Stable carbon isotope as a proxy for the change of phytoplankton community structure in cascade reservoirs from Wujiang River, China

Wang, B.; Liu, C. Q.; Peng, Xi; Wang, F.; Chen, C.

doi:10.5194/bgd-8-831-2011

Cited by 3 publications

(3 citation statements)

References 47 publications

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“…As the intensity of WLF decreases (i.e., from daily and weekly to seasonal and annual), soil nutrients are depleted due to long‐term flooding and scouring, corresponding to a higher stress environment (see soil total nitrogen Figure A1 in Appendix S1). Specifically, in the daily regulated reservoirs (i.e., SFY and YP, Figure 1), which experience the most disturbance due to a high frequency (daily) and short duration inundation cycle, herbaceous plants tend to be more abundant if they can adapt to short‐term flooding events (Wang et al, 2011; Wang, Lei, et al, 2012; Wang, Shao, et al, 2012). Weekly (i.e., SL, ST, and PS, Figure 1) and seasonally regulated reservoirs (i.e., DF, WJD, and GPT, Figure 1) experience obvious transitional characteristics (from daily to annual) in terms of hydrological disturbance and vegetation community.…”

Section: Methodsmentioning

confidence: 99%

Comparative impacts of dam water level regimes on herbaceous plant growth strategies in cascade reservoirs and downstream reaches of a major river

et al. 2022

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Flow regulation is a prolific and growing influence on rivers world‐wide. Nine cascade hydropower dams were constructed along the 1,150‐km Wujiang River in China over the past 30 years, disrupting longitudinal continuity. Water level fluctuations in the associated reservoirs range between daily, weekly, seasonal, and annual, depending on the type of regulation, but the comparative impacts of these regimes on plant growth strategies, or the extent of their downstream influence, is unknown. Competitor, stress‐tolerator, and ruderal (CSR) plant strategies were used to assess the impact of reservoir regulation type on the riparian herbaceous plant community based on sampling the inundation zone of nine reservoirs and their downstream river reaches during 2017 and 2018. Our results revealed profound differences in CSR plant strategies of the dominant vegetation with respect to water level regime. While ruderal plants dominated (45%–60% of species), irrespective of regulation type, vegetation in reservoirs exhibited a strong shift from stress‐tolerators (e.g., Cynodon dactylon, C‐11.9:S‐41.5:R‐46.5%) to competitors (e.g., Reynoutria japonica, C‐77.9:S‐0:R‐22.0%) with increasing intensity of water level fluctuation, reflecting the shift from annual to daily regulation. The width of the inundation zone was the best overall variable in explaining the CSR strategies of riparian vegetation, both in the reservoir inundation zone (r2‐adj = 15.4%) and the downstream river (r2‐adj = 7.3%). Retention time significantly explained variation in CSR plant strategies in the reservoir inundation zone (r2‐adj = 3.7%, p = 0.002) but not downstream (p > 0.01). There was also a clear scale dependency of CSR plant strategies, with an increase in stress tolerators (average slope = 0.7%/km) and decline of competitor (average slope = −0.3%/km) and ruderal plants (average slope = −0.9%/km) with increasing distance downstream from dams. The growth strategies of the dominant riparian vegetation changed with the magnitude and frequency of water level fluctuations caused by differences in regulation type, and local environmental conditions. Clear scale dependency in the CSR plant strategies was observed with distance from the dam, with ruderals dominating closest to the reservoirs and declining gradually downstream as stress tolerators increased. Our study helps to evaluate the impact of river damming on the functional traits of riparian vegetation and to predict the resilience and restoration potential of riparian vegetation under different forms of human disturbance.

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Section: Methodsmentioning

confidence: 99%

Comparative impacts of dam water level regimes on herbaceous plant growth strategies in cascade reservoirs and downstream reaches of a major river

et al. 2022

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“…The average δ 13 C DIC of CO 2 produced by root respiration of C 3 vegetation is −27% because the migration and diffusion of CO 2 in the soil layer will produce approximately 4% isotope fractionation, so the δ 13 C DIC value of soil CO 2 produced by plant respiration and organic matter oxidation decomposition is approximately −23%, and the δ 13 C DIC value of marine carbonate rocks in karst areas is 0% [49][50][51]. According to the stoichiometric relationships of carbonate rock dissolution, with the participation of carbonic acid (H 2 CO 3 ), 2 mol HCO 3 − will be produced in the process of carbonate rock dissolution, of which 1 mol is derived from atmospheric/soil CO 2 in the watershed and 1 mol from carbonate rocks (Equation ( 2)) [52].…”

Section: Weathering Of Carbonate Rocks and C-n Coupling Relationship ...mentioning

confidence: 99%

Study on the Carbon and Nitrogen Isotope Characteristics and Sources and Their Influence on Carbon Sinks in Karst Reservoirs

Zhou

Kong

Zhang

et al. 2023

Land

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The hydrochemical analysis method was used to reveal the sources and spatiotemporal variations of carbon and nitrogen elements in the Pingzhai Reservoir, and the C–N coupling cycle and its influence on the karst carbon sink are discussed. The results show the following: (1) The hydrochemical type of the study area is HCO3-Ca. (2) From the river to the reservoir and then to the reservoir outlet, the values of HCO3− and δ13CDIC showed an opposite trend. The values of NO3−, δ15N-NO3−, and δ18O-NO3− were different in each stage of the river. (3) HCO3− mainly comes from the weathering of carbonate rocks and the oxidative decomposition of organic matter. Nitrate mainly comes from chemical fertilizers, soil organic nitrogen, sewage, and livestock manure. (4) The average proportion of HCO3− produced by HNO3 dissolving carbonate rock is 8.38%, but this part does not constitute a carbon sink. Compared with rivers, the proportion of HCO3− and (Ca2+ + Mg2+) produced by HNO3 dissolving carbonate rock in reservoir water is relatively large. The input of nitrate not only pollutes the water body with NO3− but also changes the carbon source/sink pattern of the water–rock interaction.

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“…Isotopic signatures of O in NO3range from -15 to 100‰, with the higher end of the spectrum being associated with atmospheric nitrate (Bӧhlke et al, 2009;Kendall, 1998), and the lower ranges (-15 to 10‰) being associated with biogenic nitrate (Bӧhlke, 2002 (Wang et al, 2011), and can be used to provide insight on the proliferation of different algal types.…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton community structure response to groundwater-borne nutrients in the Inland Bays, Delaware, USA

Torre¹,

Coyne²,

Kroeger³

et al. 2019

Mar. Ecol. Prog. Ser.

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Stable carbon isotope as a proxy for the change of phytoplankton community structure in cascade reservoirs from Wujiang River, China

Cited by 3 publications

References 47 publications

Comparative impacts of dam water level regimes on herbaceous plant growth strategies in cascade reservoirs and downstream reaches of a major river

Comparative impacts of dam water level regimes on herbaceous plant growth strategies in cascade reservoirs and downstream reaches of a major river

Study on the Carbon and Nitrogen Isotope Characteristics and Sources and Their Influence on Carbon Sinks in Karst Reservoirs

Phytoplankton community structure response to groundwater-borne nutrients in the Inland Bays, Delaware, USA

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