密度制约

具有时滞和密度制约的两种群相互作用模型的稳定性

Stability of two species interactions model with time delay and density dependence

密度制约被认为是一种重要的维持森林物种多样性机制。

Density dependence was considered as an important mechanism to maintain high species diversity in forest .

两种群都不靠食其他种群为生，互惠共存，且有一种群如N2为密度制约的。

Two species , both of which do not feed on other species and one of which is density dependent , are mutualistic .

具有密度制约的Volterra模型的全局结构

The overall structure of Volterra model with defined density

一类捕食者具有密度制约的KOLMOGOROV系统极限环的存在性

Existence of a limit cycles for a Kolmogorov systems with density-dependent predators

本文研究了两类具有种群密度制约接触率的SIR流行病模型，其生态学结构分别为常数输入和Logistic出生。

Two SIR type epidemic models with population size dependent contact rate are analyzed . The demographic structures considered here are recruitment and logistic birth , respectively .

双密度制约的HollingⅡ型捕食动力系统的定性分析

Qualitative Analysis of Holling Type 's Predator-Prey Dynamic System with Double Density Restrict

密度制约竞争二种群Volterra方程解的有界性及参数估计

Boundedness of the solution of Volterra differential equations of two density dependent populations in competition and estimation of parameters in the equations

具有非线性密度制约的HollingⅡ类功能性反应的食饵与捕食者模型的定性分析

Qualitative analysis for a kind of predator-prey model of Holling ⅱ - function response with nonlinear density dependent

密度制约的HollingⅢ型捕食动力系统极限环的存在惟一性

Existence and uniqueness of limit cycle for Holling 's type ⅲ predator-prey dynamic system with double density restriction

结果表明，对照和UVB处理时小麦和野燕麦的密度制约死亡规律没有显著差异，相对较大的竞争压力加强了UVB对这两个物种生物量降低的效应。

The density dependent mortality of both wheat and wild oat did not exhibit a significant difference between control and UV B treatments .

基于这一现实背景，本文讨论了一类捕食种群和被捕食种群都有密度制约和HollingⅡ型功能性反应的捕食-被捕食系统。

Recognize the reality , in this paper , we investigate a mathematical model of a predator-prey system in which both predator and prey have their respective carry capacities and have a functional response of Holling type II .

具有密度制约作用的森林系统的半群解

The Semigroup Solution of a Forest Evolution System with Density Effect

植物群落物种共存机制：负密度制约假说

A mechanism of plant species coexistence : the negative density-dependent hypothesis

具有非线性密度制约的一类微分生态系统的定性分析

Qualitative Analysis of A Kind of Differential Ecosystem With Nonlinear Density Restriction

千岛湖蓝藻密度制约因素分析

Research on Restricted Factors of Cyanophyceae density In Qian-dao Lake

种群个体在植株内垂直分布的种群聚集度也是逆密度制约型。

Within-pine-tree vertical distribution also follows inverse density-dependent aggregation .

老芒麦种群密度制约特性初探

Characteristic investigation on community density restrain of Elymus sibiricus

并且竹笋的死亡率是非密度制约的。

Furthermore , shoot mortality was density independent .

没有必要认为密度制约因素具有任何特殊的重要性。

There is no need to regard density-dependent factors as having any special importance .

两次分析皆表明：赤狐数量趋势的波动为随机波动，波动中赤狐种群的密度制约因素影响不明显。

Among causes which effected fluctuations the density of Red fox was not main factor .

可能，在某物种的分布区的边缘，非密度制约因素最为重要。

Probably density-independent factors are more important at the edge of the range of a species .

分株高度和生物量及其分配无严格的密度制约规律。

There was no strict rule of density dependence on ramet height , biomass and its allocation .

第一部分从不同角度对企业集群和密度制约理论的研究进行了汇总。

Chapter 1 sums up previous research on theories about business cluster and density restricting from various sides .

食饵种群具有密度制约的第Ⅳ类功能性反应捕食&被捕食系统的定性分析

The Qualitative Analysis of a Predator-prey System in Which Prey has Density Dependence with Holling Type - ⅳ Functional Response

本系统考虑了具有一般性密度制约的食饵种群对染病的捕食者种群的影响。

This system considers that the prey population with general density restriction affects the predator population which catches an illness .

扩散原因是由于环境因素且由非密度制约因素引起的。

Analysis of dispersal reasons showed that the dispersion was brought about by environment elements , especially by density independence factors .

对种群内部密度制约过程与诸如环境变异性等外部因子交互作用的检验正在成为哺乳动物种群系统生态学领域关注的论题。

Recently , this has led to growing interest in how internal processes such as density-dependent interact with external factors such as environmental variability .

另外，群落谱系结构研究还有助于探讨中性理论、密度制约假说等生态学理论，并预测干扰作用下的群落演化趋势。

Phylogenetic information also indicates the influence of environmental factors and studying community phylogeny at the metacommunity level helps to understand regional ecological processes .

在天然条件下，影响鱯鱼鳋种群消长的主要因素是非密度制约因素和大鳍鱯的免疫反应。

In natural environment , the factors influencing the population growth of the parasite are density of independent factors and immunological responses generated by the host .