|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Circular RNA and miR-7 in Cancer显示文摘 | Thomas B. Hansen J?rgen Kjems Christian K. Damgaard | 2013 | Cancer Research2013，，18： | 2 |
| 2 | Early dynamics in plant community trait responses to a novel, more extreme hydrological gradient显示文摘Aims For temperate regions such as Northern Europe,predicted climate change patterns include an increase in winter precipitation causing increased risk of flooding,whereas periods of droughts will become more frequent in summer.The aim of this study is to explore vari-ations in plant functional trait distributions along a hydrological gradient spanning from recurrent drought events to recurrent flood-ing-mimicking future precipitation patterns.Methods The experiment was conducted in a controlled grassland experi-ment over a period of 3 years.A novel and more extreme hydro-logical regime was achieved by manipulating the flow of a nearby stream thereby creating a continuous hydrological gradient from flooding during winter to drought during summer.Plant commu-nity responses were recorded along this hydrological gradient.Community-weighted trait distribution changes along the gradient were described using null models.Six functional traits were con-sidered:seed mass,leaf dry matter content(LDMC),leaf area,leaf thickness,specific leaf area(SLA)and height.Important findings Over time,responses in plant functional traits changed at the community level.Over the study period consistent changes occurred in the mean trait value of several traits.Communities in relatively dry plots became dominated by species with water-conserving life strategies,represented by high seed mass and thick leaves.In contrast,disturbance-resistant species(high leaf dry matter content)became dominant in flooded plots,indicating that persistence to flooding was the most important factor control-ling the functional structure in those communities.Furthermore,a high abundance of small-seeded species in flooded plots likely indicates higher frequency of species with higher dispersal ability through hydrochory.In conclusion,plant traits are useful for predicting responses to climate change,but abrupt and extreme climate event may cause unexpected responses because they have no analog to previously more stable conditions.We suggest that traits related to dispersal and resistance to disturbance are useful in describing responses to flooding and that these traits should be included in future inves-tigations of plant community responses to extreme hydrological events. | Andrea Oddershede Cyrille Violle Annette Baattrup-Pedersen Jens-Christian Svenning Christian Damgaard | 2019 | Journal of Plant Ecology2019，12，2： | 2 |
| 3 | Modelling the combined effect of chemical interference and resource competition on the individual growth of two herbaceous populations显示文摘 | Leticia San Emeterio Christian Damgaard Rosa M. Canals | 2007 | Plant and Soil (-)2007，，12： | 1 |
| 4 | 对植物物种相互作用备选模型的需求显示文摘近年来,经典的Lotka-Volterra模型在分析和解释植物物种间竞争性相互作用方面的局限性愈发凸显。目前已经明确的3个问题是:(1)缺乏频率依赖性,其对于物种的长期共存至关重要;(2)需要考虑影响个体表现的未测量(通常不可测量)的变量(例如,土壤养分或病原体的空间变化);以及(3)需要将测量误差与生物变异度分开。本文改进了经典的Lotka-Volterra竞争模型以期突破模型的局限。同时,我们将8个备选模型与丹麦草本植物群落中羊茅(Festuca ovina)和细弱剪股颖(Agrostis capillaris)3年以上的盖度数据拟合,应用贝叶斯建模框架来确定模型改进是否提高了模型的性能,并提高了其预测群落动态并因此检验假设的能力。研究结果表明,纳入频率依赖性和测量误差极大地改进了模型性能,但将可能的未测量变量考虑在内却未能改进其性能。我们的研究结果强调了在植物群落动态的定量研究中比较备选模型的重要性。只有考虑可能的备选模型,我们才能确定驱动群落构建和变化的因子,并提高我们预测植物群落行为的能力。 | Christian Damgaard Jacob Weiner | 2021 | Journal of Plant Ecology2021，14，5： | 1 |
| 5 | Describing inequality in plant size or fecundity显示文摘 | Christian Damgaard Jacob Weiner | 2000 | Ecology2000，81，4： | 1 |
| 6 | Modeling the growth of individuals in crowded plant populations显示文摘Aims We present an improved model for the growth of individuals in plant populations experiencing competition.Methods Individuals grow sigmoidally according to the Birch model,which is similar to the more commonly used Richards model,but has the advantage that initial plant growth is always exponential.The individual plant growth models are coupled so that there is a maximum total biomass for the population.The effects of size-asymmetric competition are modeled with a parameter that reflects the size advantage that larger individual have over smaller individuals.We fit the model to data on individual growth in crowded populations of Chenopodium album.Important Findings When individual plant growth curves were not coupled,there was a negative or no correlation between initial growth rate and final size,suggesting that competitive interactions were more important in determining final plant size than were plants’initial growth rates.The coupled growth equations fit the data better than individual,uncoupled growth models,even though the number of estimated parameters in the coupled competitive growth model was far fewer,indicating the importance of modeling competition and the degree of size-asymmetric growth explicitly.A quantitative understanding of stand development in terms of the growth of individuals,as altered by competition,is within reach. | Christian Damgaard Jacob Weiner | 2008 | Journal of Plant Ecology2008，1，2： | 1 |
| 7 | Describing inequali- ty in plant size or fecundity显示文摘 | Christian Damgaard Jacob Weiner | 2002 | Ecology2002，81，4： | 1 |
| 8 | Modelling individual plant growth at a variable mean density or at a specific spatial setting, C显示文摘 | Christian Damgaard | 2004 | R Biologies :- S Lopez M prieto J Dijkstra etal Statistical evaluation of mathematical models for microbial growth Intematonal Jourmal of Food Microbiology2004，，： | 1 |
| 9 | 特定环境和土地利用因素对酸性草原植被影响的时空建模显示文摘酸性草原受到了农业集约化作业(伴随着养分添加)、牲畜密度增加以及土地撂荒等多种因素的威胁。为了认识和量化所选环境和土地利用因子对酸性草地植被观测变化的影响,本研究采用结构方程模型拟合了大尺度时空精度植被覆盖监测数据。通过分层模型结构将测量和采样不确定性的重要来源纳入其中。此外,本研究也将测量和采样的不确定性与过程的不确定性分离,这在生成可能反馈给当地保护管理决策的生态预测时有着重要的意义。研究结果表明,一般而言,大气氮沉降的增加会导致非禾本草本植物的盖度,取而代之的会是更多的以禾草植物为主的酸性草原生境。沙质土壤的酸性相对较强,而土壤类型既会对植被构成直接的影响,也会通过影响土壤pH值的方式对植被产生间接影响。土壤的类型和土壤的pH值都会对酸性草原上的植被造成影响。对于植被覆盖情况在时间上的变化,尽管该模型仅解释了其中相对较小的一部分,但在使用该模型对局部生态状况进行预测并制定具有自适应性的管理计划时,对不确定性的量化仍然是有价值的。 | Christian Damgaard | 2022 | Journal of Plant Ecology2022，15，2： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员