Spatial variation of the C: N ratio and its relationship with the carbon cycle in the middle reaches of the Yellow River during summer

Cheng, Dong; Feng, Minquan; Wang, Yibo; Dang, XiaoGe

doi:10.1080/02757540.2022.2122451

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…This study emphasizes the lateral exchange of C and N across the terrestrial-aquatic continuum and underscores how their interconnected effects facilitate the connection of material flows, energy dynamics, and biological interactions within coastal ecosystems (Cheng et al, 2022). The reciprocal lateral C and N flows within ecosystems represent interconnected processes that mutually couple each other (Liu et al, 2020a).…”

Section: Importance and Implications Of Coupling C/n Fluxesmentioning

confidence: 90%

Rooting Meta-ecosystems with Reciprocal Lateral Carbon and Nitrogen Flows in a Yangtze Coastal Marsh

Gao,

Zhao,

Saintilan

et al. 2023

Preprint

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The dynamics of hydrological lateral nutrient fluxes contribute to our understanding of ecological functions related to energy, materials, and organism flows across various spatiotemporal scales. To explore the connectivity between multiple spatial flow processes, we conducted a one-year field measurement to assess lateral hydrologic carbon (C) and nitrogen (N) fluxes over the continental shelf in the Yangtze estuary. We observed a significant correlation between the differences in remote sensing-based estimates of gross primary production (GPP) (∆GPPMODIS) and the differences in eddy covariance (EC) tower-based GPP (∆GPPEC) at both high-elevation and low-elevation sites. Over the course of a year, our predicted daily maximum tidal elevation (TE) closely matched the observed values in the creek, which facilitated the development of theoretical models to simulate biogeochemical cycling processes and aquatic ecosystem functions. Our findings indicate that the studied saltmarsh acts as a net exporter of dissolved total C (DTC) while serving as a net sink for dissolved total N (DTN). Furthermore, there is a significant correlation in the total dissolved stoichiometry of the C/N ratio between imports and exports. These findings highlight the importance of integrating ecological stoichiometric principles to gain a deeper understanding of the complex relationships between physical, chemical, and biological processes, particularly within the context of the meta-ecosystem framework. Additionally, when considering reciprocal hydrological lateral C and N flows, single ecosystem can function both as sources and sinks within the meta-ecosystem framework.

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Section: Importance and Implications Of Coupling C/n Fluxesmentioning

confidence: 90%

Rooting Meta-ecosystems with Reciprocal Lateral Carbon and Nitrogen Flows in a Yangtze Coastal Marsh

Gao,

Zhao,

Saintilan

et al. 2023

Preprint

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“…However, these earlier studies primarily focused on the variability of pCO 2 and its influencing factors within limited hydrological stations or individual watersheds. Moreover, our previous research specifically analyzed the distribution of pollutants in the middle reaches of the Yellow River in relation to the carbon cycle (Cheng et al, 2022). Notably, many studies have focused on the response relationship between C:N ratio changes and river water pCO 2 .…”

Section: Introductionmentioning

confidence: 99%

Spatial variation characteristics and influencing factors of CO₂ partial pressure in the middle reaches of the Yellow River during summer

Dang,

Feng,

Jing

et al. 2023

River Research & Apps

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The partial pressure of CO2 in rivers regulates the intensity and direction of carbon dioxide (CO2) exchange at the water–air interface. Environmental, nutrient factors, and their stoichiometric ratios within the watershed may affect the level of carbon dioxide partial pressure in rivers. However, the relationship between pCO2 responses to the environment, nutrient factors, and their stoichiometric ratios at a large watershed scale was not well understood. In this study, water samples from 20 locations in the mainstream and 16 tributaries of the middle reaches of the Yellow River were collected to study the spatial characteristics of pCO2 and its influencing factors. pCO2 vales showed spatial heterogeneity ranging from 45.57 to 3631.48 μatm, and an average of 1341.87 μatm. Relative to the atmospheric equilibrium value (415 μatm), 90% of the samples were supersaturated. During the study period, higher pCO2 appeared in the Wanjiazhai Reservoir at the northernmost part of the mainstream in the middle reaches, and in the tributaries of the Fen, Wei, and Beiluo Rivers. Overall, the transition from carbon sink to carbon source was experienced in the middle reaches of the Yellow River from north to south. River pCO2 exhibited a significant correlation with phosphorus concentrations and their associated stoichiometric ratio, suggesting that microbial metabolism drove CO2 saturation in rivers. In addition, different land use proportions contributed significantly to changes in river pCO2.

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Integrating monthly spring tidal waves into estuarine carbon budget of meta-ecosystems

Gao,

Chen,

Saintilan

et al. 2023

Science of The Total Environment

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Spatial variation of the C: N ratio and its relationship with the carbon cycle in the middle reaches of the Yellow River during summer

Cited by 4 publications

References 23 publications

Rooting Meta-ecosystems with Reciprocal Lateral Carbon and Nitrogen Flows in a Yangtze Coastal Marsh

Rooting Meta-ecosystems with Reciprocal Lateral Carbon and Nitrogen Flows in a Yangtze Coastal Marsh

Spatial variation characteristics and influencing factors of CO₂ partial pressure in the middle reaches of the Yellow River during summer

Integrating monthly spring tidal waves into estuarine carbon budget of meta-ecosystems

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Spatial variation of the C: N ratio and its relationship with the carbon cycle in the middle reaches of the Yellow River during summer

Cited by 4 publications

References 23 publications

Rooting Meta-ecosystems with Reciprocal Lateral Carbon and Nitrogen Flows in a Yangtze Coastal Marsh

Rooting Meta-ecosystems with Reciprocal Lateral Carbon and Nitrogen Flows in a Yangtze Coastal Marsh

Spatial variation characteristics and influencing factors of CO2 partial pressure in the middle reaches of the Yellow River during summer

Integrating monthly spring tidal waves into estuarine carbon budget of meta-ecosystems

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Spatial variation characteristics and influencing factors of CO₂ partial pressure in the middle reaches of the Yellow River during summer