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| 1 | Spatial-temporal variation in soil respiration and its controlling factors in three steppes of Stipa L. in Inner Mongolia, China显示文摘Grassland is the largest terrestrial ecosystem in China. It is of great significance to measure accurately the soil respiration of different grassland types for the contribution evaluation of the Chinese terrestrial ecosystem’s carbon emission to the atmospheric CO2 concentration. A three-year (2005-2007) field experiment was carried out on three steppes of Stipa L. in the Xilin River Basin, Inner Mongolia, China, using a static opaque chamber technique. The seasonal and interannual variations of soil respiration rates were analyzed, and the annual total soil respiration of the three steppes was estimated. The numerical models between soil respiration and water-heat factors were established respectively. Similar seasonal dynamic and high annual and interannual variations of soil respiration were found in all of the three steppes. In the growing season, the fluctuation of soil respiration was particularly evident. The coefficients of variation (CVs) for soil respiration in different growing seasons ranged from 54% to 93%, and the annual CVs were all above 115%. The interannual CV of soil respiration progressively decreased in the order of Stipa grandis (S. grandis) steppe > Stipa baicalensis (S. baicalensis) steppe > Stipa krylovii (S. krylovii) steppe. The annual total soil respiration for the S. baicalensis steppe was 223.62?299.24 gC m-2 a-1, 150.62-226.99 gC m-2 a-1 for the S. grandis steppe, and 111.31–131.55 gC m-2 a-1 for the S. krylovii steppe, which were consistent with the precipitation gradient. The variation in the best fitting temperature factor explained the 63.5%, 73.0%, and 73.2% change in soil respiration in the three steppes at an annual time scale, and the corresponding Q10 values were 2.16, 2.98, and 2.40, respectively. Moreover, the Q10 values that were calculated by soil temperature at different depths all expressed a 10 cm > 5 cm > surface in the three sampling sites. In the growing season, the soil respiration rates were related mostly to the surface soil moisture, and the 95.2%, 97.4%, and 93.2% variations in soil respiration in the three steppes were explained by the change in soil moisture at a depth of 0-10 cm, respectively. | QI YuChun DONG YunShe LIU LiXin LIU XingRen PENG Qin XIAO ShengSheng HE YaTing | 2010 | Science China Earth Sciences2010，53，5： | 12 |
| 2 | Litter mixing significantly affects decomposition in the Hulun Buir meadow steppe of Inner Mongolia, China显示文摘Aims We explored the decomposition rates of single-and mixed-species litter,the litter-mixing effect and the effect of component litters in a mixture on decomposition.Methods In a litter bag experiment,shoot litters from two dominant grasses(Leymus chinensis and Stipa baicalensis)and one legume(Melissitus ruthenica)were decomposed separately and as a mixture from May 2010 to September 2011 in the Hulun Buir meadow steppe of Inner Mongolia,China.We separated the litter mixture into its individual component litters(i.e.the different single-species litters)and analyzed the changes in litter mass remaining and litter nitrogen(N)remaining during single-and mixed-species litter decomposition.Important Findings(i)Litter mixing had significant positive effects on litter decomposition.The litter-mixing effect was strongest for the mixture of S.baicalensis and L.chinensis litters,followed by the mixture of S.baicalensis and M.ruthenica litters.(ii)Single-species component litters decomposed faster in the mixtures than separately(positive effect),but these effects were not significant for legume species M.ruthenica litter.Relative to single-species litter decomposition,the decomposition rates of the two grass(S.baicalensis and L.chinensis)litters significantly increased when they were mixed with each other or with M.ruthenica litter.(iii)For each species litter type,the percentage of litter N remaining during decomposition(NR)differed between the single-species litter and mixed litter treatments.The NR of S.baicalensis litter was higher when it was decomposed in the mixture than in isolation.However,the NR of L.chinensis litter was lowest in its mixture with M.ruthenica among the treatments.Regardless of its decomposition in the mixture or in isolation,the NR of M.ruthenica litter varied little among treatments.There was a significant positive relationship between the NR and percentage of initial litter mass remaining in both the single litter and mixed litter treatments.These results suggest that N transfer may happen among component litters in mixture and further affect the decomposition. | Caihong Zhang Shenggong Li Leiming Zhang Xiaoping Xin Xingren Liu | 2014 | Journal of Plant Ecology2014，7，1： | 6 |
| 3 | Nrf2 epigenetic derepression induced by running exercise protects against osteoporosis显示文摘Osteoporosis(OP)is a common skeletal disease involving low bone mineral density(BMD)that often leads to fragility fracture,and its development is affected by multiple cellular pathologies and associated with marked epigenetic alterations of osteogenic genes.Proper physical exercise is beneficial for bone health and OP and reportedly possesses epigenetic modulating capacities;however,whether the protective effects of exercise on OP involve epigenetic mechanisms is unclear.Here,we report that epigenetic derepression of nuclear factor erythroid derived 2-related factor-2(Nrf2),a master regulator of oxidative stress critically involved in the pathogenesis of OP,mediates the significant osteoprotective effects of running exercise(RE)in a mouse model of OP induced by ovariectomy.We showed that Nrf2 gene knockout(Nfe2l2^(−/−))ovariectomized mice displayed a worse BMD reduction than the controls,identifying Nrf2 as a critical antiosteoporotic factor.Further,femoral Nrf2 was markedly repressed with concomitant DNA methyltransferase(Dnmt)1/Dnmt3a/Dnmt3b elevations and Nrf2 promoter hypermethylation in both patients with OP and ovariectomized mice.However,daily 1-h treadmill RE significantly corrected epigenetic alterations,recovered Nrf2 loss and improved the femur bone mass and trabecular microstructure.Consistently,RE also normalized the adverse expression of major osteogenic factors,including osteoblast/osteoclast markers,Nrf2 downstream antioxidant enzymes and proinflammatory cytokines.More importantly,the RE-conferred osteoprotective effects observed in the wild-type control mice were largely abolished in the Nfe2l2^(−/−)mice.Thus,Nrf2 repression due to aberrant Dnmt elevation and subsequent Nrf2 promoter hypermethylation is likely an important epigenetic feature of the pathogenesis of OP,and Nrf2 derepression is essential for the antiosteoporotic effects of RE. | Xingren Chen Xiaobo Zhu Ai Wei Fang Chen Qi Gao Ke Lu Qing Jiang Wangsen Cao | 2021 | Bone Research2021，9，2： | 6 |
| 4 | Simulated NH_4^+-N Deposition Inhibits CH_4 Uptake and Promotes N_2O Emission in the Meadow Steppe of Inner Mongolia, China显示文摘Few studies are conducted to quantify the effects of enhanced N deposition on soil nitrous oxide(N_2O) emission and methane(CH_4) uptake in the meadow steppe of Inner Mongolia, China. A two-year field experiment was conducted to assess the effects of nitrogen(N) deposition rates(0, 10, and 20 kg N ha^(-1)year^(-1) as(NH_4)2SO_4) on soil N_2O and CH_4 fluxes. The seasonal and diurnal variations of soil N_2O and CH_4 fluxes were determined using the static chamber-gas chromatography method during the two growing seasons of 2008 and 2009. Soil temperature, moisture and mineral N(NH_4^+-N and NO-3-N) concentration were simultaneously measured. Results showed that low level of(NH_4)2SO_4(10 kg N ha-1year-1) did not significantly affect soil CH_4 and N_2O fluxes and other variables. High level of(NH_4)_2SO_4(20 kg N ha^(-1)year) significantly increased soil NO-3-N concentration by 24.1% to35.6%, decreased soil CH_4 uptake by an average of 20.1%, and significantly promoted soil N_2O emission by an average of 98.2%.Soil N_2O emission responded more strongly to the added N compared to CH_4 uptake. However, soil CH_4 fluxes were mainly driven by soil moisture, followed by soil NO-3-N concentration. Soil N_2O fluxes were mainly driven by soil temperature, followed by soil moisture. Soil inorganic N availability was a key integrator of soil CH_4 uptake and N_2O emission. These results suggest that the changes of availability of inorganic N induced by the increased N deposition in soil may affect the CH_4 and N_2O fluxes in the cold semi-arid meadow steppe over the short term. | LIU Xingren ZHANG Qingwen LI Shenggong ZHANG Leiming REN Jianqiang | 2017 | Pedosphere2017，27，2： | 4 |
| 5 | Optics and Spectral Investigation in Dy^(3+)-Doped Borate Glasses显示文摘Dy 3+ -doped borate glasses (LBLB) with high effective visible fluorescence emission were synthesized. The absorption spectrum and fluorescence spectrum of this glass were measured and analyzed. By using J-O theory, the oscillator strengths for some absorption transitions were calculated according to the absorption spectra. The intensity parameters Ω_t (t=2, 4, 6) of Dy 3+ were determined by using a least-squares fitting approach, and the values are 4.04×10 -20 , 1.30×10 -20 and 1.82×10 -20 cm, respectively. The root-mean-square deviation δ_ rms was calculated. Under UV light excitation, Dy 3+ -doped borate glasses (LBLB) emit intense yellowish white lights. The excitation spectrum indicates that argon laser is the effective excitation source in Dy 3+ -doped LBLB glasses. | Hou Yanyan Yang Hongxia Lin Hai Ma Tiecheng Zhai Bin Wang Xiaojun Liu Xingren | 2005 | Journal of Rare Earths2005，23，6： | 2 |
| 6 | THE NCEP CLIMATE FORECAST SYSTEM REANALYSIS显示文摘 | Saha Suranjana Moorthi Shrinivas Pan Hua-Lu Wu Xingren Wang Jiande Nadiga Sudhir Tripp Patrick Kistler Robert Woollen John Behringer David Liu Haixia Stokes Diane Grumbine Robert Gayno George Wang Jun Hou Yu-Tai Chuang Hui-ya Juang Hann- | 2010 | Bulletin of the American Meteorological Society2010，，8： | 2 |
| 7 | Simulation Credibility 显示文摘 | Zhang Wei Wang Xingren | 2001 | Journal of System Simulation (S1004-731X)2001，13，3： | 1 |
| 8 | Spectroscopic property and energy transfer of the Ce3+ and Eu2+ ions in Ca8Mg(SiO4)4Cl2 显示文摘 | Lin Hai Lin Jiuling Liu Xingren | 1996 | Spectroscopy and Spectroscopic Analysis1996，18，6： | 1 |
| 9 | 显示文摘 | Huang Lihui Liu Xingren Wu Xu | 2001 | J Appl Phys2001，90，11： | 1 |
| 10 | Development of light-weight aggregate from dry sewage sludge and coal ash显示文摘 | Wang Xingren Jin Yiying Wang Zhiyu | 2009 | Waste Managernent2009，29，4： | 1 |
| 11 | The NCEP Climate Forecast System version 2 显示文摘 | Suranjana Saha Shrinivas Moorthi Xingren Wu | 2014 | Jour- nal of Climate2014，27，6： | 1 |
| 12 | A reliable argument principle algorithm to find the number of zeros of an analytic function in a bounded domain显示文摘 | Xingren Ying I. Norman Katz | 1988 | Numerische Mathematik1988，，1： | 1 |
| 13 | An assessment of the surface climate in the NCEP climate forecast system reanalysis显示文摘 | Wanqiu Wang Pingping Xie Soo-Hyun Yoo Yan Xue Arun Kumar Xingren Wu | 2011 | Climate Dynamics2011，，7： | 1 |
| 14 | The development of system modeling and simulation technologies in China显示文摘 | Wang Xingren Wen Chuanyuan Li Bohu | 2009 | Journal of System Simulation2009，21，21： | 1 |
| 15 | Room Temperature Intense Emission at 1 534 nm in Er3+ Doped Gd3Al2Si3012 Glass显示文摘 | Huang Lihui Liu Xingren Lin Hai | 2000 | Applied Physics Letters2000，77，18： | 1 |
| 16 | Luminescence properties of Pr3+ and energy transfer characteristics of Pr3+→Gd3+ in CaSiO3显示文摘 | Chu Benli Liu Xingren Wang Xiaojun | 2002 | Spectroscopy Spectral Analysis2002，22，4： | 1 |
| 17 | Spectroscopic properties and intense red-light emission of (Ca, Eu, M)W04 (M =Mg, Zn, Li) 显示文摘 | Shi Shikao Liu Xingren Gao Jing Zhou Ji | 2008 | Spectrochimica Acta Part A2008，69，2： | 1 |
| 18 | The method of uneer- rain nonlinear system fault detection based on the fuzzy observer 显示文摘 | Song Hua Zhang Hongyue Wang Xingren | 2005 | Space control2005，23，3： | 1 |
| 19 | Optical absorption and photoluminescence in Sm 3+ - and Eu 3+ -doped rare-earth borate glasses显示文摘 | Hai Lin Dianlai Yang Guishan Liu Tiecheng Ma Bin Zhai Qingda An Jiayou Yu Xiaojun Wang Xingren Liu Edwin Yue-Bun Pun | 2004 | Journal of Luminescence2004，，1： | 1 |
| 20 | The role of bias correction on subseasonal prediction of Arctic sea ice during summer 2018显示文摘Subseasonal Arctic sea ice prediction is highly needed for practical services including icebreakers and commercial ships,while limited by the capability of climate models.A bias correction methodology in this study was proposed and performed on raw products from two climate models,the First Institute Oceanography Earth System Model(FIOESM)and the National Centers for Environmental Prediction(NCEP)Climate Forecast System(CFS),to improve 60 days predictions for Arctic sea ice.Both models were initialized on July 1,August 1,and September 1 in 2018.A 60-day forecast was conducted as a part of the official sea ice service,especially for the ninth Chinese National Arctic Research Expedition(CHINARE)and the China Ocean Shipping(Group)Company(COSCO)Northeast Passage voyages during the summer of 2018.The results indicated that raw products from FIOESM underestimated sea ice concentration(SIC)overall,with a mean bias of SIC up to 30%.Bias correction resulted in a 27%improvement in the Root Mean Square Error(RMSE)of SIC and a 10%improvement in the Integrated Ice Edge Error(IIEE)of sea ice edge(SIE).For the CFS,the SIE overestimation in the marginal ice zone was the dominant features of raw products.Bias correction provided a 7%reduction in the RMSE of SIC and a 17%reduction in the IIEE of SIE.In terms of sea ice extent,FIOESM projected a reasonable minimum time and amount in mid-September;however,CFS failed to project both.Additional comparison with subseasonal to seasonal(S2S)models suggested that the bias correction methodology used in this study was more effective when predictions had larger biases. | Jiechen Zhao Qi Shu Chunhua Li Xingren Wu Zhenya Song Fangli Qiao | 2020 | Acta Oceanologica Sinica2020，39，9： | 1 |
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