|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Contribution of periphytic biofilm of paddy soils to carbon dioxide fixation and methane emissions显示文摘Rice paddies are major contributors to anthropogenic greenhouse gas emissions via methane(CH_(4))flux.The accurate quantification of CH_(4)emissions from rice paddies remains problematic,in part due to uncertainties and omissions in the contribution of microbial aggregates on the soil surface to carbon fluxes.Herein,we comprehensively evaluated the contribution of one form of microbial aggregates,periphytic biofilm(PB),to carbon dioxide(CO_(2))and CH_(4)emissions from paddies distributed across three climatic zones,and quantified the pathways that drive net CH_(4)production as well as CO_(2)fixation.We found that PB accounted for 7.1%-38.5%of CH_(4)emissions and 7.2%-12.7%of CO_(2)fixation in the rice paddies.During their growth phase,PB fixed CO_(2)and increased the redox potential,which promoted aerobic CH_(4)oxidation.During the decay phase,PB degradation reduced redox potential and increased soil organic carbon availability,which promoted methanogenic microbial community growth and metabolism and increased CH_(4)emissions.Overall,PB acted as a biotic converter of atmospheric CO_(2)to CH_(4),and aggravated carbon emissions by up to 2,318 kg CO_(2)equiv ha^(-1)season^(-1).Our results provide proof-of-concept evidence for the discrimination of the contributions of surface microbial aggregates(i.e.,PB)from soil microbes,and a profound foundation for the estimation and simulation of carbon fluxes in a potential novel approach to the mitigation of CH_(4)emissions by manipulating PB growth. | Sichu Wang Pengfei Sun Guangbin Zhang Neil Gray Jan Dolfing Sofia Esquivel-Elizondo Josep Peñuelas Yonghong Wu | 2022 | The Innovation2022，3，1： | 2 |
| 2 | Kinetics of Ozonation of Typical Sulfonamides in Water显示文摘Objective To investigate the kinetic rate constants ozone and hydroxyl radicals towards two groups of antimicrobials-sulfadiazine (SD) and sulfamethoxazole (SMX).Methods The solute consumption method was used to detect the rate constants of ozone alone with sulfadiazine and sulfamethoxazole,and tertiary butanol was selected as a scavenging agent and pH was adjusted to 2.5 by adding orthophosphate buffers (OB);and the competition kinetics studying methodwith nitrobenzene as a reference was applied to measure the rate constants of hydroxyl radicals towards sulfadiazine and sulfamethoxazole,and pH was adjusted to 7.0 by adding OB.Results The rate constants of SD and SMX with ozone alone were 261 mol ‐1 dm 3 s ‐1 and 303 mol ‐1 dm3 s ‐1 by calculating in low reaction system.The rate constants of hydroxyl radicals with SD and SMX were 2.2×1010 mol ‐1 dm 3 s ‐1 and 2.7×1010 mol ‐1 dm 3 s ‐1,respectively.Moreover,the rate constants of hydroxyl radicals with SMX were found to have increased from 3.6×109 mol ‐1 dm 3 s ‐1 to 2.8×1010 mol ‐1 dm 3 s ‐1 with pH value rising from 5.0 to 7.8.Conclusion SMX and SD are both refractory to ozone oxidation alone,and are liable to be degraded by hydroxyl radicals,and the rate constants of SMX with the hydroxyl radical slightly increases with pH rise. | SUI MingHao XING SiChu ZHU ChunYan SHENG Li LU KeXiang GAO NaiYun | 2011 | Biomedical and Environmental Sciences2011，24，3： | 1 |
| 3 | Heterogeneous catalytic ozonation of ciprofloxacin in water with carbon nanotube supported manganese oxides as catalyst显示文摘 | Minghao Sui Sichu Xing Li Sheng Shuhang Huang Hongguang Guo | 2012 | Journal of Hazardous Materials2012，，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员