International Journal of Sediment Research最新文献

{"title":"Geochemical indices and sedimentation rates in the Pardo River basin, São Paulo state, Brazil","authors":"Daniel Marcos Bonotto","doi":"10.1016/j.ijsrc.2024.07.002","DOIUrl":"10.1016/j.ijsrc.2024.07.002","url":null,"abstract":"<div><p>Sediment geochemical indices and sedimentation rates data from the Pardo River watershed, São Paulo State, Brazil, provide relevant reference guidelines for stakeholders to plan future actions aiming to achieve the appropriate management of that hydrographic basin. The watershed includes 20 municipalities where about 650,000 inhabitants are living and whose waters after withdrawal and treatment supply ∼300,000 people in that region. Six sediment cores provided the geochemical and radiometric dataset, which was obtained from sampling sites located in the following cities: Ourinhos, Santa Cruz do Rio Pardo, Águas de Santa Bárbara, Avaré, Botucatu, and Pardinho. The concentration data for some metals were compared with the reference values established by the Brazilian environmental legislation for sediment dredging because currently there is a lack of specific quality guidelines for marine or fluvial sediment in Brazil. Also, the entire dataset was used in the calculation of two traditional geochemical indices, i.e., the enrichment factor (EF) and contamination factor (CF). In some cores, both indices provided insight revealing possible anthropogenic inputs of magnesium oxide (MgO), potassium oxide (K<sub>2</sub>O), sulfur trioxide (SO<sub>3</sub>), vanadium oxide (V<sub>2</sub>O<sub>5</sub>), copper (II) oxide (CuO), and other constituents due to development of activities related to the crop production. The constant rate of supply (CRS) of the unsupported/excess lead 210 (<sup>210</sup>Pb) model has been successfully applied to the obtained a radiometric <sup>210</sup>Pb dataset, yielding mean values of the mass accumulation rate (MAR) between 0.86 and 7.23 g/(cm<sup>2</sup>·y) and linear sedimentation rates (LSR) ranging from 2.9 to 7.1 cm/y. Both of these rates exhibited a significant correlation, representing physical weathering processes occurring in the basin. Chemical weathering rates reported in the literature indicate values much lower than the physical weathering rates and such findings have also been confirmed in the current study when the obtained data were compared with results from previous investigations in the Pardo River watershed. The CRS <sup>210</sup>Pb chronological model was useful to track historical changes in the MgO and CuO concentration in the sediment cores, allowing curves to be plotted exhibiting major peaks in core 1 (1980–2010) and core 3 (2000–2010), a continuous increase from 1970 onwards until 2010 (core 4), and a sharp increase at the end of the monitoring period, 2017 (cores 5 and 6). Data available for the harvested area at a municipality located within the basin for the period 1990–2022 have indicated a more pronounced increase over the last years in the production of sugar cane, soybeans, and oranges, implying an increasing use of fertilizers and agricultural correctives for crop production, whose chemical composition would justify the trends observed for MgO and CuO concentrations in the sediment core","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"39 5","pages":"Pages 804-824"},"PeriodicalIF":3.5,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000751/pdfft?md5=d4bfcc761ac985a5872fda6162172718&pid=1-s2.0-S1001627924000751-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141772939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of tree and shrub species on soil quality, sediment detachment capacity caused by rills and surface slope stability in forest lands of Northern Iran","authors":"Misagh Parhizkar","doi":"10.1016/j.ijsrc.2024.07.001","DOIUrl":"10.1016/j.ijsrc.2024.07.001","url":null,"abstract":"<div><p>A root system is an important factor to increase soil resistance to detachment of soil particles. However, due to the large number of species, there is a need for studying the impacts of native plant species on soil quality and soil erodibility. This investigation did flume experiments at various soil slopes (9.2%, 18.1%, 25.1%, and 32.5%) and different water flow rates (0.56, 0.67, 0.74, 0.81, and 0.94 L/(m·s)), to evaluate sediment detachment capacity caused by rills (<em>D</em>_c) and rill erodibility (<em>K</em>_r) as well as the soil quality of hillslopes with three common species including <em>Carpinus betulus</em> (as a natural tree species), <em>Alnus glutinosa</em> (as a planted tree species) and <em>Mespilus germanica</em> (as a shrub species) in forestland of northern Iran. The variability of <em>D</em>_c has been associated with soil properties and root characteristics of <em>Carpinus betulus</em>. <em>D</em>_c was significantly lower (average, −45%) for soils under <em>Carpinus betulus</em> compared to soils with the two other plant species (<em>p</em> &lt; 0.01). This was due to the higher values of soil properties including medium weight diameter of soil aggregates (MWD), organic carbon (OC), total nitrogen (TN), total phosphorous (TP), potassium (K), calcium (Ca), magnesium (Mg) as well as to the more extended root system, as confirmed by the negative correlations between <em>D</em>_c and the studied variables. <em>K</em>_r also was different among the studied soils and plant species. The root system of <em>Carpinus betulus</em> also played a useful role for increasing soil resistance to rill erosion yielding a safety factor (1.61) in the studied forest ecosystem. Overall, the current study supports a broader use of native species (such as <em>Carpinus betulus</em>) in areas exposed to surface erosion and instability, as an effective eco-engineering conservation technique and an alternative technology instead of utilizing artificial and expensive management practices.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"39 5","pages":"Pages 795-803"},"PeriodicalIF":3.5,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S100162792400074X/pdfft?md5=9520cf1f43d4c919dcc36a3e861765bc&pid=1-s2.0-S100162792400074X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141693473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Soil texture and vegetation root density assessment on regulating erosion across river floodplains","authors":"Iordanis Moustakidis ,&nbsp;Keith Schilling ,&nbsp;Larry Weber","doi":"10.1016/j.ijsrc.2024.06.004","DOIUrl":"10.1016/j.ijsrc.2024.06.004","url":null,"abstract":"<div><div>Over the last few decades, floodplain management with best management practices has been utilized to treat areas susceptible to soil erosion and degradation. A major emphasis has been placed on the role of the above-ground vegetation to regulate soil erosion, but less attention has been directed to the floodplain soil types and root interactions. The goal of the current study was to quantify the effectiveness of soil texture and vegetation root density in reducing soil erosion in the highly agricultural Turkey River watershed in Iowa. For the purposes of this study, twenty-four topsoil samples were removed from various locations across the lower, i.e., active, and higher elevation river floodplain soils of five identified field sites along the Turkey River longitudinal profile. The topsoil sampling process was designed based on site-specific flood inundation maps. Using detailed particle size analyses and topsoil erodibility experiments, results indicated that the threshold values for the onset of erosion increased longitudinally, from upstream to downstream, matching the pattern identified for silt and clay particles in floodplain soils. Statistical analysis confirmed that there is a strong linear correlation between the threshold values for erosion to occur and the fine particle content in floodplain soils, as well as the existence of vegetation characterized by dense and well-developed root systems. Overall, the fine particle content of floodplains’ surface soils and the existence of vegetation with dense and well-developed roots determined the threshold values for erosion, whereas the presence of vegetation with non-dense and non-well-developed root systems had a negligible effect, similar to bare soil, on controlling soil erosion. The findings of the current research can be applied by watershed management authorities to protect floodplain areas at risk and prevent further soil degradation and water pollution.</div></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"39 6","pages":"Pages 855-867"},"PeriodicalIF":3.5,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141698760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Grain-size distribution in suspension under non-equilibrium conditions","authors":"Arun Kumar,&nbsp;Sourav Hossain,&nbsp;Sumit Sen,&nbsp;Shiv Mohan,&nbsp;Koeli Ghoshal","doi":"10.1016/j.ijsrc.2024.06.003","DOIUrl":"10.1016/j.ijsrc.2024.06.003","url":null,"abstract":"<div><p>This paper presents a model to characterize the distribution of non-uniform sediment in suspension above erodible sediment beds in turbulent flow under non-equilibrium conditions. The modeling process incorporates three crucial features of sediment-laden flow: mixing length, stratification, and settling velocity. The advection–diffusion equation for the <span><math><mrow><mi>k</mi></mrow></math></span>-th grain-size class is modified accordingly. The model's calculations encompass the determination of reference height and reference concentration, accounting for the presence of different-sized particles in the flow. The numerical solution of the model effectively captures concentration variations for distinct particle sizes in streamwise and vertical directions, as well as temporal changes. As experimental data under non-equilibrium conditions with different sediment sizes are unavailable, the study focuses on specific experiments involving various sediment beds with a mixture of different grain sizes under equilibrium conditions. The current findings reveal that the concentration magnitude decreases downstream with time for all grain sizes, eventually reaching an equilibrium state. This behavior is consistent with variations in downstream distance at a specific time. The mixing length which is concentration-dependent, first increases the suspension concentration for all grain sizes at smaller downstream distance and then the effect reverses for all grain sizes at larger downstream distance. A similar trend is observed when considering both stratification and mixing length. An error analysis evaluates the model's performance, indicating that the least error corresponds to datasets incorporating all considered effects.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"39 5","pages":"Pages 774-794"},"PeriodicalIF":3.5,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000659/pdfft?md5=3fe4708f4a1937e75c6d35f161b2715c&pid=1-s2.0-S1001627924000659-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142075772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural sediment connectivity as a tool in validating sediment fingerprinting results","authors":"","doi":"10.1016/j.ijsrc.2024.06.002","DOIUrl":"10.1016/j.ijsrc.2024.06.002","url":null,"abstract":"<div><p>Sediment control in watersheds requires information about soil erosion and sediment yield hotspot areas. Sediment connectivity is an emerging concept contributing to this field and structural sediment connectivity is a concept derived from sediment connectivity. Determining structural sediment connectivity in a watershed can yield a comprehensive image of sediment management possibilities applicable at the watershed scale. However, in most studies, the validity of extracted sediment connectivity maps has not been evaluated holistically. The current study is, therefore, designed to determine a valid structural sediment connectivity map and to use it to validate findings of sediment fingerprinting of the Idelo watershed in Zanjan province, Iran. Digital elevation model (DEM), slope, vegetation cover, and flow accumulative layers have been used in compiling the structural sediment connectivity map. Field observations were made to calculate the field connectivity index. The results showed that the mean structural sediment connectivity index of the target watershed is −6.18. Moreover, areas in the downslope section near the outlet and the narrow strips around the watershed boundaries have moderate to high structural connectivity. The results of field validation showed there is an acceptable agreement between the field connectivity index and the structural connectivity map. Also, these results confirmed previous findings of sediment fingerprinting in the study area. Based on the findings of the current study, determining the structural sediment connectivity index is an efficient method to make management and conservation decisions and control erosion and sediment in the watershed.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"39 5","pages":"Pages 845-853"},"PeriodicalIF":3.5,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000647/pdfft?md5=098d59cf86f4ac8ad020e30e3e912fab&pid=1-s2.0-S1001627924000647-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of non-equilibrium parameters on the numerical modeling of settling basins","authors":"","doi":"10.1016/j.ijsrc.2024.06.001","DOIUrl":"10.1016/j.ijsrc.2024.06.001","url":null,"abstract":"<div><p>Settling basins are one of the structures required for removing excess sediment entering irrigation or power canals diverting water from a river. A numerical model is needed to simulate the flow and sedimentation pattern in settling basins. In the current research, a depth-averaged two-dimensional numerical model of flow and sediment is developed using the finite volume method and based on the time-splitting scheme, which also allows for simulating sediment in a non-equilibrium state. The simulation of flow and sedimentation is done by the numerical model in a decoupled method. Sensitivity analysis was applied to estimate the effects of non-equilibrium parameters and the settling velocity on the numerical results. The results revealed that Maleki and Khan's formula and Zhang and Xie's formula are suitable for estimating the suspended load adaptation coefficient and the sediment settling velocity in the numerical simulations. Investigation of the formulas for the bed adaptation length indicated that all three methods considered in the current research had almost equal accuracy in predicting the sediment concentration distribution in the settling basin. The developed model has been verified against two experimental tests, showing a good fit between observed data and the simulated results.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"39 5","pages":"Pages 761-773"},"PeriodicalIF":3.5,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000635/pdfft?md5=7e1edfc40197f6122ef402dd4aa3f2d5&pid=1-s2.0-S1001627924000635-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TOC","authors":"","doi":"10.1016/S1001-6279(24)00047-7","DOIUrl":"https://doi.org/10.1016/S1001-6279(24)00047-7","url":null,"abstract":"","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"39 3","pages":"Pages ii-iii"},"PeriodicalIF":3.6,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000477/pdfft?md5=6610ee6278375bd3abb5d0cf0a2fda7d&pid=1-s2.0-S1001627924000477-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141094926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling best management practices to reduce future sediment yield in the Fincha watershed, Ethiopia","authors":"","doi":"10.1016/j.ijsrc.2024.04.010","DOIUrl":"10.1016/j.ijsrc.2024.04.010","url":null,"abstract":"<div><p>Severe socio-environmental pressures and land degradation are substantially impacting Ethiopia, eventually leading to low agricultural productivity, with a consequent very high rate of poverty and food insecurity. The current study investigates the future effect of four management practices on reducing sediment yield in the Fincha sub-watershed, Ethiopia, by developing a soil and water assessment tool (SWAT) model over the next three decades (2019–2050). Four best management practices (BMPs) largely applied in the region were considered here. It was found that filter strips can decrease the sediment yield by 65.64 and 58.77, soil or stone bund by 76.37 and 73.07, contour farming by 79.79 and 75.86, and terracing by 84.9% and 76.32% for the years 2019 and 2050, respectively. The impact of these BMPs on various hydrological processes also was evaluated using SWAT. It was found that BMPs are effective in reducing surface runoff and water yield and in increasing groundwater and lateral flows, while they have a reduced effect on evapotranspiration, lateral flow and water yield. The findings presented here point out that all the simulated management practices significantly lower surface runoff and consequently sediment yield across the watershed, but they are not effective enough to reduce soil erosion below a critical threshold that assures crop production. Therefore, to achieve tolerable soil loss, additional soil and land management strategies, such as biological measures and a combination of BMPs are needed and should be considered in future investigations. In summary, the current study offers evidence for managing river basins in semi-arid regions, and can help in ensuring sustainable management of natural resources.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"39 5","pages":"Pages 737-749"},"PeriodicalIF":3.5,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000532/pdfft?md5=957a706a95ece3a99a6c30254a5ee74d&pid=1-s2.0-S1001627924000532-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141148753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sand sheets—the major dust source in the western Lake Urmia playa—A comprehensive study of the soil-dust properties and stabilization","authors":"Nikou Hamzehpour ,&nbsp;Gholam Reza Mahdavinia ,&nbsp;Mehdi Rahmati","doi":"10.1016/j.ijsrc.2024.04.003","DOIUrl":"10.1016/j.ijsrc.2024.04.003","url":null,"abstract":"<div><p>Climate change accelerated by anthropogenic activities has led to the shrinkage and eventually disappearance of salt lakes all over the world. Gradual desiccation of Lake Urmia (LU) in northwestern Iran, as one example of desiccating lakes, has led to the exposure of the lakebed sediment with enormous dust emission potential in some parts. Sand sheets of western LU are identified as one of the major contributors to aerosols in this region. Yet, dust blown from this area is not well characterized. The aims of the current study were, therefore, to comprehensively investigate the origin of dust from sand sheets; the characteristics of dust and temporal variability of the aerosol and to test the effectiveness of the application of sodium alginate (SA) on soil crusting and stabilization. Soil samples were collected from the two prevailing soil types from sand sheets in August 2020. Dust samples were also collected during four time periods: July and August (the beginning of the dry season); October and November (the beginning of the wet season). Using SA with varying concentrations and different methods of application, the effectiveness of the induced crusts was investigated. Authigenic aragonite minerals with elongated needle shapes were found to be the major constituent of the soil and dust samples. Temporal variability of the dust characteristics and their elemental correlation to dust sources revealed that while dust source 1 (DS₁) with higher clay, salt, and silt contents contribute more to the dust composition from July to August (<em>R</em>² &gt; 0.75 for DS₁ versus <em>R</em>² &gt; 0.58 for DS₂), dust source 2 (DS₂) with less salinity and higher sand content becomes the major contributor to dust composition from October to November (<em>R</em>² &gt; 0.91 for DS₂ versus <em>R</em>² &gt; 0.75 for DS₁). Results of stabilizing both DS₁ and DS₂ showed that SA-induced crusts on DS₁ are more stable than DS₂ due to the presence of higher clay, silt, salt, organic matter, and lower aragonite minerals. SA-induced crusts by a compaction method significantly performed better than a spray of SA on either dry (DSp) or soil at its optimum water content (WSp) at all concentrations. Nevertheless, spray methods are more feasible at the field scale and in both DSp and WSp methods, SA_0.5 improved the crust thickness. Scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDX) along with thermogravimetric analysis (TGA) confirmed the remaining SA on the soil surface three months after its application indicating the effective performance of the SA solution in sand sheets stabilization. Hence, its application at the field scale could possibly reduce aerosol release and transport to surrounding areas.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"39 3","pages":"Pages 355-374"},"PeriodicalIF":3.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000386/pdfft?md5=5e37c19304de4ff11ae48bf8dd7bfa5d&pid=1-s2.0-S1001627924000386-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140842420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unraveling the sources of organic matter in suspended particulates and sediment in a closed inland lake using stable isotope fingerprinting","authors":"Xiaohui Ren ,&nbsp;Ruihong Yu ,&nbsp;Jianfang Kang ,&nbsp;Rui Wang ,&nbsp;Xiangwei Li ,&nbsp;Dalun Wang ,&nbsp;Pengxuan Zhang","doi":"10.1016/j.ijsrc.2024.04.004","DOIUrl":"10.1016/j.ijsrc.2024.04.004","url":null,"abstract":"<div><p>Suspended particulates and sediment are significant reservoirs of organic matter (OM) in lakes, and tracking the formation of suspended particulate organic matters (SPOMs) and sediment organic matters (SOMs) is the key to understanding the environmental behavior of OM and the carbon cycling of lake ecosystems. However, few studies have simultaneously focused on the sources of SPOM and SOM in closed inland lakes to reveal their differences and implications for water quality. The current study investigated the sources of SPOM and SOM in Daihai Lake, a typical closed inland lake in northern China, based on stable carbon (δ¹³C) and nitrogen (δ¹⁵N) isotopic compositions, during spring, summer, and autumn. The results showed that δ¹³C_POC and δ¹⁵N_PN (where POC and PN denote particulate organic carbon and nitrogen, respectively) of SPOM varied from −30.99‰ to −21.71‰ and 1.43‰–9.47‰, respectively. SPOM mainly originated from sewage, soil, and phytoplankton, with average contributions of 29.5%, 27.7%, and 19%, respectively, and each source of SPOM showed low spatial variation. However, the contribution of phytoplankton showed a decreasing trend from spring to summer, while the contribution of soil showed the opposite change. δ¹³C_TOC and δ¹⁵N_TN (where TOC and TN denote total organic carbon and nitrogen, respectively) of SOM varied from −26.41‰ to −23.99‰ and 3.3‰–7.66‰, respectively. Soil and sewage were the major sources of SOM, with average contributions of 43.3% and 27.8%, respectively, and each source showed small temporal and spatial variations. The differences between sources of SPOM and SOM revealed that phytoplankton-derived SPOM was easily degraded, whereas sewage- and soil-derived SPOM tended to deposit in the lake sediment. Additionally, the impact of SPOM on water quality significantly exceeded that of SOM. The source characteristics of SPOM were correlated with eutrophication and salinity indicators in the water, which have important implications for water quality. This isotopic evidence revealed that exogenous inputs were the main sources of OM in closed inland lakes, but there were some differences in the source characteristics between SPOM and SOM.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"39 3","pages":"Pages 421-434"},"PeriodicalIF":3.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000404/pdfft?md5=54c8efdd40d23177f410b59ec671f98d&pid=1-s2.0-S1001627924000404-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}