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扩散种群
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  diffusion population
     Persistence and extinction of diffusion populationbeing exploited or predated
     一类受到开发或捕食的扩散种群的持续与灭绝
短句来源
  diffusive population
     Persistant and Extinction Condition of a Diffusive Population being Exploited
     一个受到开发的扩散种群的持续与灭绝条件
短句来源
     Existence of Periodic Solutions for a Diffusive Population Model in a Polluted Environment
     一类污染环境下扩散种群周期解的存在性
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  “扩散种群”译为未确定词的双语例句
     v) The asymptotical behavior of population models with diffusion is studied.
     五、研究了一般的具有周期环境扩散种群模型的渐近性态。
短句来源
     The edge dispersal population has three haplotypes, and shared M6 with other two populations. Its haplotype frequency was 0 108 in the edge dispersal population. M4 and M5 were only found in the edge dispersal population, their frequencies were 0 081 and 0 027 respectively.
     边缘扩散种群有 3种单倍型 ,M6与另两个种群共有 ,单倍型频率为 0 10 8,而M4和M5为其特有 ,单倍型频率分别为 0 0 81和 0 0 2 7。
短句来源
     Asymptotic Property and Persistence of a Class of Population Models with Diffusion
     一类具有扩散种群的持续生存和渐近性
短句来源
     secondly sufficient conditions are established, under which the models admits a positive periodic solution which attracts all positive solutions.
     然后利用单调正、凹算子理论,给出了该扩散种群模型周期解全局吸引的充分条件。
短句来源
     The asymptotic charasteristic of a diffusive,exploited or predated population with the following dynamic model was discussed:
     本文讨论了一类服从Logistic增长规律,且受到开发或捕食的扩散种群动态模型:的渐近性质,得到了具有重要生物学意义的结果.即当开发或捕食率时,种群稳定持续,否则趋于灭绝.
短句来源
  相似匹配句对
     The population diffusing periods are before and after the peak of the hatching period.
     孵化高峰期前后为种群扩散时期。
短句来源
     ~bOPULATION DISPERSAL, SURVIVAL AND DIRECT SEEDING TECHNOLOGY OF MANCHURIAN ASH
     水曲柳的种群扩散、存活和直播技术
短句来源
     were the dominant species.
     为优势种群
短句来源
     Nonlinear Diffusion
     非线性扩散
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     were smaller populations.
     的种群则较小.
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  diffusion population
Semi-discretization in time and numerical convergence of solutions of a nonlinear cross-diffusion population model
      
Finite element approximation of a nonlinear cross-diffusion population model
      
Phase and amplitude instability in delay-diffusion population models
      
Discrete reaction-diffusion population models are analyzed which describe growth and diffusion of a population on a group of islands or a patch environment.
      
This paper presents a study of a nonlinear reaction-diffusion population model in fragmented environments.
      
  diffusive population
We consider a partially coupled diffusive population model in which the state variables represent the densities of the immature and mature population of a single species.
      
Previous models looking at optimal reserve design usually only consider a diffusive population scale movement and dispersal, even though most animal movement is more realistically modelled as being correlated at the individual level.
      


The asymptotic charasteristic of a diffusive,exploited or predated population with the following dynamic model was discussed:

本文讨论了一类服从Logistic增长规律,且受到开发或捕食的扩散种群动态模型:的渐近性质,得到了具有重要生物学意义的结果.即当开发或捕食率时,种群稳定持续,否则趋于灭绝.

On the basis of investigated materials in the plot, the dynamics of edge dispersal of Hippophae rhamnoides subsp. sinensis clone population was studied. Edge dispersal was that the clone population continuously invaded the space outside forest and large gaps in the forest by clonal growth and resulted in a "stair shaped" mosaic system of relatively even-aged tree patches which develop in different stages, i. e. with the increasing of distance of the patches from the largest ramet, the mean age and mean height...

On the basis of investigated materials in the plot, the dynamics of edge dispersal of Hippophae rhamnoides subsp. sinensis clone population was studied. Edge dispersal was that the clone population continuously invaded the space outside forest and large gaps in the forest by clonal growth and resulted in a "stair shaped" mosaic system of relatively even-aged tree patches which develop in different stages, i. e. with the increasing of distance of the patches from the largest ramet, the mean age and mean height of ramets and population biomass decreased, the population density increased with linear function. The system could move forwards at the speed of 1 m/a or the patches shifted their sites each other, which led to the clone population and maintained its stable state in even large area.

以样地调查资料为基础,分析了中国沙棘无性系种群的林缘扩散规律及其生态学意义。结果表明,中国沙棘通过无性系生长向林缘扩散形成"阶梯式"同龄斑块镶嵌体系,群落依靠该体系不断向前移动或者同龄斑块之间的交替更新来维持和恢复其稳定性。同时,林缘扩散种群具有密度大、生产力高等特征,但其生物量积累和自然稀疏过程与有性植物种群具有相同的规律。

Alectoris magna is endemic to China, which distributes in arid region and semi arid zone from western Qinghai, central Gansu to western Ningxia Huizu Autonomous Region. Because of the environmental changes, some populations of A. magna have expanded their range to regions of recent deforestation by humans in southern Gansu, and have colonized to form new edge populations. In this paper the hypervariable domain Ⅰ of the mtDNA control region (D loop) from A. magna populations in edge and central region...

Alectoris magna is endemic to China, which distributes in arid region and semi arid zone from western Qinghai, central Gansu to western Ningxia Huizu Autonomous Region. Because of the environmental changes, some populations of A. magna have expanded their range to regions of recent deforestation by humans in southern Gansu, and have colonized to form new edge populations. In this paper the hypervariable domain Ⅰ of the mtDNA control region (D loop) from A. magna populations in edge and central region was studied. In 39 A. magna samples and five A. chukar outgroups, the entire mtDNA D loop was PCR amplified. The 456-457 nucleotides of the DNA D loop domain Ⅰ have been sequenced by dideoxy chain termination method. The 16 variable sites(3 5% of the entire sequence) defined 15 haplotypes. The edge dispersal population has three haplotypes, and shared M6 with other two populations. Its haplotype frequency was 0 108 in the edge dispersal population. M4 and M5 were only found in the edge dispersal population, their frequencies were 0 081 and 0 027 respectively. The population 1 and population 2 of the central population each had 7 haplotypes, sharing M6. The proportion of haplotype and genetic diversity were 37 5% and 0 594 respectively in the edge dispersal population. In the population 1 and population 2 the proportions of haplotype were 46 7% and 50 0% respectively and the genetic diversity separately 0 729 and 0 786 This result suggested that the edge dispersal population had lower proportions of haplotype and genetic diversity than the two central geographical populations (population 1 and 2).

大石鸡 (Alectorismagna)分布于青海西部、东部 ,甘肃中部和宁夏西部的干旱和半干旱区 ,由于环境变化 ,其种群向甘肃南部森林被砍伐的地区扩散 ,形成边缘种群。本研究采用聚合酶链式反应 (PCR)和直接测序的方法获得了采自甘肃的大石鸡一个边缘种群和两个中心地理种群共 39个个体的线粒体DNA (mtDNA)控制区基因 (D loop) 4 5 6~ 45 7个核苷酸的基因序列 ,16个变异位点 (占整个序列的 3 5 % )有 15个单倍型。边缘扩散种群有 3种单倍型 ,M6与另两个种群共有 ,单倍型频率为 0 10 8,而M4和M5为其特有 ,单倍型频率分别为 0 0 81和 0 0 2 7。边缘种群的单倍型比率和遗传多样性分别为 37 5 %和 0 5 49。中心地理种群 1和种群2各有 7个单倍型 ,除M 6为两个种群共有 ,其余为各自所特有。单倍型比率分别为 46 7%和 5 0 0 % ,遗传多样性分别是 0 72 9和 0 786。边缘种群的单倍型比率和遗传多样性均低于中心地理种群。

 
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