A sediment record of terrestrial organic matter inputs to Dongting Lake and its environmental significance from 1855 to 2019

Wang, Yanhua; Huang, Yü; Tian, Jiaming; Li, Chunhua; Zhang, Mingli; Lang, Xiulu; Sun, Tao

doi:10.1016/j.ecolind.2021.108090

Cited by 21 publications

(7 citation statements)

References 36 publications

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“…The concentrations of TN and TP in the surface sediments of both the lakeside and riverside wetlands were higher than those in the subsurface sediments, indicating that pollution was relatively severe in recent decades. Wang et al (2021) identified a continuous high nitrogen input and deposition in West Dongting Lake since the 1970s [44]. The nutrient-loading increased fast in Dongting Lake over the past decades as a result of rapid socioeconomic development of the surrounding watershed [45].…”

Section: Distribution Of Sediment Nitrogen and Phosphorusmentioning

confidence: 99%

Differences in sediment nitrogen and phosphorus distribution between riverside and lakeside wetlands in a river-connected lake

Peng,

Niu,

Luo

et al. 2024

Environ. Res. Commun.

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The distribution of nutrients in sediments is the result of multiple factors, including hydrological conditions and vegetation regulation, and in wetlands with complex hydrological conditions, this distribution is uncertain. In this study, the spatial distribution patterns of nitrogen and phosphorus in sediments were studied in the riverside and lakeside wetlands of Dongting Lake, a typical river-connected lake. The results showed that the nitrogen and phosphorus concentrations in the surface sediments were higher than those in the subsurface sediments in both the riverside and lakeside wetlands. In addition, the concentration of total nitrogen (TN) of lakeside wetlands in the surface sediments was higher than that of riverside wetlands, whereas the concentration of total phosphorus (TP) did not differ between the two wetland types. In the surface sediments, there were significant positive correlations between the TN and TP concentrations in the riverside wetlands (p < 0.05), but no significant correlation in the lakeside wetlands (p > 0.05). In riverside wetlands, the nitrogen and phosphorus concentrations showed strong spatial dependence. However, in the lakeside wetlands, the spatial dependence of NO3 −-N was strong, that of NH4 +-N was moderate, and that of TN and TP was weak. This study shows that both hydrology and vegetation cause differences in the distribution of nutrients in the sediments. The results obtained from this investigation clarify the differences of sediment nitrogen and phosphorus distributions in the two types of wetlands and provide a technical reference for the management of different wetland types.

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Section: Distribution Of Sediment Nitrogen and Phosphorusmentioning

confidence: 99%

Differences in sediment nitrogen and phosphorus distribution between riverside and lakeside wetlands in a river-connected lake

Peng,

Niu,

Luo

et al. 2024

Environ. Res. Commun.

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“…The clay and ne silt accounted for a large proportion of the sediment (63.94-86.45%), while no obvious changes were found in the pro le, re ecting a stable sedimentary environment and weak hydrodynamic conditions. The K d value was applied to indicate the regional climatic conditions, and was de ned as the ratio of the coarse silt to clay (Wang et al 2021). Figure 3b shows a decline in the K d value during 1886 − 2019, re ecting a warming and wetting trend.…”

Section: Distribution Of Particle Size and The Ratios Of Different Or...mentioning

confidence: 99%

“…Extraction of n-alkanes: A 2 g (± 0.00001 g) portion of the freeze-dried sample was extracted using dichloromethane/methanol (9:1, v:v) as the solvent in an accelerated solvent extractor (ASE 350, Thermo Fisher Scienti c, USA) (Wang et al 2021). The extracted material was analyzed by gas chromatographymass spectrometry (GC-MS) to determine the total n-C 8 -n-C 40 alkanes (Σn-alkanes).…”

Section: Extraction Procedures For Pahs and N-alkanesmentioning

confidence: 99%

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Responses of burial characteristics of n-alkanes and polycyclic aromatic hydrocarbons in Poyang Lake, China to changes in organic matter inputs from 1886 to 2019

Tian

Chen

Zhao

et al. 2022

Preprint

Self Cite

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The potential influences of the increased anthropogenic stress during the Anthropocene have led to a focus on the sedimentary record in lake and estuary environments. In this study, the spatio-temporal occurrence of 16 polycyclic aromatic hydrocarbons (PAHs) and the n-alkanes from nC12–nC37 associated with organic groups (i.e., organic nitrogen (ON), organic carbon (OC), organic hydrogen (OH), and organic sulfur (OS)) in the 210Pb-dated estuary sediments of Poyang Lake were investigated and their sources and impacts were traced. The ON, OC, OS, and OH contents in the sediment cores ranged between 0.12 − 0.65%, 1 − 7.95%, 0.01 − 0.82%, and 0.03 − 1%, respectively. The age of estuarine sediment cores in Poyang Lake was measured to be 1885–2019 by the 210Pb-dating method. The 133-year sediment deposition occurred over different stages, each with its own characteristics. The PAH fluxes were in the range of 787.65–11269.18 ng cm− 2 a− 1. The high-ring PAHs were dominant, accounting for 74.02% of the total, and the main sources were biomass combustion and automobile exhaust emissions from 1885–2019 without marked change. On a centennial scale, the main n-alkane peaks were nC15, nC31, and nC33, which had an obvious odd-even predominance. The deposition flux of Σn-alkanes varied within the range of 10.33 − 213.86 µg cm− 2 a− 1. The long-chain monomers were dominant, and were found to originate from herbs. The environmental indicator analysis revealed that the restoration of forests and eutrophication of water bodies caused by human activities and a climate change from wet to drought conditions contributed to the relative contribution of autochthonous organisms and vascular plants during 1886–2019.

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“…The land use patterns in the basin changed significantly due to the Great Iron and Steel in 1958, the Great Turning Lakes into fields in 1950s–1970s, and the “Grain for Green” project in 2000. 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).…”

Section: Introductionmentioning

confidence: 99%

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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A sediment record of terrestrial organic matter inputs to Dongting Lake and its environmental significance from 1855 to 2019

Cited by 21 publications

References 36 publications

Differences in sediment nitrogen and phosphorus distribution between riverside and lakeside wetlands in a river-connected lake

Differences in sediment nitrogen and phosphorus distribution between riverside and lakeside wetlands in a river-connected lake

Responses of burial characteristics of n-alkanes and polycyclic aromatic hydrocarbons in Poyang Lake, China to changes in organic matter inputs from 1886 to 2019

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

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