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Spatial organization of multiple plant species in arid ecosystems:linking patterns and processes

Journal of Arid Land 2010年第1期2卷 9-13页

作者： Amit CHAKRAbORTY b.larry li Ecological Complexity and Modeling Laboratory Department of Botany and Plant SciencesUniversity of California Center for Conservation biology University of California XIEG-UCR International Center for Arid Land Ecology University of California

Spatial organization of multiple plant species that appears as a non-random distribution of vegetative patches is one of the mostly observed spatial patterns in arid ecosystems. Yet understanding of ecological processes allowing this spatial pattern to emerge through interspecific interactions is still lacking. With a proposed conceptual model involving interspecific trade-offs between species competitive ability and colonization ability, we have argued that within patch abundance dynamics regulated by the mechanisms of competition are strongly influenced by the between patches colonization dynamics that are maintained via this trade-offs and it holds a positive, intraspecific occupancy-abundance relationship, in which increased patch occupancy increases species density within inhabiting patches. In a constant environment, while local abundance dynamics approach toward a stable equilibrium point, a fixed spatial arrangement of species can be retained through this coupled dynamics. However, in fluctuating environments where existence of such stable equilibriums is highly uncertain, it may involve continuous transitions from one community state to another as species re-organized themselves over space through the rapid changes in local species abundances. While some of the inhabiting patches are destroyed exogenously or endogenously, or species responses to increasing environmental fluctuations vary increasingly with time, discontinuous transitions into an abrupt, irreversible state of the community dynamics may occur, as with this effect the inherent positive relationship between occupancy and abundance of species is no longer maintained.

关键词： spatial organization competition-colonization tradeoffs spatial coexistence occupancy-abundance relationship

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生态模型在河口管理中的应用研究综述

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水科学进展 2015年第5期26卷 739-751页

作者：申霞 b.larry li 南京水利科学研究院水文水资源与水利工程科学国家重点实验室江苏南京210029 Ecological Complexity and Modeling Laboratory University of California at Riverside

河口作为河流和海洋的交汇地,具有生态交错带特性,其在自然和人类活动双重压力下发生着演变。生态模型是研究生态系统结构、功能及其时空演变规律以及生物过程对于生态系统的影响及其反馈机制的重要手段。采用不同方法对生态模型进行分... 详细信息

河口作为河流和海洋的交汇地,具有生态交错带特性,其在自然和人类活动双重压力下发生着演变。生态模型是研究生态系统结构、功能及其时空演变规律以及生物过程对于生态系统的影响及其反馈机制的重要手段。采用不同方法对生态模型进行分类,综述各类生态模型的特性、优缺点及应用领域。讨论建模过程中模型变量与函数、模型整合及时空尺度、模型参数取值及不确定等关键技术问题。分析各类生态模型在河口生态工程设计、生态系统修复、生态系统评价、系统决策支持等管理领域的应用。尽管中国河口生态模型构建及应用已有一些成果,但与国外相比,在理论生态学及数据积累方面仍有一定差距。

关键词：河口生态系统生态模型分类时空尺度人类活动海岸带综合管理

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美国煤矿废弃地的生态修复

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生态学报 2011年第1期31卷 276-285页

作者：张成梁 b.larry li 轻工业环境保护研究所北京100089 山西省林业科学研究院太原030012 University of California RiversideCA 92521-0124U.S.A.

在对美国煤矿废弃地生态修复项目实地考察的基础上,结合相关文献资料,介绍了其煤矿废弃地生态修复的管理体系、资金来源及使用\技术路线及保障措施。结合实例介绍了美国煤矿废弃地生态修复的工程措施,并重点介绍了"师法自然生态修复法"... 详细信息

在对美国煤矿废弃地生态修复项目实地考察的基础上,结合相关文献资料,介绍了其煤矿废弃地生态修复的管理体系、资金来源及使用\技术路线及保障措施。结合实例介绍了美国煤矿废弃地生态修复的工程措施,并重点介绍了"师法自然生态修复法"的新理念及其指导下的生态修复设计和生态修复工程建设。"师法自然生态修复法"是基于地形、地貌、水文、气象、气候等条件,模拟自然的生态修复过程。"师法自然生态修复法"将会对我国的生态修复产生积极而深远的影响。

关键词： “师法自然生态修复法” 废弃地煤矸石

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环境DNA技术在地下生态学中的应用

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生态学报 2015年第15期35卷 4968-4976页

作者：于水强王文娟 b.larry li 南京林业大学林业生态工程重点实验室南京210037 加州大学河滨分校植物科学系加利福尼亚美国925210124

地下生态过程是生态系统结构、功能和过程研究中最不确定的因素。由于技术和方法的限制,作为"黑箱"的地下生态系统已经成为限制生态学发展的瓶颈,也是未来生态学发展的主要方向。环境DNA技术,是指从土壤等环境样品中直接提取DNA片段,然... 详细信息

地下生态过程是生态系统结构、功能和过程研究中最不确定的因素。由于技术和方法的限制,作为"黑箱"的地下生态系统已经成为限制生态学发展的瓶颈,也是未来生态学发展的主要方向。环境DNA技术,是指从土壤等环境样品中直接提取DNA片段,然后通过DNA测序技术来定性或定量化目标生物,以确定目标生物在生态系统中的分布及功能特征。环境DNA技术已成功用于地下生态过程的研究。目前,环境DNA技术在土壤微生物多样性及其功能方面的研究相对成熟,克服了土壤微生物研究中不能培养的问题,可以有效地分析土壤微生物的群落组成、多样性及空间分布,尤其是宏基因组学技术的发展,使得微生物生态功能方面的研究成为可能;而且,环境DNA技术已经在土壤动物生态学的研究中得到了初步应用,可快速分析土壤动物的多样性及其分布特征,更有效地鉴定出未知的或稀少的物种,鉴定土壤动物类群的幅度较宽;部分研究者通过提取分析土壤中DNA片段信息对生态系统植物多样性及植物分类进行了研究,其结果比传统的植物分类及物种多样性测定更精确,改变了以往对植物群落物种多样性模式的理解。同时,环境DNA技术克服传统根系研究方法中需要洗根、分根、只能测定单物种根系的局限,降低根系研究中细根区分的误差,并探索性地用于细根生物量的研究。主要综述了基于环境DNA技术的分子生物学方法在土壤微生物多样性及功能、土壤动物多样性、地下植物多样性及根系生态等地下生态过程研究中的应用进展。环境DNA技术对于以土壤微生物、土壤动物及地下植物根系为主体的地下生态学过程的研究具有革命性意义,并展现出良好的应用前景。可以预期,分子生物学技术与传统的生态学研究相结合将成为未来地下生态学研究的一个发展趋势。

关键词：环境DNA 地下生态学土壤微生物土壤动物物种多样性根系生态

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Priority areas at the frontiers of ecology and energy

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Ecosystem Health and Sustainability 2018年第10期4卷 2-5页

作者： S.K.Chou Robert Costanza Philip Earis Klaus Hubacek b.larry li Yonglong Lu Roland Span Hao Wang Jianping Wu Yegang Wu Jerry J.Yan Department of Mechanical Engineering National University of SingaporeSingaporeSingapore Crawford School of Public Policy The Australian National UniversityCanberraAustralia Joule Publication Department CellPressCambridgeMAUSA Geography Department University of MarylandCollege ParkMDUSA Department of botany and Plant Sciences University of California RiversideRiversideCAUSA State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijingChina Thermodynamics Faculty of Mechanical EngineeringRuhr University BochumBochumGermany Joule Publication Department China Institute of Hydraulic and Hydropower ResearchBeijingChina School of Civil Engineering Tsinghua UniversityBeijingChina Joule Publication Department Beijing Bold Institute of Eco-City Planning&DesignBeijingChina Joule Publication Department Royal Institute of Technology(KTH)StockholmSweden

The complexity of economic development and humanitarian crisesmeans that energy science and technology should be involved in actions that address almost everymajor challenges of ecosystem health and *** is the engine of the world economy and the key to ecosystems’functioning,which also has a great impact on global *** energy crisis,environmental pollution,overuse of natural resources,water supply shortages,global climate disruption,and deteriorating ecosystems are major challenges to address in order to achieve the United Nations Sustainable Development Goals(SDGs).In light of the frontiers in energy sciences and disruptive innovation in eco-tech,we recognize the need to review and establish working mechanisms that identify and examine issues that are critical to future sustainable development,to offer advice to decision-makers in different social sectors(public and private),to secure a shared future for mankind,and to achieve shared prosperity and common interests through international communications and collaborations.

关键词： Energy ecology sustainability United Nations Goals

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洪湖水体藻类藻相特征及其对生境的响应

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生态学报 2012年第3期32卷 680-689页

作者：卢碧林严平川田小海金卫斌 b.larry li 长江大学长江中游湿地农业教育部工程研究中心荆州434025 长江大学地球化学系荆州434023 湖北省荆州市水文水资源局荆州434000 黄冈师范学院化学与生命科学学院黄冈438000 University of California Riverside CA 92521-0124 USA

藻类是水生态系统的重要成分,它的群落结构、细胞密度变化与水环境相适应,随水环境的变化而改变,因此藻相变化是评价水体质量的一项重要指标。2009—2010年在洪湖水面不同方位布点采样,对水体的浮游藻类藻相(群落结构、密度)和水质状况... 详细信息

藻类是水生态系统的重要成分,它的群落结构、细胞密度变化与水环境相适应,随水环境的变化而改变,因此藻相变化是评价水体质量的一项重要指标。2009—2010年在洪湖水面不同方位布点采样,对水体的浮游藻类藻相(群落结构、密度)和水质状况(水位(water level,H)、水温(water temperature,tw)、透明度(transparency,SD)、总氮(total nitrogen,TN)、总磷(totalphosphorus,TP)、高锰酸盐指数(permanganate index,CODMn)和叶绿素含量(chlorophyll a,Chl-a)等)进行了逐月的调查、监测,采用湖库营养状态指数法对湖泊富营养化评价,并运用多元逐步回归方法建立水体藻类与生境因子的回归方程。结果表明:洪湖水体总体上已达到轻度富营养化状态;藻类以蓝藻门、硅藻门和绿藻门为主,共鉴定出7门65属,藻细胞密度为1.14×106—3.24×107个/L,藻相季节变化特征明显。藻类组成以蓝藻门密度最高(52.93%),硅藻门(25.96%)和绿藻门(16.83%)次之,隐藻门(1.98%)、金藻门(1.64%)、裸藻门(0.42%)和甲藻门(0.25%)相对较低。藻类藻相及优势种在不同季节有所差异,冬春季节(12—5月)以硅藻门的直链藻、小环藻和针杆藻为优势种,夏秋季节(7—11月)以蓝藻门的鱼腥藻和微囊藻为优势种;湖泊藻类细胞密度与tw、CODMn呈正显著相关关系,与H、TN、TP、SD相关关系不显著;藻细胞生长逐步回归方程为y=3.7815+0.0794tw+0.5670CODMn-1.3467SD,藻细胞生长主要受水温和有机污染物等的影响,氮磷不是藻类生长的控制因子;在湖泊不同区域,环境条件存在差异,导致藻类生长过程中起主导作用的环境因子存在一定的差异,蓝藻生长主要受tw、CODMn和SD控制,绿藻生长主要受H、tw和CODMn影响,而硅藻生长决定于水体CODMn。

关键词：洪湖藻相生境富营养化

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典型微塑料对水库缓流区消落带土壤Cu形态的影响及其与DOM的关联

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环境科学学报 2023年第9期43卷 346-356页

作者：何泽琴李亚飞李俊张松林陈明 b.larry li 重庆交通大学重庆400074 中国科学院重庆绿色智能技术研究院重庆400714 中国科学院大学重庆学院重庆400714 Ecological Complexity and Modeling Laboratory University of CaliforniaRiversideCA 92521-0124USA

铜(Cu)是三峡水库蓄水后消落带土壤中的典型重金属,揭示其迁移转化过程对三峡水库水环境保护具有重要意义.为探究微塑料(Microplastics,MPs)对三峡水库缓流区消落带土壤Cu迁移转化过程的影响,本试验以水动力条件弱为背景进行室内水位变... 详细信息

铜(Cu)是三峡水库蓄水后消落带土壤中的典型重金属,揭示其迁移转化过程对三峡水库水环境保护具有重要意义.为探究微塑料(Microplastics,MPs)对三峡水库缓流区消落带土壤Cu迁移转化过程的影响,本试验以水动力条件弱为背景进行室内水位变化淹水实验,分析了高密度聚乙烯(HDPE)和聚对苯二甲酸乙二醇酯(PET)两种典型MPs对三峡水库缓流区消落带土壤Cu形态的影响,同时结合紫外-可见吸收光谱分析了MPs影响下土壤溶解性有机质(Dissolved Organic Matter,DOM)与土壤Cu形态的关系.结果表明,两种MPs的添加均能导致土壤中残渣态和铁锰氧化物结合态Cu含量的降低及有机结合态Cu含量的增加,且分别能同时增加和降低土壤中可交换态和碳酸盐结合态Cu含量,最终表现为土壤中Cu总量降低.相关性分析结果显示,MPs存在情况下,土壤DOM特性如DOC含量、CDOM浓度(α(355))、芳香性(SUVA_(254))、疏水性(SUVA_(260))、分子量(E2/E3)及来源组分(E2/E4、E3/E4)与土壤Cu形态及总量均具显著相关关系.结果为阐明在MPs和水库水位变化共同作用下三峡水库消落带Cu的环境行为提供了科学基础.

关键词：微塑料(MPs) 土壤缓流区消落带三峡水库 Cu赋存形态溶解性有机质(DOM)

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Data error propagation in stacked bioclimatic envelope models

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Integrative Zoology 2024年第2期19卷 262-276页

作者： Xueyan li babak NAIMI Peng GONG Miguel b.ARAÚJO Guangdong Provincial Key Laboratory of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and ApplicationGuangzhou Institute of GeographyGuangdong Academy of ScienceGuangzhouChina ‘Rui Nabeiro’biodiversity Chair CHANGE-MED InstituteUniversity ofÉvoraÉvoraPortugal Department of Geography and Department of Earth Sciences University of Hong KongHong KongChina Department of biogeography and Global Change National Museum of Natural SciencesCSICMadridSpain

Stacking is the process of overlaying inferred species potential distributions for multiple species based on outputs of bioclimatic envelope models(bEMs).The approach can be used to investigate patterns and processes of species *** data limitations on individual species distributions are inevitable,but how do they affect inferences of patterns and processes of species richness?We investigate the influence of different data sources on estimated species richness gradients in *** fitted bEMs using species distributions data for 334 bird species obtained from(1)global range maps,(2)regional checklists,(3)museum records and surveys,and(4)citizen science data using presence-only(Mahalanobis distance),presence-background(MAXENT),and presence–absence(GAM and bRT)*** species predictions were stacked to generate species richness ***,we show that different data sources and bEMs can generate spatially varying gradients of species *** environmental predictors that best explained species distributions also differed between data *** using citizen-based data had the highest accuracy,whereas those using range data had the lowest *** richness patterns estimated by GAM and bRT models were robust to data *** multiple data sets exist for the same region and taxa,we advise that explicit treatments of uncertainty,such as sensitivity analyses of the input data,should be conducted during the process of modeling.

关键词： richness patterns species distribution stacked bioclimatic envelope models uncertainty

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Temporal variability and sources of PFAS in the Rio Grande,New Mexico through an arid urban area using multiple tracers and highfrequency sampling

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Emerging Contaminants 2024年第3期10卷 205-220页

作者： Kimberly R.beisner Rebecca E.Travis David A.Alvarez larry b.barber Jacob A.Fleck Jeramy R.Jasmann U.S.Geological Survey 6700 Edith Blvd NEAlbuquerqueNM87113USA U.S.Geological Survey 4200 New Haven RoadColumbiaMO65201USA U.S.Geological Survey 3215 Marine St.BoulderCO80303USA U.S.Geological Survey 6000 J St.Placer Hall.SacramentoCA95819USA

Per-and polyfluoroalkyl substances(PFAS)are ubiquitous in the environment but sources are not well defined for temporal and spatial aspects within an urban environment,and especially for an arid urban environment subject to seasonal short term high-intensity precipitation events.A focused diel sampling was conducted in the summer of 2021 to assess the temporal and spatial variability of PFAS in the Rio Grande near Albuquerque,New Mexico and showed an order of magnitude increase of PFAS as it flows through the Albuquerque urban *** samples were collected at two different locations on the Rio Grande in addition to wastewater treatment plant(WWTP)effluent that discharges directly to the Rio Grande between the sampling ***-term high-intensity precipitation events occurred during the study period and mobilized PFAS from urban *** organic matter composed of tryptophan-like organic substances and refined fuel and fuel byproducts,characteristic of an urban signature,were also related to the precipitation *** PFAS in discharge from the WWTP was consistent over a 24-h period with slight differences in some *** presence on the Rio Grande downstream of the WWTP was evidenced by a gadolinium anomaly as well as increases in several other trace elements,total dissolved nitrogen,and fluorescence indicators,in addition to *** varied depending on source contribution,where urban runoff was associated with PFOA,PFOS,and PFbA,whereas PFHxA and PFPeA were associated with wastewater *** addition,passive polar organic chemical integrative samplers(POCIS)using hydrophilic-lipid balance(HLb)sorption media were deployed for a month at two locations on the Rio Grande to assess longer term PFAS *** POCIS results show some compounds(PFPeA and PFHpA)were greater than the average concentration from discrete samples,whereas other compounds(PFHxA,PFOA,PFDA,and PFNA)were lower in the POCIS,and PFOS was very simila

关键词： wastewater Rio runoff

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Greatly enhanced corrosion/wear resistances of epoxy coating for Mg alloy through a synergistic effect between functionalized graphene and insulated blocking layer

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Journal of Magnesium and Alloys 2024年第1期12卷 332-344页

作者： Z.Y.Xue X.J.li J.H.Chu M.M.li D.N.Zou L.b.Tong School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Advanced Design and Manufacturing for Vehicle body Hunan UniversityChangsha 410082China

The poor corrosion and wear resistances of Mg alloys seriously limit their potential applications in various *** conventional epoxy coating easily forms many intrinsic defects during the solidification process,which cannot provide sufficient *** the current study,we design a double-layer epoxy composite coating on Mg alloy with enhanced anti-corrosion/wear properties,via the spin-assisted assembly *** outer layer is functionalized graphene(FG)in waterborne epoxy resin(WEP)and the inner layer is Ce-based conversion(Ce)*** FG sheets can be homogeneously dispersed within the epoxy matrix to fill the intrinsic defects and improve the barrier *** Ce film connects the outer layer with the substrate,showing the transition *** corrosion rate of Ce/WEP/FG composite coating is 2131 times lower than that of bare Mg alloy,and the wear rate is decreased by~90%.The improved corrosion resistance is attributed to the labyrinth effect(hindering the penetration of corrosive medium)and the obstruction of galvanic coupling *** synergistic effect derived from the FG sheet and blocking layer exhibits great potential in realizing the improvement of multi-functional integration,which will open up a new avenue for the development of novel composite protection coatings of Mg alloys.

关键词： Mg alloy Functionalized graphene Epoxy coating Corrosion/wear resistance blocking layer

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