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Visible-light-driven photocatalytic inactivation of bacteriophage f2 by Cu-TiO_2 nanofibers in the presence of humic acid

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Journal of environmental Sciences 2019年第3期31卷 383-391页

作者： Rong Cheng Mi Kang Zhi-peng Shen Lei Shi Xiang Zheng school of environment & natural resources Renmin University of China

Pathogenic viruses in drinking water are great threats to public health. Visible-lightdriven photocatalysis is a promising technology for virus inactivation. However, the existing photocatalytic antiviral research studies have mostly been carried out in single-component systems, neglecting the effect of natural organic matter, which exists widely in actual water bodies. In this paper, electrospun Cu-TiO2 nanofibers were prepared as photocatalysts, and their photocatalytic antiviral performance in the presence of humic acid(HA) was comprehensively studied for the first time. The properties of the reaction mixture were measured during the reaction. In addition, the safety, reliability and stability of photocatalytic disinfection in the mixed system were evaluated. The results showed that the virus removal efficiency decreased with the increase of the HA concentration. The type of reaction solution, such as PBS buffer solution or water, did not affect the removal efficiency noticeably. Under acidic conditions, the electrostatic forces between photocatalysts and viruses were strengthened, leading to higher virus removal efficiency. As the reaction time went on, the pH value in the solution increased first and then tended to be stable, the conductivity remained stable, and the dissolved oxygen increased first and then decreased. The safety test showed that the concentration of Cu ions released into the solution was lower than specified by the international standards. No photoreactivation was observed, and the addition of HA significantly reduced the reutilization efficiency of the photocatalysts.

关键词： Photocatalysis Visible light Bacteriophage f2 Humic acid

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Analysis of key microbial community during the start-up of anaerobic ammonium oxidation process with paddy soil as inoculated sludge

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Journal of environmental Sciences 2018年第2期30卷 317-327页

作者： Xianglong Xu Guohua Liu Yuanyuan Wang Yuankai Zhang Hao Wan Lu Qi Hongchen Wang school of environment & natural resources Renmin University of China

A sequencing batch reactor（SBR）-anaerobic ammonium oxidation（anammox） system was started up with the paddy soil as inoculated sludge. The key microbial community structure in the system along with the enrichment time was investigated by using molecular biology methods（e.g., high-throughput 16 S r RNA gene sequencing and quantitative PCR）. Meanwhile,the influent and effluent water quality was continuously monitored during the whole start-up stage. The results showed that the microbial diversity decreased as the operation time initially and increased afterwards, and the microbial niches in the system were redistributed. The anammox bacterial community structure in the SBR-anammox system shifted during the enrichment, the most dominant anammox bacteria were Candidatus Jettenia. The maximum biomass of anammox bacteria achieved 1.68 × 10~9 copies/g dry sludge during the enrichment period, and the highest removal rate of TN achieved around 75%.

关键词： Anammox Paddy soil Community structure High-throughput sequencing qPCR

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An Analysis of Chinese Cities' Pathways towards Carbon Peaking under the Carbon Neutrality Goal

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Chinese Journal of Urban and environmental Studies 2022年第3期10卷 32-45页

作者： WANG Ke XING Baiying JIANG Yuhe school of environment & natural resources Renmin University of China

Now, China has made it clear that it will strive to have CO2emissions peak before 2030 and achieve carbon neutrality before 2060(the “dual carbon” goals), based on the logic that carbon peaking is a prerequisite for carbon neutrality. The year 2021 is the first year of China’s 14 th FiveYear Plan period. As the main battlefields to achieve the “dual carbon” goals, cities are also required to build on their pathways towards such goals under new conditions. Based on the progress China has made with pilot cities for low-carbon development and the discussion on 60 cities by category, this paper identifies the commonalities and differences between Chinese cities’ pathways towards carbon peaking, and concludes that Chinese cities need to peak their carbon emissions in an organized and step-wise way on the basis of classification and according to their own development level and emission characteristics. In light of the above conclusion, this paper provides feasible suggestions for Chinese cities’ carbon peaking.

关键词： Carbon peaking carbon neutrality low-carbon cities

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Changing institutions for environmental policy and politics in New Era China

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Chinese Journal of Population,resources and environment 2018年第3期16卷 242-251页

作者： Lei Zhang Xiaoran Li Department of environment and resources Management School of Environment and Natural Resources Renmin University of China

The evolution of Chinese environmental policy and politics can be better understood in the broader context of institutional changes that have taken place since the late 1970s. In this study,an analytical framework was established to analyze how overall institutional changes were reflected in the roles of relationships between governmental and non-governmental actors engaged in environmental governance. Institutional changes were observed at three levels:informal institutions(cultural traditions, and political ideology); formal institutions(the polity,political system, property rights, and judiciary); and governing mechanisms(structures, regulatory approaches, and incentives). This analysis of interactions between institutional changes and the changing environmental process explained not only the drives and constraints behind China's environmental policy evolution so far but also shed light on future challenges and opportunities.

关键词： Institutional changes environmental politics new environmentalism New Era China

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Heritage tourism evolution in Guangfu Ancient City,Hebei Province,China:an analysis with the improved creative destruction model

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Built Heritage 2022年第3期6卷 28-42页

作者： Menghan Wang Xiaoran Bai Mingming Su school of environment&natural resources Renmin University of ChinaBejing 100872China

Ancient cities and towns are popular tourism destinations worldwide.In this paper,Guangfu Ancient City in Yongnian County,Hebei Province,China,is taken as the case study and the modifed creative destruction model is applied as the analytical framework to evaluate the multiactor dynamics of heritage tourism development.A mixed method approach is adopted,including a local resident survey,in-depth interviews with staf of the Guangfu Ancient City tourism site and government ofcials responsible for the heritage conservation and tourism development of the site,and a review of online tourist reviews,relevant government documents and reports.Based on the modifed creative destruction model,local residents’attitudes towards tourism development,changes in tourist numbers,the level of business and government investments,and the motivations of diferent stakeholders in tourism development are assessed by synthesising on-site research,historical data and other materials.Then,the tourism development stages for Guangfu Ancient City are identifed as the precommodifcation stage before 2006,the early commodifcation stage from 2006 to 2011 and the advanced commodifcation stage from 2012 to 2017.The fndings indicate that with rapid increases in investments from both corporate and government sources and in the number of tourists,the attitude of local residents towards tourism development remained positive.The results show that instead of entering the initial destruction stage,Guangfu Ancient City is in the transition stage from advanced commodifcation to creative enhancement given the government’s dominant role in tourism development,the heritage conservation motives of tourism entrepreneurs,the benefts to residents from tourism development ensured by government policies,and the shift in tourist type to postmodern tourists with double demands.The applicability of the modifed creative destruction model is further discussed,and policy and management recommendations are generated to support the sustainable development of Guangfu Ancient C

关键词： Creative destruction Creative enhancement Heritage tourism Tourism commercialisation Stakeholder Guangfu Ancient City

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Effect of forest fire on soil microbial biomass and enzymatic activity in oak and pine forests of Uttarakhand Himalaya, India

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Ecological Processes 2021年第1期10卷 394-407页

作者： Devanshi Singh Priyanka Sharma Ujjwal Kumar Achlesh Daverey Kusum Arunachalam school of environment and natural resources Doon UniversityDehradunUttarakhand 248012India

Background:Forest fire incidences in the Himalayan region of Uttarakhand,India are very common in summers.Pine and oak are the principal and dominant species of Himalayan subtropical forest and Himalayan temperate forest,respectively.Forest vegetation influences the physicochemical and biological properties of soil and forest fire in pine and oak forests may have a different effect on the physicochemical and biological properties of soil.Therefore,the present study was carried out to assess the impact of forest fire on soil microbial properties,enzymatic activity,and their relationship with soil physicochemical properties in the advent of forest fire in the pine and oak forests of the Garhwal region of Uttarakhand Himalaya,India.Results:The soil microbial biomass carbon and nitrogen,soil basal respiration,and acid phosphatase activity decreased,whereas dehydrogenase activity increased at burnt sites of both forest types.The overall change in soil microbial biomass carbon was 63 and 40%at the burnt oak forest and burnt pine forest,respectively.Dehydrogenase activity and acid phosphatase activity showed a strong positive correlation with soil organic matter(r=0.8)and microbial indices,respectively.The ratio of soil microbial biomass carbon/nitrogen was reduced at burnt sites of both forest types.Factor analysis results showed that fire had a significant impact on soil characteristics.The soil basal respiration was linked with macro-and micronutrients at burnt sites,whereas at control sites,it was linked with physicochemical properties of soil along with nutrients.Conclusion:Forest fire had a significant impact on soil properties of both forest types.The impact of forest fire on soil microbial biomass carbon was stronger in the oak forest than in the pine forest.Forest type influenced soil enzymatic activity at burnt sites.The bacterial community was dominated over fungi in burnt sites of both forests.Soil microbial indices can be used as a selective measure to assess the impact of fire.Furthermore,forest type plays

关键词： Microbial indices Soil enzymes Microbial biomass Forest fire Pine forest Oak forest

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Behavioral differences within and among populations of an African cichlid found in divergent and extreme environments

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Current Zoology 2019年第1期65卷 33-42页

作者： Richard C. Oldham Lauren M. Pintor Suzanne M. Gray school of environment and natural resources The Ohio State University Columbus OH 43210 USA

Animals are increasingly faced with human?induced stressors that vary in space and time, thus we can expect populati on-level diverge nee in behaviors that help animals to cope with en vironme ntal change. However, empirical evidenee of behavioral trait divergence across environmental extremes is lacking. We tested for variation in behavioral traits among 2 populations of an African cichlid fish (Pseudocrenilabrus multicolor victoriae Seegers, 1990) that experience extremes of dissolved oxygen (DO) and turbidity and are known to vary in a number of physiological and life history traits associated with these stressors. Using a comm on garden reari ng experime nt, F1 progeny from wild-caught parents originating from a swamp (low DO, clear) and a river (high DO, turbid) were reared in high DO, clear water. Predator simulation assays were conducted to test for (1) variation in boldness, general activity, and foraging activity between populations,(2) differences in correlations betwee n behaviors with in and across populati ons, and (3) repeatability of behaviors. There was strong evide nee for diverge nee betwee n populati ons, with swamp fish being more bold (i.e.z leaving refuge sooner after a simulated predator attack) and active (i.e., spent more time out of refuge) than river fish. Across populations there were positive correlations between foraging activity and both boldness and general activity;however, within populations, there was only a strong positive relationship between foraging activity and boldness in the river population. Here, we have demonstrated that populations that originate from drastically different environments can produce proge ny that exhibit measurable differences in behaviors and their correlated relati on ships eve n whe n reared un der comm on conditions.

关键词： behavioral correlation behavioral syndrome boldness hypoxia pace of life turbidity

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Remediation of di(2-ethylhexyl)phthalate(DEHP)contaminated black soil by freeze-thaw aging biochar

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Journal of environmental Sciences 2024年第1期135卷 681-692页

作者： Lei Wang Zeyu Dou Chaoran Ma Xiaochen Jia Hongye Wang Wenjing Bao Lei Wang Jianhua Qu Ying Zhang school of resources and environment Northeast Agricultural UniversityHarbin 150030China

Di(2-ethylhexyl)phthalate(DEHP),a complex structure with high toxicity,is a common organic pollutant.This study investigated the effects of fresh biochar(FBC),and freeze-thaw cycled aged biochar(FTC-BC)on DEHP-contaminated soils using a pot experiment.The specific surface area of FBC increased from 145.20 to 303.50 m~2/g,and oxygen-containing functional groups increased from 1.26 to 1.48 mol/g after freeze-thaw cycles,greatly enhancing the adsorption of DEHP by biochar in the soil.The comprehensive radar chart evaluation showed that FBC and FTC-BC reduced DEHP growth stress and improved the soil properties.Compared with FBC,FTC-BC performed better in protecting the normal growth of pakchoi and improving soil properties.In addition,the application of biochar increased the diversity and abundance of bacteria in the DEHP-contaminated soil and changed the composition of the soil bacterial community.The partial least squares path model(PLS-PM)showed that adding biochar as a soil remediation agent significantly positively impacted soil nutrients and indirectly reduced the DEHP levels in soil and plants by increasing soil microbial diversity.Compared with FBC,FTC-BC creates a more satisfactory living environment for microorganisms and has a better effect on the degradation of DEHP in the soil.This study provides a theoretical basis for future biochar remediation of DEHP-contaminated soils in cold high-latitude regions.

关键词： DEHP Freeze-thaw cycles Biochar Soil restoration

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Differential evolution of territorial space and effects on ecological environment quality in China's border regions

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Journal of Geographical Sciences 2024年第6期34卷 1109-1127页

作者： GU Guanhai WU Bin LU Shengquan ZHANG Wenzhu TIAN Yichao LU Rucheng FENG Xiaoling LIAO Wenhui school of natural resources and Surveying Nanning Normal University school of resources and environment Beibu Gulf University

The use of territories in border areas is sensitive, unique, and ecologically fragile. A scientific understanding of the transformation of the national territorial space and its ecological and environmental responses is crucial for optimizing spatial patterns and promoting sustainable utilization. This study focused on 45 cities in the land border areas of China and employed techniques such as the land transfer matrix, Theil index, and ecological environment index to explore the spatiotemporal evolution process and eco-environmental effects of territorial space from three dimensions: spatial pattern, structural transformation, and ecological response. The results show that:(1) During the study period, there was an increasing trend in living and production space, along with a decrease in ecological space, and a significant pattern of "one belt, three districts, and multipoints" emerged.(2) In the urbanization process, population growth and industrial agglomeration have led to the transformation and conflict of territorial spaces, with the conversion of ecological spaces into production spaces being the primary form of land-use transformation. Rapid development has resulted in spatial differentiation of the territorial space between regions.(3) During this period, the ecological quality in China’s border areas deteriorated, yet the distribution pattern of ecological space remained stable, exhibiting a “high value in the southeast, low value in the northwest” pattern.(4) Improvements and degradation of the ecology coexist in different border areas; transforming agricultural production space into green and potential ecological spaces has positively contributed to enhancing ecological quality. In contrast, converting green ecological space into potential ecological space, agricultural production space, and aquatic ecological space has become a key factor in ecological degradation. Therefore, the border areas of China should utilize national preferential policies and strategies, recognize the vast and varied expanse of

关键词： production-living-ecological space evolution of the pattern multidimensional characteristics ecological environment quality China’s land border belt

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Green manufacturing for achieving carbon neutrality goal requires innovative technologies:A bibliometric analysis from 1991 to 2022

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Journal of environmental Sciences 2024年第6期140卷 255-269页

作者： Sheng Zhang Xintian Wang Jiayu Xu Qinqin Chen Meng Peng Jiming Hao school of environment Tsinghua UniversityBeijing 100084China school of environment&natural resources Renmin University of ChinaBeijing 100872China State environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China

Recent years have seen a significant increase in interest in green manufacturing as a key driver of global carbon-neutral efforts and sustainable development.To find the research hotspots of green manufacturing and reveal future research trends,this study reviewed and analyzed research articles from the Web of Science database on green manufacturing from1991 to 2022 using a bibliometric method.The findings indicate a significant rise in the number of articles related to green manufacturing since the 2010s.Moreover,there has been an increase in the involvement of scholars from developing countries such as China and India in this field.Based on the literature review and bibliometric cluster analysis on green manufacturing,we believed that future research may continue following the lines of intelligent technology integration,adoption of frontier engineering techniques,and industry development in line with carbon reduction targets.A framework for future green manufacturing development is proposed,with a focus on Chinese policies.The framework could provide policy implications for developing countries looking to pursue opportunities for development in green manufacturing.

关键词： Green manufacturing Carbon neutrality Sustainable development Innovative technologies China

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