检索结果-南通市图书馆

Water Sources of Dominant Species in Three Alpine Ecosystems on the Tibetan Plateau,China

Journal of Integrative Plant Biology 2008年第3期50卷 257-264页

作者： De-Yu Duan hua Ouyang ming-hua song Qi-Wu Hu Institute of Geographical Sciences and Natural Resources Research the Chinese Academy of Sciences Beijing 100101 China Graduate University of the Chinese Academy of Sciences Beijing 100039 China

Plant water sources were estimated by two or three compartment linear mixing models using hydrogen and oxygen isotope （δD and δ^18O） values of different components such as plant xylem water, precipitation and river water as well as soil water on the Tibetan Plateau in the summer of 2005. Four dominant species （Quercus aquifolioides, Pinus tabulaeformis, Salix rehderiana and Nitraria tangutorum） in three typical ecosystems （forest, shrub and desert） were investigated in this study. Stable isotope ratios of the summer precipitations and the soil water presented variations in spatial and temporal scales. δ^18O values of N. tangutorum xylem water were constant in the whole growth season and very similar to those of deep soil water. Water sources for all of the plants came from both precipitations and soil water. Plants switched rapidly among different water sources when environmental water conditions changed. Rainwater had different contributions to the plants, which was influenced by amounts of precipitation. The percentage of plant xylem water derived from rainwater rose with an increase in precipitation. Water sources for broad-leaved and coniferous species were different although they grew in the same environmental conditions. For example, the broad-leaved species Q. aquifolioides used mainly the water from deep soil, while 92.5% of xylem water of the coniferous species P. tabulaeformis was derived from rainwater during the growth season. The study will be helpful for us to fully understand responses of species on the Tibetan Plateau to changes in precipitation patterns, and to assess accurately changes of vegetation distribution in the future.

关键词： δD δ^18O precipitation river water soil water Tibetan Plateau

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 Sequestration in Two Alpine Soils on the Tibetan Plateau

引用

Journal of Integrative Plant Biology 2009年第9期51卷 900-905页

作者： Yu-Qiang Tian Xing-Liang Xu ming-hua song Cai-Ping Zhou Qiong Gao hua Ouyang College of Resources Science & Technology State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Beijing 100875 China Key Laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources Research the Chinese Academy of Sciences Beijing 100101 China

Soil carbon sequestration was estimated in a conifer forest and an alpine meadow on the Tibetan Plateau using a carbon- 14 radioactive label provided by thermonuclear weapon tests （known as bomb-^14C）. Soil organic matter was physically separated into light and heavy fractions. The concentration spike of bomb-^14C occurred at a soil depth of 4 cm in both the forest soil and the alpine meadow soil. Based on the depth of the bomb-^14C spike, the carbon sequestration rate was determined to be 38.5 g C/m^2 per year for the forest soil and 27.1 g C/m^2 per year for the alpine meadow soil. Considering that more than 60% of soil organic carbon （SOC） is stored in the heavy fraction and the large area of alpine forests and meadows on the Tibetan Plateau, these alpine ecosystems might partially contribute to ＂the missing carbon sink＂.

关键词： alpine soils bomb carbon carbon sequestration soil organic carbon.

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

Species-specific phenological responses to long-term nitrogen fertilization in an alpine meadow

引用

Journal of Plant Ecology 2017年第2期10卷 301-309页

作者： Tan-Feng Yin Li-Li Zheng Guang-Min Cao ming-hua song Fei-Hai Yu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesA11Datun RoadChaoyang DistrictBeijing 100101China School of Nature Conservation Beijing Forestry University35 East Qinghua RoadHaidian DistrictBeijing 100083China University of Chinese Academy of Sciences No.19 Yuquan RoadBeijing 100039China Northwest Institute of Plateau Biology Chinese Academy of Sciences59 Xiguan DajieXining 810008China

Aims Long-term nitrogen(N)fertilization has profound impacts on com-munity structure and ecosystem function,but little is known about its effects on plant ***,no published study has examined effects of N chemical forms on plant *** in an alpine meadow on the Tibetan Plateau,we monitored reproductive phenology of six common plant species after 8 years of fertilization with different N chemical forms(addition of 7.5 g N m^(−2) yr^(−1) in the forms of ammonium,nitrate and ammonium nitrate),with no N addition as the *** Findings Eight years of N fertilization affected plant reproductive phenology,and such effects depended on the species,N form and phenological *** with ammonium generally delayed,advanced or did not change flowering and fruiting phases of the alpine ***,fertilization with ammonium affected the temporal dispersion of reproductive phenology among the six species,espe-cially among the late-flowering *** could reduce the overlap of flowering and fruiting and increase phenological *** with nitrate only delayed the senescence phase of Elymus nutans,and fertilization with ammonium nitrate did not affect reproductive phenology of the six alpine plants.N fertilization with any form increased the overlap in senescence among the six *** conclude that long-term N fertilization can cause shifts in plant phenology and such effects depend on N chemical *** results also suggest that phenological comple-mentarity could be a mechanism underlying resource partitioning and thus species coexistence in the face of changing N availability with different chemical forms.

关键词： reproductive phenology fertilization nitrogen forms temporal dispersion in phenology alpine meadow

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Small-scale switch in cover-perimeter relationships of patches indicates shift of dominant species during grassland degradation

引用

Journal of Plant Ecology 2020年第6期13卷 704-712页

作者： ming-hua song Johannes HCCornelissen Yi-Kang Li Xing-Liang Xu hua-Kun Zhou Xiao-Yong Cui Yan-Fen Wang Rong-Yan Xu Qi Feng Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Restoration Ecology of Cold Area in Qinghai Province Northwest Institute of Plateau BiologyChinese Academy of SciencesXining 810008China Systems Ecology Department of Ecological ScienceFaculty of Earth and Life SciencesVU UniversityDe Boelelaan 10851081 HV AmsterdamThe Netherlands College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Plant Science Research Center Shanghai Key Laboratory of Plant Functional Genomics and ResearchPlant Science Research CenterShanghai Chenshan Botanic GardenShanghai 201602China Key Laboratory of Ecohydrology of Inland River Basin Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Aims Grasslands are globally threatened by climate changes and unsustainable land-use,which often cause transitions among alternative stable states,and even catastrophic transition to *** vegetation patch configurations have been shown to signify such transitions at large spatial ***,we demonstrate how small-scale patch configurations can also indicate state *** The whole spatial series of degradation successions were chosen in alpine grasslands characterized as seven typical *** numbers,and perimeter and cover of each patch were recorded using adjacent quadrats along transects in each type of the *** abundance within each patch was *** Findings Across seven grazing-induced degradation stages in the world’s largest expanse of grassland,from dense ungrazed turf to bare black-soil crust,patch numbers and perimeters first increased as patch cover *** and perimeters then decreased rapidly beyond an intersection point at 68%of initial continuous vegetation *** this point,the vegetation fluctuated back and forth between the sedge-dominated grassland breaking-up phase and the forb-dominated phase,suggesting impending shift of grassland *** study thus demonstrates how ground-based small-scale vegetation surveys can provide a quantitative,easy-to-use signals for vegetation degradation,with promise for detecting the catastrophic transition to desertification.

关键词： grassland degradation state transition Tibetan Plateau trade-off vegetation patchiness

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Analysis of causes of pain after kyphoplasty for osteoporotic vertebral compression fractures

引用

Chinese Medical Journal 2013年第11期126卷 2192-2194页

作者： CHEN Xiao-ming MA hua-song WANG Meng YANG Bin YUAN Wei Department of Orthopaedics the People's Liberation Army 306Hospital Beijing 100101 China

For the treatment of osteoporotic vertebral compression fractures （OVCFs）, percutaneous kyphoplasty （PKP）enables rapid pain relief and spinal stabilization, as well as correction of kyphosis. Although serious complications such as pulmonary embolism and spinal cord and nerve damage may occur,1 recurrence of pain after PKP is unlikely to require medical attention. The present study analyzed the causes of post-operative residual pain by reviewing the clinical data of 16 from 121 patients with OVCFs who underwent PKP from August 2005 to April 2009. METHODS

关键词： osteoporosis compression fractures kyphoplasty

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

Antitumor effects of mutant endostatin are enhanced by Bcl-2 antisense oligonucleotides in UM-UC-3 bladder cancer cell line

引用

Chinese Medical Journal 2013年第15期126卷 2834-2839页

作者： REN ming-hua YU Jing-song song Er-lin ZHANG Cheng MA Li JIAO Zhi-xing ZHAO Wei-ming SHAN Yu-juan NI Shao-bin Harbin Med Univ Affiliated Hosp 1 Dept Urinary Surg Harbin 150001 Heilongjiang Peoples R China Chinese Peoples Liberat Army Hosp 211 Dept Urinary Surg Harbin 150080 Heilongjiang Peoples R China Harbin Inst Technol Food Sci & Engn Sch Harbin 150090 Heilongjiang Peoples R China

Background Endostatin is a potent inhibitor of tumor angiogenesis. In the preliminary studies, we developed a mutant endostatin containing Arg-Gly-Asp-Arg-Gly-Asp （RGDRGD） sequences. In this study, we compared the antitumor effects of mutant endostatin and Bcl-2 antisense oligonucleotides both in combination and individually. Methods The artificially synthesized Bcl-2 ASODN （antisense oligonucleotides） included a translation-initiation site and was transfected into the bladder cancer cells by Lipofectamine. Cell growth was investigated by the tumor cell growth chart, MTT assay, caspase-3 activity detection assay, AO/EB fluorescein stain, and the annexin V-FITC apoptosis detection assay. In the in vivo study, UM-UC-3 bladder cancer cells were subcutaneously implanted into nude mice and the growth of tumor was examined. The ultrastructure of the tumor tissues in the treated and control groups were observed. Results The cell growth chart showed that the cell population of the treated combination group decreased by 52.04% compared to the control group. The inhibition rate of the treated combination group was （79.66＋6.79）%, whereas those of the individual ASODN and ES groups were （53.39＋3.22）% and （50.22＋5.46）% respectively. In the caspase-3 activity detection using AO/EB fluorescein stain and annexin V-FITC apoptosis detection assay, the co-inhibitory effect was higher than the individual inhibitory effects （P〈0.05）. There were significant differences in the inhibition of the solid tumor growth in the in vivo study. Conclusions Our findings indicated that Bcl-2 antisense oligonucleotides enhance the antitumor effects of mutant endostatin both in vitro and in vivo. We noted the synergistic effects of Bcl-2 antisense oligonucleotides combined with mutant endostatin.

关键词： endostatin Bcl-2 antisense oligonucleotides Arg-Gly-Asp

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于Atom Z510的车载多媒体播放系统

引用

计算机应用 2011年第9期31卷 2584-2588页

作者：李霞闵华松武汉科技大学计算机科学与技术学院武汉430065

针对现有车载影音系统功能单一、更新不便的缺陷,设计并实现了一款能够同时实现音频和视频播放的高性能车载播放器。系统采用Intel最新推出的嵌入式处理器Atom Z510作核心处理器,在其上定制XPE作操作系统,采用Qt Creator作开发工具,使... 详细信息

针对现有车载影音系统功能单一、更新不便的缺陷,设计并实现了一款能够同时实现音频和视频播放的高性能车载播放器。系统采用Intel最新推出的嵌入式处理器Atom Z510作核心处理器,在其上定制XPE作操作系统,采用Qt Creator作开发工具,使用图形用户接口(GUI)技术,实现了一个带有图形操作界面的播放器。该播放器既能播放本地媒体文件,也能识别CF卡、U盘等移动存储设备,并能对移动设备上存储的媒体文件进行播放。

关键词：车载播放器图形用户接口 Atom510处理器 XPE

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

Solitons for the cubic-quintic nonlinear Schrdinger equation with varying coefficients

引用

Chinese Physics B 2012年第5期21卷 133-139页

作者：陈元明马松华马正义 College of Sciences Lishui University

In this paper,by means of similarity transfomations,we obtain explicit solutions to the cubic-quintic nonlinear Schr顜僤inger equation with varying coefficients,which involve four free functions of *** types of free f... 详细信息

关键词： cubic-quintic nonlinear SchrSdinger equation similarity transformation explicit solu-tions

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

PLC控制器剩余器件用于系统保护中的研究

引用

电气开关 2007年第3期45卷 26-28页

作者：徐锋化明松宋星浙江台州职业技术学院电子电气系浙江台州318000

讨论了PLC剩余资源,通过软件设计提高控制系统的安全可靠性,阐述了安全保护程序设计的基本思路,总结了程序设计的几种方法。

关键词： PLC剩余资源保护程序安全可靠性信号联锁逻辑判断

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

Universal design of three-dimensional porous graphene-iron based promotors for kinetically rationalized lithium-sulfur chemistry

引用

Journal of Energy Chemistry 2025年第1期100卷 192-200页

作者： hua Gao Yunfeng Zhang Menglei Wang Ruoxuan Yang Shuai Feng Xuan Cao Yaping Zhang Zhongyuan Lu Yingze song State Key Laboratory of Environment-Friendly Energy Materials School of Materials and Chemistry Southwest University of Science and Technology School of Material Science and Engineering Henan University of Technology College of Chemistry and Chemical Engineering Taishan University

Lithium-sulfur （Li-S） batteries are widely deemed to be one of the most potential candidates for future secondary batteries because of their remarkable energy ***,notorious polysulfide shuttling and retarded sulfur reaction kinetics pose significant obstacles to the further application of Li-S *** rationally designed highly active electrocatalysts can facilitate polysulfide conversion,the universal and scalable synthesis strategies need to be ***,a universal synthetic strategy to construct a series of three-dimensional （3D） porous graphene-iron （3DGr-Fe） based electrocatalysts involving 3DGr-FeP,3DGr-Fe3C,and 3DGr-Fe3Se4is exploited for manipulating the Li-S redox *** has been observed that the implementation of a 3D porous Gr architecture leads to the well-designed conductive networks,while the uniformly dispersed iron nanoparticles introduce an abundance of active sites,fostering the lithium polysulfide conversion,thereby bolstering the overall electrochemical *** Li-S battery with the 3DGr-Fe based electrocatalyst exhibits remarkable capacity retention of 94.8%upon 100 times at 0.2 ***,the soft-packaged Li-S pouch cell based on such a 3DGr-Fe electrocatalyst delivers superior capacity of 1060.71 mA h g-1and guarantees for the continuous 30 min work of fan *** investigation gives comprehensive insights into the design,synthesis,and mechanism of 3DGr-Fe based electrocatalysts with high activity toward efficient and durable Li-S batteries.

关键词： Lithium-sulfur battery Universal synthesis 3D graphene-iron based promotor Electrocatalysis

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

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：