维普中文期刊产品整合服务
469篇 您的检索式:作者名="Liu EL"
    题名 作者 年代 出处 被引量
1Monitoring the impact of climate change and human activities on grassland vegetation dynamics in the northeastern Qinghai-Tibet Plateau of China during 2000–2015显示文摘Climate change and human activities can influence vegetation net primary productivity(NPP), a key component of natural ecosystems. The Qinghai-Tibet Plateau of China, in spite of its significant natural and cultural values, is one of the most susceptible regions to climate change and human disturbances in the world. To assess the impact of climate change and human activities on vegetation dynamics in the grassland ecosystems of the northeastern Qinghai-Tibet Plateau, we applied a time-series trend analysis to normalized difference vegetation index(NDVI) datasets from 2000 to 2015 and compared these spatiotemporal variations with trends in climatic variables over the same time period. The constrained ordination approach(redundancy analysis) was used to determine which climatic variables or human-related factors mostly influenced the variation of NDVI. Furthermore, in order to determine whether current conservation measures and programs are effective in ecological protection and reconstruction, we divided the northeastern Qinghai-Tibet Plateau into two parts: the Three-River Headwater conservation area(TRH zone) in the south and the non-conservation area(NTRH zone) in the north. The results indicated an overall(73.32%) increasing trend of vegetation NPP in grasslands throughout the study area. During the period 2000–2015, NDVI in the TRH and NTRH zones increased at the rates of 0.0015/a and 0.0020/a, respectively. Specifically, precipitation accounted for 9.2% of the total variation in NDVI, while temperature accounted for 13.4%. In addition, variation in vegetation NPP of grasslands responded not only to long-and short-term changes in climate, as conceptualized in non-equilibrium theory, but also to the impact of human activities and their associated perturbations. The redundancy analysis successfully separated the relative contributions of climate change and human activities, of which village population and agricultural gross domestic product were the two most important contributors to the NDVI changes, explaining 17.8% and 17.1% of the total variation of NDVI(with the total contribution >30.0%), respectively. The total contribution percentages of climate change and human activities to the NDVI variation were 27.5% and 34.9%, respectively, in the northeastern Qinghai-Tibet Plateau. Finally, our study shows that the grassland restoration in the study area was enhanced by protection measures and programs in the TRH zone, which explained 7.6% of the total variation in NDVI.XIONG Qinli XIAO Yang Marwa Waseem A HALMY Mohammed A DAKHIL LIANG Pinghan LIU Chenggang ZHANG Lin Bikram PANDEY PAN Kaiwen Sameh B EL KAFRAWAY CHEN Jun 2019Journal of Arid Land2019,11,5:10
2Assessing and regulating the impacts of climate change on water resources in the Heihe watershed on the Loess Plateau of China显示文摘Climate change can cause considerable changes in water resources and assessing the potential impacts can provide important information for regional sustainable development. The objectives were to evaluate the possible impacts of climate change during 2010-2039 on water resources (runoff, soil water content, and evapotranspiration) in the Heihe watershed on the Loess Plateau of China and to further explore adaptive measures to cope with the changes. Projections of four climate models (CCSR/NIES, CGCM2, CSIRO-Mk2, and HadCM3) under three emission scenarios (A2, B2, and GGa) were used to estimate future changes in precipitation, maximum and minimum temperature based on Change Factor method. The Soil and Water Assessment Tool (SWAT) was employed to simulate the hydrologic responses to climate changes. The CA-Markov model was used to develop land use scenarios. Compared with the present climate, the climate models predicted a -2.3% to 7.8% change in annual precipitation, 0.7 to 2.2°C rises in maximum temperature, and 1.2 to 2.8°C rises in minimum temperature. Without consideration of land use change, SWAT predicted a -19.8% to 37.0% change for runoff, -5.5% to 17.2% change for soil water content, and 0.1% to 5.9% increase for evapotranspiration during 2010–2039 under all climate scenarios. Though the change of hydrometeorolocial variables are complex, they would possibly increase with great probability, and the hydrological regime would be influenced such as a decrease in runoff in winter months. With land use changes, the projected land use of 2015 would increase soil water content by 4.0% and surface runoff by 5.7% while slightly decrease evapotranspiration by 0.6% compared with the 2000 land use. This result showed that adjustment of land use patterns was capable of regulating water resources and could be used to mitigate the adverse effects of climate change.LI Zhi1,2, LIU WenZhao2, ZHANG XunChang3 & ZHENG FenLi2 1 College of Resources and Environment, Northwest Agriculture & Forestry University, Yangling 712100, China 2 Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling 712100, China 3 USDA-ARS Grazinglands Research Laboratory, 73036, El Reno, Oklahoma, USA 2010Science China Earth Sciences2010,53,5:9
3Notch signaling:Its essential roles in bone and craniofacial development显示文摘Notch is a cellecell signaling pathway that is involved in a host of activities including development,oncogenesis,skeletal homeostasis,and much more.More specifically,recent research has demonstrated the importance of Notch signaling in osteogenic differentiation,bone healing,and in the development of the skeleton.The craniofacial skeleton is complex and understanding its development has remained an important focus in biology.In this review we briefly summarize what recent research has revealed about Notch signaling and the current understanding of how the skeleton,skull,and face develop.We then discuss the crucial role that Notch plays in both craniofacial development and the skeletal system,and what importance it may play in the future.Mikhail Pakvasa Pranav Haravu Michael Boachie-Mensah Alonzo Jones Elam Coalson Junyi Liao Zongyue Zeng Di Wu Kevin Qin Xiaoxing Wu Huaxiu Luo Jing Zhang Meng Zhang Fang He Yukun Mao Yongtao Zhang Changchun Niu Meng Wu Xia Zhao Hao Wang Linjuan Huang Deyao Shi Qing Liu Na Ni Kai Fu Michael J.Lee Jennifer Moriatis Wolf Aravind Athiviraham Sherwin S.Ho Tong-Chuan He Kelly Hynes Jason Strelzow Mostafa El Dafrawy Russell R.Reid 2021Genes & Diseases2021,8,1:4
4Electroplating of mild steel by aluminium in a first generation ionic liquid: A green alternative to commercial Al-plating in organic solvents显示文摘Q.X. Liu S. Zein El Abedin F. Endres 2006Surface & Coatings Technology2006,,3:3
5Genetic variation in the PNPLA3 gene and hepatocellular carcinoma in USA: Risk and prognosis prediction显示文摘Manal M. Hassan Ahmed Kaseb Carol J. Etzel Hashem El‐Serag Margaret R. Spitz Ping Chang Katherine S. Hale Mei Liu Asif Rashid Mohamed Shama James L. Abbruzzese Evelyne M. Loyer Harmeet Kaur Hesham M. Hassabo Jean‐Nicolas Vauthey Curtis J. Wray Basmah S. H 2013Mol Carcinog2013,,1:2
6Zones of approach for craniofacial Resection:minimizing facial incisions for resection of anterior cranial base and paranasal tumors显示文摘Liu JK Decker D Schaefer SD el al 2003Neurosurgery2003,53,5:1
7Fusion cross-sections for inertial fusion energy 显示文摘Li X Z Liu B Chen S el at 2004Laser and Particle Beam2004,22,:1
8Metabolic engineering of biomass for high energy density: oilseed-like triacylglycerol yields from plant leaves 显示文摘Vanhercke T El Tahchy A Liu Q 2014Plant Biotechnol J2014,12,2:1
9Relapse of acne following isotretinoin treatment: a retrospective study of 405 patients 显示文摘Liu A Yang DJ Gerhardstein PC el al 2008J Drugs Dermatol2008,7,:1
10Effects of B and W alloying additions on the formation and stability of lamellar structures in two-phase y-TiAl 显示文摘Mazisaz P J Ramanujan R V Liu C T et el 1997Intermetallics1997,5,2:1
11SIR-Based Call Admission Control for DS-CDMA Cellular Systems显示文摘Zhao Liu El Zarki M 1994IEEE Journal on Selected Areas in Communications1994,12,:1
12Study on Defects in Hydrothermal-Grown KBe2 B03 F2 Crystals显示文摘YuJ Liu L Wang X el al 2011Journal of Crystal Grouth2011,318,:1
13Immunohistochemical profiling of Wnt,NF-κB,Stat3 and Notch signaling in human epidermal tumors显示文摘Liu Z Li Y Kong Q el al 2008J Dermatol Sci2008,52,2:1
14Surveiltanee and gene analysis of hemagglutinin of infltmaza virus during the outbreak of 1998-1999 in Beijing area 显示文摘Liu C G Zhu R N Wan L T el al 2000Chin J Microbiol Immunol2000,20,4:1
15Design and full scale test of the fuel handling system显示文摘Liu at el 2002Nucl Eng Design2002,218,:1
16An Apaf-1/cytochrome c muhimeric complex is a functional apoptosome that activates procaspase-9显示文摘Zou H Li Y Liu X el al 1999J Biol Chem1999,274,11:1
17Hypoglyeemia is more com- mon among type 2 diabeles patients with limited health liter- acy:the diabetes study of North California(DISTANCE)显示文摘Sarkar U Karter AJ Liu JY el al 2010Gen Intern Med2010,25,4:1
18Synthesis of resveratrol using a direct decarbonylative Heck approach from resorcylic acid 显示文摘Andros MB Liu J Meredith EL 2003Tetrahedron Lett2003,44,26:1
19Atmosphere manifestation of tropical instability wave observed by QuikSCAT and tropical rain measuring missions显示文摘LIU W T XIE X POLITO P S at el Geophys Res Lett0,27,:1
20Altered development of Xenopus embryos in a hypogeomagnetic field 显示文摘No WC Liu Y Cooper HM el al 2011Bioelectro- magnetics2011,33,3:1
返回顶部 每页显示:
共24页 首页 上一页 第1页 下一页 末页 /24 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费