Anthropogenic activities control the source dynamics of sediment organic carbon in the lower reach of an inland river

Yang, Changrong; Li, Zhongwu; Wang, Shilan; Ran, Fengwei; Nie, Xiaodong; Liu, Yaojun; Xiao, Tao

doi:10.1016/j.watres.2023.119779

Cited by 11 publications

(5 citation statements)

References 51 publications

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“…The cascading relationship among catchment environmental changes, organic matter imports, and lake biogenic regimes is suggested by the PLS‐PM results quantified by sediment proxies' types in Dongting Lake. The findings of the multi‐proxy approach for lake sediments challenged the conventional understanding of the watershed environment, lake material inputs, and nutrient concentrations, which mostly relies on source qualification and environmental monitoring data (Bernardino et al., 2020; Hampton et al., 2008; Kong et al., 2017; Wang et al., 2023). Our research provides insights into the cause‐effect cascade relationships and interaction pathways among different types of sediment proxies, thus providing quantitative knowledge of the relationships among multiple attributes in lake sediments.…”

Section: Discussionmentioning

confidence: 99%

“…The split ratios from the three mouths of the Yangtze River to Dongting Lake were estimated to be 19.4% and 12% after the two events and 32% before the first HE (Hu et al., 2014). Both events affected the sediment input from the Yangtze River to Dongting Lake, thereby altering the exogenous material import structure of the lake (Wang et al., 2023; Yu et al., 2018). These significant HEs were successfully recorded using mixed‐source proxy peaks in lake sediments.…”

Section: Discussionmentioning

confidence: 99%

“…Although the social development of Dongting Lake in terms of population, economy, agrarianizing, and urbanization has varied among the sub‐basins since 1950, it has continuously affected land‐use changes over a long period, thus triggering soil erosion and material deposition in the lake (Wang, et al., 2021; Xiao et al., 2023). These watershed ecological changes recorded in the sediments have been explored in terms of sediment source, material composition, and content dynamics (Du et al., 2001; Ran, et al., 2023; Wang et al., 2023). However, challenges still persist in the socio‐ecological integrity of lake‐watershed systems regarding different typical events that are timely, lagged, or not captured by lake sediments and regarding the linear or nonlinear impacts of long‐term pressures and when they were significant.…”

Section: Introductionmentioning

confidence: 99%

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Driver–response relationships in a large shallow lake since the Anthropocene: Short‐term abrupt perturbations versus long‐term sustainable pressures

Ran,

Wang,

Nie

et al. 2024

Global Change Biology

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Lakes, as integral social‐ecological systems, are hotspots for exploring climatic and anthropogenic impacts, with crucial pathways revealed by continuous sediment records. However, the response of multi‐proxies in large shallow lakes to typical abrupt events and sustained drivers since the Anthropocene remains unclear. Here, we explored the driver‐identification relationships between multi‐proxy peaks and natural and anthropogenic events as well as the attribution of short‐term perturbations and long‐term pressures. To this end, sediment core records, socio‐ecological data, and documented events from official records were integrated into a large shallow lake (Dongting Lake, China). Significant causal cascades and path effects (goodness‐of‐fit: 0.488; total effect: −1.10; p < .001) were observed among catchment environmental proxies, lake biogenic proxies, and mixed‐source proxies. The peak‐event identification rate (PEIR) and event‐peak driving rate were proposed, and values of 28.57%–46.43% and 50%–81.25% were obtained, respectively. The incomplete accuracy of depicting event perturbations using sediment proxies was caused by various information filters both inside and outside the lake. PEIRs for compound events were 1.41 (±0.72) and 1.09 (±0.46) times greater than those for anthropogenic‐dominated and natural‐dominated events, respectively. Furthermore, socio‐economic activity, hydrologic dynamics, land‐use changes, and agriculture exerted significant and persistent pressures, cumulatively contributing 55.3%–80.9% to alterations in sediment proxies. Relatively synergistic or antagonistic trends in temporal contributions of these forces were observed after 2000, which were primarily attributed to the “Grain for Green” project and the Three Gorges Dam. This study represents one of the few investigations to distinguish the driver–response relationship of multiple proxies in large shallow lakes under typical event perturbations and long‐term sustained pressures since the Anthropocene. The findings will help policymakers and managers address ecological perturbations triggered by climate change and human activities over long‐term periods.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Driver–response relationships in a large shallow lake since the Anthropocene: Short‐term abrupt perturbations versus long‐term sustainable pressures

Ran,

Wang,

Nie

et al. 2024

Global Change Biology

Self Cite

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“…Literature [3] by the particle swarm algorithm to optimize the quantization factor and scaling factor fuzzy PID, but did not study the problems of the particle swarm precocious factor. Literature [4] [5] of traditional steam turbine unit, the defect of the primary frequency control simulation model of turbine units to make improvements, but separate thermal power control system is studied. Against fire, water, and electricity mixed system of hydropower unit capacity accounted for the effect on the stability of the system frequency, literature [6] simulation analysis in high water and electricity load ratio.…”

Section: Prefacementioning

confidence: 99%

Fire and water mixed system frequency regulation based on fuzzy PID optimization research

Li,

Wang

2023

International Conference on Intelligent Systems, Communications, and Computer Networks (ISCCN 2023)

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If the capacity of a hydropower unit in a certain area is several times the capacity of the thermal power unit, the characteristics of the hydropower unit speed regulation system have a great impact on maintaining the stability of the power grid frequency, according to which this paper builds a water-fire hybrid power system based on simulink, and subdivides the thermal power unit into two categories: no reheating unit and no reheating unit, so as to accurately simulate the role played by different types of units in the water-fire hybrid system in the frequency regulation process. In order to achieve a better FM effect, the text first improves the ordinary particle swarm algorithm to solve the problem of "precociousness"; Secondly, the traditional PID parameters are optimized with the improved particle swarm algorithm, and finally the quantization factor and scale factor in the fuzzy PID are optimized. The above-mentioned fuzzy PID control strategy is applied to the influence of different primary frequency regulation effects on the frequency stability of the system when the capacity proportion of the hydropower unit is different. From the simulation results, it can be seen that the fuzzy PID controller optimized by the improved particle swarm has the characteristics of fast response, good stability, small oscillation amplitude and strong anti-interference ability. And the larger the proportion of hydropower unit capacity, the more prone to more large oscillations in the system frequency, which is not conducive to the recovery of frequency, but can improve the stability of the system frequency.

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“…For example, intensive human activities largely accounted for the relatively higher sedimentation rates in the East Plain of subtropical China, as a large portion of the whole national agricultural production and urban construction after 1950 (Zhang 2016; Wang et al 2018). Hydrological alterations induced by dam construction and embankment also affected the lake sediment flux (Meißner et al 2018; Yang et al 2023). However, open questions remain regarding detecting lake sedimentation state via sedimentation rate dynamics and the effect pathways of climate and anthropogenic activities.…”

mentioning

confidence: 99%

A significant loop of lake sedimentation state links catchment eco‐surroundings and lake biogenic regime shifts

Ran

Nie

Wang

et al. 2023

Limnology & Oceanography

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As an important destination for upstream materials and element accumulation, lake sediments hold a multitude of contextual information about climatic changes and anthropogenic disturbances. However, understanding the lake sedimentation state to link catchment pressures and biogenic regime shifts remains challenging. To address this, research was conducted on the lake sedimentation state, including the dynamics, catchment drivers, effects on biogenic regimes, and responses to typical historical events using nine sediment cores from Dongting Lake, China, a typical global priority ecoregion. Three transitions of lake sedimentation state were distinguished over the century (1937, 1968, and 1993), whereby hydrologic dynamics and land‐use changes in the watershed were the direct drivers with relative contributions of 16.30% and 14.56%, respectively. Lake sedimentation state and organic matter inputs not only preceded sediment biogenic elements at the shift time but also exhibited nonlinear trigger effects on biogenic element contents (R2 = 0.47, p < 0.01), which promoted an increase in sediment biogenic element burial rates. Rate of change analysis indicated that intensive human activities altered the relationship between the sedimentation state and biogenic regime shift, thus revealing the response to anthropogenic events in the catchment. Pathways quantified by the partial least squares path model established the link between watershed attributes and lake biogenic properties via the lake sedimentation state. Our findings revealed a cascading linkage among catchment eco‐surroundings, lake sedimentation states, and biogenic regime shifts. The research further provided insights into driver‐response relationships in lake‐catchment systems.

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Anthropogenic activities control the source dynamics of sediment organic carbon in the lower reach of an inland river

Cited by 11 publications

References 51 publications

Driver–response relationships in a large shallow lake since the Anthropocene: Short‐term abrupt perturbations versus long‐term sustainable pressures

Driver–response relationships in a large shallow lake since the Anthropocene: Short‐term abrupt perturbations versus long‐term sustainable pressures

Fire and water mixed system frequency regulation based on fuzzy PID optimization research

A significant loop of lake sedimentation state links catchment eco‐surroundings and lake biogenic regime shifts

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