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Hydrologic balance, net primary productivity and water use efficiency of the introduced exotic Eucalyptus grandis × Eucalyptus urophylla plantation in south-western China

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Journal of Plant Ecology 2019年第6期12卷 982-992页

作者： yanting hu Ping Zhao Yuqing huang Liwei Zhu Guangyan Ni Xiuhua Zhao Zhihong huang Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of Sciences723 Xingke RoadTianhe DistrictGuangzhou 510650China Guangdong Provincial Key Laboratory of Applied Botany South China Botanical GardenChinese Academy of Sciences723 Xingke RoadTianhe DistrictGuangzhou 510650China Key Laboratory of Beibu Gulf Environment Change and Resource Use Ministry of Education and Guangxi Key Laboratory of Earth Surface Processes and Intelligent SimulationNanning Normal University175 Mingxiu East RoadNanningGuangxi 530001China Department of Forest Ecology College of Life Science and TechnologyCentral South University of Forestry and Technology498 Shaoshan South RoadChangshaHunan 410004China

Aims Land cover changes can disrupt water balance and alter the partitioning of precipitation into surface runoff,evapotranspiration and groundwater *** widely planted Eucalyptus trees in south-western China have the potential to bring about hydrologic *** research aims to elucidate the hydrologic balance characteristics of the introduced exotic Eucalyptus grandis×Eucalyptus urophylla plantation and to assess whether its high productivity results from high water use efficiency(WUE)or large water *** A 400-m^(2) experimental plot was established in an ***×*** plantation in south-western *** balance components,including stand transpiration(T_(r)),evapotranspiration(E_(t))and runoff(R)were obtained as follows:T_(r) was estimated based on sap flow measurements,E_(t) was estimated as the average of surface transpiration and evaporation weighted by the fractional green vegetation cover using a modeling approach,and R was collected using the installed metal *** primary productivity(NPP)was obtained from allometric equation and annual diameter at breast height(DBH)increment *** Findings Annual E_(t) and T_(r) were 430±31 and 239±17 mm,*** T_(r) accounts for 56±8%of total evapotranspiration on ***(NPP/T_(r))of the ***×*** was estimated to be 3.3–3.9 mmol·mol^(−1).Based on the comparative analysis of T_(r) and WUE,***×*** had a high productivity due to its high WUE without exhibiting prodigal water *** factors including vapor pressure deficit and global solar radiation(R_(s))were key factors regulating E_(t) and T_(r) in our research *** surface runoff,E_(t) and canopy interception occupied 7%,27–30%and 16%of total precipitation,while the remaining 46–50%of precipitation was used for sustaining groundwater recharge and altering soil water *** higher runoff coefficient(7.1%)indicated the weaker capability of ***

关键词： water balance evapotranspiration water use efficiency sap flow runoff

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Water transport of native and exotic tree species in relation to xylem anatomical characteristics in low subtropical China

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Journal of Plant Ecology 2018年第3期11卷 423-433页

作者： yanting hu Jianguo Gao Ping Zhao Weijun Shen Peiqiang Zhao Liwei Zhu Guangyan Ni Junfeng Niu Lei Ouyang Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesXingke Road 723Tianhe DistrictGuangzhou 510650China University of Chinese Academy of Sciences Beijing 100049China Guangdong Provincial Key Laboratory of Applied Botany South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China

Aims Exotic fast-growing tree species have been commonly planted as pioneer species to facilitate ecological restoration in South *** growth and resource utilization behavior related to intrinsic physiology and structural properties have profound influences on forest ***,the contrastive research focusing on water utilization features along with xylem anatomical properties between native and exotic species is scarce in South *** objective of this study is to investigate the sapwood anatomical characteristics and water utilization conditions of native and exotic fast-growing species,and to elucidate the relationship between sap-flux density and conduit *** We measured sap-flux density,conduit length,diameter and density of four native species(Schima superba,Michelia mac-clurei,Castanopsis hystrix and Castanopsis fissa)and four exotic species(Eucalyptus citriodora,Eucalyptus urophylla×grandis,Acacia auriculaeformis and Acacia mangium).Sap flux density was measured based on the Granier’s thermal dissipation probe *** whole-tree water transport was quantified by mul-tiplying sap-flux density by sapwood *** measurements of conduit characteristics were conducted by using segregation and slice *** Findings Sapwood area increased with the growing diameter at breast height(DBH)as a power *** species had a larger water-conducting tissue area than exotic species at the same DBH value when trees grew to a size with a certain value of *** con-duit diameter of exotic species was significantly larger than that of native ***,native species,such as *** and ***,had longer conduit length and higher conduit den-sity than other tree *** on a physiological interpretation of the measured conduit characteristics,native tree species devel-oped a safe water transport system while exotic fast-growing tree species come into being an efficient system *** trans-port i

关键词： sap-flux density conduit characteristics sapwood area water transport

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Plant functional trait diversity and structural diversity co-underpin ecosystem multifunctionality in subtropical forests

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Forest Ecosystems 2023年第2期10卷 153-161页

作者： Shuai Ouyang Mengmeng Gou Pifeng Lei Yue Liu Liang Chen Xiangwen Deng Zhonghui Zhao Yelin Zeng yanting hu Changhui Peng Wenhua Xiang Faculty of Life Science and Technology Central South University of Forestry and TechnologyChangsha410004China huitong National Station for Scientific Observation and Research of Chinese Fir Plantation Ecosystems in hunan Province Huitong438107China Ecology and Nature Conservation Institute Chinese Academy of ForestryBeijing100101China Institute of Environment Sciences Department of Biological SciencesUniversity of Quebec at MontrealMontrealQCH3C 3P8Canada

Tree species diversity is assumed to be an important component in managing forest ecosystems because of effects on multiple functions or ecosystem ***,the importance of tree diversity in determining multifunctionality in structurally complex subtropical forests relative to other regulators(e.g.,soil microbial diversity,stand structure,and environmental conditions)remains *** this study,effects of aboveground(species richness and functional and structural diversity)and belowground(bacterial and fungal diversity)biodiversity,functional composition(community-weighted means of species traits),stand structure(diameter at breast height and stand density),and soil factors(pH and bulk density)on multifunctionality(including biomass production,carbon stock,and nutrient cycling)were examined along a tree diversity gradient in subtropical *** community-weighted mean of tree maximum height was the best predictor of ecosystem *** diversity explained a higher proportion of the variation in multifunctionality than that of species richness and fungal *** structure-played an important role in modulating the effects of tree diversity on *** work highlights that species composition and maximizing forest structural complexity are effective strategies to increase forest multifunctionality while also conserving biodiversity in the management of multifunctional forests under global environmental changes.

关键词： Abiotic and biotic factors Biodiversity Functional composition Functional traits Soil microbial diversity Stand structure

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Nutrient enrichment driven by canopy rainfall redistribution:Mechanism,quantification,and pattern

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Science China Earth Sciences 2024年第5期67卷 1529-1544页

作者： Chuan YUAN Xiaoping YUE Yafeng ZHANG Yu ZHANG yanting hu Qiang TANG Li GUO Shuai WANG Xingwu DUAN Wenhua XIANG Xiaohua WEI Xiaoyan LI College of Forestry and Biotechnology Zhejiang A&F UniversityHangzhou 311300China Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station School of Geographical SciencesSouthwest UniversityChongqing 400715China Shapotou Desert Research and Experiment Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Geographical Sciences Hebei Normal UniversityShijiazhuang 050024China Faculty of Life Science and Technology Central South University of Forestry and TechnologyChangsha 410004China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Yunnan Key Laboratory of Soil Erosion Prevention and Green Development Institute of International Rivers and Eco-securityYunnan UniversityKunming 650091China Department of Earth Environmental and Geographic SciencesUniversity of British Columbia(Okanagan)KelownaBritish Columbia V1V 1V7Canada

Vegetation canopies intercept and redistribute rainfall into throughfall and stemflow,which transfer substantial amounts of elements into the soil,influencing soil microbial community,plant survival,and plant community *** advancements in ecohydrological research,the implication of nutrient enrichment resulting from this redistribution of rainfall by canopies remains largely *** address this gap,we conducted a systematic review of 1020 papers published between 2000 and 2022,gathering data on nutrient concentration and enrichment for critical ions(including K^(+),Na^(+),Ca^(2+),Mg^(2+),NH_(4)^(+),Cl^(-),NO_(3)^(-)and SO_(4)^(2-))from the Web of Science and Chinese Knowledge Infrastructure *** aimed to synthesize the mechanisms,quantify the enrichments,and identify global patterns of nutrient enrichment in stemflow and throughfall across climate zones,and vegetation types and *** results of this study indicate that stemflow exhibits,on average,2.1times greater ion concentration(6.13 mg L^(-1))compared to *** particular,among the investigated ions,SO_(4)^(2-)(12.45and 6.32 mg L^(-1))for stemflow and throughfall,respectively,and Cl^(-)(9.21 and 4.81 mg L^(-1))exhibit the highest concentrations in both rainfall redistribution components,while K^(+)(13.7 and 5.8)and Mg^(2+)(5.6 and 2.8)have the highest enrichment *** climate zones,throughfall and stemflow show the lowest ion concentrations but the highest enrichment factors in extremely humid *** the temperature gradient,ion concentrations are the highest in cold climates with no clear patterns observed for enrichment factors with increasing *** addition,shrubs,conifers,mixed forests,and artificial ecosystems demonstrate enrichment factors 1.1 to 3.0 times greater than those of trees,broad-leaved plants,pure forests,and natural *** findings emphasize the need for increased attentions to artificial ecosystems,such as urban

关键词： Ecohydrology Rainfall redistribution Nutrients transport Enrichment characteristics Climate zones

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平庸的优秀:大学生量化评价中“分数至上”现象研究

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中国青年研究 2023年第12期 102-111页

作者：胡艳婷厦门大学教育研究院、教师发展中心

绩点制和学生素质综合测评是我国高校本科人才培养中普遍使用的学生评价方式。这种评价方式以“量化”为主要特征,通过数字结果呈现学生的学习成效与位次结构。在量化评价制度的裹挟之下,学生陷入“分数至上”的旋涡,争相追求“绩点优... 详细信息

绩点制和学生素质综合测评是我国高校本科人才培养中普遍使用的学生评价方式。这种评价方式以“量化”为主要特征,通过数字结果呈现学生的学习成效与位次结构。在量化评价制度的裹挟之下,学生陷入“分数至上”的旋涡,争相追求“绩点优秀”“综测优秀”等以数字为标识的优秀,成绩演变成资本化的教育符号,教育沦为就业升学的工具,催生了“平庸的优秀”。久而久之,“分数至上”引发“数字暴政”和“无效内卷”,学生自我意识迷失、创新缺失。超越“平庸的优秀”,需要从教育观念、教育制度、教育环境等各个维度作出改变。

关键词：平庸的优秀量化评价绩点制学生素质综合测评

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Management Models and Development Strategies of the Farmers’ Professional Cooperatives in the Western Poor Counties and Regions of China: A Case Study of Long’an County,Guangxi

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Asian Agricultural Research 2020年第3期12卷 6-9页

作者： yanting hu Yongxian LIU Dongmei WANG Liping PAN Jinping CHEN Zhilian FAN Guangxi University Nanning 530004China Institute of Agricultural Resources and Environment Guangxi Academy of Agricultural SciencesNanning 530007China Guangxi Rural Development Research Association Nanning 5300074China Nanning Institute of Agricultural Sciences Nanning 530021China

In the new era,an important task is how farmers’professional cooperatives to better adapt to new development environment and effectively solve the problems that"who will cultivate land"and"who does agriculture depend on"in the *** this paper,model and development direction of farmers’professional cooperatives in Long’an County of Guangxi are analyzed and studied based on realistic development background of Guangxi.

关键词： Farmers’professional cooperative Management model Healthy development

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Laser chirp controlled relativistic few-cycle mid-infrared pulse generation

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High Power Laser Science and Engineering 2023年第5期11卷 76-84页

作者： Dongao Li Guobo Zhang Jie Zhao yanting hu Yu Lu Hao Zhang Qianni Li Dongze Zhang Rong Sha Fuqiu Shao Zhengming Sheng Tongpu Yu Department of Physics National University of Defense TechnologyChangshaChina Department of Nuclear Science and Technology National University of Defense TechnologyChangshaChina Key Laboratory for Laser Plasmas(MOE)and School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghaiChina Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghaiChina Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghaiChina

Relativistic few-cycle mid-infrared(mid-IR)pulses are unique tools for strong-field physics and ultrafast science,but are difficult to generate with traditional nonlinear optical ***,we propose a scheme to generate such pulses with high efficiency via plasma-based frequency modulation with a negatively chirped laser pulse(NCLP).The NCLP is rapidly compressed longitudinally due to dispersion and plasma etching,and its central frequency is downshifted via photon deceleration due to the enhanced laser intensity and plasma density *** results show that few-cycle mid-IR pulses with the maximum center wavelength of 7.9µm and pulse intensity of a_(MIR)=2.9 can be generated under a proper chirp ***,the maximum energy conversion efficiency can approach 5.0%.Such a relativistic mid-IR source is promising for a wide range of applications.

关键词： chirp laser pulses laser wakefield photon deceleration relativistic mid-infrared generation

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专业匹配对高校毕业生工资起薪的影响--基于倾向得分匹配法的实证研究

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华东师范大学学报（教育科学版） 2021年第4期39卷 53-63页

作者：胡艳婷蒋承厦门大学马克思主义学院厦门361005 北京大学教育学院/教育经济研究所北京100871

高校毕业生就业与所学专业的匹配情况是影响就业质量的重要因素。基于2015年全国高校毕业生就业调查数据,本文考察了毕业生就业与所学专业的匹配情况,以及专业匹配对毕业生工资起薪的影响,并使用倾向得分匹配方法(PSM)对内生性问题进行... 详细信息

高校毕业生就业与所学专业的匹配情况是影响就业质量的重要因素。基于2015年全国高校毕业生就业调查数据,本文考察了毕业生就业与所学专业的匹配情况,以及专业匹配对毕业生工资起薪的影响,并使用倾向得分匹配方法(PSM)对内生性问题进行了纠正。研究发现:有56.1%的毕业生所学专业与工作匹配,有11.7%毫不相关;OLS方法得出专业匹配情况下的工资起薪比专业不匹配高3.4%,使用PSM方法得出专业匹配的工资效应为5%,传统的OLS模型低估了专业匹配的工资效应。进一步的研究显示,相较于“211工程”高校和高职高专院校,专业匹配对非“211工程”本科高校毕业生存在显著的收入效应;与专科和硕士以上学历的毕业生相比,专业匹配对本科学历毕业生具有显著的正向影响,专业匹配比专业不匹配工资高7%左右;经济学类毕业生专业匹配对工资起薪具有更加显著的正向影响,专业匹配比专业不匹配的起薪高15%左右。基于此,高校的专业学科结构设置和人才培养模式应该在专业匹配上做出更加精准的判断,以有效提高大学生的就业质量。

关键词：高校毕业生专业匹配就业起薪

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本土化:中国高等教育现代化的根基

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中国高教研究 2023年第6期 1-11页

作者：邬大光胡艳婷厦门大学教育研究院福建厦门361005 兰州大学高等教育研究院甘肃兰州730000 中国高等教育学会北京100191 厦门大学教育研究院/教师发展中心福建厦门361005

高等教育现代化是中国式现代化的重要组成部分,一个国家的高等教育现代化既应具备世界各国高等教育现代化的共性特征,更应基于国情构建具有本土特色的高等教育现代化体系。通过梳理“传统与现代”“本土化与国际化”两对概念的关系,提... 详细信息

高等教育现代化是中国式现代化的重要组成部分,一个国家的高等教育现代化既应具备世界各国高等教育现代化的共性特征,更应基于国情构建具有本土特色的高等教育现代化体系。通过梳理“传统与现代”“本土化与国际化”两对概念的关系,提出从本土化的视角重新认识现代化的命题,并分析了本土化的理论内涵和实践逻辑,总结了“早发内生型”国家和“后发外生型”国家高等教育发展特征的差异。前者的本土化举措是对自身高等教育系统的优化和升级,后者是基于本国国情对“舶来”的高等教育模式进行的改造和创新。我国作为“后发外生型”国家,为实现中国高等教育现代化,既需要学习西方高等教育经验,更需要扎根中国大地,通过“本土化”改造推进中国高等教育现代化。

关键词：高等教育本土化现代化中国式

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Efficient bright γ-ray vortex emission from a laser-illuminated light-fan-in-channel target

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High Power Laser Science and Engineering 2021年第3期9卷 68-78页

作者： Hao Zhang Jie Zhao yanting hu Qianni Li Yu Lu Yue Cao Debin Zou Zhengming Sheng Francesco Pegoraro Paul McKenna Fuqiu Shao Tongpu Yu Department of Physics National University of Defense TechnologyChangsha 410073China SUPA Department of PhysicsUniversity of StrathclydeGlasgow G40NGUK Collaborative Innovation Center of IFSA(CICIFSA) Key Laboratory for Laser Plasmas(MoE)and School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Tsung-Dao Lee Institute Shanghai 200240China Department of Physics Enrico Fermi University of Pisaand CNR/INOPisa 56122Italy

X/γ-rays have many potential applications in laboratory astrophysics and particle *** several methods have been proposed for generating electron,positron,and X/γ-photon beams with angular momentum(AM),the generation of ultra-intense brilliant γ-rays is still ***,we present an all-optical scheme to generate a high-energy γ-photon beam with large beam angular momentum(BAM),small divergence,and high *** the first stage,a circularly polarized laser pulse with intensity of 10^(22) W/cm^(2) irradiates a micro-channel target,drags out electrons from the channel wall,and accelerates them to high energies via the longitudinal electric *** the process,the laser transfers its spin angular momentum(SAM)to the electrons’orbital angular momentum(OAM).In the second stage,the drive pulse is reflected by the attached fan-foil and a vortex laser pulse is thus *** the third stage,the energetic electrons collide head-on with the reflected vortex pulse and transfer their AM to the γ-photons via nonlinear Compton ***-dimensional particle-in-cell simulations show that the peak brilliance of the γ-ray beam is∼10^(22) photons·s^(-1)·mm^(-2)·mrad^(-2) per 0.1% bandwidth at 1 MeV with a peak instantaneous power of 25 TW and averaged BAM of 10^(6)h/*** AM conversion efficiency from laser to the γ-photons is unprecedentedly 0.67%.

关键词： laser-plasma interaction γ-rays

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