检索结果-南通市图书馆

Science china Earth Sciences 2007年第S1期 107-114页

作者： WEI Jiang1,2,3, ZHANG XiMing1, SHAN LiShan1,2, YAN HaiLong1,2 & LIANG ShaoMing1,2 1 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, ürümqi 830011, china 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, china 3 ürümqi environmental protection bureau, ürümqi 830063, china

Through measuring the above/below-ground growth data of Haloxylon ammodendron seedlings at different stages in hinterland of the desert the results show that the *** seedling growth has demonstrated different adaptation characteristics in the continued arid environment with time and space. In May, July, September and October, the growth speed of vertical root is 0.607 cm/d,0.809 cm/d,0.155 cm/d and 0.394 cm/d, respectively; the growth speed of height is 0.093 cm/d,0.076 cm/d, 0.408 cm/d and 136 cm/d, respectively. It is explained that seedlings root system has the growth superiority in space. The maximum growth speed of below-ground (vertical root and horizontal root) of seedling is earlier than that of above-ground (height and horizontal of shoot). In the different periods, the vertical growth speed and the horizontal growth speed of below-ground is 2-10 times and 3-5 times than the height increase speed and the shoot growth speed, respectively. In the whole season, the growth speed of above/below-ground of seedlings shows the alternation growth tendency. At the different periods, the root/shoot ratio of H. ammodendron seedlings is 0.41,0.3,0.39 and 0.88. All these characteristics are the comprehensive performance of seedlings' strategy selection to adapt to the continued arid environment.

关键词： root systems growth speed allocation root/shoot ratio adaptation strategy

Water pricing towards sustainability of water resources: a case study in Beijing

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2002年第4期14卷 518-523页

作者： LIU Shao (Guangzhou research Institute of environmental protection, Guangzhou 510620, china. ) Guangzhou Heseureh Institute of environmental protection Guangzhou 510620

The role of water pricing for managing water resources is widely recognized in many areas of the world because of the increasing scarcity of water resources, a high competition between water uses and environmental degradation. Based on the analysis of cost of water, this paper explores which types of cost should be reflected in the water pricing enhancing the sustainability of water resources. The principle of full cost pricing in which the cost should include supply cost, opportunity cost and externalities is proposed as a means to achieve the sustainability of water resources. In a case study of Beijing, low water price is analyzed as one reason for unsustainable water consumption. Thus water pricing justified is necessary and pressing. It is proposed to justify water price in phased manner and eventually towards full cost pricing. The assessment of impacts on water resources by raising water price shows water pricing could alleviate the conflict between water supply and demand. This paper concludes that water pricing can play an effective role in enhancing the sustainability of water resources in Beijing.

关键词： water resources water price cost full cost pricing sustainability Beijing

Determination of photochemically-generated reactive oxygen species in natural water

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2009年第3期21卷 303-306页

作者： ZHAN Manjun Nanjing research Institute of environmental protection,Nanjing 210013,china. [a]Nanjing research Institute of environmental protection Nanjing 210013 China

reactive oxygen species （rOS） can be produced by interactions between sunlight and light-absorbing substances in natural water environment. rOS may participate in the indirect photolysis of trace organic pollutants, therefore resulting in changes in their environmental fates and ecological risks in natural water systems. Bisphenol A （BPA）, an endocrine-disrupting chemical, exits widely in natural waters. The photodegradation of BPA promoted by rOS （-OH, 1O2, HO2./O2^-）, which were produced on the excitation of ubiquitous constituents （such as nitrate ion, humic substances and Fe（Ⅲ）-oxalate complexes） in natural water under simulated solar radiation was investigated. Both molecular probe method and electron spin resonance （ESr） test were used for the characterization of the generated rOS. It was found that .OH was photochemically produced in the presence of nitrate ions, humic substances and Fe（Ⅲ）-oxalate complexes and that 102 was produced with the presence of humic substances. The steady-state concentrations of .OH was 1.27×10^-14 mol/L in a nitrate solution, and the second-order rate constant of BPA with ＂OH was 1.01×10^10 L/（mol.s）.

关键词： reactive oxygen species Bisphenol A hydroxyl radicals singlet oxygen superoxide anion radical photodegradation

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2005年第12期15卷 1110-1116页

作者： LIU Gang,LI Xin,JIANG Weimei and LI Min Department of Atmospheric Sciences,Nanjing University,Nanjing 210093,china Beijing Municipal environmental protection bureau,Beijing 100044,china Department of Atmospheric Sciences Nanjing University Nanjing 210093 China. Beijing Municipal environmental protection bureau Beijing 100044 China

The S-L (She and Leveque) scaling law,also named the hierarchical similarity theory,has been extensively tested for the turbulence made in the laboratory,but seldom been tested for the turbulence in the atmospheric boundary layer (ABL).In this paper, the S-L scaling law is applied to the turbulence in the ABL observed under unstably stratified conditions and over different types of underlying *** results of analyses show that over this type of homogeneous and flat underlying surface,such as the underlying surface in HUBEX (Huaihe river Basin Energy and Water Cycle Experiment),vertical speed and temperature fields well satisfy the S-L scaling *** the turbulence over the homogeneous but rather rough underlying surface of forest and under unstably stratified conditions in PFrD (Park Falls ranger District of the Chequamegon National Forest,Wisconsin,USA),the analyses show that the vertical speed and temperature fields sometimes conform sometimes do not conform to the S-L scaling ***,at a time,either both of the vertical speed and temperature fields conform to the S-L scaling law,or both of them do *** speed fields in both of the field experiments do not satisfy the S-L scaling *** new explanation of the above-mentioned phenomena is given.

关键词： atmospheric turbulence reynolds number S-L scaling law in the atmospheric turbulence boundary layer processes nonlinear dynamics

Nature　reserve　construction　and　its　contribution　to　the　biodiversity　conservation　in　china　mainland

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of environmental Sciences 1996年第1期8卷 15-20页

作者： Jiang Mingkang Xue Dayuan(Nanjing Institute of environmental Science, National environmental protection Agency, Nanjing 210042,china ) china

By the end of 1993, 763 nature reserves were established in china with a total area of 66184.1 kha, occupied proximally 6. 84% of the whole country's land *** reserves concerning biodiversity conservation include ecosystem categories of forest, grassland, desert, terrestrial wetland and waters, ocean and coast and categories of wild animal and wild plant. Based on the construction of the reserves, the contributions of the reserves of various categories to the biodiversity conservation and the existed shortages for the reserve construction in china were analyzed thoroughly in this paper.

关键词： nature reserve protected area reserve construction biodiversity conservation.

To take a clean technology as a strategy for pollution control in industry

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 1993年第1期5卷 90-98页

作者： Shi QingNational environmental protection Agency, Beijing 100035, chinaLiu XishuNational Natural Science Foundation of china, Beijing 100083, china china

A clean technology in thermal power station by adding of limestone into coal for getting the co-melted compounds was studied. Comparing with conventional technology, the quantity of ash discharged is decreased from 85% to 15%, the water consumption is 80% less than traditional method. The slag discharged could be used as raw materials for cement and bricks. In addition, the SO2 content is decreased as well.

关键词： thermal power station pollution control clean technology.

Analysis on the coupling law between economic development and the environment in ürümqi city

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2007年第S1期 149-158页

作者： WANG HongWei1,2, ZHANG XiaoLei1, WEI ShanFeng3 & KANG Hong4 1 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, ürümqi 830011, china 2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, china 3 china National environmental Monitoring Centre, Beijing 100029, china 4 Xinjiang environmental Monitoring Station, ürümqi 830011, china

The inter-coupling relationship between urban economic development and the ecological environment refers to the total of interactive, inter-influenced and other non-linear relations between economic and environmental systems in the course of economic development. Taking ürümqi, an oasis city in arid region, as an example, we collected the data of environmental quality & pollutants discharge and information on economic development in the 20 years, analyzed the correlation between the two, con-ducted a fitted regression with quadratic and cubic equations, and acquired 14 mathematic models that could describe the relationship between the environment and economic development. The results show that there exists a coordinated and interactive relationship between the environment and economic development. On the basis of these quantity analyses, conceptional frame model is built to explain the fundamental basis of this environmental coupling in ürümqi city. Both a quantitative analysis of the coupling law and a good command of the internal law between them are useful for making com-prehensive decisions about the environment and economic development and harmonizing the urban sustainable development.

关键词： oasis city ürümqi environmental Kuznets curve coupling law

Quantum dots enhance Cu^(2+)-induced hepatic L02 cells toxicity

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2010年第12期22卷 1987-1992页

作者： Yuxia Zhao,Kuangfei Lin,Wei Zhang,Lili Liu State environmental protection Key Laboratory of environmental risk Assessment and Control on Chemical Process,Shanghai 200237,china [a] State environmental protection Key Laboratory of environmental risk Assessment Control on Chemical Process Shanghai 200237 China. E-mail: maryzyx@***

As a new class of xenogenous nanoparticle, quantum dots （QDs） possess the potential to co-exist with Cu^2＋ in human liver. The combined toxicity is thus concerned. Considering QDs and Cu^2＋ are known rOS （reactive oxygen species） inducer, we investigated the combined oxidative stress and corresponding protective strategy using human hepatic L02 cells. The results demonstrated that the presence of a small amount of MPA-CdTe QDs （2 μg/mL） in a Cu^2＋ solution （2.5-20 μg/mL） resulted in a higher toxicity with up to 8-fold cell viability decrease, which was accompanied by cell morphology changes. The combined toxicity was then confirmed as rOS associated oxidative stress with up to 300% and 35% increase of the intracellular rOS level and glutathione S-transferase （GST） activity, respectively. N-acetylcysteine （NAC） can also provide almost complete protection against the induced toxicity. Therefore, the rOS associated oxidant injury might be responsible for the QDs-Cu^2＋/Cu^2＋ induced toxicity and could be balanced through cytoprotective antioxidant enzyme GST.

关键词： quantum dots hepatic L02 cell reactive oxygen species glutathione S-transferase

Photocatalytic decolorization of dispersol dyes

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 1994年第2期6卷 244-251页

作者： You Daoxin Dai Shugui(Department of environmental Scienee, Nankai University, Tianjin 300071, china)Xie Huasheng(Tianjin environmental protection bureau, Tianjin 300191, china)

Dispersol dyes were photodegradated by solar-illuniinated catalysts. The effect of catalysttype, catalyst amount, PH, irradiation time, reaction medium and DO on decolorization efficiencywere discussed in *** dyes decolorized rapidly and decomposed to inorganic carbon finally. Thephotodegradation intermediates were analyzed with UV. Ir and GC/MS, which showed that benzenering wns opened and alkylates were *** of dispersol yellow-brown wastewater by solar-illuminated catalyst obtainedsatisfactory results: decolorized 86.7% and COD decreased 48.2%, which means that photocatalytictreatment of color wastewater is practical.

关键词： dye photocatalytic degradation wastewater treatment.

Outline and management of industrial wastewater in china

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 1996年第4期8卷 434-442页

作者： Chen Xingwu Li Qingshu (china National environmental protection Agency (NEPA),Beijing 100037, china) china Natl. Environ. Protect. Agency Beijing 100037 China

The essay covers the discharge and percentage of treatment of industrial wastewater in china before 1992,the analysis of industrial wastewater pollution to the environment and the problems and corrective measures to prevent and control the pollution caused by industrial wastewater in *** pollution is one of main environrnental problems in china. And industrial wastewater is a very important source to make water pollution. It is a key task to prevent industrial wastewater pollution and protect water quality of rivers, lakes (reservoirs), underground water in Chinese water environmental management.

关键词： industrial wastewater environmental rnanagement china.