TY - JOUR
T1 - Tidal effects on variations in organic and inorganic biogeochemical components in Changjiang (Yangtze River) Estuary and the adjacent East China Sea
AU - Song, Shuzhen
AU - Gao, Lei
AU - Ge, Jianzhong
AU - Guo, Wenyun
AU - Li, Daoji
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/3
Y1 - 2022/3
N2 - Nutrients and dissolved organic carbon (DOC) including carbohydrates are essential components that drive the carbon cycle in estuarine and coastal ecosystems. The flood-ebb and spring-neap tidal variations in DOC, carbohydrate and nutrient concentrations were investigated in the Changjiang Estuary and the adjacent East China Sea. The DOC, monosaccharide (MCHO), SiO32−, PO43−, NO3−, and NO2− concentrations fluctuated notably with variations in tidal phases and tidal cycles. The SiO32−, NO3−, PO43−, and NO2− concentrations were significantly correlated with salinity at flood/ebb tides over a tidal cycle, which indicates that physical mixing might be a major factor affecting tidal variations in nutrient elements. However, there were no significant correlations between DOC, carbohydrate concentrations and salinity. Asymmetrical flood-ebb tidal variations in DOC, carbohydrate and nutrient concentrations were observed, which might result from variations in Changjiang freshwater input due to asymmetrical flood-ebb tidal duration time and velocities in the Changjiang Estuary. There were statistically significant flood-ebb tidal differences in SiO32−, NO3−, and NO2− concentrations during spring tide in the Changjiang Estuary and neap tide in the East China Sea. DOC and carbohydrate concentrations showed more complex tidal behaviors due to their specific physical and biological characteristics. Principal component analysis indicated that physical mixing driven by tidal forces was an important factor influencing tidal variations in these organic and inorganic components. Other physical and biological processes, such as absorption and microbial degradation, might have also contributed to the tidal variations in these components. Tidal forcing plays a considerable role in controlling temporal variations in organic and inorganic nutrients and should be considered when sampling in estuarine systems and estimate the fluxes of these components.
AB - Nutrients and dissolved organic carbon (DOC) including carbohydrates are essential components that drive the carbon cycle in estuarine and coastal ecosystems. The flood-ebb and spring-neap tidal variations in DOC, carbohydrate and nutrient concentrations were investigated in the Changjiang Estuary and the adjacent East China Sea. The DOC, monosaccharide (MCHO), SiO32−, PO43−, NO3−, and NO2− concentrations fluctuated notably with variations in tidal phases and tidal cycles. The SiO32−, NO3−, PO43−, and NO2− concentrations were significantly correlated with salinity at flood/ebb tides over a tidal cycle, which indicates that physical mixing might be a major factor affecting tidal variations in nutrient elements. However, there were no significant correlations between DOC, carbohydrate concentrations and salinity. Asymmetrical flood-ebb tidal variations in DOC, carbohydrate and nutrient concentrations were observed, which might result from variations in Changjiang freshwater input due to asymmetrical flood-ebb tidal duration time and velocities in the Changjiang Estuary. There were statistically significant flood-ebb tidal differences in SiO32−, NO3−, and NO2− concentrations during spring tide in the Changjiang Estuary and neap tide in the East China Sea. DOC and carbohydrate concentrations showed more complex tidal behaviors due to their specific physical and biological characteristics. Principal component analysis indicated that physical mixing driven by tidal forces was an important factor influencing tidal variations in these organic and inorganic components. Other physical and biological processes, such as absorption and microbial degradation, might have also contributed to the tidal variations in these components. Tidal forcing plays a considerable role in controlling temporal variations in organic and inorganic nutrients and should be considered when sampling in estuarine systems and estimate the fluxes of these components.
KW - Carbohydrates
KW - Changjiang estuary
KW - Dissolved organic carbon
KW - East China Sea
KW - Nutrients
KW - Tidal cycle
UR - https://www.scopus.com/pages/publications/85121255803
U2 - 10.1016/j.jmarsys.2021.103692
DO - 10.1016/j.jmarsys.2021.103692
M3 - 文章
AN - SCOPUS:85121255803
SN - 0924-7963
VL - 227
JO - Journal of Marine Systems
JF - Journal of Marine Systems
M1 - 103692
ER -
