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Positive interactions can produce species-rich communities and increase species turnover through time

Journal of Plant Ecology 2012年第4期5卷 417-421页

作者： youshi wang M.D.Farnon Ellwood Fernando TMaestre Zhiyong Yang Gang wang Chengjin Chu MOE Key Laboratory of Western China’s Environmental Systems Research School of Arid Environment and Climate ChangeLanzhou UniversityLanzhou 730000China Department of Zoology University of CambridgeDowning StreetCambridge CB23EJUK Area de Biodiversidad y Conservacion Departamento de Biología y GeologíaESCETUniversidad Rey Juan Carlosc/Tulipan s/n28933 MostolesSpain State Key Laboratory of Grassland Agro-ecosystems School of Life SciencesLanzhou UniversityLanzhou 730000China

Aims The process of facilitation,where a species increases the survival,growth,and fitness of another species,is becoming increasingly recognized as a critical factor in shaping the structure of plant *** process is particularly important in stressful *** few studies have attempted to incorporate positive interactions into community ecological theories such as the neutral theory of ***,we use an equalizing trade-off model as a foundation to study the potential impact of facilitation on species richness and community temporal *** Based on a spatially explicit birth–death trade-off model,we assume that the occurrence of facilitation is dependent on the presence of interspecific *** further propose that the realized birth rate for a given individual subject to facilitation is proportional to the number of interspecific neighbours within its ***,in our model,the individuals of rare species will benefit more from the existence of heterospecific individuals than common *** Findings As the facilitative coefficient increased,the species richness for simulated communities at the dynamically stochastic equilibrium was also *** also demonstrated that facilitation could increase the replacement of species through time:communities with facilitation become more dissimilar(*** smaller Bray–Curtis similarity values)than communities without or with a lower degree of facilitation after the same time *** from interspecific neighbours on rare species increased their population sizes and consequently made them less prone to extinction,thus enhancing species ***,in a saturated community,with the increase of species richness,mean population size of entire communities decreased,making species more prone to extinction on average,and thus increased the community temporal *** results suggest that future experimental work on the effect of

关键词： Bray–Curtis similarity index positive interactions species coexistence species temporal turnover

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The effects of fertilization on the trait-abundance relationships in a Tibetan alpine meadow community

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Journal of Plant Ecology 2016年第2期9卷 144-152页

作者： Xiaolong Zhou youshi wang Pengfei Zhang Zhi Guo Chengjin Chu Guozhen Du State Key Laboratory of Grassland and Agro-ecosystems School of Life SciencesLanzhou University222 Tianshui RoadLanzhou 730000GansuPeople's Republic of China Ministry of Education Key Laboratory of Western China’s Environmental Systems Research School of Arid Environment and Climate ChangeLanzhou University222 Tianshui RoadLanzhou 730000GansuPeople'Republic of China SYSU-Alberta Joint Lab for Biodiversity Conservation State Key Laboratory of Biocontrol and School of Life SciencesSun Yat-sen University135 Xingang RoadGuangzhou 510275GuangdongPeople'Republic of China

Aims Comparisons of the trait-abundance relationships from various habitat types are critical for community ecology,which can offer us insights about the mechanisms underlying the local community assembly,such as the relative role of neutral *** processes in shaping community ***,we explored the responses of trait-abundance relationships to nitrogen(N),phosphorus(P)and potassium(K)fertilization in an alpine *** Five fertilization treatments(an unfertilized control and additions of N,P,K and NPK respectively)were implemented using randomized block design in an alpine Tibetan *** relative abundance(SRA),plant above-ground biomass and species richness were measured in each *** 24 common species,we measured species functional traits:saturated height,specific leaf area(SLA)and leaf dry matter content(LDMC)in each treatment but seed size only in the unfertilized *** major axis(SMA)regression and phylogenetically independent contrasts(PICs)analysis were used to analyse species trait-abundance relationships in response to different fertilization *** Findings Positive correlations between SRA and saturated height were raised following N,P and NPK fertilizations,which indicated an increase in light competition in these *** P fertilized plots,SRA was also positively correlated with LDMC because tall grasses with a nutrients conservation strategy often have a relative competitive advantage in capturing limited light and soil *** K fertilized plots,neither the trait-abundance relationships nor above-ground biomass or species richness significantly differed from that in the control,which suggests that K was not a limiting resource in our study *** significant correlations between species traits and relative abundance in fertilized treatment suggest that trait-based selection plays an important role in determining species abundance within local communities in alpine meadows.

关键词： community structure community assembly functional trait non-neutral process species relative abundance

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Effects of traits,species identity and local environmental conditions on the assessment of interactions:insights from an alpine meadow community

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Journal of Plant Ecology 2009年第3期2卷 135-141页

作者： Chengjin Chu youshi wang Qi Li Luqiang Zhao Zhengwei Ren Sa Xiao Jianli Yuan Gang wang MOE Key Laboratory of Arid and Grassland Ecology Lanzhou UniversityLanzhou 730000China MOE Key Laboratory of Western China’s Environmental System Lanzhou UniversityLanzhou 730000China

Aims The prediction that facilitation is the dominant interaction in physically stressful conditions has been supported by many but not all field *** the present paper,we tested the effects of the identity of species,the local environmental conditions and the currencies of performance measurement on such *** Using contrasting two plots,six species,and up to five multiple traits,we comprehensively explored the effects of the above factors on the assessment of plant interactions in an alpine meadow of the QingHai Tibetan ***,we attempted to figure out the possible mechanisms underlying the responses *** data were analysed by both standard ANOVAs and multivariate *** findings Our results demonstrated that the response to the removal of neighbours was both species and trait specific,and the effect of the ocal environmental conditions was dependent on the species *** contrast between plots had crucial influence on the net interactions of Kobresia macrantha,but little effect on Elymus *** the abiotic conditions,neighbours had significant impact on soil temperature,moist and solar *** results contribute to advance our knowledge on the potential underlying factors influencing the assessment of facilitation.

关键词： positive interactions species specific trait specific neighbour removal multivariate statistics PERMANOVA

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Effects of fundamental structure parameters on dynamic responses of submerged floating tunnel under hydrodynamic loads

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Acta Mechanica Sinica 2009年第3期25卷 335-344页

作者： Xu Long Fei Ge Lei wang youshi Hong State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing China

This paper investigates the effects of structure parameters on dynamic responses of submerged floating tunnel （SFT） under hydrodynamic loads. The structure parameters includes buoyancy-weight ratio （BWR）, stiffness coefficients of the cable systems, tunnel net buoyancy and tunnel length. First, the importance of structural damp in relation to the dynamic responses of SPT is demonstrated and the mechanism of structural damp effect is discussed. Thereafter, the fundamental structure parameters are investigated through the analysis of SFT dynamic responses under hydrodynamic loads. The results indicate that the BWR of SFT is a key structure parameter. When BWR is 1.2, there is a remarkable trend change in the vertical dynamic response of SFT under hydrodynamic loads. The results also indicate that the ratio of the tunnel net buoyancy to the cable stiffness coefficient is not a characteristic factor affecting the dynamic responses of SFT under hydrodynamic loads.

关键词： Submerged floating tunnel Structural dampBuoyancy-weight ratio Cable stiffness coefficient ,Tunnel net buoyancy - Hydrodynamic load

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Using intraspecific variation of functional traits and environmental factors to understand the formation of nestedness patterns of a local forest community

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Journal of Plant Ecology 2022年第6期15卷 1185-1198页

作者： Weitao wang Yun Jiang Yongfa Chen Wenqi Luo Dong He youshi wang Chengjin Chu Buhang Li State Key Laboratory of Biocontrol School of Life Sciences/School of EcologySun Yat-sen UniversityGuangzhou 510275China Zhuhai Branch of State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University at ZhuhaiZhuhai 519087China College of Resources and Environment Science Xinjiang UniversityUrumqi 830046China

The concept of nestedness originated from the field of biogeography decades ago and has been widely used in metacommunities and biological interaction networks,but there is still a lack of research within local ***,studies on nestedness usually rarely incorporate the functional traits of the species and the environmental characteristics of the *** this study,we constructed a species presence–absence matrix of a 50-ha forest plot,used the simulated annealing algorithm to reveal the maximum nested structure and further tested the significance of nestedness patterns by constructing null *** nested ranks were used to represent the orders of species and quadrats in the maximum nestedness *** regression tree analysis was used to reveal the relationships of nested ranks with environmental factors and functional *** found that the co-occurrence pattern of local plant communities was significantly *** regression tree results showed that the nested ranks of quadrats were determined by soil available phosphorus,soil water content,soil organic carbon and soil *** variation of functional traits,including leaf C,leaf pH,leaf dry matter content and maximum photosynthetic rate rather than means of functional traits,provided a better explanation for the formation of species’nested *** the causes of species and quadrats nested ranks provides novel lens and useful insights into ecological processes underlying nestedness,and further improves our knowledge of how local plant communities are assembled.

关键词： environmental factors functional traits nestedness spatial pattern subtropical forest

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亚热带森林植物的叶片和根系功能性状部分耦合但具有不同的群落性状分布格局

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Journal of Plant Ecology 2024年第1期17卷 94-110页

作者： Wenqi Luo Oscar J Valverde-Barrantes Monique Weemstra James F Cahill Jr Zi wang Dong He Yongfa Chen Chengjin Chu youshi wang State Key Laboratory of Biocontrol School of Life Sciences/School of EcologySun Yat-sen UniversityGuangzhou 510275China International Center for Tropical Botany Department of Biological SciencesFlorida International UniversityMiamiFL 33199USA Department of Biological Sciences University of AlbertaEdmontonABT6G 2E9Canada School of Ecology and the Environment Xinjiang UniversityUrumqi 830046China

植物的生态过程依赖于叶片和根系的功能运行,但少有研究同时关注这两类性状在群落中的分布格局(CTD)。本文测定了广东亚热带森林44种共生木本植物的16个叶片和根系性状,旨在检验类比的叶片和根系性状是否耦合,是否沿类似的功能性状谱变... 详细信息

植物的生态过程依赖于叶片和根系的功能运行,但少有研究同时关注这两类性状在群落中的分布格局(CTD)。本文测定了广东亚热带森林44种共生木本植物的16个叶片和根系性状,旨在检验类比的叶片和根系性状是否耦合,是否沿类似的功能性状谱变异,是否表现出类似的CTD,其CTD和群落加权平均性状值(CWM)是否沿环境梯度表现出类似的响应。研究结果表明,叶片和根系性状变异的第一轴均呈显出由资源获取向资源保守变异的经济学谱,但叶片变异的第二轴主要由叶片碳含量表征,而根系变异的第二轴主要由反映菌根协作程度的根系粗细表征。类比的叶片和根系化学性状整体正相关,但形态性状的耦合程度较低。在群落水平上,叶片和根系性状第一轴的CWM均随海拔升高而变得更保守,而第二轴的变化则不一致。随土壤磷含量的降低或钾含量的升高,根系变得更细和在养分性状上更保守,而叶片性状无显著变化。当整合多维性状轴时,叶片性状呈发散格局,且随海拔、土壤磷和钾含量的增加呈收敛趋势;而根系性状呈收敛格局,但沿上述环境梯度呈发散趋势。该研究强调,叶片和根系性状与环境互作的差异可能导致不同的性状分布格局;植物可通过多样的地上和地下功能设计应对环境异质性。

关键词：性状维度群落构建叶片性状根系性状植物经济谱群落性状结构亚热带森林

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物种共存理论研究进展

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生物多样性 2017年第4期25卷 345-354页

作者：储诚进王酉石刘宇蒋林何芳良中山大学-阿尔伯塔大学生物多样性保护联合实验室中山大学有害生物控制与资源利用国家重点实验室中山大学生命科学学院广州510275 School of Biology Georgia Institute of Technologyatlantagausa30332 Department of Renewable Resources University of Alberta Edmonton

群落内的多物种如何共存是群落生态学的核心研究内容之一。经典的物种共存理论强调物种之间的生态位分化,注重具体共存机制的研究。这种以具体共存机制为研究对象的方法一定程度上促进了当代物种共存理论框架的形成。在当代物种共存理... 详细信息

群落内的多物种如何共存是群落生态学的核心研究内容之一。经典的物种共存理论强调物种之间的生态位分化,注重具体共存机制的研究。这种以具体共存机制为研究对象的方法一定程度上促进了当代物种共存理论框架的形成。在当代物种共存理论框架下,物种间的差异被划分为两类综合性的抽象差异——生态位差异和平均适合度差异,前者促进物种共存,对应稳定化机制;后者导致竞争排除,对应均等化机制。本文在简要回顾经典物种共存理论的基础上,介绍了当代物种共存理论的框架(包括理论的形成和定义)、基于该理论的部分实验验证工作及其在一些重要生态学问题中的应用。当代物种共存理论不仅揭示了群落内物种是如何共存的这一基本理论问题,更重要的是在全球变化的背景下该理论对生物多样性的保护和管理具有重要的应用价值。期望本文的介绍有助于国内生态学和生物多样性工作者了解当代物种共存理论,并将其应用于群落构建和生物多样性维持机制等方面的研究。

关键词：生态位稳定化机制均等化机制生态位差异平均适合度差异

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生物间高阶相互作用研究进展

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生物多样性 2020年第11期28卷 1333-1344页

作者：李远智肖俊丽刘翰伦王酉石储诚进中山大学有害生物控制与资源利用国家重点实验室中山大学生命科学学院广州510275

生物间的相互作用是物种共存和生物多样性维持的关键。传统的物种共存研究主要关注配对物种之间的直接相互作用,而忽略了更为复杂的间接相互作用。本文首先介绍了两种间接相互作用:链式相互作用(本质上仍是两两物种之间的相互作用)和高... 详细信息

生物间的相互作用是物种共存和生物多样性维持的关键。传统的物种共存研究主要关注配对物种之间的直接相互作用,而忽略了更为复杂的间接相互作用。本文首先介绍了两种间接相互作用:链式相互作用(本质上仍是两两物种之间的相互作用)和高阶相互作用。在此基础上,我们回顾了高阶相互作用定义的演变历史(包括狭义的高阶相互作用和广义的高阶相互作用)及其检验方法,并介绍了高阶相互作用在多营养级之间和同一营养级内的研究概况。目前,生态学家主要对多营养级之间(如食物网)的高阶相互作用的特征、发生机制、作用途径及实验证据等方面进行了详尽的研究。近年来,同一营养级内的高阶相互作用也开始受到关注,因此我们进一步介绍了同一营养级内个体水平高阶相互作用的重要意义和度量方法。从个体水平上研究高阶相互作用,既能统一狭义和广义高阶相互作用在定义上的争议,又可以将个体间的差异(如个体大小、个体的空间分布等信息)考虑进来。最后,本文对高阶相互作用一些可能的重要研究方向进行了展望:在自然群落中(尤其同一营养级内)检验高阶相互作用的普遍性与相对重要性,探讨高阶相互作用的发生机制以及如何将高阶相互作用整合到现有的理论体系中等。高阶相互作用的研究有助于我们全面深刻地理解物种共存和生物多样性的维持机制,丰富和完善群落生态学的理论框架,为人类世背景下的生物多样性保护和生态系统功能维持与提升提供基础。

关键词：密度介导的间接相互作用性状介导的间接相互作用相互作用的调节个体水平高阶相互作用非线性密度制约营养级生态网络

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X波段全极化调频连续波测雨雷达在山洪预报预警中的示范应用

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中国防汛抗旱 2020年第9期30卷 48-53页

作者：刘昌军刘启田济扬刘燕京王佑实王超中国水利水电科学研究院北京100038 水利部防洪抗旱减灾工程技术研究中心北京100038 安徽威德萨科技有限公司马鞍山243000

针对山洪灾害预报预警局地短历时降水监测精度不高和时空不连续问题,详细介绍了X波段全极化调频连续波测雨雷达原理、特点和性能,基于河南栾川县全国山洪灾害防治试验示范基地已建设的X波段全极化测雨雷达QX-60设备,研发了测雨雷达数据... 详细信息

针对山洪灾害预报预警局地短历时降水监测精度不高和时空不连续问题,详细介绍了X波段全极化调频连续波测雨雷达原理、特点和性能,基于河南栾川县全国山洪灾害防治试验示范基地已建设的X波段全极化测雨雷达QX-60设备,研发了测雨雷达数据解译、传输和可视化显示软件,并接入了栾川县小流域暴雨山洪预报预警系统,准确预报预警了2019年栾川县暴雨山洪过程。在近几年的运行过程中,与栾川县自动雨量站、洛阳市C波段测雨雷达进行了降水数据对比分析和验证,X波段全极化调频连续波测雨雷达在降水数据监测精准度、分辨率、时效性和可靠性方面均表现优越,下一步可在山洪灾害、城市及中小流域洪水监测预报预警中进行推广应用。

关键词： X波段全极化测雨雷达山洪灾害洪水预报预警面雨量监测

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Constraints on holographic QCD phase transitions from PTA observations

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 71-78页

作者： Song He Li Li Sai wang Shao-Jiang wang Center for Theoretical Physics and College of Physics Jilin University School of Physical Science and Technology Ningbo University Max Planck Institute for Gravitational Physics (Albert Einstein Institute) CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences (UCAS) School of Physical Sciences University of Chinese Academy of Sciences (UCAS) Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves(GWs) within the standard model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

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