检索结果-南通市图书馆

Indian monsoon influences altitude effect of δ^(18)O in precipitation/river water on the Tibetan Plateau

chinese science Bulletin 2009年第15期54卷 2724-2731页

作者： YAO TanDong1,2. ZHOU Hang1,3 & YANG XiaoXin1,3 1 Key Laboratory of Tibetan Environment Changes and Land Surface Processes, institute of Tibetan Plateau research,{2.s, Beijing 100085, China 2.State Key Laboratory of Cryosphere sciences, cold and arid regions environmental and engineering research institute,{2.s,{12., China 3 Graduate University of{2.s, Beijing 100049, China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China State Key Laboratory of Cryosphere sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou China Graduate University of chinese academy of sciences Beijing China

The δ 18O variation in precipitation acquired from 2. stations within the network of Tibetan Observation and research Platform(TORP)is studied, with the focus on the altitude effect of δ 18O in river water during monsoon precipitation in an effort to understand the monsoon influence on isotopic composition in annual river water. It is found that δ 18O in precipitation on the Plateau is influenced by different moisture sources, with significant Indian monsoon influence on δ 18O composition in plateau precipitation and river water. The δ 18O of water bodies in the monsoon domain is generally more depleted than that in the westerly domain, suggesting gradual rainout of southwesterly borne marine moisture in the course of long-distance transportation and lifting over the Himalayas. The lapse rate of δ 18O in river water with altitude is the largest during monsoon precipitation, due to the increased temperature vertical gradient over the southern Plateau region controlled by monsoon circulation. The combination of δ 18O in river water in monsoon (wet) and non-monsoon (dry) seasons shows a larger lapse rate than that in non-monsoon (dry) season alone. As the altitude effect of δ 18O in precipitation and river water on the Tibetan Plateau results from the combined effect of monsoon moisture supply and westerly moisture supply, the δ 18O composition and its altitude effect on the Plateau during monsoon seasons should be considered in the reconstruction of paleoelevation of the Tibetan Plateau.

关键词：印度季风青藏高原降水

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Carbon assimilation characteristics of plants in oasis-desert ecotone and their response to CO2.enrichment

引用

science China Earth sciences 2004年第S1期 39-49页

作者： SU Peixi, CHEN Huaishun, AN Lizhe & LIU Xinmincold and arid {2. environmental and engineering research institute, chinese academy of sciences, lanzhou 730000, China

Six species of more than 2.-year-old desert woody plants in the oasis-desert ecotone were selected for study. The results showed that: (1) in different growing seasons δ13C values of assimilating organ varied between -14‰ and -16‰ for Haloxylon ammodendron (HA),-14‰-15‰ for Calligonum mongolicum (CM) and-2.‰- -2.‰ for Caragana korshinskii(CK), Nitraria sphaerocarpa (NS) and Hedysarum scoparium (HS). (2. The net photosynthetic rate (Pn) of HA and CM was significantly higher than those of the other species. With the decrease in Pn for the six species, their intercellular CO2.concentration increased, but stomatal limitation value decreased under the intensive light. At the same time, the photochemical efficiency of PS II dropped to different degrees. (3) The CO2.enrichment experiment demonstrated that, Pn of HA and CM increased to different extent under 450 umol/mol, but their Pn reduced or approximated to the current condition under 650 umol/mol. Under 450 umol/mol the efficiency for solar energy u

关键词： oasis-desert ecotone carbon assimilation stable carbon isotope ratio photoinhibition CO2.enrichment.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Distribution of Borehole Temperature at Four High-altitude Alpine Glaciers in Central Asia

引用

Journal of Mountain science 2009年第3期6卷 221-227页

作者： LIU Yaping HOU Shugui WANG Yetang SONG Linlin State Key Laboratory of Cryospheric sciences Cold andArid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences China Graduate University of chinese academy of sciences Beijing 100049 China

The distribution of borehole temperature at four high-altitude alpine glaciers was investigated. The result shows that the temperature ranges from -13.4℃ to -1.84℃, indicating the glaciers are cold throughout the boreholes. The negative gradient （i.e., the temperature decreasing with the increasing of depth） due to the advection of ice and climate warming, and the negative gradient moving downwards relates to climate warming, are probably responsible for the observed minimum temperature moving to lower depth in boreholes of the Gyabrag glacier and Miaoergou glacier compared to the previously investigated continental ice core borehole temperature in West China. The borehole temperature at 10m depth ranges from -8.0℃ in the Gyabrag glacier in the central Himalayas to -12.9℃ in the Tsabagarav glacier in the Altai range. The borehole temperature at 10 m depth is 3-4 degrees higher than the calculated mean annual air temperature on the surface of the glaciers and the higher 10 m depth temperature is mainly caused by the production of latent heat due to melt-water percolation and refreezing. The basal temperature is far below the melting point, indicating that the glaciers are frozen to bedrock. The very low temperature gradients near the bedrock suggest that the influence of geothermal flux and ice flow on basal temperature is very weak. The low temperature and small velocity of ice flow of glaciers are beneficial for preservation of the chemical and isotopic information in ice cores.

关键词： Borehole temperature Glacier CentralAsia Climate warming

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Glacier Area Changes in the Qangtang Plateau Based on the Multi-temporal Grid Method and its Sensitivity to Climate Change

引用

Journal of Mountain science 2011年第6期8卷 882-893页

作者： WANG Liping XIE Zichu WANG Xin LIU Shiyin DING Liangfu SHANGGUAN Donghui The College of Resources and environmental science Hunan Normal University Changsha China cold and arid {2. environmental and engineering research institute Chinese Academy of Sciences Lanzhou China Department of Geography Hunan University of Science and Technology Xiangtan China

Glacier area changes in the Qangtang Plateau are analyzed during 1970-2.00 using air photos,relevant photogrammetric maps and satellite images based on the multi-temporal grid *** results indicate that the melting of glaciers accelerated,only a few of glaciers in an advancing state during 1970-2.00 in the whole Qangtang ***,the glaciers seemed still more stable in the study area than in most areas of western *** estimate that glacier retreat was likely due to air temperature warming during 1970-2.00 in the Qangtang ***,the functional model of glacier system is applied to study climate sensitivity of glacier area changes,which indicates that glacier lifespan mainly depends on the heating rate,secondly the precipitation,and precipitation increasing can slow down glacier retreat and make glacier lifespan prolonged.

关键词： The Qangtang Plateau Glacier change Multi-temporal Climate change Functional model ofglacier system Simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Leguminous Shrub (Caragana microphylla) in Semiarid Sandy Soils of North China

引用

Pedosphere 2006年第3期16卷 319-325页

作者： ZHANG Tong-Hui SU Yong-Zhong CUI Jian-Yuan ZHANG Zhi-Hui CHANG Xue-Xiang cold and arid {2. environmental and engineering research institute Chinese Academy of Sciences Lanzhou 730000 （China）

Caragana microphylla Lam., a pioneer leguminous shrub species for vegetation re-establishment, is widely distributed in the semi-fixed and fixed sandy lands of the Horqin region. Some soil chemical and physical properties were measured under the canopy of C. microphylla and in the adjacent open areas to determine the effects of individual shrubs on soil properties. The influence of isolated C. microphylla on chemical and physical properties of the topsoil was significantly different between plots under the shrub canopy and in the shrub interspaces. Beneath the shrub canopy greater amounts of fine particle fractions, a higher water-holding capacity, and a lower bulk density, as well as higher aboveground and belowground litter biomass were found. Soil organic C and total N concentrations were 2.%-31.6% and 14%-2..2. higher under the shrub canopies than in the shrub interspaces, respectively, giving rise to 'islands of fertility'. In a desertified sandy grassland ecosystem, C. microphylla was believed to play a major role in organic C sequestration, N accumulation, and the hydrologic cycle. Additionally, it has been found to be of ecological importance for vegetative restoration and reversal of desertification.

关键词： Caragana microphylla Lam. degraded sandy grassland soil chemical properties soil physical properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

THE ECOLOGICAL SERVICE FUNCTION OF CHINA'S DESERT ECOSYSTEMS

THE ECOLOGICAL SERVICE FUNCTION OF CHINA'S DESERT ECOSYSTEMS

引用

第三世界生态高峰会

作者： Yang Liwen Shapotou Desert research &Experiment Station,cold and {2. regions environmental and engineering research institute,chinese academy of sciences.lanzhou {12.,China

arid land covers 41 percent of the earth,and desert is the main component of the arid *** desert ecosystem is the result of interactions between biology and environment under arid *** as the forest,marsh,cropland,grassland and ocean ecosystems,the desert ecosystem is an important part of the natural ecosystems and it plays a vital role in maintaining the earth ecological health and safety. However,we knew little about it,especially the knowledge of ecological service value and function in comparison with the other *** situation limits not only the correct evaluation of the earth ecosystem,but also restricts the social and economic development of the desert *** addition,it delays the integrative process of the *** is the biggest developing country in the world,and her desert ecosystems are disturbed frequently and severely by the people's *** desert ecosystems' healthy and sustainable development significantly influences China's development and *** this paper,we analyzed the distribution patterns of the unique bio-diversity resources and then discussed the functioning mechanisms of the desert ecosystems in ***,the paper explored the relations of the desert ecosystem's service function with a series of ecological and environmental problems such as desertification,global climate changes and social and economic *** author thinks that the desert ecosystem plays a critical role in maintaining the balance of the earth carbon cycle and reversing the process of desertifieation development and therefore should pay much attention to protect the desert ecosystem in China.

关键词： THE ECOLOGICAL SERVICE FUNCTION OF CHINA'S DESERT ECOSYSTEMS

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

敦煌地区大气气溶胶的辐射效应

引用

太阳能学报 2004年第3期25卷 320-324页

作者：李韧季国良中国科学院寒区旱区环境与工程研究所兰州730000

利用敦煌地区1981～1983年地面实测的太阳直接辐射资料计算了该地区大气气溶胶的透射比及气溶胶对辐射削弱量,通过分析大气气溶胶的透射比与直接辐射、散射副射、S′/Q、D/Q的关系以及气溶胶对辐射削弱量与气温、直接辐射、气熔胶透射... 详细信息

利用敦煌地区1981～1983年地面实测的太阳直接辐射资料计算了该地区大气气溶胶的透射比及气溶胶对辐射削弱量,通过分析大气气溶胶的透射比与直接辐射、散射副射、S′/Q、D/Q的关系以及气溶胶对辐射削弱量与气温、直接辐射、气熔胶透射比的关系,讨论了大气气熔胶的辐射效应,得出了一些初步结论,随着气溶胶透射比的增大直接辐射、Q、S′/Q增大,D/Q减少;气溶胶对辐射的削弱增大时,气温减小,垂直于太阳光束面上的直接辐射减小,气溶胶透射比减小;在干旱地区晴空气溶胶对辐射的削弱占主导地位。

关键词：气溶胶辐射效应

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hydrological Characteristics of the Rongbuk Glacier Catchment in *** Region in the Central Himalayas,China

引用

Journal of Mountain science 2010年第2期7卷 146-156页

作者： LIU Weigang REN Jiawen QIN Xiang LIU Jingshi LIU Qiang CUI Xiaoqing WANG Yetang State Key Laboratory of Cryospheric sciences Cold andArid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China institute of Tibetan Plateau research Chinese Academy of Sciences Beijing 10085 China

From 8 April to 11 October in 2.05, hydrological observation of the Rongbuk Glacier catchment was carried out in the Mr. Qomolangma （Everest） region in the central Himalayas, China. The results demonstrated that due to its large area with glacier lakes at the tongue of the Rongbuk Glacier, a large amount of stream flow was found at night, which indicates the strong storage characteristic of the Rongbuk Glacier catchment. There was a time lag ranging from 8 to 14 hours between daily discharge peaks and maximum melting （maximum temperature）. As melting went on the time lag got shorter. A high correlation was found between the hydrological process and daily temperature during the ablation period. The runoff from April to October was about 80% of the total in the observation period. Compared with the discharge data in 1959, the runoff in 2.05 was much more, and the runoff in June, July and August increased by 69%, 35% and 14%, respectively. The rising of temperature is a major factor causing the increase in runoff. The discharges from precipitation and snow and ice melting are separated. The discharge induced by precipitation accounts for about 2.% of the total runoff, while snow and ice melting for about 80%.

关键词： Central Himalayas Mt. Qomolangma Rongbuk Glacier Hydrological characteristics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The ecohydrology of the soil-vegetation system restoration in arid zones: a review

引用

research in cold and {2. regions 2009年第3期1卷 199-206页

作者： XinRong Li 1,2. ZhiShan Zhang 1,2. Lei Huang 1,2. LiChao Liu 1,2. XinPing Wang 1,2.1. Shapotou Desert research and Experiment Station, cold and {2. regions environmental and engineering research institute, chinese academy of sciences, lanzhou, Gansu 730000, China. 2. Laboratory of Stress Ecophysiology and Biotechnology, cold and {2. regions environmental and engineering research In-stitute, chinese academy of sciences, lanzhou, Gansu 730000, China. chinese Acad Sci Cold & Arid Reg Environm & Engn Res Inst Shapotou Desert Res & Expt Stn Lanzhou 730000 Gansu Peoples R China chinese Acad Sci Cold & Arid Reg Environm & Engn Res Inst Lab Stress Ecophysiol & Biotechnol Lanzhou 730000 Gansu Peoples R China

arid zones, which cover approximately 40 percent of the earth’s land surface, support complicated and widely varied ecological systems. As such, arid zones are an important composition of the global terrestrial ecosystem, and water is the key and abiotic lim-ited factor in ecosystem-driven processes in these areas. Ecohydrology is a new cross discipline that provides, in an objective and comprehensive manner, novel ideas and approaches to the evaluation of the interaction and feedback mechanisms involved in the soil–vegetation systems in arid zones. In addition, ecohydrology provides a theoretical basis of ecological restoration that is cen-tered on vegetation construction. In this paper, long-term monitoring and local observations in the transitional belt between a de-sertified steppe and a steppified desert at the Shapotou Desert research and Experiment Station, Tengger Desert, in northern China, were evaluated. The primary achievements and related research progress regarding ecohydrology in arid zones were analyzed and summarized, as a keystone, and the response of soil ecohydrological processes to the changes in the species composition, structure, and function of sandland vegetation was discussed. Meanwhile, the long-term ecological effects and mechanism of regulation of vegetation on soil habitat and on water-cycling were considered. As a vital participant in the ecohydrological processes of soil–vegetation systems, the studies on biological soil crusts was also summarized, and related theoretical models of restoration based on the water balance was reviewed.

关键词： vegetation regulation by soil moisture ecohydrology process biological soil crust ecological restoration of soil–vegetation systems

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

我国西部地区耕地退化现状及其防治对策

引用

水土保持学报 2002年第A1期16卷 1-5,10页

作者：李福兴中国科学院寒区旱区环境与工程研究所甘肃兰州730000

从论述耕地在我国西部经济和社会发展中的战略地位和作用入手 ,根据翔实的资料分析了西部地区耕地退化的现状 ,包括耕地水土流失、沙化、土壤盐碱化、土壤养分亏缺和土壤性质恶化、土壤污染、耕地的非农业占用与损毁等诸多方面 ,探讨了... 详细信息

从论述耕地在我国西部经济和社会发展中的战略地位和作用入手 ,根据翔实的资料分析了西部地区耕地退化的现状 ,包括耕地水土流失、沙化、土壤盐碱化、土壤养分亏缺和土壤性质恶化、土壤污染、耕地的非农业占用与损毁等诸多方面 ,探讨了耕地退化的发展趋势 ,并讨论了耕地退化对西部地区经济和社会可持续发展的影响。

关键词：耕地退化防治对策西部地区

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：