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Country-level land carbon sink and its causing components by the middle of the twenty-first century

Ecological Processes 2021年第1期10卷 840-852页

作者： lifen jiang Junyi Liang Xingjie Lu Enqing Hou Forrest MHoffman Yiqi Luo Center for Ecosystem Science and Society Northern Arizona UniversityFlagstaffAZ 86011USA. College of Grassland Science and Technology China Agricultural UniversityBeijing 100083China. School of Atmospheric Sciences Sun Yat-sen UniversityGuangzhou 510275GuangdongChina. Computational Sciences&Engineering Division and Climate Change Science Institute Oak Ridge National LaboratoryOak RidgeTN 37831USA. Department of Biological Sciences Northern Arizona UniversityFlagstaffAZ 86011USA.

Background:Countries have long been making efforts by reducing greenhouse-gas emissions to mitigate climate *** the agreements of the United Nations Framework Convention on Climate Change,involved countries have committed to reduction ***,carbon(C)sink and its involving processes by natural ecosystems remain difficult to ***:Using a transient traceability framework,we estimated country-level land C sink and its causing components by 2050 simulated by 12 Earth System Models involved in the Coupled Model Intercomparison Project Phase 5(CMIP5)under ***:The top 20 countries with highest C sink have the potential to sequester 62 Pg C in total,among which,Russia,Canada,USA,China,and Brazil sequester the *** C sink consists of four components:productiondriven change,turnover-driven change,change in instantaneous C storage potential,and interaction between production-driven change and turnover-driven *** four components account for 49.5%,28.1%,14.5%,and 7.9%of the land C sink,***:The model-based estimates highlight that land C sink potentially offsets a substantial proportion of greenhouse-gas emissions,especially for countries where net primary production(NPP)likely increases substantially and inherent residence time elongates.

关键词： Carbon sink Carbon storage Earth system models Net primary productivity Residence time Terrestrial ecosystems

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Thermal acclimation of leaf respiration varies between legume and non-legume herbaceous

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Journal of Plant Ecology 2019年第3期12卷 498-506页

作者： Fei Peng Chang Gyo Jung lifen jiang Xian Xue Yiqi Luo Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhouGansu 730000China International Platform for Dryland Research and Education Arid Land Research CenterTottori University1390 HamasakaTottori 680-0001Japan College of Engineering Forestryand Natural SciencesNorthern Arizona UniversityFlagstaffAS 86011USA

Aims Ubiquitous thermal acclimation of leaf respiration could mitigate the respiration ***,whether species of different plant functional groups showing distinct or similar acclimation justifies the simple prediction of respiratory carbon(C)loss to a warming *** In this study,leaf dark respiration(Rd)of illinois bundleflower(IB,legume),stiff goldenrod(GR,C_(3) forbs),indian grass,little bluestem and king ranch bluestem(IG,LB and KB,C_(4) grass)were measured with detached leaves sampled in a 17-year warming *** Findings The results showed that Rd at 20℃ and 22℃(R_(20) and R_(22))were significantly lower in the warming treatment for all the five *** R_(22) in warmed than R_(20) in control in GR,KB,LB and IG imply acclimation homeostasis,but not in *** significant decline in temperature sensitivity of respiration(Q_(10))of GR resulted in the marginal reduction of Q_(10) across *** significant changes in Q_(10) of C_(4) grasses suggest different acclimation types for C_(3) forbs and C_(4) *** magnitude of acclimation positively correlated with leaf C/*** results suggest that non-legume species had a rela-tive high acclimation,although the acclimation type was different between C_(3) forbs and C_(4) grasses,and the legume species displayed no acclimation in ***,the plant functional types should be taken into account in the grassland ecosystem C models.

关键词： acclimation dark respiration warming legume plant functional types

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Effects of Composition and Thermal Cycle on Transformation Behaviors,Thermal Stability and Mechanical Properties of CuAlAg Alloy

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Journal of Materials Science & Technology 2003年第5期19卷 431-434页

作者： Yunqing MA, Chengbao jiang, lifen DENG and Huibin XUDepartment of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China Dept. of Mat. Sci. and Eng. Beijing Univ. of Aero. and Astron. Beijing 100083 China

The phase transformation behavior, mechanical properties, and the thermal stability of CuAlAg alloy were studied and minor rare earth (0.1 wt pct La+Ce) was added to improve the mechanical property of the studied alloy. It was found that Ag addition in the CuAl binary alloy can improve the stability of martensitic transformation and high Al content leads to the disappearing of martensitic transformation. The tensile strength and strain of the Cu-10.6AI-5.8Ag (wt pct) alloy were measured to be 383.5 MPa and 0.86%, respectively. With rare earth addition, the tensile strain increased from 0.86% to 1.47%. The CuAlAg alloy did not exhibit martensitic transformation on the second heating process. Its poor thermal stability still needs to be improved.

关键词： High temperature shape memory alloys CuAlAg Transformation behavior Thermal cycle Thermal stability Rare earth Mechanical property

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Diversity of root-associated fungi of Vaccinium mandarinorum along a human disturbance gradient in subtropical forests,China

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Journal of Plant Ecology 2017年第1期10卷 56-66页

作者： Yanhua Zhang Jian Ni Fangping Tang lifen jiang Tianrong Guo Kequan Pei Lifu Sun Yu Liang College of Life Sciences Shaoxing UniversityShaoxingChina State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijingChina Department of Microbiology and Plant Biology University of Oklahoma101 David L.Boren Blvd.NormanOK 73019USA

Aims Ericaceous plant species can host diverse fungi in their roots,including ericoid mycorrhizal fungi(ERMF),endophytes,pathogens and some species with unknown ***,how this diversity of fungi responds to different human disturbances is not well *** In this study,we examined the effects of different human disturbance on fungal diversity in hair roots of Vaccinium mandarinorum,an ericaceous *** DNA was extracted from hair roots of *** and high-throughput sequencing was applied to detect the diversity of root-associated fungi along a human disturbance gradient in subtropical forests in Gutianshan National Nature Reserve(GNNR)in East *** four forest types with different disturbance regime were:old growth forest(OGF),secondary forest with once cut(SEC I),secondary forest with twice cut(SEC II)and Cunninghamia lanceolata plantation(PLF).Important Findings The results showed that:(i)diverse fungal operational units(OTUs)were detected in hair roots of *** in the four types of forests,covering fungal phyla of Ascomycota,Basidiomycota,Chytridiomycota,Glomeromycota and Zygomycota;(ii)Community composition of root-associated fungi of *** in PLF was distinct from those in the other three forest types,and two types of secondary forests had similar fungal community composition;(iii)Different fungal families respond differently to human disturbances:fungal families with significant preference to OGF were ectomycorrhizal or saprophytic fungi while fungal families with higher relative abundance in PLF were plant pathogenic or saprophytic fungi;(iv)The first principal component(PC1)of plant community had a significant effect on composition of root-associated fungal community,while edaphic parameters showed no significant effect on fungal community composition in roots of *** results help to better understand the responses of both ericaceous plants and their fungal partners to human disturbance

关键词： fungal diversity ericoid mycorrhizal fungi succession Vaccinium mandarinorum

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Relative contributions of biotic and abiotic factors to the spatial variation of litter stock in a mature subtropical forest

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Journal of Plant Ecology 2019年第4期12卷 769-780页

作者： Jing Wang Qingsong Yang Yang Qiao Deli Zhai lifen jiang Guopeng Liang Xiaoying Sun Ning Wei Xihua Wang Jianyang Xia Zhejiang Tiantong Forest Ecosystem National Observation and Research Station&Research Center for Global Change and Ecological Forecasting Shanghai Key Lab for Urban Ecological Processes and Eco-RestorationSchool of Ecological and Environmental SciencesEast China Normal UniversityShanghai 200062China State Key Laboratory of Estuarine and Coastal Research Research Center for Global Change and Ecological ForecastingEast China Normal UniversityShanghai 200241China Key Laboratory of Economic Plants and Biotechnology Kunming Institute of BotanyChinese Academy of Sciences132 Lanhei RoadKunming 650201YunnanChina World Agroforestry Centre East and Central Asia Office132 Lanhei RoadKunming 650201YunnanChina Center for Ecosystem Science and Society Northern Arizona UniversityArizonaFlagstaffAZ 86011USA

Aims Dead plant material(***)is the major source of soil organic matter and thus plays a fundamental role in regulating soil carbon cycling in global forest *** storage of litter is jointly determined by its production from plants and decomposition in a given ***,only few studies have explored the relative importance of en-vironmental(***)and plant(***)factors in driving the spa-tial variation of litter *** objective of this study is to quantify the relative contributions of biotic and abiotic factors in affecting the spatial variation of aboveground litter stock in a mature subtropical *** The aboveground litter mass was sampled in 187 grids of a 20-hm forest dynamics plot in a subtropical broad-leave forest in eastern *** contributions of environmental variables,topographical and species variables on litter stocks were quantified by the boosted regression tree *** Findings The mean aboveground litter stock was 367.5 g m^(−2) in the Tiantong dynamics forest plot across all the 187 *** litter stock ranged from 109.2 to 831.3 g m^(−2) and showed a large spatial variation with the coefficient of variance as 40.8%.The boosted regression tree analysis showed that slope elevation and soil moisture were the most influential variables on the spatial variation of litter *** relatively influence of abiotic factors(environmental and topographical factors)was 71.4%,which is larger than biotic factors(28.6%).Overall,these findings sug-gest that abiotic factors play a more important role than plants in driving the spatial variation of aboveground litter stock in the subtropical *** that the global carbon-cycle models have been aiming to refine from the hundred kilometers to sub-kilometer scale,this study highlights the urgency of a better understanding of the spatial variation of litter stock on the fine scale.

关键词： litter stock spatial variability subtropical forest topography

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Reply to “Beyond microbial carbon use efficiency”

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National Science Review 2024年第4期11卷 35-37页

作者： Feng Tao Johannes Lehmann Ying-Ping Wang lifen jiang Bernhard Ahrens Kostiantyn Viatkin Stefano Manzoni Benjamin Z.Houlton Yuanyuan Huang Xiaomeng Huang Yiqi Luo Department of Ecology and Evolutionary Biology Cornell University Soil and Crop Sciences Section School of Integrative Plant ScienceCornell University CSIRO Environment Max Planck Institute for Biogeochemistry Department of Physical Geography and Bolin Centre for Climate Research Stockholm University Department of Global Development Cornell University Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Department of Earth System Science Ministry of Education Key Laboratory for Earth System Modelling Institute for Global Change Studies Tsinghua University

In their commentary, Xiao et al.[1]cautioned that the conclusions on the critical role of microbial carbon use efficiency (CUE) in global soil organic carbon (SOC) storage in the paper by Tao et al.[2] might be too *** claimed that Tao et al.’s study lacked mechanistic consideration of SOC formation and excluded important data *** et al. brought up important points,which can be largely reconciled with our findings by understanding the differences in expressing processes in empirical studies and in models.

关键词： beyond carbon efficiency microbial reply

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评点:五部获奖外国电影的表演特征

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当代电影 2016年第6期 22-26页

作者：姜丽芬北京电影学院表演学院副教授100088

2015年,世界影坛的表演艺术创作有这样五部作品是值得关注的：英国电影《45周年》,69岁的夏洛特·兰普林获第65届柏林国际电影节最佳女演员奖、第88届奥斯卡金像奖最佳女演员提名;法国电影《我的国王》,艾玛纽尔·贝克特获得第68届戛纳... 详细信息

2015年,世界影坛的表演艺术创作有这样五部作品是值得关注的：英国电影《45周年》,69岁的夏洛特·兰普林获第65届柏林国际电影节最佳女演员奖、第88届奥斯卡金像奖最佳女演员提名;法国电影《我的国王》,艾玛纽尔·贝克特获得第68届戛纳国际电影节最佳女演员奖。

关键词：女演员戛纳国际电影节柏林国际电影节世界影坛联合出品布鲁克林夏洛特镜头语言艺术创作艺术影片

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基于RFID普适计算环境的形式化上下文模型

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计算机工程 2007年第11期33卷 173-175页

作者：姜丽芬卢桂章辛运帏南开大学机器人与信息自动化研究所

提出了一个适合普适计算环境的、基于本体的形式化的上下文感知模型。该模型使用本体描述语言OWL描述上下文,采用层次化的设计方法,提高了上下文表达能力和快速上下文原型。为普适计算的上下文建模和应用、上下文重用和建立面向普适计... 详细信息

提出了一个适合普适计算环境的、基于本体的形式化的上下文感知模型。该模型使用本体描述语言OWL描述上下文,采用层次化的设计方法,提高了上下文表达能力和快速上下文原型。为普适计算的上下文建模和应用、上下文重用和建立面向普适计算环境的软件基础设施提供了一种可行的方法。

关键词：普适计算射频识别上下文感知本体形式化模型

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叶绿素计SPAD-502在林业上应用

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生态学杂志 2005年第12期24卷 1543-1548页

作者：姜丽芬石福臣王化田祖元刚东北林业大学森林植物生态学教育部重点实验室哈尔滨150040 南开大学生命科学学院天津300071 上海应用技术学院生物与食品工程系上海200233

叶绿素是植物光合作用的色素,传统方法测定叶绿素一般采用分光光度法。本研究采用便携式叶绿素计SPAD-502测定落叶松人工林下4个主要阔叶树种绿色度(SPAD值)的季节变化,并与分光光度法测定的叶绿素含量进行相关性分析。结果表明,SPAD值... 详细信息

叶绿素是植物光合作用的色素,传统方法测定叶绿素一般采用分光光度法。本研究采用便携式叶绿素计SPAD-502测定落叶松人工林下4个主要阔叶树种绿色度(SPAD值)的季节变化,并与分光光度法测定的叶绿素含量进行相关性分析。结果表明,SPAD值与叶绿素含量具有显著的相关性,SPAD值能较好地反映树木叶绿素含量的变化。因此,使用叶绿素计测定树木的叶绿素含量是完全可行的,在一定条件下可代替叶绿素含量的直接测定。由于叶绿素计SPAD-502携带方便、测定简便、迅速,且不损坏叶片,应在林业研究中积极推广使用。

关键词：落叶松人工林叶绿素计 SPAD-502 叶绿素含量

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新形势下上海研发公共服务平台战略转型研究

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科技进步与对策 2012年第23期29卷 24-27页

作者：马涛姜丽芬陈家宽复旦大学环境科学与工程系复旦大学生物多样性科学研究所上海200433

为了更好地促进科技创新和推动区域经济发展,上海研发公共服务平台必须尽快转型。回顾了上海研发公共服务平台多年来建设的成效,分析了其面临的新形势,结合国内外研发公共服务平台的最新发展态势,提出了上海研发公共服务平台今后战略转... 详细信息

为了更好地促进科技创新和推动区域经济发展,上海研发公共服务平台必须尽快转型。回顾了上海研发公共服务平台多年来建设的成效,分析了其面临的新形势,结合国内外研发公共服务平台的最新发展态势,提出了上海研发公共服务平台今后战略转型的基本思路和相应保障措施。

关键词：研发公共服务平台科技创新战略转型

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