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Tap water microbiome shifts in secondary water supply for high-rise buildings 高层建筑二次供水中自来水微生物群的变化
IF 12.6 1区 环境科学与生态学 Q1 Environmental Science Pub Date : 2024-03-16 DOI: 10.1016/j.ese.2024.100413
Manjie Li , Zhaowei Liu , Yongcan Chen

In high-rise buildings, secondary water supply systems (SWSSs) are pivotal yet provide a conducive milieu for microbial proliferation due to intermittent flow, low disinfectant residual, and high specific pipe-surface area, raising concerns about tap water quality deterioration. Despite their ubiquity, a comprehensive understanding of bacterial community dynamics within SWSSs remains elusive. Here we show how intrinsic SWSS variables critically shape the tap water microbiome at distal ends. In an office setting, distinct from residential complexes, the diversity in piping materials instigates a noticeable bacterial community shift, exemplified by a transition from α-Proteobacteria to γ-Proteobacteria dominance, alongside an upsurge in bacterial diversity and microbial propagation potential. Extended water retention within SWSSs invariably escalates microbial regrowth propensities and modulates bacterial consortia, yet secondary disinfection emerges as a robust strategy for preserving water quality integrity. Additionally, the regularity of water usage modulates proximal flow dynamics, thereby influencing tap water's microbial landscape. Insights garnered from this investigation lay the groundwork for devising effective interventions aimed at safeguarding microbiological standards at the consumer's endpoint.

在高层建筑中,二次供水系统(SWSS)起着举足轻重的作用,但由于水流时断时续、消毒剂残留量低、管道表面积大等原因,为微生物的繁殖提供了有利环境,从而引发了对自来水水质恶化的担忧。尽管自来水厂无处不在,但人们对自来水厂内细菌群落动态的全面了解仍很渺茫。在这里,我们展示了自来水厂固有变量如何在远端关键地塑造自来水微生物群落。在办公室环境中,与住宅区不同,管道材料的多样性促使细菌群落发生了明显的变化,例如从α-蛋白杆菌占优势转变为γ-蛋白杆菌占优势,同时细菌多样性和微生物繁殖潜力也急剧上升。在自来水厂中延长水的滞留时间必然会加剧微生物的再生倾向并改变细菌群落,但二次消毒是保持水质完整性的有力策略。此外,用水的规律性会调节近端水流动态,从而影响自来水的微生物景观。从这项调查中获得的启示为设计有效的干预措施奠定了基础,这些干预措施旨在保障消费者终端的微生物标准。
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引用次数: 0
Electrical stress and acid orange 7 synergistically clear the blockage of electron flow in the methanogenesis of low-strength wastewater 电应力和酸性橙 7 协同清除低浓度废水产甲烷过程中电子流的阻塞
IF 12.6 1区 环境科学与生态学 Q1 Environmental Science Pub Date : 2024-03-13 DOI: 10.1016/j.ese.2024.100410
Ze-Chong Guo , Min-Hua Cui , Chun-Xue Yang , Hong-Liang Dai , Tong-Yi Yang , Lin-Zhi Zhai , Yong Chen , Wen-Zong Liu , Ai-Jie Wang

Energy recovery from low-strength wastewater through anaerobic methanogenesis is constrained by limited substrate availability. The development of efficient methanogenic communities is critical but challenging. Here we develop a strategy to acclimate methanogenic communities using conductive carrier (CC), electrical stress (ES), and Acid Orange 7 (AO7) in a modified biofilter. The synergistic integration of CC, ES, and AO7 precipitated a remarkable 72-fold surge in methane production rate compared to the baseline. This increase was attributed to an altered methanogenic community function, independent of the continuous presence of AO7 and ES. AO7 acted as an external electron acceptor, accelerating acetogenesis from fermentation intermediates, restructuring the bacterial community, and enriching electroactive bacteria (EAB). Meanwhile, CC and ES orchestrated the assembly of the archaeal community and promoted electrotrophic methanogens, enhancing acetotrophic methanogenesis electron flow via a mechanism distinct from direct electrochemical interactions. The collective application of CC, ES, and AO7 effectively mitigated electron flow impediments in low-strength wastewater methanogenesis, achieving an additional 34% electron recovery from the substrate. This study proposes a new method of amending anaerobic digestion systems with conductive materials to advance wastewater treatment, sustainability, and energy self-sufficiency.

通过厌氧产甲烷从低浓度废水中回收能量受到基质供应有限的限制。发展高效的产甲烷群落至关重要,但也极具挑战性。在此,我们开发了一种策略,在改良生物滤池中使用导电载体(CC)、电应力(ES)和酸性橙 7(AO7)来调节产甲烷群落。与基线相比,CC、ES 和 AO7 的协同作用使甲烷产生率显著增加了 72 倍。这一增长归因于甲烷生成群落功能的改变,与 AO7 和 ES 的持续存在无关。AO7 作为外部电子受体,加速了发酵中间产物的乙酰生成,重组了细菌群落,并丰富了电活性细菌(EAB)。与此同时,CC 和 ES 协调了古菌群落的组装,促进了电营养甲烷菌的生长,通过一种不同于直接电化学相互作用的机制增强了乙酰甲烷生成的电子流。CC、ES和AO7的联合应用有效地缓解了低浓度废水甲烷化过程中的电子流障碍,使底物的电子回收率提高了34%。这项研究提出了一种用导电材料改进厌氧消化系统的新方法,以促进废水处理、可持续发展和能源自给自足。
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引用次数: 0
Spatiotemporal drivers of urban water pollution: Assessment of 102 cities across the Yangtze River Basin 城市水污染的时空驱动因素:对长江流域 102 个城市的评估
IF 12.6 1区 环境科学与生态学 Q1 Environmental Science Pub Date : 2024-03-11 DOI: 10.1016/j.ese.2024.100412
Yi-Lin Zhao , Han-Jun Sun , Xiao-Dan Wang , Jie Ding , Mei-Yun Lu , Ji-Wei Pang , Da-Peng Zhou , Ming Liang , Nan-Qi Ren , Shan-Shan Yang

Effective management of large basins necessitates pinpointing the spatial and temporal drivers of primary index exceedances and urban risk factors, offering crucial insights for basin administrators. Yet, comprehensive examinations of multiple pollutants within the Yangtze River Basin remain scarce. Here we introduce a pollution inventory for urban clusters surrounding the Yangtze River Basin, analyzing water quality data from 102 cities during 2018–2019. We assessed the exceedance rates for six pivotal indicators: dissolved oxygen (DO), ammonia nitrogen (NH3–N), chemical oxygen demand (COD), biochemical oxygen demand (BOD), total phosphorus (TP), and the permanganate index (CODMn) for each city. Employing random forest regression and SHapley Additive exPlanations (SHAP) analyses, we identified the spatiotemporal factors influencing these key indicators. Our results highlight agricultural activities as the primary contributors to the exceedance of all six indicators, thus pinpointing them as the leading pollution source in the basin. Additionally, forest coverage, livestock farming, chemical and pharmaceutical sectors, along with meteorological elements like precipitation and temperature, significantly impacted various indicators' exceedances. Furthermore, we delineate five core urban risk components through principal component analysis, which are (1) anthropogenic and industrial activities, (2) agricultural practices and forest extent, (3) climatic variables, (4) livestock rearing, and (5) principal polluting sectors. The cities were subsequently evaluated and categorized based on these risk components, incorporating policy interventions and administrative performance within each region. The comprehensive analysis advocates for a customized strategy in addressing the discerned risk factors, especially for cities presenting elevated risk levels.

要对大型流域进行有效管理,就必须准确定位首要指标超标的时空驱动因素和城市风险因素,从而为流域管理者提供至关重要的见解。然而,对长江流域内多种污染物的全面研究仍然很少。在此,我们介绍了长江流域周边城市群的污染清单,分析了 2018-2019 年期间 102 个城市的水质数据。我们评估了各城市溶解氧(DO)、氨氮(NH3-N)、化学需氧量(COD)、生化需氧量(BOD)、总磷(TP)和高锰酸盐指数(CODMn)六项关键指标的超标率。通过随机森林回归和 SHapley Additive exPlanations(SHAP)分析,我们确定了影响这些关键指标的时空因素。结果表明,农业活动是导致所有六项指标超标的主要因素,因此农业活动是该流域的主要污染源。此外,森林覆盖率、畜牧业、化工和制药行业以及降水和温度等气象要素也对各项指标的超标产生了重大影响。此外,我们还通过主成分分析划分出五个核心城市风险成分,分别是:(1)人为活动和工业活动;(2)农业生产方式和森林覆盖率;(3)气候变量;(4)畜牧业;(5)主要污染行业。随后,根据这些风险因素对城市进行了评估和分类,并将政策干预措施和行政绩效纳入每个区域。综合分析主张采用定制战略来应对已发现的风险因素,特别是对于风险水平较高的城市。
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引用次数: 0
Microeukaryotic plankton community dynamics under ecological water replenishment: Insights from eDNA metabarcoding 生态补水下的微真核浮游生物群落动力学:eDNA 代谢编码的启示
IF 12.6 1区 环境科学与生态学 Q1 Environmental Science Pub Date : 2024-03-07 DOI: 10.1016/j.ese.2024.100409
Shuping Wang , Songsong Gu , Yaqun Zhang , Ye Deng , Wenhui Qiu , Qianhang Sun , Tianxu Zhang , Pengyuan Wang , Zhenguang Yan

Ecological water replenishment (EWR) is an important strategy for river restoration globally, but timely evaluation of its ecological effects at a large spatiotemporal scale to further adjust the EWR schemes is of great challenge. Here, we examine the impact of EWR on microeukaryotic plankton communities in three distinct river ecosystems through environmental DNA (eDNA) metabarcoding. The three ecosystems include a long-term cut-off river, a short-term connected river after EWR, and long-term connected rivers. We analyzed community stability by investigating species composition, stochastic and deterministic dynamics interplay, and ecological network robustness. We found that EWR markedly reduced the diversity and complexity of microeukaryotic plankton, altered their community dynamics, and lessened the variation within the community. Moreover, EWR disrupted the deterministic patterns of community organization, favoring dispersal constraints, and aligning with trends observed in naturally connected rivers. The shift from an isolated to a temporarily connected river appeared to transition community structuring mechanisms from deterministic to stochastic dominance, whereas, in permanently connected rivers, both forces concurrently influenced community assembly. The ecological network in temporarily connected rivers post-EWR demonstrated significantly greater stability and intricacy compared to other river systems. This shift markedly bolstered the resilience of the ecological network. The eDNA metabarcoding insights offer a novel understanding of ecosystem resilience under EWR interventions, which could be critical in assessing the effects of river restoration projects throughout their life cycle.

生态补水(EWR)是全球河流修复的一项重要战略,但在大时空尺度上及时评估其生态效应以进一步调整生态补水方案是一项巨大的挑战。在这里,我们通过环境 DNA(eDNA)元条码研究了 EWR 对三个不同河流生态系统中微真核浮游生物群落的影响。这三个生态系统包括长期断流的河流、EWR 后短期连通的河流以及长期连通的河流。我们通过研究物种组成、随机和确定性动力学相互作用以及生态网络稳健性来分析群落稳定性。我们发现,EWR 明显降低了微真核细胞浮游生物的多样性和复杂性,改变了它们的群落动力学,减少了群落内部的变异。此外,EWR 破坏了群落组织的确定性模式,有利于分散限制,与在自然连接的河流中观察到的趋势一致。从孤立的河流到暂时连通的河流,群落结构机制似乎从确定性主导转变为随机性主导,而在永久连通的河流中,两种力量同时影响着群落的组合。与其他河流系统相比,EWR 后暂时连通的河流的生态网络显示出更高的稳定性和复杂性。这种转变明显增强了生态网络的恢复能力。eDNA 代谢编码的研究成果为人们提供了一种对 EWR 干预下生态系统恢复能力的新认识,这对于评估河流修复项目在其整个生命周期内的效果至关重要。
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引用次数: 0
Modifying temperature-related cardiovascular mortality through green-blue space exposure 通过绿蓝空间暴露改变与温度相关的心血管死亡率
IF 12.6 1区 环境科学与生态学 Q1 Environmental Science Pub Date : 2024-03-07 DOI: 10.1016/j.ese.2024.100408
Kejia Hu , Shiyi Wang , Fangrong Fei , Jinglu Song , Feng Chen , Qi Zhao , Yujie Shen , Jingqiao Fu , Yunquan Zhang , Jian Cheng , Jieming Zhong , Xuchao Yang , Jiayu Wu

Green-blue spaces (GBS) are pivotal in mitigating thermal discomfort. However, their management lacks guidelines rooted in epidemiological evidence for specific planning and design. Here we show how various GBS types modify the link between non-optimal temperatures and cardiovascular mortality across different thermal extremes. We merged fine-scale population density and GBS data to create novel GBS exposure index. A case time series approach was employed to analyse temperature-cardiovascular mortality association and the effect modifications of type-specific GBSs across 1085 subdistricts in south-eastern China. Our findings indicate that both green and blue spaces may significantly reduce high-temperature-related cardiovascular mortality risks (e.g., for low (5%) vs. high (95%) level of overall green spaces at 99th vs. minimum mortality temperature (MMT), Ratio of relative risk (RRR) = 1.14 (95% CI: 1.07, 1.21); for overall blue spaces, RRR = 1.20 (95% CI: 1.12, 1.29)), while specific blue space types offer protection against cold temperatures (e.g., for the rivers at 1st vs MMT, RRR = 1.17 (95% CI: 1.07, 1.28)). Notably, forests, parks, nature reserves, street greenery, and lakes are linked with lower heat-related cardiovascular mortality, whereas rivers and coasts mitigate cold-related cardiovascular mortality. Blue spaces provide greater benefits than green spaces. The severity of temperature extremes further amplifies GBS's protective effects. This study enhances our understanding of how type-specific GBS influences health risks associated with non-optimal temperatures, offering valuable insights for integrating GBS into climate adaptation strategies for maximal health benefits.

绿蓝空间(GBS)在缓解热不适方面发挥着关键作用。然而,在具体的规划和设计中,它们的管理缺乏基于流行病学证据的指导方针。在这里,我们展示了各种类型的 GBS 如何在不同的极端热量条件下改变非最佳温度与心血管死亡率之间的联系。我们合并了精细尺度的人口密度和 GBS 数据,创建了新的 GBS 暴露指数。我们采用病例时间序列法分析了中国东南部 1085 个分区的气温与心血管疾病死亡率之间的关系,以及特定类型的 GBS 对气温的影响。我们的研究结果表明,绿地和蓝地都能显著降低与高温相关的心血管死亡风险(例如,低温(5%)与高温(5%)相比,绿地和蓝地都能显著降低心血管死亡风险)、99度与最低死亡温度(MMT)的低(5%)与高(95%)水平的整体绿地,相对风险比(RRR)=1.14(95% CI:1.07,1.21);整体蓝地,RRR=1.20(95% CI:1.12,1.29)),而特定类型的蓝地则可抵御低温(例如,1度与最低死亡温度(MMT)的河流,RRR=1.17(95% CI:1.07,1.28))。值得注意的是,森林、公园、自然保护区、街道绿化和湖泊与降低与高温相关的心血管死亡率有关,而河流和海岸则可降低与低温相关的心血管死亡率。蓝色空间比绿色空间带来的益处更大。极端气温的严重程度进一步扩大了全球生物圈保护效应。这项研究加深了我们对特定类型的全球生物圈保护如何影响与非最佳温度相关的健康风险的理解,为将全球生物圈保护纳入气候适应战略以获得最大健康效益提供了宝贵的见解。
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引用次数: 0
Harnessing photosynthetic microorganisms for enhanced bioremediation of microplastics: A comprehensive review 利用光合微生物加强微塑料的生物修复:综述
IF 12.6 1区 环境科学与生态学 Q1 Environmental Science Pub Date : 2024-03-05 DOI: 10.1016/j.ese.2024.100407
Giovanni Davide Barone , Andrés Rodríguez-Seijo , Mattia Parati , Brian Johnston , Elif Erdem , Tomislav Cernava , Zhi Zhu , Xufeng Liu , Ilka M. Axmann , Peter Lindblad , Iza Radecka

Mismanaged plastics, upon entering the environment, undergo degradation through physicochemical and/or biological processes. This process often results in the formation of microplastics (MPs), the most prevalent form of plastic debris (<1 mm). MPs pose severe threats to aquatic and terrestrial ecosystems, necessitating innovative strategies for effective remediation. Some photosynthetic microorganisms can degrade MPs but there lacks a comprehensive review. Here we examine the specific role of photoautotrophic microorganisms in water and soil environments for the biodegradation of plastics, focussing on their unique ability to grow persistently on diverse polymers under sunlight. Notably, these cells utilise light and CO2 to produce valuable compounds such as carbohydrates, lipids, and proteins, showcasing their multifaceted environmental benefits. We address key scientific questions surrounding the utilisation of photosynthetic microorganisms for MPs and nanoplastics (NPs) bioremediation, discussing potential engineering strategies for enhanced efficacy. Our review highlights the significance of alternative biomaterials and the exploration of strains expressing enzymes, such as polyethylene terephthalate (PET) hydrolases, in conjunction with microalgal and/or cyanobacterial metabolisms. Furthermore, we delve into the promising potential of photo-biocatalytic approaches, emphasising the coupling of plastic debris degradation with sunlight exposure. The integration of microalgal-bacterial consortia is explored for biotechnological applications against MPs and NPs pollution, showcasing the synergistic effects in wastewater treatment through the absorption of nitrogen, heavy metals, phosphorous, and carbon. In conclusion, this review provides a comprehensive overview of the current state of research on the use of photoautotrophic cells for plastic bioremediation. It underscores the need for continued investigation into the engineering of these microorganisms and the development of innovative approaches to tackle the global issue of plastic pollution in aquatic and terrestrial ecosystems.

管理不当的塑料进入环境后,会通过物理化学和/或生物过程发生降解。这一过程通常会形成微塑料(MPs),即最常见的塑料碎片(1 毫米)。微塑料对水生和陆地生态系统构成严重威胁,因此必须采取创新策略进行有效补救。一些光合微生物可以降解 MPs,但缺乏全面的综述。在这里,我们研究了光自养微生物在水和土壤环境中对塑料生物降解的特殊作用,重点关注它们在阳光下在不同聚合物上持续生长的独特能力。值得注意的是,这些细胞利用光和二氧化碳生产碳水化合物、脂类和蛋白质等有价值的化合物,展示了其多方面的环境效益。我们探讨了利用光合微生物进行 MPs 和纳米塑料 (NPs) 生物修复的关键科学问题,并讨论了提高功效的潜在工程策略。我们的综述强调了替代生物材料的重要性,以及对表达酶(如聚对苯二甲酸乙二醇酯(PET)水解酶)的菌株与微藻和/或蓝藻代谢物结合的探索。此外,我们还深入研究了光生物催化方法的巨大潜力,强调了塑料碎片降解与阳光照射的结合。我们还探讨了微藻-细菌联合体在生物技术方面的应用,以应对 MPs 和 NPs 污染,通过吸收氮、重金属、磷和碳,展示了在废水处理方面的协同效应。总之,本综述全面概述了利用光自养细胞进行塑料生物修复的研究现状。它强调了继续研究这些微生物工程学和开发创新方法以解决水生和陆地生态系统中塑料污染这一全球性问题的必要性。
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引用次数: 0
Glycine betaine modulates extracellular polymeric substances to enhance microbial salinity tolerance 甘氨酸甜菜碱调节细胞外聚合物质,提高微生物的耐盐性
IF 12.6 1区 环境科学与生态学 Q1 Environmental Science Pub Date : 2024-03-01 DOI: 10.1016/j.ese.2024.100406
Yan Xia , Xinbai Jiang , Shuaishuai Guo , Yuxuan Wang , Yang Mu , Jinyou Shen

High salinity inhibits microbial activity in the bioremediation of saline wastewater. To alleviate osmotic stress, glycine betaine (GB), an osmoprotectant, is added to enhance the secretion of extracellular polymeric substances (EPS). These EPS are pivotal in withstanding environmental stressors, yet the intricate interplay between GB supplementation and microbial responses through EPS modifications—encompassing composition, molecular architecture, and electrochemical features—remains elusive in hypersaline conditions. Here we show microbial strategies for salinity endurance by investigating the impact of GB on the dynamic alterations of EPS properties. Our findings reveal that GB supplementation at 3.5% salinity elevates the total EPS (T-EPS) content from 12.50 ± 0.05 to 24.58 ± 0.96 mg per g dry cell weight. The observed shift in zeta potential from −28.95 to −6.25 mV at 0% and 3.5% salinity, respectively, with GB treatment, indicates a reduction in electrostatic repulsion and compaction. Notably, the EPS protein secondary structure transition from β-sheet to α-helix, with GB addition, signifies a more compact protein configuration, less susceptible to salinity fluctuations. Electrochemical analyses, including cyclic voltammetry (CV) and differential pulse voltammetry (DPV), reveal GB's role in promoting the release of exogenous electron shuttles, such as flavins and c-type cytochromes (c-Cyts). The enhancement in DPV peak areas (QDPV) with GB addition implies an increase in available extracellular electron transfer sites. This investigation advances our comprehension of microbial adaptation mechanisms to salinity through EPS modifications facilitated by GB in saline habitats.

高盐度抑制了含盐废水生物修复中的微生物活性。为了减轻渗透压,需要添加渗透保护剂甘氨酸甜菜碱(GB),以增强细胞外高分子物质(EPS)的分泌。这些 EPS 对抵御环境压力至关重要,但在高盐度条件下,GB 的补充与微生物通过 EPS 的改变(包括成分、分子结构和电化学特征)做出的反应之间错综复杂的相互作用仍然难以捉摸。在这里,我们通过研究 GB 对 EPS 特性动态变化的影响,展示了微生物耐盐策略。我们的研究结果表明,在 3.5% 的盐度条件下补充 GB 可使每克干细胞重量的总 EPS(T-EPS)含量从 12.50 ± 0.05 毫克增至 24.58 ± 0.96 毫克。在 GB 处理下,观察到 zeta 电位在 0% 和 3.5% 盐度下分别从 -28.95 mV 变为 -6.25 mV,这表明静电排斥和压实作用减弱。值得注意的是,添加 GB 后,EPS 蛋白二级结构从 β 片状转变为 α 螺旋状,这表明蛋白质结构更加紧凑,不易受盐度波动的影响。电化学分析,包括循环伏安法(CV)和差分脉冲伏安法(DPV),揭示了 GB 在促进黄素和 c 型细胞色素(c-Cyts)等外源电子穿梭器释放方面的作用。加入 GB 后,DPV 峰面积(QDPV)的增加意味着可用的细胞外电子传递位点的增加。这项研究推动了我们对微生物适应盐度机制的理解,即在盐碱环境中通过 GB 促进 EPS 的改变。
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引用次数: 0
Water quality prediction based on sparse dataset using enhanced machine learning 利用增强型机器学习进行基于稀疏数据集的水质预测
IF 12.6 1区 环境科学与生态学 Q1 Environmental Science Pub Date : 2024-03-01 DOI: 10.1016/j.ese.2024.100402
Sheng Huang , Jun Xia , Yueling Wang , Jiarui Lei , Gangsheng Wang

Water quality in surface bodies remains a pressing issue worldwide. While some regions have rich water quality data, less attention is given to areas that lack sufficient data. Therefore, it is crucial to explore novel ways of managing source-oriented surface water pollution in scenarios with infrequent data collection such as weekly or monthly. Here we showed sparse-dataset-based prediction of water pollution using machine learning. We investigated the efficacy of a traditional Recurrent Neural Network alongside three Long Short-Term Memory (LSTM) models, integrated with the Load Estimator (LOADEST). The research was conducted at a river-lake confluence, an area with intricate hydrological patterns. We found that the Self-Attentive LSTM (SA-LSTM) model outperformed the other three machine learning models in predicting water quality, achieving Nash-Sutcliffe Efficiency (NSE) scores of 0.71 for CODMn and 0.57 for NH3N when utilizing LOADEST-augmented water quality data (referred to as the SA-LSTM-LOADEST model). The SA-LSTM-LOADEST model improved upon the standalone SA-LSTM model by reducing the Root Mean Square Error (RMSE) by 24.6% for CODMn and 21.3% for NH3N. Furthermore, the model maintained its predictive accuracy when data collection intervals were extended from weekly to monthly. Additionally, the SA-LSTM-LOADEST model demonstrated the capability to forecast pollution loads up to ten days in advance. This study shows promise for improving water quality modeling in regions with limited monitoring capabilities.

地表水体的水质仍然是全球面临的一个紧迫问题。虽然一些地区拥有丰富的水质数据,但对缺乏足够数据的地区关注较少。因此,在数据收集不频繁(如每周或每月一次)的情况下,探索以源头为导向的地表水污染管理新方法至关重要。在此,我们利用机器学习展示了基于稀疏数据集的水污染预测。我们研究了传统循环神经网络与三个长短期记忆(LSTM)模型的功效,并将其与负荷估算器(LOADEST)进行了整合。研究是在河流与湖泊交汇处进行的,该地区的水文格局错综复杂。我们发现,自注意 LSTM(SA-LSTM)模型在预测水质方面的表现优于其他三种机器学习模型,在利用 LOADEST 增强的水质数据(简称为 SA-LSTM-LOADEST 模型)时,CODMn 的纳什-苏特克利夫效率(NSE)得分达到 0.71,NH3N 的纳什-苏特克利夫效率(NSE)得分达到 0.57。与独立的 SA-LSTM 模型相比,SA-LSTM-LOADEST 模型将 CODMn 和 NH3N 的均方根误差(RMSE)分别降低了 24.6% 和 21.3%。此外,当数据收集间隔从每周延长到每月时,该模型仍能保持其预测准确性。此外,SA-LSTM-LOADEST 模型还展示了提前十天预测污染负荷的能力。这项研究为改善监测能力有限地区的水质建模工作带来了希望。
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引用次数: 0
Divergent driving mechanisms of community temporal stability in China's drylands 中国旱地群落时间稳定性的不同驱动机制
IF 12.6 1区 环境科学与生态学 Q1 Environmental Science Pub Date : 2024-03-01 DOI: 10.1016/j.ese.2024.100404
Kai Wang , Cong Wang , Bojie Fu , Jianbei Huang , Fangli Wei , Xuejing Leng , Xiaoming Feng , Zongshan Li , Wei Jiang

Climate change and anthropogenic activities are reshaping dryland ecosystems globally at an unprecedented pace, jeopardizing their stability. The stability of these ecosystems is crucial for maintaining ecological balance and supporting local communities. Yet, the mechanisms governing their stability are poorly understood, largely due to the scarcity of comprehensive field data. Here we show the patterns of community temporal stability and its determinants across an aridity spectrum by integrating a transect survey across China's drylands with remote sensing. Our results revealed a U-shaped relationship between community temporal stability and aridity, with a pivotal shift occurring around an aridity level of 0.88. In less arid areas (aridity level below 0.88), enhanced precipitation and biodiversity were associated with increased community productivity and stability. Conversely, in more arid zones (aridity level above 0.88), elevated soil organic carbon and biodiversity were linked to greater fluctuations in community productivity and reduced stability. Our study identifies a critical aridity threshold that precipitates significant changes in community stability in China's drylands, underscoring the importance of distinct mechanisms driving ecosystem stability in varying aridity contexts. These insights are pivotal for developing informed ecosystem management and policy strategies tailored to the unique challenges of dryland conservation.

气候变化和人为活动正以前所未有的速度重塑全球旱地生态系统,危及其稳定性。这些生态系统的稳定性对于维持生态平衡和支持当地社区至关重要。然而,由于缺乏全面的实地数据,人们对这些生态系统的稳定性机制知之甚少。在此,我们将中国旱地的横断面调查与遥感技术结合起来,展示了整个干旱谱系中群落时间稳定性的模式及其决定因素。我们的研究结果表明,群落时间稳定性与干旱度之间呈 "U "型关系,在干旱度为 0.88 时,群落时间稳定性会发生关键性变化。在干旱程度较低的地区(干旱程度低于 0.88),降水量和生物多样性的增加与群落生产力和稳定性的提高有关。相反,在较干旱地区(干旱度高于 0.88),土壤有机碳和生物多样性的增加与群落生产力的更大波动和稳定性的降低有关。我们的研究确定了中国干旱地区群落稳定性发生显著变化的临界干旱阈值,强调了在不同干旱背景下驱动生态系统稳定性的不同机制的重要性。这些见解对于针对旱地保护的独特挑战制定明智的生态系统管理和政策战略至关重要。
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引用次数: 0
Understanding the role of transition metal single-atom electronic structure in oxysulfur radical-mediated oxidative degradation 了解过渡金属单原子电子结构在氧化硫自由基介导的氧化降解中的作用
IF 12.6 1区 环境科学与生态学 Q1 Environmental Science Pub Date : 2024-02-28 DOI: 10.1016/j.ese.2024.100405
Guanshu Zhao , Jing Ding , Jiayi Ren , Qingliang Zhao , Chengliang Mao , Kun Wang , Jessica Ye , Xueqi Chen , Xianjie Wang , Mingce Long

The ubiquity of refractory organic matter in aquatic environments necessitates innovative removal strategies. Sulfate radical-based advanced oxidation has emerged as an attractive solution, offering high selectivity, enduring efficacy, and anti-interference ability. Among many technologies, sulfite activation, leveraging its cost-effectiveness and lower toxicity compared to conventional persulfates, stands out. Yet, the activation process often relies on transition metals, suffering from low atom utilization. Here we introduce a series of single-atom catalysts (SACs) employing transition metals on g-C3N4 substrates, effectively activating sulfite for acetaminophen degradation. We highlight the superior performance of Fe/CN, which demonstrates a degradation rate constant significantly surpassing those of Ni/CN and Cu/CN. Our investigation into the electronic and spin polarization characteristics of these catalysts reveals their critical role in catalytic efficiency, with oxysulfur radical-mediated reactions predominating. Notably, under visible light, the catalytic activity is enhanced, attributed to an increased generation of oxysulfur radicals and a strengthened electron donation-back donation dynamic. The proximity of Fe/CN's d-band center to the Fermi level, alongside its high spin polarization, is shown to improve sulfite adsorption and reduce the HOMO-LUMO gap, thereby accelerating photo-assisted sulfite activation. This work advances the understanding of SACs in environmental applications and lays the groundwork for future water treatment technologies.

水生环境中难于去除的有机物无处不在,因此需要创新的去除策略。基于硫酸根的高级氧化技术具有选择性高、功效持久、抗干扰能力强等特点,已成为一种极具吸引力的解决方案。在众多技术中,亚硫酸盐活化技术因其成本效益高、毒性低于传统过硫酸盐而脱颖而出。然而,活化过程通常依赖于过渡金属,原子利用率较低。在此,我们介绍了一系列在 g-C3N4 底物上使用过渡金属的单原子催化剂 (SAC),它们能有效地活化亚硫酸盐,用于对乙酰氨基酚的降解。我们强调了 Fe/CN 的卓越性能,其降解速率常数大大超过了 Ni/CN 和 Cu/CN。我们对这些催化剂的电子和自旋极化特性进行了研究,发现它们在催化效率方面起着关键作用,其中以氧化硫自由基介导的反应为主。值得注意的是,在可见光下,催化活性得到了增强,这归因于氧化硫自由基生成的增加和电子捐赠-捐赠动态的加强。研究表明,Fe/CN 的 d 带中心接近费米级,同时具有高自旋极化,这改善了亚硫酸盐的吸附性并减小了 HOMO-LUMO 间隙,从而加速了光助亚硫酸盐活化。这项研究加深了人们对环境应用中的 SAC 的了解,并为未来的水处理技术奠定了基础。
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引用次数: 0
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Environmental Science and Ecotechnology
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