从植物种群水平、植物功能群水平到群落水平，地上生物量的年度间变异性逐渐降低，稳定性逐渐增加。
From population level to functional group level, and then to community level, the yearly-variation of aboveground biomass minimizes gradually and stability increases.
研究了两种群在偏害共生作用下的数学模型，分析了系统各平衡点的稳定性。
This paper deals with the mathematics model of two populations amensalism symbiosis and the stability of all equilibrium points in the system.
林冠下的幼树种群从年龄范围和总体上具有一定的稳定性。
From the age scope and total amount, the species group of seedlings under forest crowns has stability.
讨论了生产者服从草再生模型的三种群食物链系统平衡点的稳定性问题。
The stability of a three species food chain system is discussed, in which the growth of producer is subject to the linear initial regrowth model.
本文研究两种群动力学方程平衡点的稳定性。
In this paper we study the stability for equilibrium points of equations in two-population dynamics.
讨论了一类带有扩散和具有阶段结构与时滞的两种群捕食系统，分析了该系统的非负不变性、边界平衡点性质及全局渐近稳定性。
A system of retarted functional differential equations as a predator-prey model with stage structure and dispersion is discussed. Conditions for global stability of the system are given.
研究了两种群在偏利共生作用下的数学模型，分析了系统各平衡点的稳定性。
This paper deals with the mathematics model of two populations commensalisms symbiosis and the stability of all equilibrium points in the system.
根据两种田鼠种群波动周期性、波动峰值出现的时间以及特定年份峰值的高度等特征，证明两物种波动均具有不稳定性。
Population fluctuations of both species were erratic in respect to annual occurrence, the time of the peak density of fluctuations within years, and the hight of peak the density a given year.
海桑人工种群已经出现某种程度的自然更新和扩散，这将有利于增加海桑人工种群的结构复杂性和稳定性。
Natural regeneration and dispersal of artificial S. caseolaris population had more or less occurred, which may increase the structural complexity and stability of the artificial population.
建立参数自适应律，调整控制系统参数，使天敌-害虫的种群密度渐进的跟踪理想轨迹，保证了该系统的稳定性。
The parameter adaptive law is formed, we adjust the parameters to make sure the density of spruce aphides and their predator track the ideal trajectory, the stability of the system is guaranteed.
本文研究了具有非线性接触率和易感类中具有种群动力学的SIS传染病模型的正不变集、平衡位置以及平衡位置的稳定性。
In this paper, we have studied a SIS epidemiological model with a nonlinear incidence rate and population dynamics in susceptible class.
并以影响品种群体遗传稳定性的四个主要方面论述了该生产程序在保持品种群体遗传稳定和真实性方面的理论。
The theoretic basis of the new seed production procedure to maintain the stability and truthfulness of cultivar populations is analysed from four aspects as well.
构造了一个具有阶段结构的捕食—食饵模型，并研究了庇护所效应对于该系统平衡点的稳定性、平衡密度及其种群长期续存的影响。
This paper studied the effect of prey refuges on the stage-structured predator-prey model with two life stages-immature and mature, and with a mature prey using refuges.
沟谷热带雨林群落结构和功能(光合生产)的稳定性是以多个物种种群以及各层次中个体数量的相对稳定来维持的。
The stability of structure and function (photosynthesis production) of the ravine tropical rain forest is maintained by a lot of tree populations, and relative constancy of individuals in each layer.
由于药剂对蚜虫种群无影响，群落的稳定性易因蚜虫种群的迅速增殖而遭到破坏。
However, because Dimilin had no direct effect on the population of aphis, this stability of insect community was easily disturbed by the rapid increase of aphis population.
第三章将在对顶级捕食者进行脉冲干扰，即周期性的向食物链中投放定量的顶级捕食者的前提下，研究三种群食物链系统的稳定性。
In chapter 3, in this paper, we investigated a three trophic level food chain system with periodic constant impulsive perturbations for top predator.
第三章将在对顶级捕食者进行脉冲干扰，即周期性的向食物链中投放定量的顶级捕食者的前提下，研究三种群食物链系统的稳定性。
In chapter 3, in this paper, we investigated a three trophic level food chain system with periodic constant impulsive perturbations for top predator.
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