Objective Shale gas is as an important kind of unconventional natural gas,with a great resource potential,and its exploration and development has attracted much attention around the world.Organic matter（OM）pores are...Objective Shale gas is as an important kind of unconventional natural gas,with a great resource potential,and its exploration and development has attracted much attention around the world.Organic matter（OM）pores are a common constituent in shales and form the dominant pore network of many shale gas systems.展开更多
Fertilizer input for agricultural food production, as well as the discharge of domestic and industrial water pollutants, increases pressures on locally scarce and vulnerable water resources in the North China Plain. I...Fertilizer input for agricultural food production, as well as the discharge of domestic and industrial water pollutants, increases pressures on locally scarce and vulnerable water resources in the North China Plain. In order to：（a） understand pollutant exchange between surface water and groundwater,（b） quantify nutrient loadings, and（c） identify major nutrient removal pathways by using qualitative and quantitative methods, including the geochemical model PHREEQC） a one-year study at a wheat（Triticum aestivum L.） and maize（Zea mays L.） double cropping system in the Baiyang Lake area in Hebei Province, China, was undertaken. The study showed a high influence of low-quality surface water on the shallow aquifer. Major inflowing pollutants into the aquifer were ammonium and nitrate via inflow from the adjacent Fu River（up to 29.8 mg/L NH4-N and 6.8 mg/L NO3-N）, as well as nitrate via vertical transport from the field surface（up to 134.8 mg/L NO3-N in soil water）. Results from a conceptual model show an excess nitrogen input of about 320 kg/ha/a. Nevertheless,both nitrogen species were only detected at low concentrations in shallow groundwater,averaging at 3.6 mg/L NH4-N and 1.8 mg/L NO3-N. Measurement results supported by PHREEQC-modeling indicated cation exchange, denitrification, and anaerobic ammonium oxidation coupled with partial denitrification as major nitrogen removal pathways. Despite the current removal capacity, the excessive nitrogen fertilization may pose a future threat to groundwater quality. Surface water quality improvements are therefore recommended in conjunction with simultaneous monitoring of nitrate in the aquifer, and reduced agricultural N-inputs should be considered.展开更多
Between April 6 and 7,2017,President Xi Jinping of China and President Donald Trump of the United States held a summit meeting at the Mar-a-Lago Estate in Palm Beach,Florida.Around the summit,the trilateral interactio...Between April 6 and 7,2017,President Xi Jinping of China and President Donald Trump of the United States held a summit meeting at the Mar-a-Lago Estate in Palm Beach,Florida.Around the summit,the trilateral interaction between China,the United States and Russia became the focus of the world’s public opinions.展开更多
Since the 18th CPC National Congress,China has stood at a new historical point of departure,undergoing historical changes on top of the important achievements in development since the founding of the People’s Republi...Since the 18th CPC National Congress,China has stood at a new historical point of departure,undergoing historical changes on top of the important achievements in development since the founding of the People’s Republic and particularly since the adoption of the reform and open-up policy.Socialism with Chinese characteristics has entered a new展开更多
As China and the EU mark the 50th anniversary of their diplomatic relations this year,Beijing Review reporter Li Wenhan spoke with George N.Tzogopoulos,Senior Research Fellow at the Centre international de formation e...As China and the EU mark the 50th anniversary of their diplomatic relations this year,Beijing Review reporter Li Wenhan spoke with George N.Tzogopoulos,Senior Research Fellow at the Centre international de formation europeenne.In the interview,Tzogopoulos shared his insights on the evolving China-EU relations,the impact of China-U.S.interactions on Europe and the prospects for cooperation in areas such as green transition and global governance.展开更多
基金supported by the National Natural Science Foundation of China(grant No.41202103)China Postdoctoral Science Foundation(grant No. 2016M591350)
文摘Objective Shale gas is as an important kind of unconventional natural gas,with a great resource potential,and its exploration and development has attracted much attention around the world.Organic matter（OM）pores are a common constituent in shales and form the dominant pore network of many shale gas systems.
基金the Sino-Danish Centre for Education and Research, and the Technical University of Denmark for funding this project
文摘Fertilizer input for agricultural food production, as well as the discharge of domestic and industrial water pollutants, increases pressures on locally scarce and vulnerable water resources in the North China Plain. In order to：（a） understand pollutant exchange between surface water and groundwater,（b） quantify nutrient loadings, and（c） identify major nutrient removal pathways by using qualitative and quantitative methods, including the geochemical model PHREEQC） a one-year study at a wheat（Triticum aestivum L.） and maize（Zea mays L.） double cropping system in the Baiyang Lake area in Hebei Province, China, was undertaken. The study showed a high influence of low-quality surface water on the shallow aquifer. Major inflowing pollutants into the aquifer were ammonium and nitrate via inflow from the adjacent Fu River（up to 29.8 mg/L NH4-N and 6.8 mg/L NO3-N）, as well as nitrate via vertical transport from the field surface（up to 134.8 mg/L NO3-N in soil water）. Results from a conceptual model show an excess nitrogen input of about 320 kg/ha/a. Nevertheless,both nitrogen species were only detected at low concentrations in shallow groundwater,averaging at 3.6 mg/L NH4-N and 1.8 mg/L NO3-N. Measurement results supported by PHREEQC-modeling indicated cation exchange, denitrification, and anaerobic ammonium oxidation coupled with partial denitrification as major nitrogen removal pathways. Despite the current removal capacity, the excessive nitrogen fertilization may pose a future threat to groundwater quality. Surface water quality improvements are therefore recommended in conjunction with simultaneous monitoring of nitrate in the aquifer, and reduced agricultural N-inputs should be considered.
文摘Between April 6 and 7,2017,President Xi Jinping of China and President Donald Trump of the United States held a summit meeting at the Mar-a-Lago Estate in Palm Beach,Florida.Around the summit,the trilateral interaction between China,the United States and Russia became the focus of the world’s public opinions.
文摘Since the 18th CPC National Congress,China has stood at a new historical point of departure,undergoing historical changes on top of the important achievements in development since the founding of the People’s Republic and particularly since the adoption of the reform and open-up policy.Socialism with Chinese characteristics has entered a new
文摘As China and the EU mark the 50th anniversary of their diplomatic relations this year,Beijing Review reporter Li Wenhan spoke with George N.Tzogopoulos,Senior Research Fellow at the Centre international de formation europeenne.In the interview,Tzogopoulos shared his insights on the evolving China-EU relations,the impact of China-U.S.interactions on Europe and the prospects for cooperation in areas such as green transition and global governance.
