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Changes in soil microbial biomass and community structure with addition of contrasting types of plant litter in a semiarid grassland ecosystem

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Journal of Plant Ecology 2010年第3期3卷 209-217页

作者： hongmei jin Osbert Jianxin Sun Jianfeng Liu MOE Key Laboratory for Silviculture and Conservation and Institute of Forestry and Climate Change Research Beijing Forestry UniversityBeijing 100083China State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China Institute of Agricultural Resources and Environment Jiangsu Academy of Agricultural SciencesNanjing 210014China Institute of Forestry Chinese Academy of ForestryBeijing 100091China

Aims Elevated atmospheric CO_(2)has the potential to enhance the net primary productivity of terrestrial ***,the role of soil microorganisms on soil C cycling following this increased available C remains *** study was conducted to determine how quality and quantity of plant litter inputs would affect soil microorganisms and consequently C *** Soil microbial biomass and community structure,bacterial community-level physiological profile,and CO_(2)emission caused by different substrate C decomposition were investigated using techniques of biological measurements,chemical and stable C isotope analysis,and BIOLOG-ECO microplates in a semiarid grassland ecosystem of northern China in 2006 and 2007 by mixing three contrasting types of plant materials,C_(3)shoot litter(SC_(3)),C_(3)root litter(RC_(3)),and C4 shoot litter(SC4),into the 10-to 20-cm soil layer at rates equivalent to 0(C0),60(C60),120(C120)and 240 g C m2(C240).Important Findings Litter addition significantly enriched soil microbial biomass C and N and resulted in changes in microbial *** component analysis of microbial structure clearly differentiated among zero addition,C_(3)-plant-derived litter,and C4-plant-derived litter and among shoot-and root-derived litter of C_(3)plants;soilmicroorganismsmainly utilized carbohydrates without litter addition,carboxylic acids with C_(3)-plant-derived litter addition and amino acidswith C4-plant-derived litter *** also detected stimulated decomposition of older substratewith C4-plant-derived litter *** results showthat both quality and quantity of belowground litter are involved in affecting soil microbial community structure in semiarid grassland ecosystem.

关键词： belowground process decomposition plant litter microbial community priming effect semiarid grassland

Understanding the precipitation mechanism of copper-bearing phases in Al-Mg-Si system during thermo-mechanical treatment

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Journal of Materials Science & Technology 2022年第1期96卷 226-232页

作者： hongmei jin Renguo Guan Xianxiang Huang Ying Fu jin Zhang Xiaolin Chen Yu Wang Fei Gao Di Tie Key Laboratory of Lightweight Structural Materials Liaoning Province School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian 116028China

Al-Mg-Si alloys(6000 series)exhibit a promising prospect as conductive materials due to their high specific strength,high electrical conductivity,excellent formability,good weldability,corrosion resistance and relatively low cost[1-3].These optimum properties are largely attributed to the formation of small-sized,coherent or semi-coherent and metastable phases brought by aging treatment[1,4].

关键词： corrosion treatment coherent

Application of two remote sensing GPP algorithms at a semiarid grassland site of North China

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Journal of Plant Ecology 2011年第4期4卷 302-312页

作者： Jianfeng Liu Osbert Jianxin Sun hongmei jin Zhiyong Zhou Xingguo Han State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093People’s Republic of China Research Institute of Forestry Chinese Academy of ForestryBeijing 100091People’s Republic of China Graduate University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Institute of Forestry and Climate Change Research Beijing Forestry UniversityBeijing 100083People’s Republic of China MOE Key Laboratory for Silviculture and Conservation Beijing Forestry UniversityBeijing 100083People’s Republic of China Institute of Agricultural Resources and Environment Jiangsu Academy of Agricultural Sciences/Jiangsu Agricultural Waste Treatment and Recycle Engineering Research CenterNanjing 210014People’s Republic of China

Estimation of gross primary production(GPP)from remote sensing data is an important approach to study regional or global carbon ***,for a given algorithm,it usually has its limitation on applications to a wide range of vegetation types and/or under diverse environmental *** study was conducted to compare the performance of two remote sensing GPP algorithms,the MODIS GPP and the vegetation photosynthesis model(VPM),in a semiarid temperate grassland *** The study was conducted at a typical grassland site in Ujimuqin of Inner Mongolia,North China,over 2 years in 2006 and *** controls on GPP measured by the eddy covariance(EC)technique at the study site were first investigated with path analysis of meteorological and soil moisture data at a daily and 8-day time *** estimates of GPP derived from the MODIS GPP and the VPM with site-specific inputs were then compared with the values of EC measurements as ground truthing at the ***-specific emax(a)was estimated by using rectangular hyperbola function based on the 7-day flux data at 30-min intervals over the peak period of the growing season(May to September).Important Findings Between the two remote sensing GPP algorithms and various estimates of the fraction of absorbed photosynthetic active radiation(FPAR),the VPM based on FPAR derived from the enhanced vegetation index(EVI)works the best in predicting GPP against the ground truthing of EC GPP.A path analysis indicates that the EC GPP in this semiarid temperate grassland ecosystem is controlled predominantly by both soil water and *** site water condition is slightly better simulated by the moisture multiplier in the VPM than in the MODIS GPP algorithm,which is a most probable explanation for a better performance of the VPM than MODIS GPP algorithm in this semiarid grassland ecosystem.

关键词： MODIS GPP VPM eddy covariance path analysis grassland

3D-Printed Monolith Metallic Ni-Mo Electrodes for Ultrahigh Current Hydrogen Evolution

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Energy & Environmental Materials 2024年第5期7卷 224-233页

作者： Yanran Xun hongmei jin Yuemeng Li Shixiang Zhou Kaixi Zhang Xi Xu Win Jonhson Shuai Chang Teck Leong Tan Jun Ding Department of Materials Science and Engineering National University of SingaporeSingapore 117574Singapore Institute of High Performance Computing(IHPC) Agency for ScienceTechnology and Research(A^(*)STAR)1 Fusionopolis Way#16-16 ConnexisSingapore 138632Singapore Key Laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical UniversityNingbo 315103China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

In this work,we reported a series of monolithic 3D-printed Ni-Mo alloy electrodes for highly efficient water splitting at high current density(1500 mA cm^(-2))with excellent stability,which provides a solution to scale up Ni-Mo catalysts for HER to industry *** possible Ni-Mo metal/alloy phases were achieved by tuning the atomic composition and heat treatment procedure,and they were investigated through both experiment and simulation,and the optimal NiMo phase shows the best *** functional theory(DFT)calculations elucidate that the NiMo phase has the lowest H2O dissociation energy,which further explains the exceptional performance of *** addition,the microporosity was modulated via controlled thermal treatment,indicating that the 1100℃sintered sample has the best catalytic performance,which is attributed to the high electrochemically active surface area(ECSA).Finally,the four different macrostructures were achieved by 3D printing,and they further improved the catalytic *** gyroid structure exhibits the best catalytic performance of driving 500 mA cm^(-2)at a low overpotential of 228 mV and 1500 mA cm^(-2)at 325 mV,as it maximizes the efficient bubble removal from the electrode surface,which offers the great potential for high current density water splitting.

关键词： 3D-printed electrode Ni-Mo catalyst phase tuning ultra-high current density HER

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中国研究生教育地区发展差异及其对策研究

现代大学教育 2006年第1期22卷 89-94页

作者：金红梅北京大学教育学院

地区间教育发展差异问题是中国教育发展中一个非常重要又难以解决的问题。对于东、西部高等教育的差异与不平衡现象的研究,目前国内已经有很多,但对于研究生教育的地区发展差异问题的研究则尚显薄弱、欠缺。本文以中国地区间研究生教育... 详细信息

地区间教育发展差异问题是中国教育发展中一个非常重要又难以解决的问题。对于东、西部高等教育的差异与不平衡现象的研究,目前国内已经有很多,但对于研究生教育的地区发展差异问题的研究则尚显薄弱、欠缺。本文以中国地区间研究生教育的发展差异问题为研究对象,力图从实证分析、理论分析与政策分析三方面推进对这一问题的研究。

关键词：中国研究生教育区域分布不平衡

微囊藻毒素对陆生植物的污染途径及累积研究进展

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生态学报 2013年第11期33卷 3298-3310页

作者：靳红梅常志州江苏省农业科学院农业资源与环境研究所江苏省农业废弃物资源化工程技术中心南京210014

微囊藻毒素(Microcystins,MCs)是全世界范围内普遍存在、且随着水体污染的加剧而在自然环境中大量积聚的蓝藻毒素之一,对多种生物有着严重的毒性作用。MCs在生物体内富集并通过食物链传递,对人类健康造成威胁。近些年,MCs对陆生植物的... 详细信息

微囊藻毒素(Microcystins,MCs)是全世界范围内普遍存在、且随着水体污染的加剧而在自然环境中大量积聚的蓝藻毒素之一,对多种生物有着严重的毒性作用。MCs在生物体内富集并通过食物链传递,对人类健康造成威胁。近些年,MCs对陆生植物的毒害作用及累积研究尤为引人关注,取得了一批重要的研究成果。MC-LR(L为亮氨酸)和MC-RR(R为精氨酸)是淡水水体中普遍存在且危害较大的两种MCs异构体。针对这两种毒素,重点介绍其对陆生植物的污染途径、毒性作用及其在作物体内的累积量,对今后的研究进行了展望。

关键词：微囊藻毒素陆生植物污染途径毒性作用生物累积

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江苏省大型沼气工程沼液理化特性分析

农业工程学报 2011年第1期27卷 291-296页

作者：靳红梅常志州叶小梅马艳朱瑾江苏省农业科学院农业资源与环境研究所南京210014 南京农业大学资源与环境科学学院南京210095

集约化畜禽养殖场沼气工程是一项提供清洁能源、减轻环境污染、潜力巨大的生物质能源工程。该研究采集了江苏省21个规模化养猪场和奶牛场内大型沼气工程的沼液样本,进行了氮磷钾等理化特性分析。结果表明,由厌氧反应罐排出的沼液呈中性... 详细信息

集约化畜禽养殖场沼气工程是一项提供清洁能源、减轻环境污染、潜力巨大的生物质能源工程。该研究采集了江苏省21个规模化养猪场和奶牛场内大型沼气工程的沼液样本,进行了氮磷钾等理化特性分析。结果表明,由厌氧反应罐排出的沼液呈中性至微碱性,还原能力较强。猪场和奶牛场沼液中总氮分别集中在400～900mg/L和200～400mg/L范围内,其中铵态氮占总氮量的70%以上;总磷分别集中在30～100mg/L和300mg/L以上,可溶性磷含量变异较大;总钾分别集中在100～500mg/L和500mg/L以上。沼气工程运行时间对沼液理化性状影响显著,运行时间越长系统稳定性越好。氧化塘对沼液中颗粒物、氮素和磷素有显著的削减作用,多级氧化塘处理效果更明显。

关键词：沼气养分管理沼液理化特性氧化塘