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| 1 | Atmospheric deposition of inorganic nitrogen in a semi-arid grassland of Inner Mongolia, China显示文摘Due to increasing global demand for crop production and energy use, more and more reactive nitrogen(Nr) has been generated and emitted to the environment. As a result, global atmospheric nitrogen(N) deposition has tripled since the industrial revolution and the ecological environment and human health have been harmed. In this study, we measured dry and wet/bulk N deposition from July 2013 to December 2015 in a semi-arid grassland of Duolun County, Inner Mongolia, China. The samples of dry and wet/bulk N deposition were collected monthly with a DELTA(DEnuder for Long Term Atmospheric sampling) system and with Gradko passive samplers and a precipitation gauge. The measured results show that the annual mean concentrations of NH_3, NO_2, HNO_3, particulate NH_4^+(pNH_4^+) and particulate NO_3^-(pNO_3^-) in atmosphere were 2.33, 1.90, 0.18, 1.42 and 0.42 μg N/m3, respectively, and that the annual mean volume-weighted concentrations of NH_4^+-N and NO_3^--N in precipitation were 2.71 and 1.99 mg N/L, respectively. The concentrations of Nr components(including NH_3, NO_2, HNO_3, p NH_4^+, pNO_3^-, NH_4^+-N and NO_3^--N) exhibited different seasonal variations. Specifically, NO_2 and HNO_3 exhibited higher concentrations in autumn than in summer, while the other Nr components(NH_3, pNH_4^+, pNO_3^-, NH_4^+-N and NO_3^--N) showed the highest values in summer. Based on measured concentrations of Nr components and their deposition velocities estimated using the GEOS-Chem global atmospheric chemical transport model, the calculated annual mean dry deposition fluxes were 3.17, 1.13, 0.63, 0.91 and 0.36 kg N/(hm^2·a) for NH_3, NO_2, HNO_3, p NH_4^+ and pNO_3^-, respectively, and the calculated annual mean wet/bulk deposition fluxes were 5.37 and 3.15 kg N/(hm^2·a) for NH_4^+-N and NO_3^--N, respectively. The estimated annual N deposition(including dry N deposition and wet/bulk N deposition) reached 14.7 kg N/(hm^2·a) in grassland of Duolun County, approaching to the upper limit of the N critical load(10–15 kg N/(hm^2·a)). Dry and wet/bulk deposition fluxes of all Nr components(with an exception of HNO_3) showed similar seasonal variations with the maximum deposition flux in summer and the minimum in winter. Reduced Nr components(e.g., gaseous NH_3 and p NH_4^+ in atmosphere and NH_4^+-N in precipitation) dominated the total N deposition at the sampling site(accounted for 64% of the total N deposition), suggesting that the deposited atmospheric Nr mainly originated from agricultural activities. Considering the projected future increases in crop and livestock production in Inner Mongolia, the ecological and human risks to the negative effects of increased N deposition could be increased if no mitigation measures are taken. | ZHANG Yibo XU Wen WEN Zhang WANG Dandan HAO Tianxiang TANG Aohan LIU Xuejun | 2017 | Journal of Arid Land2017，9，6： | 5 |
| 2 | The ion chemistry, seasonal cycle, and sources of PM 2.5 and TSP aerosol in Shanghai显示文摘 | Ying Wang Guoshun Zhuang Xingying Zhang Kan Huang Chang Xu Aohan Tang Jianmin Chen Zhisheng An | 2006 | Atmospheric Environment2006，，16： | 3 |
| 3 | The ion chemistry and the source of PM 2.5 aerosol in Beijing显示文摘 | Ying Wang Guoshun Zhuang Aohan Tang Hui Yuan Yele Sun Shuang Chen Aihua Zheng | 2005 | Atmospheric Environment2005，，21： | 3 |
| 4 | PM_(2.5)and water-soluble inorganic ion concentrations decreased faster in urban than rural areas in China显示文摘We investigated variations of PM_(2.5)and water-soluble inorganic ions chemical characteristics at nine urban and rural sites in China using ground-based observations.From 2015 to 2019,mean PM_(2.5)concentration across all sites decreased by 41.9μg/m~3with a decline of 46%at urban sites and 28%at rural sites,where secondary inorganic aerosol(SIAs)contributed to 21%(urban sites)and 17%(rural sites)of the decreased PM_(2.5).SIAs concentrations underwent a decline at urban locations,while sulfate(SO_(4)^(2–)),nitrate(NO_(3)^(–)),and ammonium(NH_(4)^(+))decreased by 49.5%,31.3%and 31.6%,respectively.However,only SO_(4)^(2–)decreased at rural sites,NO_(3)^(–)increased by 21%and NH_(4)^(+)decreased slightly.Those changes contributed to an overall SIAs increase in 2019.Higher molar ratios of NO_(3)^(–)to SO_(4)^(2–)and NH_(4)^(+)to SO_(4)^(2–)were observed at urban sites than rural sites,being highest in the heavily polluted days.Mean molar ratios of NH_(3)/NH_xwere higher in 2019 than 2015 at both urban and rural sites,implying increasing NH_xremained as free NH_(3).Our observations indicated a slower transition from sulfate-driven to nitrate-driven aerosol pollution and less efficient control of NO_(x)than SO_(2)related aerosol formation in rural regions than urban regions.Moreover,the common factor at urban and rural sites appears to be a combination of lower SO_(4)^(2–)levels and an increasing fraction of NO_(3)^(–)to PM_(2.5)under NH_(4)^(+)-rich conditions.Our findings imply that synchronous reduction in NO_(x)and NH_(3)emissions especially rural areas would be effective to mitigate NO_(3)^(–)-driven aerosol pollution. | Yangyang Zhang Aohan Tang Chen Wang Xin Ma Yunzhe Li Wen Xu Xiaoping Xia Aihua Zheng Wenqing Li Zengguo Fang Xiufen Zhao Xianlong Peng Yuping Zhang Jian Han Lijuan Zhang Jeffrey L.Collett Jr Xuejun Liu | 2022 | Journal of Environmental Sciences2022，34，12： | 2 |
| 5 | The ion chemistry, seasonal cycle, and sources of PM 2.5 and TSP aerosol in Shanghai显示文摘 | Ying Wang Guoshun Zhuang Xingying Zhang Kan Huang Chang Xu Aohan Tang Jianmin Chen Zhisheng An | 2006 | Atmospheric Environment2006，，16： | 2 |
| 6 | Concentrations and isotopic characteristics of atmospheric reactive nitrogen around typical sources in Beijing,China显示文摘With rapid economic growth in China,anthropogenic reactive nitrogen(Nr) emissions have more than doubled over the last two or three decades.Atmospheric Nr pollution is an environmental concern in China especially in megacities such as Beijing.In order to identify the impact of emission sources on atmospheric Nr pollution,we measured atmospheric Nr concentrations and their isotopic composition(δ^(15)N) dynamics at three typical sites:landfill,pig farm and road traffic sites in Beijing from April 2010 to March 2011.Passive samplers were used for monitoring ammonia(NH_3) and nitrogen dioxide(NO_2),two major Nr species,while their δ^(15)N values were measured by a diffusion method combined with mass spectrometer approach.The raw water pool of the landfill and fattening house of the pig farm were important NH_3 sources with mean NH_3 concentrations being 2,829 and 2,369 μg/m^3,respectively,while the road traffic site was a minor NH_3 source(10.6 μg/m^3).NH_3 concentrations at sites besides the landfill and roads were high in summer and low in winter due to the annual variation of temperature and the change of emission source intensity.In contrast,the NH_3 concentrations inside the pig farm house were high in winter and low in summer,for the barn windows were open in summer and closed in winter.The mean NO_2 concentrations were 89.8,32.9 and 23.0 μg/m^3 at the road traffic,the landfill and pig farm sites,respectively.Due to vehicle fuel combustion,NO_2 concentration at the road traffic was the highest among the three sources,and the road traffic was a main NO_2 emission source.PM10,p NH4+ and p NO3– concentrations in particulate matter were higher in summer than in winter(except PM10 for the pig farm).The δ^(15)NH_3 values ranged from –19.14‰ to 7.82‰,with an average of –0.05‰ for the landfill site,and the lowest values were observed in June and July.The δ^(15)NH_3 values for the pig farm site ranged from –29.78‰ to –14.05‰ with an average of –24.51‰,and the δ^(15)NH_3 values were more negative in summer than in the other seasons.The δ^(15)NO_2 values were –9.63‰ to 7.04‰ with an average of –3.72‰ for the road traffic site.The δ^(15)NO_2 values were more negative in summer than those in the other seasons.The different δ^(15)N values for the various Nr species in different sources may serve as important indicators for identifying atmospheric Nr sources in megacities.The results may also provide the theoretical basis for research on the atmospheric N deposition and its sources. | LIU Jieyun ZHANG Ying LIU Xuejun TANG Aohan QIU Husen ZHANG Fusuo | 2016 | Journal of Arid Land2016，8，6： | 2 |
| 7 | Cadmium pollution from phosphate fertilizers in arable soils and crops:an overview显示文摘The application of mineral and organic phosphorus fertilizers to arable land has greatly increased crop yield to meet the world food demand.On the other hand,impurities in these fertilizers,such as heavy metals,are being added to agricultural soils,resulting both from the raw materials themselves and the processes used to obtain the final product.Cadmium,a non-essential and toxic heavy metal,has been found in relatively high amounts in common P fertilizers obtained from sediments.This metal poses a high risk for soil fertility,crop cultivation,and plants in general.Furthermore,human health might be compromised by the cadmium concentrations in agricultural and livestock products,due to the bioaccumulation effect in the food web.The accumulation in the different matrixes is the result of the high mobility and flexible availability of this harmful metal.This review summarizes risks to human health,the factors influencing cadmium movement in soils and crop uptake,as well as common plant responses to its toxicity.In addition,it summarizes cadmium balances in soils,trends,long-term experiments,and further studies.Cadmium inputs and outputs in arable soil,together with their calculated concentrations,are compared between two different regions:the European countries(in particular Germany)and China.The comparison appears useful because of the different proportions in the inputs and outputs of cadmium,and the diverse geographical,environmental and social factors.Moreover,these variables and their influences on cadmium contamination improve the understanding of the pollution from phosphate fertilizers and will help to establish future mitigation policies. | Andrea Giovanna NINO-SAVALA Zhong ZHUANG Xin MA Andreas FANGMEIER Huafen LI Aohan TANG Xuejun LIU | 2019 | Frontiers of Agricultural Science and Engineering2019，6，4： | 2 |
| 8 | The evolution of chemical components of aerosols at five monitoring sites of China during dust storms显示文摘 | Wang Ying Zhuang Guoshun Tang Aohan | 2007 | Atmospheric Environment2007，41，5： | 1 |
| 9 | Chemical characteristics of PMr 5 and PMio in Haze-fog episodes in Beijing显示文摘 | SUN Yele ZHUANG Guoshun TANG Aohan | 2006 | Environment Science & Technology2006，40，： | 1 |
| 10 | The Chemistry of Precipitation and Its Relation to Aerosol in Beijing显示文摘 | Aohan Tang Guoshun Zhuang Ying Wang | 2005 | Atmospheric Environment2005，39，19： | 1 |
| 11 | The chemistry of precipitation and its relation to aerosol in Beijing 显示文摘 | TANG Aohan ZHUANG Guoshun WANG Ying | 2005 | Atmospheric Environment2005，39，19： | 1 |
| 12 | Chemicalrharacteristics of PM2^ and PM m in Haze-Fog episodes inBeijing显示文摘 | Sun Yele Zhuang Guoshun Tang Aohan | 2006 | Environmental Science & Technology2006，40，： | 1 |
| 13 | The ion chemistry and the source of PM 2.5 aerosol in Beijing显示文摘 | Ying Wang Guoshun Zhuang Aohan Tang Hui Yuan Yele Sun Shuang Chen Aihua Zheng | 2005 | Atmospheric Environment2005，，21： | 1 |
| 14 | Theevolution of chemical components of aerosols at five monitoring sitesof China during dust storms 显示文摘 | WANG Ying ZHUANG Guoshun TANG Aohan | 2007 | Atmos Environ2007，41，5： | 1 |
| 15 | The chemistry of the severe acidic precipitation in Shanghai, China显示文摘 | Kan Huang Guoshun Zhuang Chang Xu Ying Wang Aohan Tang | 2008 | Atmospheric Research2008，，1： | 1 |
| 16 | Impacts of Pollution Controls on Air Quality in Beijing during the 2008 Olympic Games显示文摘 | Shen Jianlin Tang Aohan Liu Xuejun Kopsch Jenny Fangmeier Andreas Goulding Keith Zhang Fusuo | 2011 | EN2011，，1： | 1 |
| 17 | The ion chemistry and the source of PM 2.5 aerosol in Beijing显示文摘 | Ying Wang Guoshun Zhuang Aohan Tang Hui Yuan Yele Sun Shuang Chen Aihua Zheng | 2005 | Atmospheric Environment2005，，21： | 1 |
| 18 | High concentrations and dry deposition of reactive nitrogen species at two sites in the North China Plain显示文摘 | Shen Jianlin Tang Aohan Liu Xuejun | 2009 | Environmental Pollution2009，157，11： | 1 |
| 19 | Chemical characteristics of PMzs and PM10 in haze-fog episodes in Bei- jing显示文摘 | Yele Sun Guoshun Zhuang Aohan Tang | 2006 | Environ Sci Technol2006，40，10： | 1 |
| 20 | Theevolution of chemical components of aerosols at five monitoring sitesof China during dust storms 显示文摘 | WANG Ying ZHUANG Guoshun TANG Aohan | 2007 | Atmos Environ2007，41，5： | 1 |
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