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| 1 | Spatial-temporal dynamics of desert vegetation and its responses to climatic variations over the last three decades:a case study of Hexi region in Northwest China显示文摘Analysis of spatial-temporal variations of desert vegetation under the background of climate changes can provide references for ecological restoration in arid and semi-arid areas.In this study,we used the Global Inventory Modeling and Mapping Studies(GIMMS)NDVI data from 1982 to 2006 and Moderate Resolution Imaging Spectroradiometer(MODIS)NDVI data from 2000 to 2013 to reveal the dynamics of desert vegetation in Hexi region of Northwest China over the past three decades.We also used the annual temperature and precipitation data acquired from the Chinese meteorological stations to analyze the response of desert vegetation to climatic variations.The average value of NDVImax(the maximum NDVI during the growing season)for desert vegetation in Hexi region increased at the rate of 0.65×10–3/a(P<0.05)from 1982 to 2013,and the significant increases of NDVImax mainly appeared in the typical desert vegetation areas.Vegetation was significantly improved in the lower reaches of Shule and Shiyang river basins,and the weighted mean center of desert vegetation mainly shifted toward the lower reaches of the two basins.Almost 95.32% of the total desert vegetation area showed positive correlation between NDVImax and annual precipitation,indicating that precipitation is the key factor for desert vegetation growth in the entire study area.Moreover,the areas with non-significant positive correlation between NDVImax and annual precipitation mainly located in the lower reaches of Shiyang and Shule river basins,this may be due to human activities.Only 7.64% of the desert vegetation showed significant positive correlation between NDVImax and annual precipitation in the Shule River Basin(an extremely arid area),indicating that precipitation is not the most important factor for vegetation growth in this basin,and further studies are needed to investigate the mechanism for this phenomenon. | YANG Xuemei LIU Shizeng YANG Taibao XU Xianying KANG Caizhou TANG Jinnian WEI Huaidong Mihretab G GHEBREZGABHER LI Zhiqi | 2016 | Journal of Arid Land2016，8，4： | 10 |
| 2 | Assessment of desertification in Eritrea: land degradation based on Landsat images显示文摘Remote sensing is an effective way in monitoring desertification dynamics in arid and semi-arid regions.In this study,we used a decision tree method based on NDVI(normalized difference vegetation index),SAVI(soil adjusted vegetation index),and vegetation cover proportion to quantify and analyze the desertification in Eritrea using Landsat data of the 1970 s,1980 s and 2014.The results demonstrate that the NDVI value and the annual mean precipitation declined while the temperature increased over the past 40 a.Strongly desertified land increased from 4.82×10^4 km^2(38.5%)in the 1970 s to 8.38×10^4 km^2(66.9%)in 2014:approximately 85%of the land of the country was under serious desertification,which significantly occurred in arid and semi-arid lowlands of the country(eastern,northern,and western lowlands)with relatively scarce precipitation and high temperature.The non-desertified area,mostly located in the sub-humid eastern escarpment,also declined from approximately 2.1%to 0.5%.The study concludes that the desertification is a cause of serious land degradation in Eritrea and may link to climate changes,such as low and unpredictable precipitation,and prolonged drought. | Mihretab G GHEBREZGABHER YANG Taibao YANG Xuemei WANG Congqiang | 2019 | Journal of Arid Land2019，11，3： | 2 |
| 3 | Scaled- up production of zero - trans margarine fat using pine nut oil and palm stearin显示文摘 | PRAKASH A ZHU Xuemei ANUPAMA G | 2010 | Food Chemistry2010，119，： | 1 |
| 4 | lm pacts of different emission sources on air quality during March 2001 in the Pearl River Delta (PRD) region显示文摘 | WANG Xuemei CARMICHAEL G CHEN Deliang | 2005 | Atmospheric Environment2005，39，29： | 1 |
| 5 | Association between lower extremity posture at contact and peak knee valgus moment during sidestepping: Implications for ACL injury 显示文摘 | Scott G McLean Huang Xuemei Antonie J van den Bogert | 2005 | Clinical Biomechanics2005，20，： | 1 |
| 6 | Mortality trends in the general population:the importanceof cardiorespiratory fitness显示文摘 | Duek-chul Lee Enrique G Artero Xuemei Sui | 2010 | Journal of Psychophar-macology2010，24，11： | 1 |
| 7 | A prospective CBCT study of upper airway changes after rapid maxillary expansion显示文摘 | Jingjing Z Xuemei G | 2013 | Int J Pediatr Otorhinolaryngol2013，77，11： | 1 |
| 8 | Spatial Distribution and Contamination Assessment of Heavy Metals in Urban Road Dusts from Urumqi,NW China显示文摘 | Wei B G Jiang F Q Li Xuemei | | 0，，2： | 1 |
| 9 | Impacts of different emission sources on air quality during March 2001 in the Pearl River Delta (PRD) region显示文摘 | WANG Xuemei CARMICHAEL G CHEN Deliang | 2005 | Atmos Environ2005，39，： | 1 |
| 10 | On the best constant in Hilbert's inequality 显示文摘 | Krnid M Mingzhe G Pe~arid J Xuemei G | 2005 | Math Ineq Appl2005，8，31： | 1 |
| 11 | Short-time fourier transform receiver for non-stationary interference excision in direct sequence spread spectrum communication显示文摘 | Ouyang Xuemei Moeness G A | 2001 | IEEE Trans on Signal Processing2001，49，4： | 1 |
| 12 | Short-time Fourier transformreceiver for nonstationary interference excision in direct sequencespread spectrum communications 显示文摘 | Xuemei Ouyang Moeness G Amin | 2001 | IEEE Transactions on SignalProcessing (S1053-587X)2001，49，4： | 1 |
| 13 | Reciprocal generation of Thl/Thl7 and Treg ceils by BI and B2 B cells显示文摘 | Xuemei Z Wenda G | 2007 | Eur J lmmunol2007，37，9： | 1 |
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