检索结果-南通市图书馆

Progresses on Phase Chemistry of Aqueous Borate Systems at Low Temperature

在线全文

cnki会议

学校读者我要写书评

暂无评论

Progresses on Phase Chemistry of Aqueous Borate Systems at L...

第十六届全国化学热力学和热分析学术会议

作者： Li-Juan Yang~1,Dong-Liang Shen~1,Ya-Fei Guo~1,Shi-Qiang Wang~1,Tian-Long Deng~(1,2. 1 Tianjin Key Laboratory of Marine Resources and Chemistry,College of Marine Science and Engineering, Tianjin University of Science and Technology Tianjin,300457,PRC 2.ACS Key Laboratory of salt Lake Resources and Chemistry,qinghai Institute of salt lakes,chinese academy of sciences.xining,810008,PRC

＜正＞Boron and its compounds as vital chemical raw materials are widely used in glass,metallurgy, enamel,agriculture field and daily chemical department,and so on Boron mineral resources exist either with solid boron ores in the northeast of china or liquid boron-containing salt lake brines in the {2.-Tibet plateau in *** boron minerals as well as magnesium borate type of

关键词： Phase chemistry phase diagram solubility low temperature

The Eco-Geographical Distribution and Floristic Characteristics of Pteridophyte from the East Kunlun Mts. and Adjacent Area in china

在线全文

cnki会议

学校读者我要写书评

暂无评论

The Eco-Geographical Distribution and Floristic Characterist...

作者： Wu Yuhu Northwest Plateau Institute of Biology, chinese academy of {2. xining 810001,P.R. china

＜正＞According to the statistical data of Pteridophyte, this paper discussed the species, families and genera source and the distribution of Pteridophyte in east Kunlun Mts. of the qinghai-Xizang （Tibet） Plateau. The ecological condition of Pteridophyte in this region has also been preliminarily studied. The author thought that the flora of Pteridophyte in east Kunlun Mts. and the adjacent area is young with poor species, simple ecological forms, and small scope of distribution. It converged wide temperate and anti-cold terrestrial species which came from the surrounding floras. This flora is a border distributive district of Pteridophyte in china. Among the ecological factors, low temperature is the key factor restricting the growth, development and the formation of the ecological characteristics and the distributive patterns of Pteridophyte in the region.

关键词： East Kunlun Mts. Pteridophyte eco-geographical distribution

LITHIUM RESOURCES IN china'S salt {2. & ITS SUSTAINABLE DEVELOPMENT

在线全文

cnki会议

学校读者我要写书评

暂无评论

Bulletin of the chinese academy of {2. 1999年第4期13卷 225-229页

作者： Ma Peihua & Zhang Pengxi(qinghai Institute of salt {2., CAS)

This article gives an introductory exposition of the growing demands of lithium on the market against the background of current rapid S&Tprogress and booming economic development, the worldwide trend in the production of lithium salts and the rich lithium reserves in china’s salt lakes as well as the brilliant prospects for its exploitation in the future. The article proposes that a sustainable exploitation of the lithium trove from these salt lakes should be rooted in comprehensive utilization of the trove and take a long-term approach, emphasizing high value proliferation in developing quality lithium-based products. Also, it expresses some tentative ideas on building demonstration bases for all-round exploitation and utilization of the salt lake resources and the development of lithium cells.

关键词： ITS SUSTAINABLE DEVELOPMENT In LITHIUM RESOURCES IN china’S salt {2.

The Strategy of Grassland Resources,Eco-Environment and Sustainable Development on the qinghai-Tibet Plateau

在线全文

学校读者我要写书评

暂无评论

The Strategy of Grassland Resources,Eco-Environment and Sust...

作者： Wang Qiji,Wang Wenying Li Yingnian Zhang Yaosheng Lang Baining and Ma YushouNorthwest Plateau Institute of Biology,chinese academy of {2.xining 810008,P. R. chinaacademy of Animal Husbandry and Veterinary Medicine of qinghai,xining 810003,P. R. china

In this paper we analyzed geographical location,climatic condition,grassland resource,eco-environment and trend of development in qinghai-Xizang *** results suggested thatthere are irrational ecological structure on grassland,backward management and administrativelevel,overgrazing,rodent Pest,serious soil erosion and artificial *** these are themain reasons for grassland degradation and deterioration of eco-environment that hindersustainable development of animal husbandry of *** to the above-mentionedproblems,the following strategies should be adopted:uhtilizing natural grassland rationally,makingoptimum productive structure of grassland,improving breeds of sheep,carrying out seasonalproduction of animal husbandry,setting up artificial grassland with stable and high yield,supervising and determining grassland resource and carrying out demonstration research ofsustainable *** these are effective channels to prevent grassland from beingdegenerated and to Prompte economic benefit of animal husbandry.

关键词： qinghai-Tibet Plateau,grassland resources,eco-environment,management strategy

EXPLOITATION & DEVELOPMENT OF china'S salt LAKE RESOURCES

在线全文

cnki会议

学校读者我要写书评

暂无评论

Bulletin of the chinese academy of {2. 1997年第2期11卷 130-134页

作者： Liu Dejiang(qinghai Institute of salt {2., CAS) Song Pengsheng(qinghai Provincial S&T Commission)

This article recounts the current state of the research, developmemt and exploitation of the salt-lake resources in china’s hinterland with emphasis placed on those in {2. Province. It suggests that R&D input in and exploitation of the resources be stepped up, as this is of vital significance in boosting the regional economy of northwest china.

关键词： EXPLOITATION DEVELOPMENT OF china’S salt LAKE RESOURCES Lake than

Changes in plant biomass and species composition of alpine Kobresia meadows along altitudinal gradient on the qinghai-Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Science china(Life sciences. 2008年第1期51卷 86-94页

作者： WANG ChangTing1,3, CAO GuangMin1, WANG QiLan1, JING ZengChun1, DING LuMing1 & LONG RuiJun2.1 Northwest Institute of Plateau Biology, chinese academy of {2. xining 810001, china 2.College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730070, china 3 Graduate University of the chinese academy of {2. Beijing 100039, china 1. Northwest Institute of Plateau Biology Chinese Academy of Sciences Xining 810001 China 3. Graduate University of the chinese academy of {2. Beijing 100039 China 2. College of Pastoral Agriculture Science and Technology Lanzhou University Lanzhou 730070 China

Alpine Kobresia meadows are major vegetation types on the qinghai-Tibetan Plateau. There is growing concern over their relationships among biodiversity, productivity and environments. Despite the im-portance of species composition, species richness, the type of different growth forms, and plant bio-mass structure for Kobresia meadow ecosystems, few studies have been focused on the relationship between biomass and environmental gradient in the Kobresia meadow plant communities, particularly in relation to soil moisture and edaphic gradients. We measured the plant species composition, her-baceous litter, aboveground and belowground biomass in three Kobresia meadow plant communities in Haibei Alpine Meadow Ecosystem Research Station from 2.01 to 2.04. Community differences in plant species composition were reflected in biomass distribution. The total biomass showed a de-crease from 13196.96±719.69 g/m2.in the sedge-dominated K. tibetica swamp to 2.69.58±147.52.g/m2.in the forb and sedge dominated K. pygmaea meadow, and to 2.53.08±141.95 g/m2.in the forbs and grasses dominated K. humilis along with the increase of altitude. The vertical distribution of below-ground biomass is distinct in the three meadow communities, and the belowground biomass at the depth of 0-10 cm in K. tibetica swamp meadow was significantly higher than that in K. humilis and K. pygmaea meadows (P<0.01). The herbaceous litter in K. tibetica swamp was significantly higher than those in K. pygnaeca and K. humilis meadows. The effects of plant litter are enhanced when ground water and soil moisture levels are raised. The relative importance of litter and vegetation may vary with soil water availability. In the K. tibetica swamp, total biomass was negatively correlated to species richness (P<0.05); aboveground biomass was positively correlated to soil organic matter, soil moisture, and plant cover (P<0.05); belowground biomass was positively correlated with soil moisture (P<0.05). However, in the K. py

关键词： plant species richness plant litter aboveground biomass belowground biomass soil moisture alpine meadow

Distributive Behaviours of the Seawater Chemical Resources in the Gulf of Thailand Using Isothermal Evaporation

在线全文

学校读者我要写书评

暂无评论

Distributive Behaviours of the Seawater Chemical Resources i...

第十六届全国化学热力学和热分析学术会议

作者： Ya-Fei Guo~1,Chen-Xiao Lin~1,Zhi-Gang Zhao~1,Xing-Liang Xu~1, Xiao-Gang Cheng~1,Shi-Qiang Wang~1 and Tian-Long Deng~(1,2. 1 Tianjin Key Laboratory of Marine Resources and Chemistry,College of Marine Sci &Eng,Tianjin University of Science and Technology,Tianjin,300457,P.R.china, 2.ACS Key Laboratory of salt Lake Resources and Chemistry,{2. Institute of salt lakes,chinese academy of sciences.xining,810008,P.R.china

＜正＞In order to economically exploit seawater chemical resources,it is essential to adequately adopt the local natural resources such as the energy of the wind and sun,i.e.,solar pond *** simulating isothermal evaporation experiment as similar as the climate conditions in the Gulf of Thailand was designed to demonstrate the enrichment behaviours of sodium,potassium, magnesium,calcium and the rare elements including lithium,bromine,rubidium,and caesium in seawater in the Gulf of Thailand. Through this experimental study,a series of liquid- and solid phase samples through evaporating after filtrating were obtained and analyzed to reveal the enriched behaviours of sodium,potassium, magnesium,*** experiment results showed that potassium ion was gradually enriched in the liquid phase in the first stage,and then it was crystallized out in the forms of carnallite and only a few of potassium chloride formed at the late evaporating stage. Meanwhile,the concentrations of lithium ion and bromine ion are measured corresponding to flame atomic absorption spectrophotometer and spectrophotometer to reveal the enrichment behaviors of lithium and bromine in brine during isothermal evaporating *** results of experiment showed that lithium was enriched constantly at the first stage of evaporating,and then significantly up to 18.85 mg/L of lithium in solution;bromine in the liquid phase was enriched as similar as lithium with the highest concentration up to 6.0g/L in the mother *** thesis provides an important reference for the development process of bromine and lithium extraction from the seawater in the Gulf of Thailand. Those results provided a valuable reference for the comprehensive utilization of seawater in the Gulf of Thailand.

关键词： Simulating Isothermal evaporating Crystallized path Seawater The Gulf of Thailand

柴达木盆地弃耕地成因及其土壤盐渍地球化学特征

在线全文

cnki会议

学校读者我要写书评

暂无评论

土壤学报 2004年第1期41卷 44-49页

作者：王启基王文颖王发刚李晓明杨惠青中国科学院西北高原生物研究所西宁810001 青海师范大学青海畜牧兽医职业学院青海湟源810600 海西州草原站青海德令哈817000

柴达木盆地弃耕地土壤pH值一般都在 8左右 ,属于碱性土壤。土壤含盐量较高 ,其全盐量随着土层深度的增大而减少。 0～ 10cm土层中的含盐量最大 ,一般在 1～ 45gkg- 1之间。弃耕地土壤阳离子主要以K+ 、Na+ 、Mg2.+ 、Ca2.+ 为主 ,各阴... 详细信息

柴达木盆地弃耕地土壤pH值一般都在 8左右 ,属于碱性土壤。土壤含盐量较高 ,其全盐量随着土层深度的增大而减少。 0～ 10cm土层中的含盐量最大 ,一般在 1～ 45gkg- 1之间。弃耕地土壤阳离子主要以K+ 、Na+ 、Mg2.+ 、Ca2.+ 为主 ,各阴离子在三层土体中的含量为Cl- >SO2.-4>HCO-3 >CO2.-3 。经相关分析表明 ,弃耕地土壤全盐量与Cl- 呈极显著的正相关 (p 2.+ 和Ca2.+ (p 2.+ 和Ca2.+ 呈极显著的正相关 (p 2.-3 和SO2.-4呈弱的正相关 ,而与HCO-3 呈负相关 ;从而进一步说明 ,柴达木盆地弃耕地土壤为氯化物盐化土。柴达木盆地弃耕地土壤中有机质含量较少 ,0～ 3 0cm土层中有机质平均含量为 11 46gkg- 1;全氮、全磷的含量极低 ,全钾的含量较为丰富。示范试验结果分析认为。

关键词：柴达木盆地弃耕地成因土壤改良盐渍地球化学特征

Characterizing CO_2.fluxes for growing and non-growing seasons in a shrub ecosystem on the qinghai-Tibet Plateau

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2005年第Z1期48卷 133-140页

作者： XU Shixiao, ZHAO Xinquan, FU Yuling, ZHAO Liang, LI Yingnian, CAO Guangmin, GU Song, WANG Qinxue & DU Mingyuan Northwest Institute of Plateau Biology, chinese academy of {2. xining 810001, china Institute of Geographic {2.and Natural Resources Research, chinese academy of {2. Beijing 100101, china Graduate School of the chinese academy of {2. Beijing 100136, china National Institute for Environmental Studies, Tsukuba 305-8569, Japan National Institute for Agro-Environmental Science, Tsukuba 305-8604, Japan Northwest Institute of Plateau Biology Chinese Academy of Sciences Xining 810001 China Graduate School of the chinese academy of {2. Beijing 100136 China Northwest Institute of Plateau Biology Chinese Academy of Sciences Xining 810001 China Institute of Geographic sciences.and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China National Institute for Environmental Studies Tsukuba 305-8569 Japan National Institute for Agro-Environmental Science Tsukuba 305-8604 Japan

To assess carbon budget for shrub ecosystems on the qinghai-Tibet Plateau, CO2.lux was measured with an open-path eddy covariance system for an alpine shrub ecosystem during growing and non-growing seasons. CO2.flux dynamics was distinct between the two seasons. During the growing season from May to September, the ecosystem exhibited net CO2.ptake from 08:00 to 19:00 (Beijing Standard Time), but net CO2.emission from 19:00 to 08:*** CO2.uptake appeared around 12.00 with values of 0.71, 1.19, 1.46 and 0.67 g CO2.-2.h-1 for June, July, August and September, respectively. Diurnal fluctuation of CO2.flux showed higher correlation with photosynthetic photon flux density than temperature. The maximum net CO2.influx occurred in August with a value of 2.7 g CO2.m-2. The total CO2.uptake by the ecosystem was up to 583 g CO2.m-2.for the growing season. During the non-growing season from January to April and from October to December, CO2.flux showed small fluctuation with the largest net CO2.efflux of 0.30 g CO2.m-2.h-1 in April. The diurnal CO2.flux was close to zero during most time of the day, but showed a small net CO2.efflux from 11:00 to 18:00. Diurnal CO2.flux, is significantly correlated to diurnal temperature in the non-growing season. The maximum monthly net CO2.efflux appeared in April, with a value of 105 g CO2.m-2. The total net CO2.efflux for the whole non-growing season was 356 g CO2.m-2.

关键词： alpine shrub ecosystem, CO2 flux, carbon dynamics, growing season, non-growing season.