resources and in the past two decades, there has been an increasing interest in ecosystem metabolism research. However, no studies have evaluated overall variation and environmental patterns which affect metabolism in China's vast range of aquatic systems. For this paper, we searched for articles with metabolism data for China's major rivers and coastal zones from 2000 to 2020. We identified 127 studies documenting ecosystem metabolism functions including primary production (PP), community respiration (CR) and net ecosystem production (NEP). Using path analysis, we documented relationships across a range of environmental parameters. Light availability affected riverine and coastal PP (<0.1-10.7 gC m À2 day À1 ), while riverine PP was also linked to precipitation, photosynthesis-related biomass, and land-use variables.Riverine and coastal CR ranged from 0.01 to 24.3 gC m À2 day À1 and was affected strongly by nutrient concentrations. Average NEP ranged from 2.9 to 9.2 gC m À2 day À1 , suggesting the potential of some of the evaluated ecosystems to be CO 2 sinks. Within this review, the large spatiotemporal range allows for a wideranging understanding of the variation of metabolic processes which contribute to CO 2 dynamics and the role of aquatic ecosystems in regional climate change. Additionally, by evaluating aquatic ecosystem metabolism across such a diverse range of environmental conditions this work provides a scientific basis for future assessments of ecological risks under the complex conditions of climate change.

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Simulating the gross primary production and ecosystem respiration of estuarine ecosystem in North China with AQUATOX

Cited by 9 publications

References 59 publications

Wastewater effluents affect ecosystem metabolism: an evaluation of activation energy case study from the River Wandle, UK

Wastewater effluents affect ecosystem metabolism: an evaluation of activation energy case study from the River Wandle, UK

Influences of Elevated Nutrients and Water Temperature from Wastewater Effluent on River Ecosystem Metabolism

A synthesis of ecosystem metabolism of China's major rivers and coastal zones (2000–2020)

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