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Comparison of N uptake and internal use efficiency in two tobacco varieties

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The Crop Journal 2015年第1期3卷 80-86页

作者： Wan Teng wenqing li Chunjian li Department of Plant Nutrition China Agricultural University Fujian Institute of Tobacco Agricultural Science

To explain the observation in field experiments that tobacco variety CB-1 was more nitrogen(N)-efficient than K326, the influence of two N levels on growth, N uptake and N flow within plants of the two tobacco varieties was studied. Xylem sap from the upper and lower leaves of both tobacco varieties cultured in quartz sand was collected by application of pressure to the root system. CB-1 took up more N with smaller roots at both high(HN, 10 mmol L-1) and low(LN, 1 mmol L-1) N levels, and built up more new tissues in upper leaves especially at LN level,than K326. Both varieties showed luxury N uptake, and CB-1 accumulated significantly less NO-3in new tissues than K326, when grown at the HN level. At both N levels, the amount of xylem-transported N and phloem-cycled N from shoot to root in K326 was greater than those in CB-1, indicating higher N use efficiency in CB-1 shoots than in K326 shoots. The major nitrogenous compound in the xylem sap was NO-3irrespective of N level and variety. Low N supply did not cause more NO-3reduction in the root. The results indicated that the N-efficient tobacco variety CB-1 was more efficient in both N uptake by smaller roots and N utilization in shoots, especially when grown at the LN level.

关键词： Nitrogen uptake Nitrogen cycling Nitrogen use efficiency Nicotiana tabacum

Effect of biochar applied with plant growth-promoting rhizobacteria(PGPR)on soil microbial community composition and nitrogen utilization in tomato

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Pedosphere 2021年第6期31卷 872-881页

作者： Yuan WANG wenqing li Binghai DU Hanhao li National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources Tai'an 271018(China) College of Resources and Environment Shandong Agricultural UniversityTai'an 271018(China) College of life Sciences Shandong Agricultural UniversityTai'an 271018(China)

Plant growth-promoting rhizobacteria(PGPR)represent an important microbial community group and have beneficial effects on plant growth and development.A pot experiment was conducted to study the effect of biochar applied with PGPR on the soil microbial community composition and nitrogen use efficiency(NUE)of tomato,which could provide a theoretical basis for rational *** treatments were designed:no nitrogen(N),PGPR,or biochar control(CK);biochar without N or PGPR(BCK);N without PGPR or biochar(U);N and PGPR without biochar(UP);N and biochar without PGPR(UB);and N,PGPR,and biochar(UBP).The tomato yield in the UP treatment was 9.09% lower than that in the U treatment,whereas that in the UB treatment was 19.93% higher than that in the U *** tomato yield in the UBP treatment was 32.45%,45.69%,and 10.44% higher than those in the U,UP,and UB treatments,*** combined with PGPR increased the relative abundance of Nitrospira and Bradyrhizobium in the *** the tomato maturity stage,the soil NO_(3)^(-)-N content in the UBP treatment was 87.12%,88.12%,and 31.04% higher than those in the U,UP,and UB treatments,*** NUE in the UP treatment was 4.03% lower than that in the U treatment,and that in the UBP treatment was 13.63%,17.66%,and 10.77% higher than those in the U,UP,and UB treatments,*** study showed that biochar combined with PGPR can improve soil microbial community structure and increase the NUE of tomato.

关键词： biological fertilizer microbial community structure nitrogen cycling nitrogen use efficiency tomato yield

Insect flight speed estimation analysis based on a full-polarization radar

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Science China(Information Sciences) 2018年第10期61卷 279-281页

作者： Cheng HU wenqing li Rui WANG Yuanhao li Weidong li Tianran ZHANG School of Information and Electronics Beijing Institute of Technology

Dear editor,As most migratory insects are nocturnal, the entomological radar with the advantage of all-time and all-weather application is the most effective technique for insect migration observation [1]. Generally, the current entomological radar could be categorized into the scanning radar and verticallooking radar (VLR). The aerial density of migration could be measured by the scanning radar,while the flight speed, displacement direction,

关键词： Figure Insect flight speed estimation analysis based on a full-polarization radar exp SNR

Design and Implementation of a 3D Ocean Virtual Reality and Visualization Engine

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Journal of Ocean University of China 2012年第4期11卷 481-487页

作者： CHEN Ge li Bo TIAN Fenglin JI Pengbo li wenqing Department of Marine Technology Ocean University of ChinaEngineering Research Center of Marine Information TechnologyMinistry of EducationQingdao 266100P.R.China School of Resources and Environment South West Petroleum UniversityChengdu 610500P.R.China Institute of Oceanographic Instrumentation Shandong Academy of SciencesQingdao 266001P.R.China

In this study,a 3D virtual reality and visualization engine for rendering the ocean,named VV-Ocean,is designed for marine *** design goals of VV-Ocean aim at high fidelity simulation of ocean environment,visualization of massive and multidimensional marine data,and imitation of marine ***-Ocean is composed of five modules,*** management module,resources management module,scene management module,rendering process management module and interaction management *** are three core functions in VV-Ocean:reconstructing vivid virtual ocean scenes,visualizing real data dynamically in real time,imitating and simulating marine lives *** on VV-Ocean,we establish a sea-land integration platform which can reproduce drifting and diffusion processes of oil spilling from sea bottom to *** factors such as ocean current and wind field have been considered in this *** this platform oil spilling process can be abstracted as movements of abundant oil *** result shows that oil particles blend with water well and the platform meets the requirement for real-time and interactive ***-Ocean can be widely used in ocean applications such as demonstrating marine operations,facilitating maritime communications,developing ocean games,reducing marine hazards,forecasting the weather over oceans,serving marine tourism,and so ***,further technological improvements of VV-Ocean are discussed.

关键词： ocean rendering engine virtual reality visualization imitation of marine lives oil spilling simulation

Potential role of punicalagin against oxidative stress nduced testicular damage

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Asian Journal of Andrology 2016年第4期18卷 627-632页

作者： Faiza Rao Hui Tian wenqing li Helong Hung Fei Sun Institute of ImmunologY and CAS Key Laboratory of Innate Immunity and Chronic Disease Innovation Center for Cell Biology School of Life Sciences and Medical Center University of Science and Technolosy of China Hefei 230027 China Department of life Science Hefei National Laboratory for Physical Sciences at Microscale Hefei 230027 China

Punlcalagin is isolated from pomegranate and widely used for the treatment of different diseases in Chinese traditional medicine. This study aimed to evaluate the effect of Punicalagin （purity L〉98%） on oxidative stress induced testicular damage and its effect on fertility. We detected the antioxidant potential of punicalagin in lipopolysaccharide （LPS） induced oxidative stress damage in testes, also tried to uncover the boosting fertility effect of Punicalagin （PU） against oxidative stress-induced infertility. Results demonstrated that 9 mg kg-1 for 7 days treatment significantly decreases LPS induced oxidative damage in testes and nitric oxide production. The administration of oxidative stress resulted in a significant reduction in testes antioxidants GSH, T-SOD, and CAT raised LPO, but treatment with punicalagin for 7 days increased antioxidant defense GSH, T-SOD, and CAT by the end of the experiment and reduced LPO level as well. PU also significantly activates Nrf2, which is involved in regulation of antioxidant defense systems. Hence, the present research categorically elucidates the protective effect of punicalagin against LPS induced oxidative stress induced perturbation in the process of spermatogenesis and significantly increased sperm health and number. Moreover, fertility success significantly decreased in LPS-injected mice compared to controls. Mice injected with LPS had fertility indices of 12.5%, while others treated with a combination of PU ＋ LPS exhibited 75% indices. By promoting fertility and eliminating oxidative stress and inflammation, PU may be a useful nutrient for the treatment of infertility.

关键词： fertility oxidative stress punicalagin sperm parameters testicular damage

Observation of the nighttime nitrate radical in Hefei, China

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Journal of Environmental Sciences 2008年第1期20卷 45-49页

作者： li Suwen liU wenqing XIE Pinua li Ang QIN Min PENG Fumin ZHU Yanwu Key Laboratory of Environmental Optical and Technology Anhui Institute of Optics and Fine MechanicsChinese Academy of Sciences Hefei 230031 China

Observation of nighttime nitrate radical （NO3） was performed by using long path differential optical absorption spectroscopy （LP- DOAS）, on the outskirts of Hefei, China. The time series of NO3 and supporting parameters were simultaneously measured for a week （31 May-7 June 2006）. The results indicated that the average concentration of NO3 was 15.6 pptv with an average lifetimes of 96 s, whereas, NO3 production rates varied from 8×10^2/（cm^3·s） to 2.98×10^7/（cm^3·s）. Furthermore, the calculated N2O5 concentration averaged at 380 pptv. Analysis of data indicated that direct sinks were probably dominating the NO3 loss process during this campaign. The results were compared with other campaigns in the boundary layer.

关键词： nitrate radical nighttime chemistry differential optical absorption spectroscopy sinks

Correlation Between Dynamic Compressive Strength and Fracture Behaviors of Bulk Metallic Glasses

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Acta Metallurgica Sinica(English Letters) 2020年第10期33卷 1407-1415页

作者： wenqing li Zhengwang Zhu Guojie li Long Zhang Zhengkun li Huameng Fu Hongwei Zhang Hong li Aimin Wang Haifeng Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Beijing Institute of Space Long March Vehicle Beijing 10076China

The mechanical behaviors of Zr43.5Cu43.5Ni4Al8Nb1,Zr55.4Cu31.6Ni4Al8Nb1,Ti32.8Zr30.2Ni5.3Cu9Be22.7(at.%)metallic glass at different strain rates were *** all the present alloys,the dispersion over 700 MPa was observed on the strength in the repeated dynamic compressions,which was much stronger than that of the quasi-static compressive *** the dispersion of the dynamic compressive strength was well correlated with the corresponding fracture *** area of fracture surface was calculated and also showed a strong dispersion for all the fractured specimens tested at the strain rate of 500 s^-1 and 1000 s^-*** the specimens showed a linear relationship between the square of dynamic compressive strength and the area of fracture surface in the dynamic compression *** phenomenon was mainly thought to be related to the difference of mean initial free volume concentration of different samples,stress concentration caused by the split Hopkinson pressure bar experimental setup and high sensitivity of defects under dynamic *** findings were beneficial to deeply understand the effect of strain rate on the mechanical properties of the metallic glass.

关键词： Metallic glass Dynamic compression Weibull statistics Shear bands

Coastal buoy observation of air-sea net heat flux in the East China Sea in summer 2020

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Journal of Oceanology and limnology 2022年第3期40卷 907-921页

作者： Yuting HAN Yangang li Changsan XU Lei liU Yanling ZHAO wenqing li Xiangzhou SONG Key Laboratory of Marine Hazards Forecasting Ministry of Natural Resources(MNR)Hohai UniversityNanjing 210024China National Marine Environmental Forecasting Center(NMEFC) Beijing 100081China East China Sea Bureau of MNR Shanghai 200081China Institute of Oceanographic Instrumentation Qilu University of TechnologyQingdao 266075China The PLA 31010 Units Beijing 100081China

The full fluxes and associated air-sea variables based on three months of operational buoy observations in the East China Sea(ECS)in summer 2020 were analyzed for the first *** surface net heat flux(Q_(net))was positive(139.7±77.7 W/m^(2))and was dominated by the combined eff ects of solar shortwave radiation(SW)and latent heat fluxes(LH).The mean heat flux components of 4 reanalysis datasets(NCEP2,MERRA-2,CFSR,and ERA5)and buoy data were compared to assess the mean ability of the modeling/reanalysis *** the four components of air-sea flux,SW was the best simulated,while LH was the worst *** longwave radiation(LW)and LH values from reanalysis were higher than those from buoy data,especially *** high LH resulted in low Q_(net).Furthermore,the 4 reanalysis datasets were compared with the buoy *** all flux products,the difference in radiation flux was the smallest,while that in the turbulent flux was the *** observed variables related to turbulent flux were analyzed to help determine the cause of the flux *** wind speeds were the main cause of this *** the variables provided by the reanalysis data and the same bulk formulas of the Coupled Ocean-Atmospheric Response Experiment(COARE 3.0),we found that the recalculated sensible heat flux(SH)and LH were closer to the observed heat fluxes than the direct model *** signifi cant diff erences between these methods could account for the discrepancies among diff erent *** all air-sea flux products,the air-sea flux in ERA5 was closer to the in-situ observations than the other *** comparison results of reanalysis data provide an important reference for more accurate studies of the summer heat flux in the ECS at the synoptic and climatic scales.

关键词： buoy observations East China Sea air-sea turbulent heat flux radiative flux reanalysis

Recent progress about 2D metal dichalcogenides: Synthesis and application in photodetectors

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Nano Research 2021年第6期14卷 1819-1839页

作者： Yongfeng Pei Rui Chen Hang Xu Dong He Changzhong Jiang wenqing li Xiangheng Xiao Department of Physics and Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education Hubei Nuclear Solid Physics Key LaboratoryWuhan UniversityWuhan430072China

In recent years, two-dimensional (2D) layered metal dichalcogenides (MDCs) have received enormous attention on account of their excellent optoelectronic properties. Especially, various MDCs can be constructed into vertical/lateral heterostructures with many novel optical and electrical properties, exhibiting great potential for the application in photodetectors. Therefore, the batch production of 2D MDCs and their heterostructures is crucial for the practical application. Recently, the vapour phase methods have been proved to be dependable for growing large-scale MDCs and related heterostructures with high quality. In this paper, we summarize the latest progress about the synthesis of 2D MDCs and their heterostructures by vapour phase methods. Particular focus is paid to the control of influence factors during the vapour phase growth process. Furthermore, the application of MDCs and their heterostructures in photodetectors with outstanding performance is also outlined. Finally, the challenges and prospects for the future application are presented.

关键词： metal dichalcogenides vertical/lateral heterostructures vapour phase methods photodetectors