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sulfur cycle as an nitrate in a electron mediator between carbon and constructed wetland microcosm

Frontiers of Environmental Science & Engineering 2020年第4期14卷 17-29页

作者： Wenrui Guo Yue Wen Yi Chen Qi Zhou State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Key Laboratory of the Three Gorges Region's Eco-Environment Ministry of EducationCollege of Environment and EcologyChongqing UniversityChongqing 400044China

A constructed wetland microcosm was employed to investigate the sulfur cycle-mediated electron transfer between carbon and *** accepted electrons from organics at the average rate of 0.84 mol/(m3·d)through sulfate reduction,which accounted for 20.0%of the electron input *** remainder of the electrons derived from organics were accepted by dissolved oxygen(2.6%),nitrate(26.8%),and iron(III)(39.9%).The sulfide produced from sulfate reduction was transformed into acidvolatile sulfide,pyrite,and elemental sulfur,which were deposited in the substratum,storing electrons in the microcosm at the average rate of 0.52 mol/(m3·d).In the presence of nitrate,the acid-volatile and elemental sulfur were oxidized to sulfate,donating electrons at the average rate of 0.14 mol/(m3•d)and driving autotrophic denitrification at the average rate of 0.30 g N/(m3·d).The overall electron transfer efficiency of the sulfur cycle for autotrophic denitrification was 15.3%.A mass balance assessment indicated that approximately 50%of the input sulfur was discharged from the microcosm,and the remainder was removed through deposition(49%)and plant uptake(1%).Dominant sulfatereducing(i.e.,Desulfovirga,Desulforhopalus,Desulfatitalea,and Desulfatirhabdium)and sulfuroxidizing bacteria(i.e.,Thiohalobacter,Thiobacillus,sulfuritalea,and sulfurisoma),which jointly flilfilled a sustainable sulfur cycle,were *** results improved understanding of electron transfers among carbon,nitrogen,and sulfur cycles in constructed wetlands,and are of engineering significance.

关键词： Constructed wetland sulfur cycle Electron transfer Denitrification

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sulfur cycle in the typical meadow Calamagrostis angustifolia wetland ecosystem in the Sanjiang Plain,Northeast China

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Journal of Environmental Sciences 2008年第4期20卷 470-475页

作者： LIU Jingshuang LI Xinhua Northeast Institute of Geography and Agricultural Ecology Chinese Academy of Sciences Changchun 130012 China Shandong Institute of Agriculture Sustainable Development Jinan 250100 China

The sulfur cycle and its compartmental distribution within an atmosphere-plant-soil system was studied using a compartment model in the typical meadow Calamagrostis angustifolia wetland in the Sanjiang Plain Northeast China. The results showed that in the typical meadow C. angustifolia wetland ecosystem, soil was the main storage compartment and current hinge of sulfur in which 98.4% sulfur was accumulated, while only 1.6% sulfur was accumulated in the plant compartment. In the plant subsystem, roots and litters were the main storage compartment of sulfur and they remained 83.5% of the total plant sulfur. The calculations of sulfur turnover through the compartments of the typical meadow C. angustifolia wetland ecosystem demonstrated that the above-ground component took up 0.99 gS/m^2 from the root, of which 0.16 gS/m^2 was translocated to the roots and 0.83 gS/m^2 to the litter. The roots took in 1.05 gS/m^2 from the soil, subsequent translocation back to the soil accounted for 1.31 gS/m^2, while there was 1.84 gS/m^2 in the litter and the net transfer of sulfur to the soil was more than 0.44 gS/（m^2·a）. The emission of H2S from the typical meadow C. angustifolia wetland ecosystem to the atmosphere was 1.83 mgS/（m^2·a）, while carbonyl sulfide （COS） was absorbed by the typical meadow C. angustifolia wetland ecosystem from the atmosphere at the rate of 1.76 mgS/（m^2·a）. The input of sulfur by the rainfall to the ecosystem was 4.85 mgS/m^2 during the growing season. The difference between input and output was 4.78 mgS/m^2, which indicated that sulfur was accumulated in the ecosystem and may cause wetland acidify in the future.

关键词： the Sanjiang Plain typical meadow Calamagrostis angustifolia wetland ecosystem sulfur cycle

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Cracking the superheavy pyrite enigma: possible roles of volatile organosulfur compound emission

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National Science Review 2021年第10期8卷 101-114页

作者： Xianguo Lang Zhouqiao Zhao Haoran Ma Kangjun Huang Songzhuo Li Chuanming Zhou Shuhai Xiao Yongbo Peng Yonggang Liu Wenbo Tang Bing Shen School of Mathematical and Statistical Sciences Arizona State University Shaanxi Key Laboratory of Early Life and Environments Department of Geology Northwest University School of Earth Sciences and Engineering Nanjing University School of Physics Peking University Key Laboratory of Orogenic Belts and Crustal Evolution of the Ministry of Education and School of Earth and Space Science Peking University State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation and Institute of Sedimentary Geology Chengdu University of Technology State Key Laboratory of Continental Dynamics Northwest University State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Palaeoenvironment Chinese Academy of Sciences Department of Geosciences Virginia Polytechnic Institute and State University International Center for Isotope Effect Research Nanjing University

The global deposition of superheavy pyrite(pyrite isotopically heavier than coeval seawater sulfate in the Neoproterozoic Era and particularly in the Cryogenian Period) defies explanation using the canonical marine sulfur cycle system. Here we report petrographic and sulfur isotopic data(δS) of superheavy pyrite from the Cryogenian Datangpo Formation(660–650 Ma) in South China. Our data indicate a syndepositional/early diagenetic origin of the Datangpo superheavy pyrite, withS-enriched HS supplied from sulfidic(HS rich) seawater. Instructed by a novel sulfur-cycling model, we propose that the emission ofS-depleted volatile organosulfur compounds(VOSC) that were generated via sulfide methylation may have contributed to the formation ofS-enriched sulfidic seawater and superheavy pyrite. The global emission of VOSC may be attributed to enhanced organic matter production after the Sturtian glaciation in the context of widespread sulfidic conditions. These findings demonstrate that VOSC cycling is an important component of the sulfur cycle in Proterozoic oceans.

关键词： sulfur isotope organosulfur compound sulfur cycle Cryogenian Datangpo Formation

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