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Seasonal variations and mechanism for environmental control of NEE of CO_2.concerning the Potentilla fruticosa in alpine shrub meadow of qinghai-Tibet Plateau

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Science china Earth sciences 2006年第S2期49卷 174-185页

作者： LI Yingnian, SUN Xiaomin, ZHAO Xinquan, ZHAO Liang, XU Shixiao, GU Song, ZHANG Fawei & YU Guirui 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 University of chinese academy of {2. Beijing 100049, china 1. Northwest Institute of Plateau Biology Chinese Academy of Sciences Xining 810001 China 2. Institute of Geographic sciences.and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China 3. Graduate University of chinese academy of {2. Beijing 100049 China

The study by the eddy covariance technique in the alpine shrub meadow of the Qing-hai-Tibet Plateau in 2.03 and 2.04 showed that the net ecosystem carbon dioxide exchange (NEE) exhibited noticeable diurnal and annual variations, with more distinct daily changes during the warmer seasons. The CO2.emission of the shrub ecosystem culminated in April and September while the CO2.absorption capacity reached a maximum in July and August. The absorbed carbon dioxide during the two consecutive years was 23..4 and 2.4.8 g CO2.m-2.respectively, yielding an average of 2.3.1 gCO2.m-2.per year: that accounts for a large proportion of absorbed CO2.in the region. Obviously, the diurnal carbon flux was negatively related to temperature, radiation and other atmospheric factors. Still, minute discrepancies in kurtosis and duration of carbon emission/absorption were detected between 2.03 and 2.04. It was found that the CO2.flux in the daytime was similarly affected by photosynthetic photon flux density in both years. Temperature appears to be the most important determinant of CO2.flux: specifically, the high temperature during the plant growing season inhibits the carbon absorption capacity. One potential explanation is that soil respiration is enhanced under such condition. Analysis of biomass revealed that the annual net carbon fixed capacity of aboveground and belowground biomass was 544.0 in 2.03 and 559.4 g Cm"2.in 2.04, which coincided with the NEE absorption capacity (63.1 g C·m-2.in 2.03 and 74.9 g C·m-2.in 2.04) in the corresponding plant growing season.

关键词： Potentilla frutlcosa shrub meadow yearly meteorological conditions CO2.exchange variations meteorological factors aboveground and belowground biomass LAI.

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Effects of Global Warming on the Production Patterns of Agriculture and Animal Husbandry in qinghai

Effects of Global Warming on the Production Patterns of Agri...

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作者： Li Yingnian,Shen Zhenxi,Chen Bo,Wang Wenying and Jiang WenboNorthwest Plateau Institute of Biology,chinese academy of {2.xining 810008,P.R. china

The production patterns of agriculture and animal husbandry in different areas underpresent conditions were analyzed in this paper.A regression equation was established based on thedemarcation temperature and its duration(days) and the present environmental condition in *** correlatiqn is distinctive among the distributive patterns of agricultural and animalhusbandry production,local heat quantity and duration(days) of differnt *** the equation,the possible change of the production pattrns of agriculture,animal husbandryand forestry in qinghai was estimated under future climatic ***,future thermalresources of qinghai were also *** results showed that the accumulative temperaturesof demarcation temperature would be increased by about 380℃d. The days of duration will alsobe increased by 2. days under the condition of air temperature raising by 2. and precipitationincreasing by 10%.It will lead to expansion of qinghai plantation area(especially economicalcrops in forest-line) and in the level of *** in different areas will become moreseriously because of the increase of the evaporahon of soil surface.

关键词： global warming,production pattern,demarcation temperature,accumulative temperature

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Discovery of C4 species at high altitude in qinghai-Tibetan Plateau

Discovery of C4 species at high altitude in Qinghai-Tibetan ...

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中国科学院地质与地球物理研究所2.04学术年会

作者： WANG Luo~1,L Houyuan~1,WU Naiqin~1,CHU Duo~2. HAN Jiamao~1,WU Yuhu~3,WU Haibin~4 & GU Zhaoyan~1 1.Institute of Geology and Geophysics,chinese academy of {2. Beijing 10002.,china 2.Tibet Institute of Plateau Atmospheric and Environmental {2. Lhasa 850000.china: 3.Northwest Institute of Plateau Biology.chinese academy of {2. xining 810000,china 4.Institute of Earth Environment.chinese academy of {2.Xi’an 710075.china

Plant specimens are collected from the areas between latitude 2.°42.N and 40°57′N,and longitude 88°93′E and 103°2.′E,with an altitudinal range from 2.10 to 5050 m above the sea level in qinghai-Tibetan *** stable carbon isotope analysis indicates that two of Chenopodiaceae and six of Poaceae in the samples are C *** of the C plants are found in 11 spots with altitudes above 3800 m, and Pennisetum centrasiaticum,Arundinella yunnanensis and Orinus thoroldii are present in six spots above 4000 m,even up to 452. *** low CO.,partial pressure,that sufficient energy of high light improving C plant’s tolerance of low temperature and precipitations concentrating in growing season probably are favorable for C4 plants growing at high altitude in qinghai-Tibetan Plateau.

关键词： qinghai-Tibetan Plateau high altitude C4 plants

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Determination for the Binary System of Stearic Acid and Palmitic Acid by Differential Scanning Calorimetry

Determination for the Binary System of Stearic Acid and Palm...

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第十六届全国化学热力学和热分析学术会议

作者： Yu-Ting Li~1,Ya-Fei Guo~1,Shi-Qiang Wang~1 and 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,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＞As a powerful thermal analysis method,differential scanning calorimetry（DSC） has been widely used for the determination of varieties thermodynamics and kinetics parameters,such as specific heat, reaction heat,phase diagram, crystallization rate and so *** to the advantages of instrument durability and affordable price at vary wide temperature ranges,many studies focused on to draw the multi-component phase diagram using DSC.

关键词： Differential scanning calorimetry(DSC) stearic acid palmitic acid phase diagram

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反相高效液相色谱法测定野生与栽培花锚药材及其制剂中的花锚甙和去甲氧基花锚甙

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色谱 2004年第1期22卷 38-40页

作者：纪兰菊丁晨旭陈桂琛代冬海杨艳蓉中国科学院西北高原生物研究所青海西宁810001 青海普兰特藏药研究所青海西宁810007

建立了花锚药材及其制剂中两种抗肝炎有效成分花锚甙和去甲氧基花锚甙的反相高效液相色谱测定方法。采用甲醇回流提取进行样品处理,在乙腈磷酸水溶液为流动相作梯度洗脱、ODS柱、检测波长为2.4nm条件下,花锚甙和去甲氧基花锚甙均可达... 详细信息

建立了花锚药材及其制剂中两种抗肝炎有效成分花锚甙和去甲氧基花锚甙的反相高效液相色谱测定方法。采用甲醇回流提取进行样品处理,在乙腈磷酸水溶液为流动相作梯度洗脱、ODS柱、检测波长为2.4nm条件下,花锚甙和去甲氧基花锚甙均可达到基线分离。两种成分在0 68～3 40g/L,0 36～1 8g/L时,其峰面积与浓度成良好的线性关系,加标回收率为95%～105%。该法适用于花锚药材及其制剂的质量分析检验。

关键词：花锚花锚制剂花锚甙去甲氧基花锚甙含量测定反相高效液相色谱法肝胆系统疾病治疗药物

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Effects of Global Warming on the Production Patterns of Agriculture and Animal Husbandry in qinghai

Effects of Global Warming on the Production Patterns of Agri...

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作者： Li Yingnian, Shen Zhenxi, Chen Bo, Wang Wenying and Jiang Wenbo Northwest Plateau Institute of Biology, chinese academy of sciences. xining 810008, P.R. china

＜正＞The production patterns of agriculture and animal husbandry in different areas under present conditions were analyzed in this paper. A regression equation was established based on the demarcation temperature and its duration （days） and the present environmental condition in every area. The correlation is distinctive among the distributive patterns of agricultural and animal husbandry production, local heat quantity and duration （days） of different temperatures. According to the equation, the possible change of the production patterns of agriculture, animal husbandry and forestry in qinghai was estimated under future climatic changes. Meanwhile, future thermal resources of qinghai were also analyzed. The results showed that the accumulative temperatures of demarcation temperature would be increased by about 380℃-d. The days of duration will also be increased by 2. days under the condition of air temperature raising by 2.and precipitation increasing by 10%. It will lead to expansion of qinghai plantation area （especially economical crops in forest-line） and in the level of latitude. Drought in different areas will become more seriously because of the increase of the evaporation of soil surface.

关键词： global wanning production pattern demarcation temperature accumulative temperature

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

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

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

＜正＞In this paper we analyzed geographical location, climatic condition, grassland resource, eco-environment and trend of development in qinghai-Xizang area. The results suggested that there are irrational ecological structure on grassland, backward management and administrative level, overgrazing, rodent pest, serious soil erosion and artificial disturbance. All these are the main reasons for grassland degradation and deterioration of eco-environment that hinder sustainable development of animal husbandry of grassland. According to the above-mentioned problems, the following strategies should be adopted: utilizing natural grassland rationally, making optimum productive structure of grassland, improving breeds of sheep, carrying out seasonal production of animal husbandry, setting up artificial grassland with stable and high yield, supervising and determining grassland resource and carrying out demonstration research of sustainable development. All these are effective channels to prevent grassland from being degenerated and to prompte economic benefit of animal husbandry.

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

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METASTABLE PHASE EQUILIBRIA OF THE QUINARY SYSTEM(Li+,Na+,Mg2.//Cl-,SO42.-H2.) AT 2.3.15 K

METASTABLE PHASE EQUILIBRIA OF THE QUINARY SYSTEM(Li+,Na+,Mg...

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第15届溶解度现象及相关相平衡过程国际会议

作者： Wang 1 S.Q. Guo 1 Y.F. Gao 1 D.L.and Deng 1 2.T.L.1 Tianjin Key Laboratory of Marine Resources and Chemistry College of Marine Science and Engineering Tianjin University of Science and Technology Tianjin 300457 P.R.china2.ACS Key Laboratory of salt Lake Resources and Chemistry {2. Institute of salt lakes chinese academy of sciences.xining 810008 P.R.china

＜正＞The metastable phase equilibria of the quinary system （Li+, Na+, Mg2.//Cl-, SO42. H2.）were studied at 2.3.15 K by the isothermal evaporation method. The solubilities and the physicochemical properties （densit...

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Application of DSC in the Fields of Phase Chemistry

Application of DSC in the Fields of Phase Chemistry

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第十六届全国化学热力学和热分析学术会议

作者： Xue-Lu Li~1,Ya-Fei Guo~1,Shi-Qiang Wang~1 and 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

Differential scanning calorimetry(DSC) is a technology to measure the variation of energy difference between test sample and reference materials with temperature *** the programmed temperature control,it can record th... 详细信息

关键词： DSC phase chemistry phase diagram eutectic system

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Determination of the Phase Diagram of Disodium Hydrogen Phosphate and Sodium Sulphate System by DSC

Determination of the Phase Diagram of Disodium Hydrogen Phos...

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第十六届全国化学热力学和热分析学术会议

作者： Yan-Rong Tang~1,Ya-Fei Guo~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,PRC, 2.ACS Key Laboratory of salt Lake Resources and Chemistry,qinghai Institute of salt lakes,chinese academy of sciences.xining,810008,PRC

＜正＞Thermal analysis technique is a powerful tool for the study of various disciplines in thermodynamics and ***-flux differential scanning calorimetry（hf-DSC） commenced in the mid-sixties by introducing a thermally inert substance（reference material） and measuring the heat flux difference between the sample and the reference material in the heating-curve method,which gradually gained acceptance in the fields of minerals,metals,ceramics,electronics materials,polymers,organic substances,inorganic substances, pharmaceuticals,food stuff and biological *** phase chemistry,the phase diagram should be drawn at first when researching the phase morphology of binary or multicomponent ***,the quantitative analysis of DSC heat flow rate measurement is one of the useful methods for phase diagram investigations in some complex systems.

关键词： DSC phase equilibria Disodium hydrogen phosphate Sodium sulfate decahydrate

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