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Spatio-temporal variation of soil CO_(2) concentration in Loess Area of northwestern Shanxi Province,China

Research in Cold and Arid Regions 2022年第3期14卷 196-211页

作者： tianjie Shao ZhiPing Xu LianKai Zhang RuoJin Wang JunJie Niu MingYu Shao College of Geography Science and Tourism Shaanxi Normal UniversityXi'anShaanxi 710062China Institute of Karst Geology Chinese Academy of Geological SciencesGuilinGuangxi 541000China Research Center for Scientific Development in Fenhe River Basin Taiyuan Normal UniversityTaiyuanShanxi 030001China SNNU-JSU Joint Research Center for Nano-environment Science and Health Shaanxi Normal UniversityXi'anShaanxi 710062China

CO_(2) released by soil serves as an important link between terrestrial ecosystems and atmospheric CO_(2), whose small chang‐es may significantly affect the global carbon cycle. In order to reveal the spatio-temporal variations of CO_(2) concentrations in deep loess, this paper takes Qingliangsi Gully watershed in northwestern Shanxi Province, China as an example to sys‐tematically study soil CO_(2)concentration and its spatio-temporal variations and carbon sink significance under different watershed locations and different land use types. Results show that: (1) The release potential of the loess soil is larger in the depth range of 2 m, which is much more likely to be the CO_(2) release area. (2) Grassland and forest are more advanta‐geous in terms of soil microbial activity and soil carbon reserve compared with farmland. In addition, the change of land use type from farmland to grassland can increase soil organic carbon reserve, which is of far-reaching significance to the global carbon cycle. This is especially true in an area like the Loess Plateau with densely covered hills, gullies, and serious soil erosion in an area of 64×104 km2. (3) In the study area, the diurnal concentration of soil CO_(2) at different depths shows a weak "high-low-high-low" trend from 08:00 to 07:00 next day;and in deep soil it has a lag time compared with the daily change of temperature, generally about 4−12 h, which may be caused largely by the more compact loess structure. It is worth pointing out that the Loess Plateau in China, with a thickness of the loess of tens to hundreds of meters, has the most abundant soil resources in the world, and also stores a large amount of terrestrial soil carbon, which carries the hope of promoting the research of global carbon cycle.

关键词： soil CO_(2)concentration China Loess Plateau carbon sink function release potential

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Mechanistic insights into the adsorption and bioactivity of fibronectin on surfaces with varying chemistries by a combination of experimental strategies and molecular simulations

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Bioactive Materials 2021年第10期6卷 3125-3135页

作者： Lijing Hao tianjie Li Lin Wang Xuetao Shi Yan Fan Chang Du Yingjun Wang School of Materials Science and Engineering South China University of TechnologyGuangzhou510640China Department of Physics The Chinese University of Hong KongShatinN.T.Hong Kong National Engineering Research Center for Tissue Restoration and Reconstruction Guangzhou510006China Key Laboratory of Biomedical Engineering of Guangdong Province Guangzhou510006China Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education Guangzhou510006China Innovation Center for Tissue Restoration and Reconstruction Guangzhou510006China Bioland Laboratory(Guangzhou Regenerative Medicine and Health Guangdong Laboratory) Guangzhou510005China

Fibronectin(Fn)is significant to the performance of biomaterials,and the chemistry of biomaterial surface play important roles in Fn adsorption and subsequent cell ***,the“molecular scale”mechanism is still ***,we combined experimental strategies with molecular simulations to solve this *** prepared self-assembled monolayers with varying chemistries,i.e.,SAMs-CH3,SAMs-NH2,SAMs-COOH and SAMs-OH,and characterized Fn adsorption and cell behaviors on ***,Monte Carlo method and all-atom molecular dynamics simulations were employed to reveal the orientation/conformation of Fn on *** found that SAMs-CH3 strongly adsorbed Fn via hydrophobic interactions,but show poor bioactivity as the low exposure of RGD/PHSRN motifs and the deformation of ***-NH2 and SAMs-COOH could adsorb Fn efficiently via vdW interactions,electrostatic interactions,hydrogen bonds and salt *** exhibited excellent bioactivity for cell adhesion,proliferation and osteogenic differentiation as high exposure of bioactive motifs on SAMs-NH2,or as the activation of other inferior cell-binding motifs on ***-OH showed poor Fn adsorption as the water ***,the adsorbed Fn displayed non-negligible bioactivity due to high exposure of PHSRN motif and large degree of protein *** believe that the revealed mechanism presents great potential to rationally design Fn-activating biomaterials.

关键词： Fibronectin Self-assembled hBMSCs Molecular dynamics simulation Orientation

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梨树枝条粉碎覆盖对梨园土壤养分和微生物组的影响

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土壤学报 2024年第2期61卷 549-561页

作者：杨天杰王孝芳胡红菊杨健藕继旺王晓祥郝宝锋王中华董彩霞徐阳春南京农业大学资源与环境科学学院/江苏省固体有机废弃物资源化高技术研究重点实验室/江苏省有机固体废弃物资源化协同创新中心/资源节约型肥料教育部工程研究中心/国家有机类肥料工程技术研究中心南京210095 湖北省农业科学院果树茶叶研究所武汉430209 中国农业科学院郑州果树研究所郑州450009 贵阳小河区金海农业科技开发有限公司贵阳550000 黑龙江省农业科学院园艺分院哈尔滨150069 河北省农林科学院昌黎果树研究所河北昌黎066600 江苏省农业科学院果树研究所/江苏省高效园艺作物遗传改良重点实验室南京210014

梨树整形修剪枝条是一类重要的生物质资源,将其粉碎后覆盖于树下土壤是资源化利用的有效途径。为了科学评估梨树枝条粉碎覆盖对土壤理化性状及微生物群落结构的影响,采集了贵州毕节、河北昌黎、黑龙江哈尔滨、湖北枝江和河南许昌5个不... 详细信息

梨树整形修剪枝条是一类重要的生物质资源,将其粉碎后覆盖于树下土壤是资源化利用的有效途径。为了科学评估梨树枝条粉碎覆盖对土壤理化性状及微生物群落结构的影响,采集了贵州毕节、河北昌黎、黑龙江哈尔滨、湖北枝江和河南许昌5个不同纬度梨典型种植区梨园枝条覆盖1~2年后的土壤样品,检测了土壤基础理化特性及土壤细菌、真菌和原生生物群落。结果发现,与不覆盖枝条的对照相比,总体而言覆盖能有效提高土壤有机质和有效磷含量,土壤细菌、真菌和原生生物群落结构也发生了显著变化,但对群落多样性无显著影响;覆盖处理显著富集了土壤细菌中的变形菌门、酸杆菌门和真菌中的担子菌门以及原生生物中的孔虫界和囊泡虫类等类群的相对丰度。进一步利用随机森林模型挖掘了不同采样点枝条覆盖后的关键物种,模型预测准确率高达94.44%,关键物种以细菌为主,包括Acidibacter、Xanthobacteraceae、Nitrosomonadaceae等与有机残体降解有关的微生物,还发现土壤有效磷含量是土壤微生物群落结构差异的主要驱动因子。相关研究结果初步评估了梨树枝条覆盖对土壤养分和微生物组的影响,挖掘了潜在的关键微生物。

关键词：梨修剪枝条覆盖土壤理化性状微生物组关键物种

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Unmanned aerial systems coordinate target allocation based on wolf behaviors

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Science China(Information Sciences) 2019年第1期62卷 205-207页

作者： Haibin DUAN Qing YANG Yimin DENG Pei LI Huaxin QIU tianjie ZHANG Daifeng ZHANG Mengzhen HUO Yankai SHEN Bio-inspired Autonomous Flight Systems (BAFS) Research Group State Key Laboratory of Virtual Reality Technology and SystemsSchool of Automation Science and Electrical EngineeringBeihang University (BUAA)

Unmanned aerial systems (UASs), especially the cluster of UAS, are highly focused and widely used in various domains. The application of small and inexpensive UAS with a large-scale group to perform complex tasks has ... 详细信息

关键词： UAS Unmanned aerial systems coordinate target allocation based on wolf behaviors

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Major Modes of Short-Term Climate Variability in the Newly Developed NUIST Earth System Model(NESM)

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Advances in Atmospheric Sciences 2015年第5期32卷 585-600页

作者： CAO Jian Bin WANG Baoqiang XIANG Juan LI WU tianjie Xiouhua FU WU Liguang MIN Jinzhong Earth System Modeling Center Nanjing University of Information Science and Technology Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology International Pacific Research Center University of Hawaii at Manoa Department of Atmospheric Sciences University of Hawaii at Manoa NOAA/Geophysical Fluid Dynamics Laboratory Princeton NJ 08540 University Corporation for Atmospheric Research Boulder CO 80307 USA

A coupled earth system model（ESM） has been developed at the Nanjing University of Information Science and Technology（NUIST） by using version 5.3 of the European Centre Hamburg Model（ECHAM）, version 3.4 of the Nucleus for European Modelling of the Ocean（NEMO）, and version 4.1 of the Los Alamos sea ice model（CICE）. The model is referred to as NUIST ESM1（NESM1）. Comprehensive and quantitative metrics are used to assess the model＇s major modes of climate variability most relevant to subseasonal-to-interannual climate prediction. The model＇s assessment is placed in a multi-model framework. The model yields a realistic annual mean and annual cycle of equatorial SST, and a reasonably realistic precipitation climatology, but has difficulty in capturing the spring–fall asymmetry and monsoon precipitation domains. The ENSO mode is reproduced well with respect to its spatial structure, power spectrum, phase locking to the annual cycle, and spatial structures of the central Pacific（CP）-ENSO and eastern Pacific（EP）-ENSO; however, the equatorial SST variability,biennial component of ENSO, and the amplitude of CP-ENSO are overestimated. The model captures realistic intraseasonal variability patterns, the vertical-zonal structures of the first two leading predictable modes of Madden–Julian Oscillation（MJO）, and its eastward propagation; but the simulated MJO speed is significantly slower than observed. Compared with the T42 version, the high resolution version（T159） demonstrates improved simulation with respect to the climatology, interannual variance, monsoon–ENSO lead–lag correlation, spatial structures of the leading mode of the Asian–Australian monsoon rainfall variability, and the eastward propagation of the MJO.

关键词： coupled climate model earth system model climate variability

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自适应网络演化视角下公共设施服务半径测算方法——以东莞市小学为例

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时空信息学报 2024年第3期31卷 419-430页

作者：曾星黄滢冰徐文丽刘文凯陶田洁东莞市城建规划设计院东莞523000 东莞市自然资源技术中心东莞523000 华南师范大学北斗研究院佛山528225

城市公共服务设施的服务半径直接影响着居民生活的便利程度。目前研究将城市视为均质空间,对初始阈值设置依赖较高,且忽略了其空间复杂性及人口分布情况。因此,本文结合新城市科学思想提出自适应网络演化视角下的设施服务半径测算方法,... 详细信息

城市公共服务设施的服务半径直接影响着居民生活的便利程度。目前研究将城市视为均质空间,对初始阈值设置依赖较高,且忽略了其空间复杂性及人口分布情况。因此,本文结合新城市科学思想提出自适应网络演化视角下的设施服务半径测算方法,通过模拟人与设施交互关系,揭示微观基本单元到宏观统计规律的涌现机制;以东莞市小学为研究对象,探索基于供需总量平衡条件下的小学服务半径和学校规模适宜尺度,为城市规划中公共服务设施的合理配置提供路径方法建议。结果表明:①东莞市小学的实际平均服务半径为960 m,大于500 m的国家标准和800 m的地方规范要求;②不同主导功能区的设施服务半径存在较为明显的差异,产业区的小学服务半径相比居住主导型地区的大200 m;③不同规制学校的用地效率不同,54班制小学可作为土地资源紧约束地区的推荐值;④设施配置标准应结合城市或区域的功能分区、人口特征和发展阶段进行动态评估优化,来提升公共服务设施供给与社会需求的匹配度。

关键词：自适应网络模型服务半径城市小学空间分析选择概率法空间划分

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NIGT1 represses plant growth and mitigates phosphate starvation signaling to balance the growth response tradeoff in rice

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Journal of Integrative Plant Biology 2023年第8期65卷 1874-1889页

作者： Yuxin Zhang Qianqian Zhang Meina Guo Xueqing Wang tianjie Li Qingyu Wu Lihui Li Keke Yi Wenyuan Ruan National Key Facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Sciences Beijing 100081China State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China/Key Laboratory of Plant Nutrition and Fertilizer Ministry of AgricultureInstitute of Agricultural Resources and Regional PlanningBeijing 100081China National Engineering Research Center of Tree Breeding and Ecological Restoration College of Biological Sciences and TechnologyBeijing 100083China

Inorganic phosphate(Pi)availability is an important factor which affects the growth and yield of crops,thus an appropriate and effective response to Pi fluctuation is ***,how crops orchestrate Pi signaling and growth under Pi starvation conditions to optimize the growth defense tradeoff remains *** we show that a Pi starvationinduced transcription factor NIGT1(NITRATE-INDUCIBLE GARP-TYPE TRANSCRIPTIONAL REPRESSOR 1)controls plant growth and prevents a hyper-response to Pi starvation by directly repressing the expression of growth-related and Pisignaling genes to achieve a balance between growth and response under a varying Pi ***1 directly binds to the promoters of Pi starvation signaling marker genes,like IPS1,mi R827,and SPX2,under Pi-deficient conditions to mitigate the Pi-starvation responsive(PSR).It also directly represses the expression of vacuolar Pi efflux transporter genes VPE1/2 to regulate plant Pi *** further demonstrate that NIGT1 constrains shoot growth by repressing the expression of growth-related regulatory genes,including brassinolide signal transduction master regulator BZR1,cell division regulator CYCB1;1,and DNA replication regulator *** findings reveal the function of NIGT1 in orchestrating plant growth and Pi starvation signaling,and also provide evidence that NIGT1 acts as a safeguard to avoid hyper-response during Pi starvation stress in rice.

关键词： NIGT1 phosphate(Pi) PHRs Pi-starvation responsive(PSR) Pi starvation Pi signaling

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Remote sensing experiments for earth system science

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International Journal of Digital Earth 2021年第10期14卷 1237-1242页

作者： tianjie Zhao Michael H.Cosh Alexandre Roy Xihan Mu Yubao Qiu Jiancheng Shi Aerospace Information Research Institute Chinese Academy of SciencesBeijingPeople’s Republic of China USDA-Agricultural Research Service Beltsville Agricultural Research CenterHydrology and Remote Sensing LaboratoryBeltsvilleMDUSA Universitédu QuébecàTrois-Rivières QuébecCanada Faculty of Geographical Science Beijing Normal UniversityBeijingPeople’s Republic of China National Space Science Center Chinese Academy of SciencesBeijingPeople’s Republic of China

The Earth system is an integrated system that can be divided into six main subsystems:geosphere,atmosphere,hydrosphere,cryosphere,biosphere,and *** subsystems are interconnected through the flows of global energy,water,and carbon,which are fundamental constituent cycles within the Earth *** improve our predictive understanding of the subsystem on our changing planet,there is a need to better represent these subsystems through modelling and *** central role of these fundamental cycles has prompted scientific institutions or meteorological centers to develop digital platforms dedicated to the integration,modelling,and assimilation of Earth observation data,e.g.,Big Earth Data Science Engineering(Guo,Li,and Qiu 2020).

关键词： system earth prompt

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断桥铝合金门窗防渗漏构造技术研究与应用

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建设科技 2024年第3期 45-47,51页

作者：宋延涛石海明蒋利利武天杰北京城建北方众邦装饰工程有限公司北京101399

断桥隔热铝合金窗与传统的塑钢门窗、铝塑门窗相比具有良好的隔热性能和防风性能,在建筑行业的应用非常广泛。但仍存在框梃密封不严、排水阀倒灌、框扇组角位置开裂、窗扇角部胶条老化等问题,极易引发渗漏风险。本技术针对断桥铝合金门... 详细信息

断桥隔热铝合金窗与传统的塑钢门窗、铝塑门窗相比具有良好的隔热性能和防风性能,在建筑行业的应用非常广泛。但仍存在框梃密封不严、排水阀倒灌、框扇组角位置开裂、窗扇角部胶条老化等问题,极易引发渗漏风险。本技术针对断桥铝合金门窗密封工艺、窗框组合部位优化以及创新应用地漏式排水阀,有效改善门窗渗漏问题,具有一定推广价值。

关键词：高性能系统窗防渗漏注胶工艺

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An Exploration on the Implementation of Traditional Village Conservation with Enterprise Involvement: A Case Study of Xijingyu Village, Jixian County, Tianjin

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China City Planning Review 2018年第4期27卷 42-48页

作者： Zhang tianjie Zhang Lu Yue Yang Qian Fang School of Architec-ture Tianjin University Academic Committee of Urban Planning History and Theory Urban Planning Society of China School of Architecture Tsinghua University School of Architecture Tianjin University

In contemporary China, considerable traditional villages have either suffered from "developmental and constructive" damage, or have gradually declined due to conservation constraints. Under the current rural revitalization wave initiated by the Central Government, products, capitals, enterprises, and urban elites have entered the countryside. The actors of conserving and revitalizing traditional villages become multiple, which include local governments, enterprises, planners, village planning committees, and villagers. The paper takes Xijingyu Village in Jixian County, Tianjin as a specific case, and investigates the new mode of multiple participation in conservation and revitalization. Based on empirical data, it identifies the main problems regarding agriculture, the rural environment, and peasants, and reveals how to coordinate the roles of local government, village committee, villagers, enterprises, and other actors.

关键词： conservation and revitalization of traditional villages planning implementation multiple actors participation Xijingyu Village

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