4篇
您的检索式：作者名="Ruanhong Cai"
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| 1 | Unveiling the enigma of refractory carbon in the ocean显示文摘INTRODUCTION The ocean holds a tremendous reservoir of refractory dissolved organic carbon (RDOC)that plays an important role in carbon cycling and climate change [1].However,the origin of the RDOC has been an enigma for half a century. This perspective is to address why the enigma deserves scientific efforts and illustrate a robust scheme--the Microbial Carbon Pump (MCP)-to unveil the enigma from molecular to ecosystem levels,Through generation of intrinsic RDOC (RDOCt)under specific biotic and abiotic environmental conditions,as well as through derivation of diverse organic molecules at extremely low concentrations (RDOCc). | Nianzhi Jiao Ruanhong Cai Qiang Zheng Kai Tang Jihua Liu Fanglue Jiao Douglas Wallace Feng Chen Chao Li Rudolf Amann Ronald Benner Farooq Azam | 2018 | National Science Review2018，5，4： | 10 |
| 2 | An implementation strategy to quantify the marine microbial carbon pump and its sensitivity to global change显示文摘INTRODUCTION The persistence of the vast pool of recalcitrant dissolved organic carbon (RDOC) in the deep ocean is fundamental to both global carbon cycling and global climate.Yet,quantitative understanding of the mechanisms that produce and utilize RDOC is still in its infancy.Moving from a conceptual framework to quantitative understanding in marine carbon cycling can take the international research community several decades--precious time that is not available in this era of anthropogenic dimate change.This perspective paper sets out an implementation strategy to move efficiently from conceptual hypotheses of marine carbon storage to quantification of the capacity for marine carbon storage through the microbial carbon pump (MCP),its sensitivity to global change and potential for modification.The aim is to excite and facilitate the intemational scientific community to hasten this process via an internationally co-ordinated multidisciplinary research initiative. | Carol Robinson Douglas Wallace Jung-Ho Hyun Luca Polimene Ronald Benner Yao Zhang Ruanhong Cai Rui Zhang Nianzhi Jiao | 2018 | National Science Review2018，5，4： | 4 |
| 3 | Excessive greenhouse gas emissions from wastewater treatment plants by using the chemical oxygen demand standard显示文摘Chemical oxygen demand(COD)is widely used as an organic pollution indicator in wastewater treatment plants.Large amounts of organic matter are removed during treatment processes to meet environmental standards,and consequently,substantial greenhouse gases(GHGs)such as methane(CH_(4))are released.However,the COD indicator covers a great amount of refractory organic matter that is not a pollutant and could be a potential carbon sink.Here,we collected and analysed COD data from 86 worldwide municipal wastewater treatment plants(WWTPs)and applied a model published by the Intergovernmental Panel on Climate Change to estimate the emission of CH_(4) due to recalcitrant organic compound processing in China’s municipal wastewater treatment systems.Our results showed that the average contribution of refractory COD to total COD removal was55%in 86 WWTPs.The amount of CH_(4) released from the treatment of recalcitrant organic matter in 2018 could have been as high as 38.22 million tons of carbon dioxide equivalent,which amounts to the annual carbon sequestered by China’s wetlands.This suggests that the use of COD as an indicator for organic pollution is undue and needs to be revised to reduce the emission of GHG.In fact,leaving nontoxic recalcitrant organic matter in the wastewater may create a significant carbon sink and will save energy during the treatment process,aiming at carbon neutrality in the wastewater treatment industry. | Zongqing LV Xiaoyu SHAN Xilin XIAO Ruanhong CAI Yao ZHANG Nianzhi JIAO | 2022 | Science China Earth Sciences2022，65，1： | 1 |
| 4 | Molecular characterization of organic matter transformation mediated by microorganisms under anoxic/hypoxic conditions显示文摘Dissolved organic matter(DOM) in the ocean is one of the largest carbon pools on Earth. Microbial metabolism is an important process that shapes the marine DOM pool. Current studies on the interactions between microorganisms and DOM focus mainly on oxic environments. Few studies have addressed the molecular characteristics of DOM in microbial-mediated transformation under anoxic/hypoxic conditions. As a result of deteriorating water quality due to eutrophication and global warming, anoxia occurs frequently in coastal waters. In this study, we performed an experiment to investigate changes in microbial community responses and the molecular characteristics of DOM in microbial-mediated transformation under hypoxic conditions. We compared microbial-mediated DOM transformation at different dissolved oxygen levels(7, 5, and 2 mg L^(-1)) and in different media(natural and artificial seawater with and without laminarin). We also investigated differences in DOM composition between groups using spectroscopic analysis and ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry. The results showed decreased microbial metabolic activity and delayed community succession at low oxygen(≤2 mg L^(-1)) in natural seawater supplemented with laminarin. The growth of strictly aerobic bacteria such as Pseudomonadaceae and Sphingomonadaceae was inhibited and the total organic carbon utilization rate was reduced by 36.9–46.7% from 4 to 32days. Moreover, tyrosine-like and tryptophan-like components were preserved, while DOM humification and modified aromaticity indices were significantly reduced under low oxygen conditions. This experiment provides justification for further study of the processes and mechanisms of improved labile DOM preservation in anoxic estuarine and coastal waters. | Shicong XIAO Jiaxin CHEN Yuan SHEN Qi CHEN Yu WANG Yunyun LI Chen HE Ruanhong CAI Quan SHI Nianzhi JIAO Qiang ZHENG | 2023 | Science China Earth Sciences2023，66，4： | 0 |
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