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species competition     
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  种群竞争
     Asymptotic Analysis of Nonlinear Two Species Competition in a Reaction-Diffusion System
     非线性两种群竞争反应扩散系统的渐近分析
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     Reseach of Trajectory for two Species Competition Model in Pollutde Environment
     污染环境中两种群竞争模型的轨线研究
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     Singularly Perturbed Solution of Two Species Competition
     两种群竞争模型的奇摄动群
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     A class of nonlinear two species competition singularly perturbed initial-boundary-value problems in a reaction-diffusion system in biomathematics was studies using the modern method of differential equation.
     利用微分方程的近代方法研究了生物数学中一类非线性两种群竞争模型的反应扩散系统奇摄动问题.
短句来源
     Existence of Periodic Solution of Two Species Competition Dynamics Systems with Neutral Delay and Several Deviating Arguments
     具有中立时滞和变差元的两种群竞争动力系统周期解的存在性(英文)
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  物种竞争
     This paper also deals with the design principle,value evaluation,standard system,utilization of withered tree landscape species competition and contrariety between protection and utilization.
     文章还涉及古树景观的设计原则、价值评测、指标体系和枯树景观利用以及物种竞争、开发与保护的矛盾等问题。
短句来源
     The results showed that at the equilibrium, the coexistence condition of population competition is migratory ability and competition ability take on exponential negative correlation, the outcome of competition makes the superior and inferior sequence changed, the exclusion and coexistence of species competition was affected by migratory ability and competition ability, the metapopulations which are excluded in local patches can exist in regional scale, that is escaping coexistence.
     结果表明,在平衡态,种群竞争共存的条件是其竞争能力与扩散能力呈现指数型负相关关系,竞争的结果使物种的强弱序列发生变化; 物种竞争排除与共存受迁移扩散能力和竞争能力影响很大,在局域斑块上竞争排斥的集合种群在广域尺度上可以竞争共存,即逃亡共存.
短句来源
     (4)The competitive and dispersal ability have a profound effect on the competing elimination and coexistence of species, the condition of species competition and coexistence is the competitive ability have a nonlinear minus correlation with dispersal power.
     (4)物种竞争排斥与共存受迁移扩散能力和竞争能力影响很大,竞争共存的条件是其竞争能力与扩散能力呈非线性负相关关系;
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  种间竞争
     The Primary Study on the Characters of Inter Species Competition and Conspecifies Tolerance between Termites
     几种白蚁种间竞争与种内相容性初步研究
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     When the model has not inter species competition,the problem of population control was also discussed.
     当种群只有种内竞争而无种间竞争时 ,也考虑了种群的控制问题 ,即通过控制毒素输入 ,使种群的规模最终进入我们所希望的集合内
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     The plant community stability is influenced by species competition, environmental pressure and human activities.
     绿洲荒漠植物群落稳定性受种间竞争、环境压力和干扰活动三个因素的影响,即使建群种相同的群落,其稳定性也会出现较大差异。
短句来源
     The results in this paper also show: the factors which affect population pattern are two aspects, one is biological characteristics of species, the other is intra and inter species competition caused by environmental conditions;
     分析表明影响种群分布格局的因子大致可归纳为两类:一是物种本身的生物学特性,二是由环境条件引起的种内种间竞争
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     Using the adjacent interference model, this paper studied the inner and intra species competition intensity of main species in mountain forestry community of western Henan Province and the competition interference state of species and individual in the community.
     运用邻体干扰指数模型,分析了豫西山区森林群落中主要种群的种内种间竞争强度,以及种群和个体在群落中的竞争干扰状态.
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  “species competition”译为未确定词的双语例句
     2.) The natural distribution and occurrence of Isoetes sinensis plants in Mainland China are closely correlated with its habitat characteristics including water physical and chemistry characteristics, species competition and water level.
     2.)中华水韭的自然分布及其生长状况与其栖息地的生境特征,特别是水体物理化学特性以及伴生种的竞争、水位波动等密切相关。
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     Based on field survey, the structure and distribution patterns of Rhododendron delavayi population are studied in the paper, the results show that the distribution pattern of Rhododendron delavayi populations is mainly aggregated pattern, but as ages increasing ,the intensive interspecies and between species competition make the individuals decrease and the distribution pattern become the random one .
     本文在野外调查的基础上对马缨杜鹃种群结构和空间分布格局进行了分析,结果表明马缨杜鹃的空间分布格局主要为集群分布,部分地段表现为衰退型种群,特别是有性繁殖更新层的缺失使之成为一种不连续种群。 为了这一景观的可持续发展,可以尝试人工干预该种群的顺利更新和长期稳定。
短句来源
     Niche overlap among species causes species competition and exclusion among species,and niche separation among species causes species harmo nic coexistence.
     生态位的重叠导致物种间的竞争与排斥,生态位的分离,导致物种间的协调平衡。
短句来源
     In this paper, the nonautonomous three species competition system are considered, where all the parameters are time-dependent and asymptotically approach periodic function, respectively. Sufficient conditions are determined that global attractivity of a periodic solution.
     本文讨论了三种群非自治竞争系统,此系统中所有的参数是与时间相关的,并且分别渐近接近于周期函数,得到了保证周期解吸引性的条件.
短句来源
     In this paper, We investigate two species competition system with diffusion and time delay and functional response and impulsive effect By using the method coincidence degree theorem, Sufficient conditions are obtained for the existence of positive periodic solutions Moreover, some known results improved and generalized.
     讨论一类具有脉冲和功能反应的两种群扩散时滞的竞争系统,利用重合度的理论 得到了系统存在正周期解的充分条件,进而改进了现有的一些结果.
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  species competition
Second, previously separated populations come in contact and may adapt to mitigate inter-species competition.
      
Aggressive species competition by Typha latifolia in wetland systems on marl-derived soils may threaten the unique vegetation in these areas.
      
Since changes in nutrient availability as a result of management measures affect the outcomes of heathland succession and species competition, studies on this issue are important from both a nature conservation and management point of view.
      
Inter-species competition for applied nutrients may be managed by weed control in cultivated communities.
      
Significant intra-species competition appeared to occur between G.
      
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Competition in ecological system can be simulated by certain math-physical models. The existence of limit cycles in the models shows the region of ecological equivalence. Therefore, searching the limit cycles and the limit cycle behaviors exhibited by the models is very important.According to limit cycle theorem with Rosenzweig-Mac Arthur equation on two species competition system, a computational method was used to select initial values. The results of numerical computations demonstrate the existence...

Competition in ecological system can be simulated by certain math-physical models. The existence of limit cycles in the models shows the region of ecological equivalence. Therefore, searching the limit cycles and the limit cycle behaviors exhibited by the models is very important.According to limit cycle theorem with Rosenzweig-Mac Arthur equation on two species competition system, a computational method was used to select initial values. The results of numerical computations demonstrate the existence of a limit cycle near initial point, which offers a possible explanation for certain regular population oscillations of the predator-prey system : The peak density of the predator and prey are Xmax = Y (1) max = 9l.4031, Y (2) max =77.3508, respectively; and the trough density of the predator and prey are Xmin = Y (1) min = 4.75×10-4, Y(2 )min = 1.7828, respectively. The period of oscillation =4.70

两物种相互作用体系极限环的存在说明两物种出现周期的振荡的消长。极限环的位置标出两物种共存的平衡区域,因此寻找极限环的位置对研究生态平衡有极其重要的意义。本文根据极限环的理论对两物种相互作用生态模型进行环的位置估计,由此来确定Rosenzweig——MacArthur方程的初始值,以便进行数值计算。

The relationships among the growth rate per unit area of leaves,transform ratio of photosynthesis products,photosynthesis ability of leaves and leaf density were fully analyised,and the model of in terspecific competition of plants for light was proposed in this paper.In the model the outcomes of two-,three-,and n-species competition was discussed.Based on the ability tolerating shading of plants and their relative height in community,the pattern partitioning light resource space in plant communities has...

The relationships among the growth rate per unit area of leaves,transform ratio of photosynthesis products,photosynthesis ability of leaves and leaf density were fully analyised,and the model of in terspecific competition of plants for light was proposed in this paper.In the model the outcomes of two-,three-,and n-species competition was discussed.Based on the ability tolerating shading of plants and their relative height in community,the pattern partitioning light resource space in plant communities has been recognized.

本文通过对单位叶面积生长率、光合产物转换、叶面光合能力和叶密度之间函数关系的分析,建立了植物种间光竞争的模型。在此基础上讨论了二个种、三个种及至 n 个种为光资源竞争的结局;根据各植物种由生活型决定的最大生长高度和耐遮荫能力这二个生态学特性,确立了植物群落中光资源空间划分的模式。

The red tide event of 11 ̄28, May in 1987 was caused by Eucampia zoodiacus, a coastal eurythermic phytoplanktou. Results from the field monitoring indicated that during the red tide occurrence the optimal temperature and salinity for the multiplication of the red tide organism were 20 ̄25℃ and 26 ̄28. During the red tide event cell densities in two peak values both reached 3 000×103ind. /din3. Organism number in horizonal distribution increased from the harbour mouth to the inner harbour. Average number of the...

The red tide event of 11 ̄28, May in 1987 was caused by Eucampia zoodiacus, a coastal eurythermic phytoplanktou. Results from the field monitoring indicated that during the red tide occurrence the optimal temperature and salinity for the multiplication of the red tide organism were 20 ̄25℃ and 26 ̄28. During the red tide event cell densities in two peak values both reached 3 000×103ind. /din3. Organism number in horizonal distribution increased from the harbour mouth to the inner harbour. Average number of the organism at the monitoring stations in the inner harbour was 2 930×103 md. /dm3 which was 3. 7 and 61 times higher than that at the two control monitoring stations. The organism number in vertical distribution apparently showed stepwise, day and night changes. Daily change of the phytoplankton number with spring and ebb tides exhibited a negative relativity.Major reasons for this red tide event included species competition of red tide organisms, sudden increment in water temperature in short time, sharp decrement in salinity by rainfall, water eutrophication, high contents of stimulating materials such as Fe and Mn, poor water exchange condition and stable synoptic condition, etc.High content of dissolved oxygen and high pH value was resulted from the photosythesis of a great quantity of the red tide organisms.

AnalysisofthedevelopmentandcausesofformationofEucampiazoodiacusredtideinXiamenHarbor¥ZhangShuijin(ReceivedJune20,1994;accepte...

 
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