24年11月19日文献情报（8篇）

24年11月19日文献情报

1. 题目: Photochemistry of microplastics-derived dissolved organic matter: Reactive species generation and organic pollutant degradation

文章编号: N24111908
期刊: Water Research
作者: Jie Zhang, Xianfeng Hou, Kena Zhang, Quanzhi Xiao, Jorge L Gardea-Torresdey, Xiaoxia Zhou, Bing Yan
更新时间: 2024-11-19
摘要: Dissolved organic matter (DOM) originating from microplastics (MPs-DOM) is increasingly recognized as a substantial component of aquatic DOM. The photochemistry of MPs-DOM, essential for understanding its environmental fate and impacts, remains largely unexplored. This study investigates the photochemical behaviors of MPs-DOM derived from two common plastics: polystyrene (PS) and polyvinyl chloride (PVC), which represent aromatic and aliphatic plastics, respectively. Spectral and high-resolution mass spectrometry analyses demonstrated that photoreactions preferentially targeted poly-aromatic compounds within the MPs-DOM, leading to degradation products that predominantly form N-aliphatic/lipid-like substances. This transformation is characterized by decreased aromaticity and unsaturation. Additionally, irradiation of MPs-DOM generated reactive species (RS), including triplet intermediates (³DOM*) and singlet oxygen (¹O₂), with apparent quantum yields of 0.06–0.16% and 0.16–0.35%, respectively—values considerably lower than those for conventional DOM (1.19–1.56% for ³DOM* and 1.34–1.90% for ¹O₂). Despite this, the RS generated from MPs-DOM significantly enhance the degradation of coexisting organic pollutants, such as antibiotic resistance genes (ARGs). The findings shed light on the photoinduced transformation of MPs-DOM and suggest that MPs-DOM functions as a natural photocatalyst, mediating redox reactions of pollutants in sunlit aquatic settings. This highlights its previously underestimated role in natural attenuation and aquatic photochemistry.
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2. 题目: Exploration of nitrogen sources and transformation processes in eutrophic estuarine zones based on DOM and stable isotope compositions

文章编号: N24111907
期刊: Marine Pollution Bulletin
作者: Xiujian Hu, Shengwei Cao, Mengtuo Wen, Yuanjing Zhang, Yuewen Zhao, Yaci Liu, Xiangke Kong, Yasong Li
更新时间: 2024-11-19
摘要: Our study examines nitrogen sources and transformations in Xiamen Bay, where eutrophication has increased due to higher nitrogen levels. By analyzing dissolved organic matter (DOM) and nitrate stable isotopes (δ¹⁵N-NO3⁻and δ¹⁸O-NO3⁻), the study finds that nitrate in low salinity areas is influenced by freshwater-seawater mixing and biogeochemical processes, while in high salinity areas, it is mainly affected by physical mixing. Bayesian mixing model (MixSIAR) results show that the primary nitrate sources are fecal matter and sewage, followed by atmospheric deposition. During the high flow period, DOM may facilitate nitrogen transformation and release through processes such as degradation or mineralization. In contrast, during the low flow period, the system is mainly influenced by the physical mixing of saline and freshwater. Studies have shown that DOM can indicate the biogeochemical intensity in water bodies, further identifying the main factors influencing the distribution and transformation processes of nitrate content, providing a basis for mitigating eutrophication in estuarine areas.
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3. 题目: Diel dissolved organic matter patterns reflect spatiotemporally varying sources and transformations along an intermittent stream

文章编号: N24111906
期刊: Limnology and Oceanography
作者: Rebecca L Hale, Sarah E Godsey, Jenna M Dohman, Sara R Warix
更新时间: 2024-11-19
摘要: Stream dissolved organic matter (DOM) is a globally important carbon flux and a locally important control on stream ecosystems, and therefore understanding controls on stream DOM fluxes and dynamics is crucial at both local and global scales. However, attributing process controls is challenging because both hydrological and biological controls on DOM are integrated and may vary over time and throughout stream networks. Our objective was to assess the patterns and corresponding controls of diel DOM cycles through a seasonal flow recession by using reach‐scale in situ sensors in a non‐perennial stream network. We identified five characteristic diel variations in DOM with differing phase and amplitude. During snowmelt flows, diel variations in DOM were consistent among sites and reflected diel flowpath shifts and photodegradation. Evapotranspiration‐driven diel stage oscillations emerged at two upstream sites, shaping diel DOM patterns indirectly, by creating conditions for instream DOM processing. At a spring‐fed site, minimal diel variation was observed throughout the summer whereas at an intermittent reach, daily drying and rewetting created biogeochemical hot moments. This research demonstrates that controls on DOM vary over time and space, even in close proximity, generating asynchronous fDOM patterns during low flows, illuminating shifts in biogeochemical processes and flowpaths.
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4. 题目: Nitrogen mineralization/immobilization dynamics across the river-estuary-sea continuum: Effects of organic matter and microorganisms

文章编号: N24111905
期刊: Marine Pollution Bulletin
作者: Hengchen Wei, Peiyi Wang, Jing Li, Qingyan Wang, Fengwei Zhang, Dongyao Sun, Dengzhou Gao, Zhuhong Ding, Wei Du, Guoling Zhang, Xianbiao Lin
更新时间: 2024-11-19
摘要: N mineralization and immobilization are important N cycling pathways. While they are widely studied in individual coastal habitats, they are rarely compared across different habitats along the river-estuary-sea continuum. We addressed this gap by investigating gross nitrogen mineralization (GNM) and gross ammonium immobilization (GAI) in urban rivers, estuary, and adjacent sea of the Yangtze River-Estuary-East China Sea system. We sampled 30 stations during winter and summer, quantifying GNM and GAI rates using enriched ¹⁵N stable isotopes. We observed a 65 % decrease in total organic C concentrations and a three-fold increase in fungi/bacteria ratios from river to sea. Along the gradient, GNM decreased from 5.41 to 2.41 μg N g⁻¹ d⁻¹ and GAI decreased from 6.08 to 3.27, with their ratios generally >1, indicating nitrogen limitation. Redundant analyses identified temperature and Fe as significant environmental variables. This study highlights the importance of cross-habitat comparisons to N cycling studies in coastal systems.
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5. 题目: Enhanced soil carbon storage and arbuscular mycorrhizal fungal biomass in a long-term nutrient management under soybean-based cropping system

文章编号: N24111904
期刊: Environmental Science and Pollution Research
作者: Richa Agnihotri, Ashu Pandey, Mahaveer P Sharma, Anil Prakash, Aketi Ramesh, Hemant Singh Maheshwari, Rakesh Kumar Verma, Raghvendra Nargund, Sunil Datt Billore
更新时间: 2024-11-19
摘要:

To ensure the sustainability of crop production and ecosystem functioning, a thorough understanding of the mechanisms governing soil carbon (C) sequestration and soil health is essential. This study examined the effects of three nutrient management practices (organic, inorganic, and integrated) and two cropping systems (soybean-wheat and soybean-chickpea), on arbuscular mycorrhizal fungi (AMF) and soil C-sequestration in a long-term (12 years) field experiment. We measured the stocks of soil organic carbon, total glomalin–related soil protein, pertinent soil quality parameters such as microbial biomass carbon, and β-glucosidase activity along with AMF biomass [microscopic parameters and 16:1ω5cis phospholipid fatty acid (AM PLFA) and neutral lipid fatty acid (AM NLFA)]. It was observed that the measures of AMF biomass were positively correlated with the soil organic carbon stocks, total glomalin–related soil protein stocks, and soil quality parameters. Organic practice recorded significantly higher AMF spores, mycorrhizal colonization percentage, AM PLFA (2.58 nmol g⁻¹ soil), AM NLFA (7.95 nmol g⁻¹ soil), soil organic carbon stocks (15.78 Mg ha⁻¹), total glomalin–related soil protein stocks (2.10 Mg ha⁻¹), and soil quality parameters such as microbial biomass carbon, and β-glucosidase activity than inorganic and integrated practices. In comparison to soybean-chickpea, C-sequestration was higher in soybean-wheat. Principal component analysis validated the said results and differentiated soybean-wheat under organic practice from the rest of the treatments. In conclusion, our results suggest that organic management in conjunction with soybean-wheat crop rotation enhances AMF and can be recommended for improving soil quality and C sequestration without compromising crop yield.

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6. 题目: Simulated erosion of A horizon influences the dissolved organic matter chemodiversity and carbon sequestration of B horizon in Mollisols

文章编号: N24111903
期刊: Soil Biology and Biochemistry
作者: Meng Zhou, Yang Xiao, Yansheng Li, Jian Liu, Yueyu Sui, Xingyi Zhang, Xiaobing Liu
更新时间: 2024-11-19
摘要: Erosion of the A horizon of Mollisols is expected to change the dissolved organic matter (DOM) chemodiversity in the underlying B horizon. Three simulated erosion treatments, which had an A horizon of 30, 20, and 10 cm depth, were established for 9 years under a corn-soybean rotation on Mollisols. Compared to the A horizon that was 30 cm deep, the 20 cm treatment had 24–63% more dissolved lignin-like compounds, a significant increase, in the 0–10, 10–20, and 20–30 cm layers of the B horizon. When the A horizon was 10 cm deep, 41% more lignin-like compounds accumulated in the 10–20 cm layer of the B horizon and 22% more lignin-like compounds were detected in the 20–30 cm layer of the B horizon. Relative to the A horizon of 30 cm depth, the 20 and 10 cm treatments reduced the lipid- and protein-like compounds by 69–87% in 10–20 and 20–30 cm layers of the B horizon layers. Labile compounds increased in the 0–10 cm layer of the B horizon but decreased in the 10–20 and 20–30 cm layers of the B horizon. The DOM degradation degree, expressed in terms of the degradation index and Gibbs free energy, were related to the lignin accumulation, indicating that lignin, a recalcitrant compound, was degraded. Notably, variations in DOM chemodiversity in eroded Mollisols were primarily controlled by soil physicochemical properties and not microbial traits. Therefore, eroded Mollisols have less carbon sequestration potential in the B horizon. To prevent soil deterioration in corn-soybean rotations, we recommend to incorporate a combination of organic and mineral fertiliser to a 20–30 cm soil depth in erosion-susceptible Mollisols.
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7. 题目: Ocean liming effects on dissolved organic matter dynamics

文章编号: N24111902
期刊: Biogeosciences
作者: Chiara Santinelli, Silvia Valsecchi, Simona Retelletti Brogi, Giancarlo Bachi, Giovanni Checcucci, Mirco Guerrazzi, Elisa Camatti, Stefano Caserini, Arianna Azzellino, Daniela Basso
更新时间: 2024-11-19
摘要: . Ocean liming has gained attention as a potential solution to mitigate climate change by actively removing carbon dioxide (CO2) from the atmosphere. The addition of hydrated lime to oceanic surface water leads to an increase in alkalinity, which in turn promotes the uptake and sequestration of atmospheric CO2. Despite the potential of this technique, its effects on the marine ecosystem are still far from understood, and there is currently no information on the potential impacts on the concentration and quality of dissolved organic matter (DOM), which is one of the largest, most complex and yet least understood mixtures of organic molecules on Earth. The aim of this study is to provide the first experimental evidence about the potential effects of hydrated lime addition on DOM dynamics in the oceans by assessing changes in its concentration and optical properties (absorption and fluorescence). To investigate the effects of liming on DOM pools with different concentrations and quality, seawater was collected from two contrasting environments: the oligotrophic Mediterranean Sea, known for its dissolved organic carbon (DOC) concentration comparable to that observed in the oceans, and the eutrophic Baltic Sea, characterized by high DOM concentration mostly of terrestrial origin. Hydrated lime was added to both waters to reach pH values of 9 and 10. Our findings reveal that the addition of hydrated lime has a noticeable effect on DOM dynamics in both the Mediterranean Sea and Baltic Sea, determining a reduction in DOC concentration and a change in the optical properties (absorption and fluorescence) of DOM. These effects, detectable at pH 9, become significant at pH 10 and are more pronounced in the Mediterranean Sea than in the Baltic Sea. These potential short-term effects should be considered within the context of the physicochemical properties of seawater and the seasonal variability.
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8. 题目: Maize and soybean rotation benefits soil quality and organic carbon stock.

文章编号: N24111901
期刊: Journal of Environmental Management
作者: Bolun Luo, Jie Zhou, Wei Yao, Yuxian Wang, Thomas Guillaume, Ming Yuan, Dongwei Han, Nataliya Bilyera, Lianxia Wang, Lei Zhao, Yadong Yang, Zhaohai Zeng, Huadong Zang
更新时间: 2024-11-19
摘要: Soybean and maize rotation has been recommended as a promising strategy to maximize crop yield. However, the impacts of soybean-maize rotation, and particularly the frequency of soybean inclusion, on soil quality and carbon (C) stock need to explored. We conducted an 8-year field experiment of randomized design in Northeast China with four cropping systems as continuous soybean (S), continuous maize (M), soybean-maize rotation (SM), and soybean-maize-maize rotation (SMM). The results showed that the soil quality index, soil ecosystem multifunctionality (EMF), and C stock under crop rotation (SM and SMM) were 5.4-23.5%, 13.1-22.6%, and 9.3-29.4% higher than those under continuous cropping (M and S), respectively. Additionally, the increased frequency of soybean in the rotation increased soil EMF by 14.8% due to higher soil enzyme activities and available N. Notably, the soybean-maize rotation alleviated microbial nitrogen (N) limitation compared to continuous cropping, due to stimulated C, N, and P acquisition by enzyme activities. Furthermore, the soil quality index correlated positively with C stock in the topsoil. The accumulation rates of soil organic C and total N were higher by 0.39 and 0.14 g kg-1 year-1 in SMM than in SM, respectively. Therefore, scientifically based soybean frequency is an effective approach to enhance soil organic C in soybean and maize rotation. In conclusion, soybean-maize rotation improves soil quality compared to monoculture, and a reduced frequency of soybean within the rotation (SMM) is beneficial for C and N storage.
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