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地表城市热岛时空演变——对夏季热浪时期的关注

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Journal of Geographical Sciences 2024年第6期34卷 1065-1082页

作者：任嘉义杨俊于文博丛楠肖向明夏建红李雪铭 School of Humanities and Law Northeastern UniversityShenyang 110169China Human Settlements Research Center Liaoning Normal UniversityDalian 116029LiaoningChina Jangho Architecture College Northeastern UniversityShenyang 110169China Lhasa Plateau Ecosystem Research Station Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Department of Microbiology and Plant Biology Center for Earth Observation and ModelingUniversity of OklahomaNormanOK 73019USA School of Earth and Planetary Sciences(EPS) Curtin UniversityPerth 65630Australia

Many cities face heat wave(HW) events, combined with the existent surface urban heat island(SUHI) effects. This places pressure on human settlements and sustainable development. However, few studies have investigated the SUHI effects from the perspective of HWs. In this study, the summer HWs in Beijing from 2001 to 2021 were calculated, and the evolution of HWs and SUHIs was quantitatively analyzed based on the dynamic nature of the urban-rural boundary. Beijing experienced 27 HWs in the 21 years, including 10 instances in June, four in July, and 13 in August. The SUHI varied during HWs, between 2–3℃ in most years. The highest SUHI occurred in 2019, reaching 3.99℃ and covering the largest area(10,887 km^(2)). The fluctuation in HWs and SUHIs generally displayed the same spatiotemporal pattern, and HWs amplified the SUHIs to a certain extent, with the highest correlation coefficient being 0.44. Additionally, impervious surfaces and cropland contributed most to SUHIs,and night light enhanced SUHIs. Observing the co-evolution of HWs and SUHIs will be helpful for ecological maintenance and urban infrastructure optimization and provide theoretical support for reducing heat risk and improving the human settlement environment.

关键词： heat wave surface urban heat island interactive Self-organization algorithm centroid migration Beijing

通心络胶囊治疗急性缺血性脑卒中疗效和安全性的Meta分析

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中国处方药 2024年第7期22卷 26-30页

作者：丛伶男查鹏烟台市蓬莱中医医院山东烟台265600

目的系统评价通心络胶囊用于急性缺血性卒中的疗效及安全性。方法系统检索PubMed、知网、维普、万方数据库,并根据纳入/排除标准对文献进行筛选。两位作者独立对纳入文献进行资料提取并核对。使用RevMan 5.3软件对结局数据进行合并分析... 详细信息

目的系统评价通心络胶囊用于急性缺血性卒中的疗效及安全性。方法系统检索PubMed、知网、维普、万方数据库,并根据纳入/排除标准对文献进行筛选。两位作者独立对纳入文献进行资料提取并核对。使用RevMan 5.3软件对结局数据进行合并分析。结果共纳入14项随机对照试验,涉及3341例受试者。Meta分析显示,在常规疗法基础上联合使用通心络胶囊,在改善神经功能缺损包括降低缺损程度评分[MD=-3.98,95%CI(-4.53,-3.42)]及提高神经功能改善率[RR=1.24,95%CI(1.19,1.30)]、提高生活能力[MD=4.20,95%CI(3.62,4.78)]、降低美国国立卫生研究院卒中量表(NIHSS)评分[MD=-3.83,95%CI(-4.50,-3.16)]上,均优于单用常规疗法;不良事件发生率[RR=0.94,95%CI(0.69,1.28)],组间比较差异无统计学意义(P=0.67)。结论通心络胶囊用于急性缺血性卒中,在改善神经功能缺损、提高生活能力、降低卒中NIHSS评分方面可增强疗效,且较安全。

关键词：通心络胶囊卒中疗效安全性 Meta分析

Spatial variations in responses of vegetation autumn phenology to climate change on the tibetan Plateau

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Journal of Plant Ecology 2017年第5期10卷 744-752页

作者： nan cong Miaogen Shen Shilong Piao Key Laboratory of Alpine Ecology and Biodiversity Institute of Tibetan Plateau ResearchChinese Academy of Sciences16 Lincui RoadBeijing 100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences 16 Lincui RoadBeijing 100101China

Aims Information about changes in the start and end of the vegetation growing season(SOS and EOS)is crucial for assessing ecosystem responses to climate change because of the high sensitivity of both to climate and their extensive influence on ecological processes in temperate and cold *** warming substantially advanced SOS on the tibetan Plateau from 1982 to ***,it is unclear why EOS showed little delay despite increasing tem-perature over this *** We used multiple methods to determine EOS from the satellite-observed normalized-difference vegetation index and investigated the relationships between EOS and its potential drivers on the tibetan Plateau over *** findings We found a slight but non-significant delay in regionally averaged EOS of 0.7 day decade−1(P=0.18)and a widespread but weak delaying trend across the Plateau over this *** inter-annual variations in regionally averaged EOS were driven mainly by pre-season temperature(partial R=0.62,P0.10).Pre-season warming delayed EOS mainly in the eastern half and north-western area of the *** the south-west,EOS was significantly and positively related to SOS,suggesting potentially indirect effects of winter weather conditions on the following autumn’s phenology through regulation of spring *** was more strongly related with pre-season temperature in colder and wetter areas,reflecting vegetation adaptation to local ***,pre-season temperature had weaker delaying effects on EOS for vegeta-tion with a shorter growing season,for which SOS had a stronger control on inter-annual variations in EOS than for vegetation with a longer growing *** indicates that shorter-season tibetan Plateau vegetation may have lower plasticity in adjusting the length of its growing season,whenever it begins,and that climate change is more likely to shift the growing season than e

关键词： climate change vegetation phenology temperature end of growing season remote sensing tibetan Plateau

基于Landsat 8影像提取豫中地区冬小麦和夏玉米分布信息的最佳时相选择

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作物学报 2024年第3期50卷 721-733页

作者：赵荣荣丛楠赵闯中国科学院地理科学与资源研究所拉萨高原生态试验站北京100101 中国农业大学资源与环境学院北京100193

遥感技术对大尺度农业实时监测提供了一个理想的手段,遥感影像植被分类的最佳时相对作物种植面积遥感监测非常重要。本文选取2020年至2021年的6景Landsat 8影像,覆盖了夏玉米从乳熟到收获、冬小麦从越冬到成熟的生育期,以此分析不同时... 详细信息

遥感技术对大尺度农业实时监测提供了一个理想的手段,遥感影像植被分类的最佳时相对作物种植面积遥感监测非常重要。本文选取2020年至2021年的6景Landsat 8影像,覆盖了夏玉米从乳熟到收获、冬小麦从越冬到成熟的生育期,以此分析不同时相的冬小麦-夏玉米与其他地类在光谱特征和NDVI上的差异,通过决策树的方法提取豫中地区冬小麦-夏玉米的空间分布情况。结果表明,冬小麦-夏玉米在不同生长发育时期,提取到的面积比有所不同,对于夏玉米而言,乳熟时期的提取效果要优于之后的时期,其在2020年8月26日的总体精度最高,为83.60%,Kappa系数为0.72,分类质量很好;对于冬小麦而言,最佳识别时期则处于冬小麦的越冬期,其在2021年1月1日的总体精度最高,为92.36%,Kappa系数为0.81,信息提取效果很好。除了作物自身生长过程的覆盖度变化,分类精度随成像时间而改变。多时相信息提取也发现,受到天气等环境条件限制,夏玉米和冬小麦的种植区域不完全重叠,山区冬季不适合冬小麦种植从而没有与夏玉米出现重叠分布。本研究有助于我们从宏观上对作物分布及生长状况作出及时有效的判断,对农业监测,特别是对轮作农田的信息管理和作物物候、种植面积等研究具有广阔的应用前景。

关键词：冬小麦-夏玉米光谱特征决策树分类分类精度 Landsat 8-OLI遥感影像

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Spatial sampling inconsistency leads to differences in phenological sensitivity to warming between natural and experiment sites

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Science Bulletin 2019年第14期64卷 961-963页

作者： nan cong Miaogen Shen Jiaxing Zu Yangjian Zhang Lhasa Plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Key Laboratory of Alpine Ecology and Biodiversity Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100190 China

Plant spring phenology is receiving increasing attention owing to the recognition of its high sensitivity to ongoing climatic warming [1]. Changes in plant spring phenology can substantially influence a wide range of ecosystem structure and functions, which can not only affect human-beings but also in turn affect climate [2]. Warming experiments have been widely conducted to help understand, and thus predict plant phenological response to climate. Most of these experiment-based studies have focused on reporting the signs and magn让udes of phenological responses, and a few have included temperature sensitivity (phenological shifts per unit temperature change). However, applying the outputs of these experiments to predict future phenological response to climate change remains challenging.

关键词： differences phenological sensitivity experiment sites

Multimodel projections and uncertainties of net ecosystem production in China over the twenty-first century

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Chinese Science Bulletin 2014年第34期59卷 4681-4691页

作者： Tao Wang Xin Lin Shushi Peng nan cong Shilong Piao Laboratory for Glaciology and Environmental Geophysics CNRS/Joseph Fourier-Grenoble University 38402 GrenobleFrance Laboratory for Climate and Environmental Science CEA CNRS UVSQ 91191 Gif-sur-Yvette France State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences College of Water Sciences Beijing Normal University Sino-French Institute for Earth System Science College of Urban and Environmental Sciences Peking University

Ecosystems in China have been absorbing anthropogenic CO2 over the last three decades. Here, we assess future carbon uptake in China using models from phase 5 of Coupled Model Intercomparison Project under four socio-economic scenarios. The average of China's carbon sink from 2006 to 2100 represented by multimodel mean net ecosystem production(NEP) is projected to increase(relative to averaged NEP from 1976 to 2005) in the range of 0.137 and 0.891 Pg C a-1across differentscenarios. Increases in NEP are driven by increases in net primary production exceeding increases in heterotrophic respiration, and future carbon sink is mainly attributed to areas located in eastern China. However, there exists a considerable model spread in the magnitude of carbon sink and model spread tends to be larger when future climate change becomes more intense. The model spread may result from intermodel discrepancy in the magnitude of CO2 fertilization effect on photosynthesis, soil carbon turnover time, presence of carbon-nitrogen cycle and interpretation of land-use changes. For better quantifying future carbon cycle, a research priority toward improving model representation of these processes is recommended.

关键词：中国东部地区生态系统生产量不确定性模式预测二氧化碳使用模型净初级生产力

Acoustic signal dominance in the multimodal communication of a nocturnal mammal

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Current Zoology 2022年第5期68卷 592-599页

作者： Chun-Mian Zhang cong-nan Sun Jeffrey R Lucas Jiang Feng Ting-Lei Jiang Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization Northeast Normal University2555 Jingyue StreetChangchun 130117China Key Laboratory of Vegetation Ecology of Education Ministry Institute of Grassland ScienceNortheast Normal University2555 Jingyue StreetChangchun 130117China Department of Biological Sciences Purdue UniversityWest LafayetteIN 47907USA College of Life Science Jilin Agricultural University2888 Xincheng StreetChangchun 130118China

Multimodal communication in animals is common,and is particularly well studied in signals that include both visual and auditory *** signals that combine acoustic and olfactory components are less well *** communication plays a crucial role in agonistic interactions in many mammals,but relatively little is known about this type of communication in nocturnal ***,we used male Great Himalayan leaf-nosed bats Hipposideros armiger to investigate multimodal signal function in acoustic and olfactory aggressive *** monitored the physiological responses(heart rate[HR])when *** was presented with 1 of 3 stimuli:territorial calls,forehead gland odors,and bimodal signals(calls+odors).Results showed that *** rapidly increased their HR when exposed to any of the 3 ***,the duration of elevated HR and magnitude of change in HR increased significantly more when acoustic stimuli were presented alone compared with the presentation of olfactory stimuli *** contrast,the duration of elevated HR and magnitude of change in HR were significantly higher with bimodal stimuli than with olfactory stimuli alone,but no significant differences were found between the HR response to acoustic and bimodal *** previous work showed that acoustic and chemical signals provided different types of information;here we describe experiments investigating the responses to those *** results suggest that olfactory and acoustic signals are non-redundant signal components,and that the acoustic component is the dominant modality in male ***,at least as it related to *** study provides the first evidence that acoustic signals dominate over olfactory signals during agonistic interactions in a nocturnal mammal.

关键词： acoustic agonistic interactions heart rate Hipposideros armiger multimodal communication olfaction

OFDI逆向技术溢出与母国产业结构升级——基于门槛模型的实证研究

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江南大学学报（人文社会科学版） 2024年第1期23卷 102-116页

作者：杨秀云张奇高拴平从振楠厦门工学院商学院福建厦门361021 西安交通大学经济与金融学院陕西西安710061

文章选取2008—2019年31个省(市)面板数据,基于产业结构高级化和产业结构合理化两个维度,利用固定效应模型研究了OFDI逆向技术溢出对中国产业结构升级的促进作用,并以制度质量、科技创新水平和经济规模为门槛变量,分析其在OFDI逆向技术... 详细信息

文章选取2008—2019年31个省(市)面板数据,基于产业结构高级化和产业结构合理化两个维度,利用固定效应模型研究了OFDI逆向技术溢出对中国产业结构升级的促进作用,并以制度质量、科技创新水平和经济规模为门槛变量,分析其在OFDI逆向技术溢出促进母国产业结构升级过程中的门槛效应。实证结果表明:(1)OFDI逆向技术溢出能够有效地促进中国整体产业结构高级化,但对中国整体产业结构合理化的促进作用较为一般;(2)制度质量、科技创新水平和经济规模在OFDI逆向技术溢出促进产业结构升级的过程中均存在门槛效应,且在相关指标超过门槛值后,OFDI逆向技术溢出对产业结构高级化的促进作用得到明显增强;(3)OFDI逆向技术溢出效应还存在区域异质性,体现为东部地区的促进作用更为显著。

关键词： OFDI逆向技术溢出产业结构升级门槛效应

Impacts of snow cover duration on vegetation spring phenology over the Tibetan Plateau

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Journal of Plant Ecology 2019年第3期12卷 583-592页

作者： Ke Huang Jiaxing Zu Yangjian Zhang nan cong Yaojie Liu Ning Chen Lhasa Plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100190China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China

Aims Snow cover occupies large percentage of land surface in Tibetan *** cover duration(SCD)during non-growing seasons plays a critical role in regulating alpine vegetation’s phenology by affecting the energy budgets of land surface and soil moisture *** period’s snow cover during non-growing season may have distinct effect on the vegetation’s *** of season(SOS)has been observed advanced under the ongoing cli-mate change in the plateau,but it still remains unclear how the SCD alters the *** study attempts to answer the following questions:(i)What is the pattern of spatial and temporal variations for SCD and grassland SOS?(ii)Which period’s SCD plays a critical role in grassland’s SOS?Methods The remote sensing datasets from the Moderate Resolution Imaging Spectroradiometer(MODIS)were utilized to compute the SOS and SCD on the Tibetan Plateau over *** Asymmetric Gaussian function was applied to extract *** also explored the spatial pattern and temporal variation of SOS and ***,by using linear correlation coefficients,we investigated the driving effects of different period’s non-growing season SCD on *** Findings The non-growing season SCD slightly decreased during 2003-2015,while SOS exhibited an overall advancing *** trends in SOS were observed in the eastern plateau,and the delayed trends were mainly founded in western *** cover area exhibited two separate peaks during autumn and late winter over the *** SCD regions mainly distributed in middle-east of the plateau,while shrunken SCD distributed in other regions of the *** of different seasons caused distinct effects on vegetation *** autumn SCD advanced SOS over the eastern *** slightly lengthened SCD postponed SOS over the western *** the wet meadow regions,advanced SOS was positively associated with SCD during the entire non-growing season,whereas for the dry steppe,SCD over t

关键词： snow cover duration start of season remote sensing Tibetan Plateau