24年11月3日文献情报（16篇）

24年11月3日文献情报

1. 题目: Waste Nitrogen Upcycling to Amino Acids during Anaerobic Fermentation on Biochar: An Active Strategy for Regulating Metabolic Reducing Power

文章编号: N24110316
期刊: Environmental Science & Technology
作者: Yanfei Tang, Eakalak Khan, Daniel C W Tsang
更新时间: 2024-11-03
摘要: This study proposes a novel strategy that utilizes biochar (BC) during anaerobic fermentation (AF) to generate amino acids (AAs) toward nitrogen upcycling. The BC, pyrolyzed at 800 °C (BC800) to enhance graphite structures and electron-accepting sites, effectively addresses issues related to biosynthetic reducing power nicotinamide adenine dinucleotide phosphate insufficiency by altering cellular conditions and alleviates feedback inhibition through the immobilization of end products. This process establishes unique microbial signaling and energy networks, with Escherichia coli becoming dominant in the biofilm. The conversion rate of ammonia-N to AAs-N within the biofilm reached 67.4% in BC800-AF, which was significantly higher compared to the levels in other AF reactors with BC pyrolyzed at 600 and 400 °C (45.9 and 22.5%, respectively), as well as a control AF reactor (<5%). Furthermore, in BC800-AF, the aromatic AAs (Aro-AAs) were as high as 70.8% of the AAs within the biofilm. The activities of key enzymes for Aro-AAs biosynthesis uniquely positively correlated with the electron-accepting capacity on BC800 (R² ≥ 0.95). These findings hold promise for transforming existing AF reactors into factories that produce BC-based AAs, providing a more sustainable fertilizing agent than chemical fertilizers.
文章二维码:

2. 题目: U(VI) mitigation from contaminated groundwater using γ-alumina coated SiC ceramic microporous membrane

文章编号: N24110315
期刊: Separation and Purification Technology
作者: Mohit Verma, Nilanjan Santra, Vijay A Loganathan, Nijhuma Kayal
更新时间: 2024-11-03
摘要: In this study, we have focussed on elucidating uranium adsorption mechanism on to a novel γ-alumina coated SiC ceramic microporous membrane using surface complexation modelling (SCM) approach. The effect of contact time had no impact on U(VI) removal as adsorption by nanoporous γ-alumina was instantaneous, which was also confirmed using batch adsorption kinetic experiments. γ-alumina coated at 4.5 mg·cm⁻² was able to treat 173 L of U(VI) contaminated water having 200 μg of U L⁻¹ with 1 m² of membrane surface area. Varying the pH of aqueous solution containing U(VI) from pH 4.0 to 10.0, showed significant changes in uranium uptake by the composite membrane with maximum U(VI) removal occurring at pH 5.5. The adsorption mechanism of uranium onto γ-alumina was explained through formation of bidentate surface complexes (i.e. (SOH)₂UO₂CO₃⁻, (SOH)₂UO₂⁺, and (X)₂UO₂). The results of SCM predicted the batch pH edge experiment within a root mean square error of 0.04. Among various co-ions added along with U(VI), calcium, magnesium, and salinity reduced U(VI) removal whereas phosphate resulted in increased U(VI) removal. The presence of dissolved organic matter (DOM) reduced U(VI) removal due to lack of adsorption between U(VI)-DOM complexes and the membrane surface.
文章二维码:

3. 题目: The Interplay of Brown Carbon (BrC) Surrogates and Copper: Implications for the Oxidative Potential of Ambient Particles

文章编号: N24110314
期刊: Journal of Hazardous Materials
作者: Danni Wu, Haonan Wu, Yan Lyu, Huiying Zhang, Jiade Wang, Xiang Li, Xiaobing Pang
更新时间: 2024-11-03
摘要: Atmospheric particulate matter (PM) poses adverse effects on human via producing reactive oxygen species (ROS). Oxidative potential (OP, ability to generate ROS) can be induced by various chemicals in PM, while their interplay remains poorly characterized. Here, we systematically assessed influences of Cu²⁺ on OP of Brown carbon (BrC) (e.g., imidazoles) using dithiothreitol (DTT) assay. Results showed DTT consumption rate exhibited an initial rise and later decline (0.25−0.56 µM/min) along with increase of BrC concentration (0.1− 2 µM), while no general trend was observed for ^•OH formation. Although Cu²⁺ showed either antagonism or synergism with BrC against DTT consumption, Cu²⁺ displayed antagonism with most BrC against ^•OH generation. Fluorescence quenching experiments provided evidence of complexation between Cu²⁺ and water-soluble organic compounds (WSOCs, from ambient PM_2.5), which was influenced by Cu²⁺ concentration. Further parallel factor analysis of spectra showed that polycarboxylate-type humic acid-like substances (complexation site number (n): 0.46, complexation equilibrium constant (k): 0.51) and fulvic acid-like compounds (n: 0.42, k: 0.62) were the main components in WSOCs that complexed with Cu²⁺. Our results suggest the interactions of BrC and copper play a crucial role in PM OP and highlight complexation in evaluation of PM OP.
文章二维码:

4. 题目: The addition of humic acid into soil contaminated with microplastics enhanced the growth of black gram (Vigna mungo L. Hepper) and modified the rhizosphere microbial community

文章编号: N24110313
期刊: Environmental Science and Pollution Research
作者: Vignesh Ragavendran Ajithadoss Virachabadoss, Merline Sheela Appavoo, Kumara Sashidara Paramasivam, Sri Vishnu Karthikeyan, Dhinagaran Govindan
更新时间: 2024-11-03
摘要:

Microplastics have polluted agricultural soils, posing a substantial risk to crop productivity. Moreover, the presence of microplastic pollution has caused a disturbance in the composition of the microbial community in the soil surrounding plant roots, therefore impacting the growth of beneficial bacteria. A study was conducted to examine if humic acid (HA) can counteract the harmful effects of microplastics (MPs) on the growth of black gram crops and the composition of the rhizosphere soil microbial community, to reduce the negative impacts of microplastics on these microorganisms and crops. The research was carried out using mud pots and the plastic utilized for the experiment consisted of 60% high-density polyethylene (HDPE) and 40% polypropylene (PP). The soil was enriched with lignite-based potassium humate, which had a pH range of 8.0–9.5 and with 65% humic acid. The experiment consisted of six treatments: T1, which served as the control without HA and MP; T2, which involved the use of HA at a concentration of 0.15% w/w; T3, which involved the use of MP at a concentration of 0.2% w/w; T4, which involved the use of MP at a concentration of 0.4% w/w; T5, which involved the combination of HA at a concentration of 0.15% w/w and MP at a concentration of 0.2% w/w; and T6, which involved the combination of HA at a concentration of 0.15% w/w and MP at a concentration of 0.4% w/w. The plant growth characteristics, including germination percentage, nodule number, and chlorophyll content, were measured. In addition, the DNA obtained from the rhizosphere soil was analyzed using metagenomics techniques to investigate the organization of the microbial population. Seedlings in soil polluted with MP exhibited delayed germination compared to seedlings in uncontaminated soil. Following 60 days of growth, the soil samples treated with T5 (0.2% MP and 0.15% HA w/w) had the highest population of bacteria and rhizobium, with counts 5.58 ± 0.02 and 4.90 ± 0.02 CFU g⁻¹ soil. The plants cultivated in T5 had the most elevated chlorophyll-a concentration (1.340 ± 0.06 mg g⁻¹), and chlorophyll-b concentration (0.62 ± 0.02 mg g⁻¹) while those cultivated in T3 displayed the lowest concentration of chlorophyll-a (0.59 ± 0.02 mg g⁻¹) and chlorophyll-b (0.21 ± 0.04 mg g⁻¹). Within the phylum, Proteobacteria had the highest prevalence in all treatments. However, when the soil was polluted with MPs, its relative abundance was reduced by 8.4% compared to the control treatment (T1). Conversely, treatment T5 had a 3.76% rise in relative abundance when compared to treatment T3. The predominant taxa found in soil polluted with MP were Sphingomonas and Bacillus, accounting for 19.3% of the total. Sphingomonas was the predominant genus (21.2%) in soil polluted with MP and supplemented with humic acid. Humic acid can be used as a soil amendment to mitigate the negative effects of MPs and enhance their positive advantages. Research has demonstrated that incorporating humic acid into soil is a viable method for maintaining the long-term integrity of soil’s physical, chemical, and biological characteristics.

文章二维码:

5. 题目: Identifying and filling critical knowledge gaps can optimize financial viability of blue carbon projects in tidal wetlands

文章编号: N24110312
期刊: Frontiers in Environmental Science
作者: Tim J B Carruthers, S Beaux Jones, Megan K Terrell, Jonathan F Scheibly, Brendan J Player, Valerie A Black, Justin R Ehrenwerth, Patrick D Biber, Rod M Connolly, Steve Crooks, Jason P Curole, Kelly M Darnell, Alyssa M Dausman, Allison L DeJong, Shawn M Doyle, Christopher R Esposito, Daniel A Friess, James W Fourqurean, Ioannis Y Georgiou, Gabriel D Grimsditch, Songjie He, Eva R Hillmann, Guerry O Holm, Jennifer Howard, Hoonshin Jung, Stacy D Jupiter, Erin Kiskaddon, Ken W Krauss, Paul S Lavery, Bingqing Liu, Catherine E Lovelock, Sarah K Mack, Peter I Macreadie, Karen J McGlathery, J Patrick Megonigal, Brian J Roberts, Scott Settelmyer, Lorie W Staver, Hilary J Stevens, Ariana E Sutton-Grier, Jorge A Villa, John R White, Michelle Waycott
更新时间: 2024-11-03
摘要: One of the world’s largest “blue carbon” ecosystems, Louisiana’s tidal wetlands on the US Gulf of Mexico coast, is rapidly being lost. Louisiana’s strong legal, regulatory, and monitoring framework, developed for one of the world’s largest tidal wetland systems, provides an opportunity for a programmatic approach to blue carbon accreditation to support restoration of these ecologically and economically important tidal wetlands. Louisiana’s coastal wetlands span ∼1.4 million ha and accumulate 5.5–7.3 Tg yr⁻¹ of blue carbon (organic carbon), ∼6%–8% of tidal marsh blue carbon accumulation globally. Louisiana has a favorable governance framework to advance blue carbon accreditation, due to centralized restoration planning, long term coastal monitoring, and strong legal and regulatory frameworks around carbon. Additional restoration efforts, planned through Louisiana’s Coastal Master Plan, over 50 years are projected to create, or avoid loss of, up to 81,000 ha of wetland. Current restoration funding, primarily from Deepwater Horizon oil spill settlements, will be fully committed by the early 2030s and additional funding sources are required. Existing accreditation methodologies have not been successfully applied to coastal Louisiana’s ecosystem restoration approaches or herbaceous tidal wetland types. Achieving financial viability for accreditation of these restoration and wetland types will require expanded application of existing blue carbon crediting methodologies. It will also require expanded approaches for predicting the future landscape without restoration, such as numerical modeling, to be validated. Additional methodologies (and/or standards) would have many common elements with those currently available but may be beneficial, depending on the goals and needs of both the state of Louisiana and potential purchasers of Louisiana tidal wetland carbon credits. This study identified twenty targeted needs that will address data and knowledge gaps to maximize financial viability of blue carbon accreditation for Louisiana’s tidal wetlands. Knowledge needs were identified in five categories: legislative and policy, accreditation methodologies and standards, soil carbon flux, methane flux, and lateral carbon flux. Due to the large spatial scale and diversity of tidal wetlands, it is expected that progress in coastal Louisiana has high potential to be generalized to similar wetland ecosystems across the northern Gulf of Mexico and globally.
文章二维码:

6. 题目: Understanding and estimating the role of large-scale seaweed cultivation for carbon sequestration on a global scale over the past two decades.

文章编号: N24110311
期刊: Science of the Total Environment
作者: Hongtian Luo, Jinling Li, Songguang Xie, Yufeng Yang
更新时间: 2024-11-03
摘要: Seaweeds, as marine photosynthetic organisms, are harvested by humans from the wild or through cultivation for various production purposes and to provide a range of marine ecosystem services, including nutrient removal, oxygen production, and carbon sequestration. The potential use of cultivated seaweed in mitigating carbon dioxide (CO2) has been extensively proposed in conjunction with commercial seaweed production worldwide. This study aims to assess the annual potential and benefits of cultivated seaweed in reducing and fixing anthropogenic CO2. Over the past two decades (2000-2019), global seaweed production has seen significant growth. The total output of cultivated seaweed reached 407.4 × 107 tons (t), with coastal mariculture removing 4.26 × 107 t of carbon annually and wild capture removing 2.24 × 106 t. The recalcitrant dissolved organic carbon (RDOC, 549.88-621.60 × 104 t) plays a significant role in the carbon sinks of seaweed cultivation. The substantial benefits of carbon sink resulting from the formation of RDOC from seaweed make up a considerable proportion in the calculation of carbon sequestration and sink enhancement benefits in large-scale seaweed cultivation. The sizable carbon sink base of seaweed cultivation (8631.90-9567.37 × 104 t) results in significant carbon fixation benefits. The total economic value of carbon sequestration and oxygen production was estimated at $70.36 ± 1.52 billion, with an annual average benefit of $3.52 ± 1.70 billion. Increasing the area and yield available for cultivated seaweed has the potential to enhance biomass production, carbon accumulation, and CO2 drawdown. It is crucial to emphasize the need for improved communication regarding the essential criteria for the feasibility of CO2 removal (CDR), with a focus on conducting life cycle assessments (LCA) when utilizing marine processes in the present and future work. The sustainable development of the seaweed cultivation industry not only ensures that Asian-Pacific countries remain leaders in this field but also provides an effective yet overlooked solution to excessive CO2 emissions worldwide.
文章二维码:

7. 题目: Adsorption - Advanced oxidation process (AAOP) for the heavy metals and organic matter removal from leachate using combined filtration -Fenton's and Photo-Fenton's treatment.

文章编号: N24110310
期刊: Journal of Environmental Management
作者: Bhaskar S, Rashmi Shree K N, Apoorva K V, Sreenivasa M Y
更新时间: 2024-11-03
摘要: Design of cost - effective filtration unit was carried out to evaluate the efficiency of different filter media made of locally available materials to treat raw leachate. Four different filter media laterites, peat, bagasse and a mixture of all were considered as study filter media for the removal of Zinc, Nickel, Copper and Lead from raw leachate. The reactor exhibited a significant removal efficiency when the three-filter media were combined as a combination. A removal rate of around 83.0% and 64.12% was found for nickel and copper, respectively, with a combined filter medium. The order of heavy metal removal varied depending on the kind of filter media used. For combined filter media, the sequence was Ni > Cu > Pb > Zn. For bagasse filter media, it was Pb > Cu > Zn > Ni. For peat filter media, it was Ni > Cu > Pb > Zn. For laterite filter media, it was Zn > Cu > Ni > Pb. Insignificant removal of heavy metals was observed with bagasse in the current investigation and hence is not recommended for use as a filter medium. Pre-treated leachate was subjected to Fenton's oxidation and UV-Fenton's oxidation for organic matter removal. Green synthesized bleached laterite iron nanoparticles were used as a catalyst in the Fenton treatment. COD removal of 80.0% and 85.0% was observed with 0.5 g/L of nano iron catalyst and 500 mg/L of H2O2 and 100 mg/L of H2O2 on Fenton's oxidation and UV-Fenton's oxidation respectively. The synthesized particles were demonstrated to possess a catalytic function in the reduction of COD. Both Fenton's oxidation and UV-Fenton's oxidation exhibit pseudo-first-order kinetics with linear regression.
文章二维码:

8. 题目: The interplay between external residue addition, and soil organic carbon dynamics and mineralization kinetics: Experiences from a 12-year old conservation agriculture.

文章编号: N24110309
期刊: Journal of Environmental Management
作者: Priyanka Saha, T K Das, Suman Sen, Prabhu Govindasamy, Raj Singh, Rishi Raj, Dibakar Mahanta, M C Meena, Arti Bhatia, Livleen Shukla, Abir Dey, Bappa Paramanik, Arkaprava Roy, Alekhya Gunturi, Tarun Sharma
更新时间: 2024-11-03
摘要: Maintaining soil carbon is vital under changing climate. Conservation agriculture (CA) is reported to have potential to store soil organic carbon (SOC). The impact of carbon inputs on SOC dynamics and mineralization kinetics, and the priming effect of residue addition under long-term CA in subtropical regions, however, are not clear or adequately evaluated. Therefore, we studied these under a 12-year-old CA-based pigeon pea-wheat cropping system with permanent broad bed with residue (CA-PBB), permanent flatbed with residue (CA-PFB), permanent narrow bed with residue (CA-PNB), and conventional till (CT) treatments. Also, an incubation study was undertaken to understand better the processes involved. Results showed that CA treatments significantly enhanced the total SOC compared to CT practice, and, among them, the CA-PFB exhibited highest total SOC with 36.6% and 35.8% higher values at 0-5 and 5-15 cm depths, respectively. The CA-PFB followed by CA-PBB and CA-PNB had significantly higher carbon management index and carbon retention efficiency than CT. The CA-PFB also showed higher carbon sequestration rates of 68.4 and 188.8 kg ha-1 year-1, surpassing values of 8.4 and 52.9 kg ha-1 year-1 under CT at 0-5 and 5-15 cm depth, respectively. Furthermore, soil incubation study revealed that the CA systems had higher cumulative mineralization values at 0-5 cm soil layer but lower at 5-15 cm soil compared to CT, indicating a considerable improvement in SOC at 5-15 cm soil depth. On the contrary, the SOC decay rate was higher under CA than CT, and at 35 °C than at 15 °C. A positive priming effect was also observed, depending on the substrate type, pigeon pea residue exhibiting higher priming effect than wheat residue. Thus, these studies show that residue input increases cumulative mineralization and SOC decay rate vis-à-vis helps to sequester carbon in the recalcitrant fraction, leading to higher stable carbon in soil.
文章二维码:

9. 题目: Effect of Low-molecular-weight Organic Acids on the Transport of Polystyrene Nanoplastics in Saturated Porous Media

文章编号: N24110308
期刊: Journal of Hazardous Materials
作者: Lan Wu, Jing Yin, Wenbing Wu, Kejing Pang, Huimin Sun, Xianqiang Yin
更新时间: 2024-11-03
摘要: Low molecular weight organic acids (LMWOAs) are extensively present as soluble organic matter in the environment, potentially influencing the transport of polystyrene nanoplastics (PSNPs) in soil and groundwater environments. In this study, we studied the impact of three LMWOAs (Acetic Acid (AA), Malic Acid (MA), and Citric Acid (CA)) on PSNPs migration under varied pH and Ionic Strength (IS) conditions in the saturated porous medium. The results demonstrated that the low LMWOAs concentrations (0.0001 mol L^-1) promoted PSNPs migration rate, while high concentrations (0.001, 0.01 mol L^-1) reduced the migration rate and increased the deposition. Due to the different relative molecular weights and number of functional groups of different LMWOAs, the order of promoting (0.0001 mol L^-1) /inhibiting (0.001, 0.01 mol L^-1) effects of LMWOAs on PSNPs migration rate under various physicochemical conditions in this study was AA < MA < CA. The decrease in IS and increase in pH promoted the migration of PSNPs. Electrostatic repulsion and spatial potential resistance affected PSNPs migration. This study offers theoretical support for the understanding of migration patterns and mechanisms of nanoparticles in soil-water environments.
文章二维码:

10. 题目: Capturing differences in the release potential of dissolved organic matter from biochar and hydrochar: Insights from component characterization and molecular identification.

文章编号: N24110307
期刊: Science of the Total Environment
作者: Rongting Ji, Yiting Yang, Yudong Wu, Changyin Zhu, Ju Min, Chenwei Liu, Longjiang Zhang, Hu Cheng, Jianming Xue, Dongmei Zhou
更新时间: 2024-11-03
摘要: Biochar and hydrochar have garnered widespread attention owing to their excellent performance in environmental remediation, carbon sequestration, and resource utilization from biowaste. Studies on the release potential of dissolved organic matter (DOM) have been limited, and the distinction between biochar and hydrochar remains unclear. In this study, pine sawdust was utilized as a model precursor with the aim of comparing the release quantity, components, and properties of DOM from biochar (BDOM) and hydrochar (HDOM) under various simulated conditions. The amount of DOM released by hydrochar (38.20-190.49 g/kg) was significantly greater than that released by biochar (0.57-11.96 g/kg), and more DOM was released at higher temperatures and pH values. BDOM consists of three categories of components, namely, humic-like, protein-like, and benzoic acid-like and tyrosine-like substances compounds, whereas HDOM consists of four categories of components, namely, two categories of humic-like compounds and two categories of protein-like compounds. By using ESI-FT-ICR-MS technology, 8586 compounds in BDOM and 6428 compounds in HDOM were identified. A total of 4665 unique compounds were found in BDOM, 1416 unique compounds were found in HDOM under alkaline release conditions, and HDOM contained more unique compounds than those found in other environments. CRAM/lignin-like compounds made up the majority of the released DOM and reached 31.01-65.35 % for BDOM and 54.79-73.05 % for HDOM. These findings revealed significant differences in the release potential of DOM from biochar and hydrochar, and further behavior research is needed to guide future applications of char materials in the environment and agriculture fields.
文章二维码:

11. 题目: Molecular-level insights into the leachates released from ultraviolet-aged biodegradable and conventional commercial microplastics and their mechanism of toxicity toward Chlorella pyrenoidosa.

文章编号: N24110306
期刊: Science of the Total Environment
作者: Wenbo Deng, Yajing Wang, Wenjuan Liu, Zihan Wang, Jinzhao Liu, Jian Wang
更新时间: 2024-11-03
摘要: Understanding the harmful effects of microplastics (MPs) and their derivatives is a priority in environmental study. However, the characteristics and toxic effects of leachates from MPs at the molecular-level remain unclear. Herein, two conventional commercial MPs [polystyrene (PS) and polyethylene (PE)] and two biodegradable commercial MPs [polylactic acid (PLA) and polybutylene adipate-co-terephthalate/PLA (PBAT/PLA)] were subjected to leaching under ultraviolet-irradiation, and their leachates were investigated. The results showed that the surface morphology of MPs increased in roughness after ultraviolet-irradiation treatment, especially for biodegradable MPs, meanwhile, the particle size of four MPs decreased in various degrees. The biodegradable MPs released several times more dissolved organic matter (DOM) and nano-plastic particles than conventional MPs. Fourier transform ion cyclotron resonance mass spectrometry revealed that lignin-like substances were the predominant component of MP-DOM, followed by protein- and tannin-like substances. The molecular composition and characteristics of the DOM varied significantly among MPs. Transcriptomic analysis showed that 737 and 1259 genes, respectively, were differentially expressed in Chlorella pyrenoidosa in PLA- and PBAT/PLA-MP leachate-treated groups compared with controls, more than in the PS (352) and PE (355) groups. These findings, verified by physiological and histopathological analyses, indicate that the leachates from the biodegradable MPs induced more damage to Chlorella pyrenoidosa than those from the conventional MPs. This is mainly attributed to far more DOM and nano-plastic particles containing in leachates of biodegradable MPs than these of conventional MPs. This study deepens our comprehension of the potential hazards of MP-leachates, and promotes the prudent use and disposal of plastic products.
文章二维码:

12. 题目: Bacterial necromass as the main source of organic matter in saline soils.

文章编号: N24110305
期刊: Journal of Environmental Management
作者: Jiashen Song, Hongyuan Zhang, Bahar Razavi, Fangdi Chang, Ru Yu, Xia Zhang, Jing Wang, Jie Zhou, Yuyi Li, Yakov Kuzyakov
更新时间: 2024-11-03
摘要: Soil salinity poses a major threat to crop growth, microbial activity, and organic matter accumulation in agroecosystems in arid and semiarid regions. The limitations of carbon (C) accrual due to salinity can be partly mitigated by the application of organic fertilizers. Although microorganisms are crucial for soil organic carbon (SOC) stabilization, the relationships between living and dead microbial C pools and the community features of SOC accrual in saline soils are not known. A two-year field experiment was conducted to examine the effects of organic fertilizers on the microbial regulatory mechanisms of C sequestration in saline soil (chloride-sulfate salinity). Compared to manure addition alone, manure plus commercial humic acid increased SOC stock by 11% and decreased CO2 emissions by 10%, consequently facilitated soil C sequestration. We explain these results by greater bacterial necromass formation due to the dominance of r-strategists with faster turnover rate (growth and death), as well as larger necromass stability as supported by the increased aggregate stability under the addition of humic acids with manure. Humic acids increased the abundance of bacterial phylum Proteobacteria (copiotrophs) and decreased Acidobacteria (oligotrophs) compared with straw, indicating that r-strategists outcompeted K-strategists, leading to bacterial necromass accumulation. With larger C/N ratio (88), straw increased leucine aminopeptidase to mine N-rich substrates (i.e., from necromass and soil organic matter) and consequently reduced SOC stock by 8%. The decreased salinity and increased organic C availability under straw with manure addition also led to a 13% higher CO2 flux compared with manure application alone. Thus, humic acids added with manure benefited to SOC accumulation by raising bacterial necromass C and reducing CO2 emissions.
文章二维码:

13. 题目: Perfluorobutanoic acid weakens the heterogeneous aggregation of microplastics and microalgae: Perspective from physicochemical properties, extracellular polymeric substances secretion and DLVO theory.

文章编号: N24110304
期刊: Science of the Total Environment
作者: Yue Li, Xiaoying Zheng, Zhilin Zhao, Wenfei Li, Yu Huang, Haidong He, Zongshuo Han, Jiaqing Tao, Tao Lin
更新时间: 2024-11-03
摘要: Microplastics (MPs) and per- and poly-fluoroalkyl substances extensively coexist in aquatic environments and potentially endanger organisms. Microalgae may decrease the effective concentration of pollutants via hetero-aggregation with MPs and adsorption of emerging contaminants. However, the potential influence of coexistent pollutants on hetero-aggregation of MPs and microalgae remains unknown. This study investigated the hetero-aggregation process involving different sizes of polystyrene (PS, 3.0 and 50.0 μm) with Chlorella sorokiniana (C. sorokiniana) in the presence or absence of perfluorobutanoic acid (PFBA) along settling experiments, scanning electron microscope, and Derjaguin-Landau-Verwey-Overbeek (DLVO) model. We found that the hetero-aggregation between C. sorokiniana and 3 μm PS was more pronounced than with 50 μm PS, while PFBA inhibited this process. ΔOD1 values (reflected hetero-aggregation level) for 3PS-cells and 50PS-cells were 0.189 and 0.087, respectively, and PFBA decreased these values to 0.134 and 0.033. Furthermore, extracellular polymeric substances, known as inducer of hetero-aggregation, increased by 14.33 % when exposed to 3 μm PS alone, whereas the co-exposure group showed a decrease of 4.52 % compared to 3PS-cells group. PFBA also significantly decreased the protein/polysaccharide ratios in both MPs sizes, reducing hetero-aggregation. DLVO theory revealed that microalgae lowered the energy barrier significantly, while PFBA elevated it, indicating that hetero-aggregation was inhibited by PFBA. This study provides new perspectives for pollutant removal and toxicity variation in aquatic environments.
文章二维码:

14. 题目: Aboveground plants influence heterogeneously soil organic carbon (SOC) and its labile fractions after mixed afforestation: Three afforestation types of Masson's pine in the Upper Yangtze River, China.

文章编号: N24110303
期刊: Science of the Total Environment
作者: Yongqi Xiang, Jingjie Yang, Zhongxuan Huang, Xin Zhang, Haotian Duan, Anwei Yu, Huiqin Yang, Chuan Fan, Gang Chen, Xianwei Li
更新时间: 2024-11-03
摘要: Mixed forests generally have a higher carbon sequestration potential than pure forests. However, the effects of different types of mixed afforestation on soil organic carbon (SOC) and its labile fractions still remain controversial. We examined the concentrations of each SOC labile fraction at 0-50 cm soil depth, understory plant communities, stand plant biomass and studied their integrated effects on soil carbon stocks in three types of Pinus massoniana afforestation: a monoculture (MPF), a mixed forest with Cunninghamia lanceolata (MCLMF), and a mixed forest with Liquidambar formosana (MLMF). The results showed that the SOC stocks, i.e., concentrations of SOC and its labile fractions, across soil depths in all three afforestation types decreased with soil depth and ranked in the following order: MCLMF > MPF > MLMF. The concentrations of SOC and its labile fractions displayed a significant positive correlation with the diversity and biomass of understory plants and a significant negative correlation with tree biomass. The MCLMF had the largest SOC stocks (83.45 ± 7.59 Mg ha-1) and the smallest aboveground plant biomass carbon stocks (85.2 ± 4.07 Mg ha-1), while those of the MLMF were the opposite (SOC stocks, 35.63 ± 4.47 Mg ha-1; plant biomass carbon stocks, 144.28 ± 1.19 Mg ha-1). The forest carbon stocks (comprising both SOC and plant biomass carbon pools) were ranked as MLMF > MCLMF > MPF. Our results revealed that the diversity and biomass of understory plants can improve the stocks of SOC and its labile fractions, whereas trees may weaken the role of understory plants. In this sense, the diversity and biomass of understory plants should be emphasized in the process of mixed afforestation, especially mixed broadleaf-conifer afforestation, to increase SOC sequestration.
文章二维码:

15. 题目: Controlling iron release and pathogenic bacterial growth in distribution pipes through nanofiltration followed by different disinfection methods

文章编号: N24110302
期刊: Journal of Hazardous Materials
作者: Xinyuan Yang, Xiurong Ju, Haibo Wang, Xiao Mi, Baoyou Shi
更新时间: 2024-11-03
摘要: There is increasing concern about discoloration problems and microbial risks in drinking water. Until recently, how to control iron release and pathogenic bacterial growth in distribution pipes has been a knowledge gap. In our study, nanofiltration removed 13.3% of lignins, 33.1% of tannins and 17.7% of proteins from dissolved organic matter (DOM). These DOM components were closely related to enzymes involved in the tricarboxylic acid (TCA) cycle. Therefore, nanofiltration followed by chlorine or chloramine disinfection inhibited the TCA cycle and induced lower adenosine triphosphate (ATP) and extracellular polymeric substance (EPS) production, resulting in reduced pathogenic bacterial growth. The number of Pseudomonas aeruginosa decreased to 7.43×10⁵ and 2.43×10⁵ gene copies/mL, respectively. Moreover, lower DOM concentrations increased the abundance of iron-reducing bacteria (IRBs) in the biofilm. IRBs can convert Fe(III) into Fe(II) through cellular c-type cytochromes, including CymA, MtrA, Cytc3, MacA, PpcA, and OcmB. The higher abundance of IRB and their cytochromes led to more Fe₃O₄ formation on the surface of the distribution pipes, resulting in lower iron release. The total iron concentration was 16.9 μg/L in the effluent of pipes treated with nanofiltration and chloramine disinfection. Therefore, nanofiltration followed by different disinfection methods, especially chloramine disinfection, effectively controlled iron release and pathogenic bacterial growth in distribution pipes. This study strongly contributes to maintaining the drinking water quality in distribution pipes.
文章二维码:

16. 题目: Simulated N deposition enhances recalcitrant POM occlusion in microaggregates within macroaggregates

文章编号: N24110301
期刊: Plant and Soil
作者: Yue Feng, Wei Chen, Shijie Han
更新时间: 2024-11-03
摘要:

Background and aims

Increased N availability transforms labile soil organic carbon (SOC) to recalcitrant SOC in N-limited forest soils under atmospheric N deposition. However, N-induced variation in SOC stability within aggregates is rarely studied. Thus, the mechanism of SOC sequestration in aggregates under N deposition was studied.

Methods

Soils from N-amended and adjacent forest fields were sampled and separated into macroaggregates, free microaggregates and silt and clay (SC) fractions. The microaggregates (mM), coarse particulate organic matter (cPOM), fine particulate organic matter (fPOM-mM and fPOM-m) and SC fractions (SC-M, SC-mM and SC-m) occluded in aggregates were further separated. Their fraction masses, carbon concentrations and lignin indexes were determined.

Results

The fraction masses of 1–2 mm macroaggregates, mM, SC-M, fPOM-mM and SC-mM increased with fragmentation of 2–8 mm macroaggregates under N addition. The carbon contents in mM, SC-M and SC-mM also increased with increasing mass. Nitrogen addition caused distinct lignin loss in the occluded SC fractions. Lignin oxidation occurred in mM, cPOM, fPOM-m and fPOM-mM, while mM and cPOM exhibited increased lignin/N ratios under N enrichment. The results indicate that N deposition facilitated preservation of recalcitrant fPOM rather than carbon-rich particles in mM. The N-induced increase in mM proportion in macroaggregates and carbon stability of fPOM in mM contributed to SOC sequestration in the studied fields.

Conclusion

The quantitative and qualitative changes in mM and fPOM within macroaggregates may predict the positive response of SOC sequestration in the 300-year-old forest to long-term atmospheric N deposition in the future. 

文章二维码:

更多信息关注“天然有机质研究情报”。

长按二维码识别关注我们