土壤有机磷(P_(o))是土壤中重要的磷库,其形态、含量与生物有效性随成土过程而发生变化,进而影响土壤磷素供应、养分平衡及生态系统生产力。然而,与土壤无机磷(P_(i))相比,以往的研究对P_(o)的重视不够,这主要是由于土壤中P_(o)的提取...土壤有机磷(P_(o))是土壤中重要的磷库,其形态、含量与生物有效性随成土过程而发生变化,进而影响土壤磷素供应、养分平衡及生态系统生产力。然而,与土壤无机磷(P_(i))相比,以往的研究对P_(o)的重视不够,这主要是由于土壤中P_(o)的提取、分析和鉴定方法难于P_(i)。近年来,随着液相^(31)P核磁共振(^(31) P NMR)波谱技术在土壤学领域的应用,为定量分析土壤P_(o)组分及含量提供了新的技术手段,同时为更好地理解生态系统演化过程中不同形态P_(o)的转化特征奠定了基础。本文主要总结了土壤P_(o)的种类和性质,介绍了液相^(31)P NMR分析土壤P_(o)的原理和方法,在此基础上综述了自然成土过程中不同形态P_(o)的转化特征及其影响因素,并指出了需进一步研究的方向和关键科学问题:包括量化成土过程中不同形态P_(o)转化速率、途径与环境阈值,阐明不同发育阶段土壤P_(o)与C、N等养分之间的耦合关系及其固释机理,构建不同类型土壤P_(o)演化模型。回答上述问题有助于更好地理解地球关键带磷素生物地球化学循环,为不同发育阶段土壤养分管理与调控及土壤资源可持续利用提供理论依据。展开更多
IN a bid to support green transportation,China has implemented a series of programs to boost the market for new energy vehicles,or NEVs,since 2010.Governmental subsidies are available for the purchase of NEVs.In some ...IN a bid to support green transportation,China has implemented a series of programs to boost the market for new energy vehicles,or NEVs,since 2010.Governmental subsidies are available for the purchase of NEVs.In some cities,NEVs are exempted from the license-plate lottery or traffic restrictions which are aimed展开更多
HUANI,40,from Shandong runs an international freight forwarding firm.She revolutionized her business mode after a conversation with the proprietor of a coffee shop during a recent trip to Switzerland.He told her that ...HUANI,40,from Shandong runs an international freight forwarding firm.She revolutionized her business mode after a conversation with the proprietor of a coffee shop during a recent trip to Switzerland.He told her that the coffee she was drinking had just arrived from China via specialized rail freight,in half the time it would have taken by ocean carriage.Ground coffee imported this way is fresher,with a mellower aroma.展开更多
HENGQIN New Area was established on December 16,2009 in southern Zhuhai City,Guangdong Province.Covering 106.46 square kilometers,it triples the size of Macao.Across a river from each other,the two are connected at th...HENGQIN New Area was established on December 16,2009 in southern Zhuhai City,Guangdong Province.Covering 106.46 square kilometers,it triples the size of Macao.Across a river from each other,the two are connected at their shortest distance by a bridge less than 200 meters long.Hengqin is 34 miles from Hong Kong.After the opening of the Hong KongZhuhai-Macao Bridge,scheduled for2016,Hengqin will become the only national new area directly connected to Hong Kong and Macao.展开更多
AT the opening ceremony of the Sixth Ministerial Conference of the China-Arab States Cooperation Forum last June,President Xi Jinping mentioned a Jordanian businessman who settled in Yiwu,a coastal city in Zhejiang Pr...AT the opening ceremony of the Sixth Ministerial Conference of the China-Arab States Cooperation Forum last June,President Xi Jinping mentioned a Jordanian businessman who settled in Yiwu,a coastal city in Zhejiang Province."The rapid development of relations between China and Arab countries drew their peoples together,"Xi remarked."There is a Jordanian,Muhannad,in Yiwu where Arabic businesspeople congregate.He set up an Arabic restaurant,and prospered along with the city.He has since married a Chinese woman and settled in China.An ordinary young Arab,weav-展开更多
USUALLY each city has its own area code,but when I called one of my classmates in the U.S.the display on his telephone showed codes for three cit ies(Changsha,Xiangtan and Zhuzhou)He was puzzled and asked me whether I...USUALLY each city has its own area code,but when I called one of my classmates in the U.S.the display on his telephone showed codes for three cit ies(Changsha,Xiangtan and Zhuzhou)He was puzzled and asked me whether I had opened companies in all three cities.I told him that as a city group the three cities use a unified area code–one of the results of regional econom ic integration.My company is in展开更多
THE Beijing-centered economic circle has been on the table for several years.The Overall Plan for Beijing Urban Construction in 1982 proposed a capital economic circle.In November of 2004,the National Development and ...THE Beijing-centered economic circle has been on the table for several years.The Overall Plan for Beijing Urban Construction in 1982 proposed a capital economic circle.In November of 2004,the National Development and Reform Commission(NDRC)formally proposed the regional development plan for the Beijing-Tianjin-Hebei bloc.It was reiterated in the nation’s 12th Five-year Plan(2011-2015)for social and economic development.Thereafter the capital economic circle has been upgraded to a national priority.China’s new leadership attaches展开更多
THE water treatment method most commonly used today was formulated in Belgium in 1902.Entailing the four steps of flocculation,sedimentation,filtration,and disinfection,it played an important role in facilitating econ...THE water treatment method most commonly used today was formulated in Belgium in 1902.Entailing the four steps of flocculation,sedimentation,filtration,and disinfection,it played an important role in facilitating economic and social development in the last century.Since the1980s,when chemical fertilizer began being used and promoted in China,the country’s water resources have become polluted to varying extents.The traditional method of water treatment展开更多
IN recent years, China has made tremendous efforts in its fight to prelect intellectual property rights (IPR) and its crackdown on copyright infringements, In 2004 alone, more than 85 million pirated commodities were ...IN recent years, China has made tremendous efforts in its fight to prelect intellectual property rights (IPR) and its crackdown on copyright infringements, In 2004 alone, more than 85 million pirated commodities were comfiscated; 653 people were jailed for IPR infringements, and the Supreme People's Court lowered the threshold to file a lawsuit against IPR violations from US $24,000 to US $6,000.展开更多
文摘土壤有机磷(P_(o))是土壤中重要的磷库,其形态、含量与生物有效性随成土过程而发生变化,进而影响土壤磷素供应、养分平衡及生态系统生产力。然而,与土壤无机磷(P_(i))相比,以往的研究对P_(o)的重视不够,这主要是由于土壤中P_(o)的提取、分析和鉴定方法难于P_(i)。近年来,随着液相^(31)P核磁共振(^(31) P NMR)波谱技术在土壤学领域的应用,为定量分析土壤P_(o)组分及含量提供了新的技术手段,同时为更好地理解生态系统演化过程中不同形态P_(o)的转化特征奠定了基础。本文主要总结了土壤P_(o)的种类和性质,介绍了液相^(31)P NMR分析土壤P_(o)的原理和方法,在此基础上综述了自然成土过程中不同形态P_(o)的转化特征及其影响因素,并指出了需进一步研究的方向和关键科学问题:包括量化成土过程中不同形态P_(o)转化速率、途径与环境阈值,阐明不同发育阶段土壤P_(o)与C、N等养分之间的耦合关系及其固释机理,构建不同类型土壤P_(o)演化模型。回答上述问题有助于更好地理解地球关键带磷素生物地球化学循环,为不同发育阶段土壤养分管理与调控及土壤资源可持续利用提供理论依据。
文摘IN a bid to support green transportation,China has implemented a series of programs to boost the market for new energy vehicles,or NEVs,since 2010.Governmental subsidies are available for the purchase of NEVs.In some cities,NEVs are exempted from the license-plate lottery or traffic restrictions which are aimed
文摘HUANI,40,from Shandong runs an international freight forwarding firm.She revolutionized her business mode after a conversation with the proprietor of a coffee shop during a recent trip to Switzerland.He told her that the coffee she was drinking had just arrived from China via specialized rail freight,in half the time it would have taken by ocean carriage.Ground coffee imported this way is fresher,with a mellower aroma.
文摘HENGQIN New Area was established on December 16,2009 in southern Zhuhai City,Guangdong Province.Covering 106.46 square kilometers,it triples the size of Macao.Across a river from each other,the two are connected at their shortest distance by a bridge less than 200 meters long.Hengqin is 34 miles from Hong Kong.After the opening of the Hong KongZhuhai-Macao Bridge,scheduled for2016,Hengqin will become the only national new area directly connected to Hong Kong and Macao.
文摘AT the opening ceremony of the Sixth Ministerial Conference of the China-Arab States Cooperation Forum last June,President Xi Jinping mentioned a Jordanian businessman who settled in Yiwu,a coastal city in Zhejiang Province."The rapid development of relations between China and Arab countries drew their peoples together,"Xi remarked."There is a Jordanian,Muhannad,in Yiwu where Arabic businesspeople congregate.He set up an Arabic restaurant,and prospered along with the city.He has since married a Chinese woman and settled in China.An ordinary young Arab,weav-
文摘USUALLY each city has its own area code,but when I called one of my classmates in the U.S.the display on his telephone showed codes for three cit ies(Changsha,Xiangtan and Zhuzhou)He was puzzled and asked me whether I had opened companies in all three cities.I told him that as a city group the three cities use a unified area code–one of the results of regional econom ic integration.My company is in
文摘THE Beijing-centered economic circle has been on the table for several years.The Overall Plan for Beijing Urban Construction in 1982 proposed a capital economic circle.In November of 2004,the National Development and Reform Commission(NDRC)formally proposed the regional development plan for the Beijing-Tianjin-Hebei bloc.It was reiterated in the nation’s 12th Five-year Plan(2011-2015)for social and economic development.Thereafter the capital economic circle has been upgraded to a national priority.China’s new leadership attaches
文摘THE water treatment method most commonly used today was formulated in Belgium in 1902.Entailing the four steps of flocculation,sedimentation,filtration,and disinfection,it played an important role in facilitating economic and social development in the last century.Since the1980s,when chemical fertilizer began being used and promoted in China,the country’s water resources have become polluted to varying extents.The traditional method of water treatment
文摘IN recent years, China has made tremendous efforts in its fight to prelect intellectual property rights (IPR) and its crackdown on copyright infringements, In 2004 alone, more than 85 million pirated commodities were comfiscated; 653 people were jailed for IPR infringements, and the Supreme People's Court lowered the threshold to file a lawsuit against IPR violations from US $24,000 to US $6,000.
