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Straw return influences the structure and functioning of arbuscular mycorrhizal fungal community in a rice-wheat rotation system

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Pedosphere 2024年第2期34卷 339-350页

作者： Silong ZHAI Junjie XIE Zongyi TONG Bing YANG Weiping CHEN Roger TKOIDE yali meng Xiaomin HUANG Atta Mohi Ud DIN Changqing CHEN Haishui YANG College of Agriculture Nanjing Agricultural UniversityNanjing 210095China Department of Biology Brigham Young UniversityProvo UT 84602USA Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology Agricultural College of Yangzhou UniversityYangzhou 225009China National Research Center of Intercropping The Islamia University of BahawalpurBahawalpur 63100Pakistan Jiangsu Collaborative Innovation Center for Modern Crop Production Nanjing Agricultural UniversityNanjing 210095China

Straw return is a sustainable soil fertility-building practice,which can affect soil microbial ***,how straw return affects arbuscular mycorrhizal fungi(AMF)is not well ***,we studied the impacts of different straw management treatments over eight years on the structure and functioning of AMF communities in a rice-wheat rotation *** straw management treatments included no tillage with no straw(NTNS),rotary tillage straw return(RTSR),and ditch-buried straw return(DBSR).The community structure of AMF was characterized using high-throughput sequencing,and the mycorrhizal functioning was quantified using an in situ mycorrhizal-suppression *** straw management treatments formed unique AMF community structure,which was closely related to changes in soil total organic carbon,available phosphorus,total nitrogen,ammonium,and *** compared with NTNS,RTSR significantly increased Shannon diversity in 0–10 cm soil layer,while DBSR increased it in 10–20 cm soil layer;DBSR significantly increased hyphal length density in the whole ploughing layer(0–20 cm),but RTSR only increased it in the subsurface soil layer(10–20 cm).The mycorrhizal responses of shoot biomass and nutrient(N and P)uptake were positive under both straw return treatments(RTSR and DBSR),but negative under *** community composition of AMF was significantly correlated to hyphal length density,and the latter was further a positive predictor for the mycorrhizal responses of plant growth and nutrient *** findings suggest that straw return can affect AMF community structure and functioning,and farmers should manage mycorrhizas to strengthen their beneficial effects on crop production.

关键词： community structure hyphal length density shoot biomass shoot N uptake shoot P uptake soil physicochemical properties straw management tillage

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水下软体蛇三维转向机构设计及仿真

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现代电子技术 2024年第14期47卷 115-121页

作者：孟亚莉崔文龙史航上海大学机电工程与自动化学院上海200444

为了解决当前水下软体机器蛇实现三维转向的问题,设计一种水下软体机器蛇三维转向机构。通过ABAQUS有限元仿真软件进行验证,利用仿真数据标定了机构变形时,方位角与载荷压力比、弯曲角与基准压力和压力比之间的关系,从而建立了将载荷压... 详细信息

为了解决当前水下软体机器蛇实现三维转向的问题,设计一种水下软体机器蛇三维转向机构。通过ABAQUS有限元仿真软件进行验证,利用仿真数据标定了机构变形时,方位角与载荷压力比、弯曲角与基准压力和压力比之间的关系,从而建立了将载荷压力与弯曲角度和方向相关联的开环控制模型。利用控制算法控制三维转向机构,能够在空间内实现任意角度的转向。仿真结果证实,该设计在任意角度转向控制方面表现良好,0°~60°范围内的弯曲角最大误差仅为1.31071°,方位角最大误差仅为3.60489°。在控制仿真中,弯曲角和方位角的最大误差率分别为2.185%和1.001%。仿真结果证明了该设计的可发展性,为软体水蛇三维转向的实现提供了理论支撑。

关键词：软体蛇形机器人三维转向 ABAQUS 有限元仿真开环控制模型载荷压力参数标定

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Changes in equilibrium-line altitude and implications for glacier evolution in the Asian high mountains in the 21st century

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Science China Earth Sciences 2022年第7期65卷 1308-1316页

作者： Keqin DUAN Tandong YAO Ninglian WANG Peihong SHI yali meng School of Geography and Tourism Shaanxi Normal UniversityXi'an 710062China Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China College of Urban and Environmental Sciences Northwest UniversityXi'an 710127China

In the context of global warming,glaciers in the Asian High Mountains(AHMs)are shrinking at an accelerating *** their future change is helpful for understanding the hydrological and climatic effects related to glacier ***,we projected glacier change in the AHMs from 1979 to 2100 under shared socioeconomic pathway(SSP)scenarios from the perspective of temperature,equilibrium-line altitude(ELA),and accumulation *** annual mean temperature in the AHMs increased by 1.26℃ from 1979 to 2014,corresponding to an increase of 210 m in the mean ELA and a decrease of 1.7×10^(4)km^(2) in the glacier accumulation *** the SSP2-4.5(SSP5-8.5)scenario,the annual mean temperature in the AHMs would increase by 2.84℃(3.38℃)in 2040–2060 relative to that in 1850–1900,leading to the mean ELA reaching an elevation of5661 m(5777 m).The accumulation area in the AHMs decreased by 46.3%from 1995 to 2014 and was projected to decrease by60.1%in 2040–***,the annual mean temperature in the AHMs was projected to increase by 3.76℃(6.44℃)in2080–2100 relative to that in 1850–1900,corresponding to the ELA reaching an elevation of 5821 m(6245 m)and the accumulation area decreasing to 1.8×10^(4)km^(2)(0.5×10^(4)km^(2)).These data suggest that the conditions for glacier development will disappear in most of the AHMs,except for extreme high-altitude regions in the Tianshan,Pamir,and Himalaya *** the SSP2-4.5(SSP5-8.5)scenario,when the global mean temperature increases 1.5℃(2℃)above pre-industrial levels,the annual mean temperature will increase by 2.12℃(2.86℃)and the accumulation area will decrease by 15%(48%)in the AHMs compared with that in 1995–***,a 1.5℃ increase in global warming would keep 40%more of the glacial accumulation area(1.5×10^(4)km^(2))in the AHMs compared to a 2℃ increase in global warming.

关键词： Asia High Mountains Glacier Equilibrium-line altitude Accumulation area CMIP6

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秸秆与生物炭对棉田碱性土壤NH_(3)挥发与N_(2)O排放的影响

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农业环境科学学报 2024年第2期43卷 442-451页

作者：郭儆瑜金文刘志涛程照瑞赵文青孟亚利南京农业大学农学院/农业农村部作物生理生态与生产管理重点实验室/江苏省现代作物生产协同创新中心南京210095

为探究秸秆和秸秆生物炭连续添加5 a后对土壤氨(NH_(3))挥发和氧化亚氮(N_(2)O)排放的影响,并确定合理的秸秆还田措施,以降低碱性棉田氮损失。本研究基于等碳量输入,设置秸秆翻埋、秸秆催腐+覆盖还田、秸秆生物炭翻埋和不还田对照共4个... 详细信息

为探究秸秆和秸秆生物炭连续添加5 a后对土壤氨(NH_(3))挥发和氧化亚氮(N_(2)O)排放的影响,并确定合理的秸秆还田措施,以降低碱性棉田氮损失。本研究基于等碳量输入,设置秸秆翻埋、秸秆催腐+覆盖还田、秸秆生物炭翻埋和不还田对照共4个处理,氮磷钾肥统一施用。结果表明:秸秆生物炭翻埋下土壤NH_(3)挥发和N_(2)O排放分别较不还田对照显著降低27.3%和56.7%,主要归因于生物炭显著抑制土壤羟胺还原酶与硝酸还原酶活性,增加棉花氮吸收量,也与生物炭自身的强吸附能力有关。而秸秆翻埋、秸秆催腐+覆盖还田分别较对照增加NH3挥发37.2%和21.2%,但减少N2O排放17.1%和38.3%,这两种秸秆还田方式均显著促进土壤有机氮矿化和羟胺还原酶活性,抑制硝酸还原酶活性。冗余分析(RDA)结果表明羟胺还原酶和棉花氮吸收是土壤NH3挥发和N_(2)O排放的主要影响因子,解释率分别为64.8%和20.1%。研究表明,秸秆生物炭翻埋对NH_(3)和N_(2)O减排的综合效果优于秸秆,是碱性棉田土壤值得推荐的氮减排措施。

关键词：秸秆生物炭 NH_(3) N_(2)O 氮循环酶碱性土壤

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基于CMIP6多模式的黄土高原气温变化模拟评估及情景预估

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水土保持研究 2024年第2期31卷 158-167页

作者：豆明玉段克勤石培宏孟雅丽陈荣侯晓静陕西师范大学地理科学与旅游学院西安710119

[目的]明晰黄土高原未来气温增加趋势和幅度,以期为黄土高原未来气温变化决策事件和防洪减灾等提供参考。[方法]基于第六次国际耦合模式比较计划(CMIP6)中的22个地球-气候系统模式的模拟结果,通过观测数据系统评估了各模式历史时期(1961... 详细信息

[目的]明晰黄土高原未来气温增加趋势和幅度,以期为黄土高原未来气温变化决策事件和防洪减灾等提供参考。[方法]基于第六次国际耦合模式比较计划(CMIP6)中的22个地球-气候系统模式的模拟结果,通过观测数据系统评估了各模式历史时期(1961—2014年)模拟能力后,选用较好的10个模式的集合平均,对不同共享社会经济路径(SSPs)下黄土高原2015—2100年气温的时空变化特征进行了分析。[结果]在SSP1-2.6,SSP2-4.5,SSP3-7.0和SSP5-8.5情景下,2015—2100年黄土高原增温速率分别达到了0.09℃/10 a,0.28℃/10 a,0.48℃/10 a,0.66℃/10 a,且相对于1995—2014年,2081—2100年增温分别达1.53℃,2.69℃,3.83℃,5.25℃。除SSP1-2.6情景外,其余情景增温已远远超过《巴黎协定》全球2℃升温的目标,而且在SSP5-8.5情景下,2041—2060年增温已达2.44℃。SSP5-8.5情景下,2081—2100年黄土高原春、夏、秋和冬季气温相对于1995—2014年增温幅度变化范围为3.83~4.75℃,4.75~5.67℃,4.98~5.67℃,4.29~5.67℃。[结论]未来黄土高原将面临强大的增温压力,排放情景越高增温越显著,未来应加强对黄土高原气温的观测研究。

关键词： CMIP6 气温黄土高原 SSP情景未来时期

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Projected Regional 1.50℃and 2.00℃Warming Threshold-crossing Time Worldwide Using the CMIP6 Models

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Chinese Geographical Science 2023年第6期33卷 1095-1108页

作者： meng yali DUAN Keqin SHANG Wei SHI Peihong LI Shuangshuang CHENG Ying CHEN Rong ZHANG Zhaopeng School of Geography and Tourism Shaanxi Normal UniversityXi’an710119China

The Paris Agreement aims to limit global warming to well below 2.00℃and pursue efforts to limit the temperature increase to 1.50℃.However,the response of climate change to unbalanced global warming is affected by spatial and temporal *** better understand the regional warming response to global warming at 1.50℃and 2.00℃,we detected the 1.50℃and 2.00℃warming threshold-crossing time(WTT)above pre-industrial levels globally using the Coupled Model Intercomparison Project phase 6(CMIP6)*** findings indicate that the 1.50℃or 2.00℃WTT differs substantially *** warming rate of land would be approximately 1.35–1.46 times that of the ocean between 60°N–60°S in 2015–***,the land would experience a 1.50℃(2.00℃)warming at least 10–20 yr earlier than the time when the global mean near-surface air temperature reaches 1.50℃(2.00℃)***,the Southern Ocean between 0°and 60°S considerably slows down the global 1.50℃and 2.00℃*** 2040–2060,over 98.70%(77.50%),99.70%(89.30%),99.80%(93.40%),and 100.00%(98.00%)of the land will have warmed by over 1.50℃(2.00℃)under SSP(Shared Socioeconomic Pathway)1–2.6,SSP2-4.5,SSP3-7.0,and SSP5-8.5,*** conclude that regional 1.50℃(2.00℃)WTT should be fully considered,especially in vulnerable high-latitude and high-altitude regions.

关键词： CMIP6(Coupled Model Intercomparison Project phase 6) global warming 1.50℃warming time 2.00℃warming time regional differences

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Frictional contact analysis of a rigid solid with periodic surface sliding on the thermoelectric material

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Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 179-196页

作者： yali ZHANG Yueting ZHOU Shenghu DING School of Mathematics and Statistics Ningxia UniversityYinchuan 750021China School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China

Understanding and characterizing rough contact and wavy surfaces are essential for developing effective strategies to mitigate wear,optimize lubrication,and enhance the overall performance and durability of mechanical *** sliding friction contact problem between a thermoelectric(TE)half-plane and a rigid solid with a periodic wavy surface is the focus of this *** simplify the problem,we utilize mixed boundary conditions,leading to a set of singular integral equations(SIEs)with the Hilbert *** analytical solutions for the energy flux and electric current density are obtained by the variable transform method in the context of the electric and temperature *** contact problem for the elastic field is transformed into the second-kind SIE and solved by the Jacobi ***,the smoothness of the wavy contact surface ensures that there are no singularities in the surface contact stress,and ensures that it remains free at the contact *** on the plane strain theory of elasticity,the analysis primarily examines the correlation between the applied load and the effective contact *** distribution of the normal stress on the surface with or without TE loads is discussed in detail for various friction ***,the obtained results indicate that the in-plane stress decreases behind the trailing edge,while it increases ahead of the trailing edge when subjected to TE loads.

关键词： wavy surface periodic contact thermoelectric(TE)material Hilbert integral kernel

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Spatial-temporal Patterns of Urban Parks' Effects on the Sentiments and Their Associated Factors Based on Social Media Data——a Case Study in Beijing

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Journal of Geodesy and Geoinformation Science 2024年第2期 95-110页

作者： YUAN Yuting WANG Juan WEI yali ZHU Yanrong SHI Changsheng meng Bin College of Applied Arts and Science Beijing Union University Laboratory of Urban Cultural Sensing & Computing Beijing Union University Beijing Guohuan Environmental Technology Co. Ltd.

As the pivotal green space, urban parks play an important role in urban residents' daily activities. Thy can not only bring people physical health, but also can be more likely to elicit positive sentiment to those who visit ***, social media big data has provided new data sources for sentiment analysis. However, there was limited researches that explored the connection between urban parks and individual's sentiments. Therefore, this study firstly employed a pre-trained language model(BERT, Bidirectional Encoder Representations from Transformers)to calculate sentiment scores based on social media data. Secondly, this study analysed the relationship between urban parks and individual's sentiment from both spatial and temporal perspectives. Finally, by utilizing structural equation model(SEM), we identified 13 factors and analyzed its degree of the influence. The research findings are listed as below: 1 It confirmed that individuals generally experienced positive sentiment with high sentiment scores in the majority of urban parks; 2 The urban park type showed an influence on sentiment scores. In this study, higher sentiment scores observed in Eco-parks, comprehensive parks, and historical parks; 3 The urban parks level showed low impact on sentiment scores. With distinctions observed mainly at level-3 and level-4;4 Compared to internal factors in parks, the external infrastructure surround them exerted more significant impact on sentiment scores. For instance, number of bus and subway stations around urban parks led to higher sentiment scores, while scenic spots and restaurants had inverse result. This study provided a novel method to quantify the services of various urban parks, which can be served as inspiration for similar studies in other cities and countries, enhancing their park planning and management strategies.

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Towards robustness and generalization of point cloud representation:A geometry coding method and a large-scale object-level dataset

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Computational Visual Media 2024年第1期10卷 27-43页

作者： Mingye Xu Zhipeng Zhou yali Wang Yu Qiao Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518000China University of Chinese Academy of Sciences Beijing065001China Shanghai AI Laboratory Shanghai200001China SIAT Branch Shenzhen Institute of Artificial Intelligence and Robotics for SocietyShenzhen518000China Alibaba DAMO Academy Hangzhou242332China

Robustness and generalization are two challenging problems for learning point cloud *** tackle these problems,we first design a novel geometry coding model,which can effectively use an invariant eigengraph to group points with similar geometric information,even when such points are far from each *** also introduce a large-scale point cloud dataset,*** consists of 184 categories and 51,915 synthetic objects,which brings new challenges for point cloud classification,and provides a new benchmark to assess point cloud cross-domain ***,we perform extensive experiments on point cloud classification,using ModelNet40,ScanObjectNN,and our PCNet184,and segmentation,using ShapeNetPart and *** method achieves comparable performance to state-of-the-art methods on these datasets,for both supervised and unsupervised *** and our dataset are available at https://***/MingyeXu/PCNet184.

关键词： geometry coding self-supervised learning point cloud classification segmentation 3D analysis

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Layered Structural PBAT Composite Foams for Efficient Electromagnetic Interference Shielding

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Nano-Micro Letters 2024年第2期16卷 273-286页

作者： Jianming Yang Hu Wang yali Zhang Hexin Zhang Junwei Gu School of Chemistry and Chemical Engineering Anhui University of TechnologyMa’anshanAnhui 243032People’s Republic of China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiPeople’s Republic of China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuPeople’s Republic of China

The utilization of eco-friendly,lightweight,high-efficiency and high-absorbing electromagnetic interference(EMI)shielding composites is imperative in light of the worldwide promotion of sustainable *** this work,magnetic poly(butyleneadipate-coterephthalate)(PBAT)microspheres were firstly synthesized via phase separation method,then PBAT composite foams with layered structure was constructed through the supercritical carbon dioxide foaming and scraping *** merits of integrating ferroferric oxideloaded multi-walled carbon nanotubes(Fe3O4@MWCNTs)nanoparticles,a microcellular framework,and a highly conductive silver layer have been judiciously orchestrated within this distinctive layered *** are consumed throughout the process of“absorption-reflection-reabsorption”as much as possible,which greatly declines the secondary radiation *** biodegradable PBAT composite foams achieved an EMI shielding effectiveness of up to 68 dB and an absorptivity of 77%,and authenticated favorable stabilization after the tape adhesion experiment.

关键词： Electromagnetic interference shielding Layered structure Supercritical carbon dioxide foaming Poly(butyleneadipateco-terephthalate) Microcellular

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