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species dynamics
相关语句
  种群动态
     STABILITY OF A CLASS SINGLE SPECIES DYNAMICS MODEL
     一类单种群动态模型的稳定性
短句来源
  “species dynamics”译为未确定词的双语例句
     Oscillatory and Asymptotic Behaviour of Solutions of Species Dynamics Models
     种群动力学模型解的振动性和渐近性
短句来源
     The Persistence the Species Dynamics System with Diffusion in two Polluted Eviroments
     两毒素环境中具有分离扩散的种群动力系统的持久性
短句来源
     Persistence and global stability of periodic solution for three stage structure single species dynamics system
     三个年龄结构的单种群动力系统持续性与周期解的稳定性(英文)
短句来源
     Effects of vegetation diversity on the occurrence period and species dynamics of insects
     植被多样化对昆虫发生期和物种丰富度动态的影响
短句来源
     In this paper, the plant species dynamics were studied and analyzed, based on two surveys to the three plots in 1982 and 1994. The results showed that order of plant species diversity is broad leaved forest>mixed forest>pine forest.
     本文植物物种动态的研究和分析基于对3个样地在1982年和1994年的两次调查。 结果表明,物种多样性的顺序是阔叶林>混交林>针叶林。
短句来源
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  相似匹配句对
     Two-species metapopulations dynamics models study
     异质的两种群动态模型研究
短句来源
     Population dynamics of endangered plant species Abies chensiensis
     濒危植物秦岭冷杉种群数量动态
短句来源
     The endangered species
     濒危“表亲”知多少
短句来源
     Eight species, D.
     boryanum ,陕甘介蕨D .
短句来源
     METALLOGENIC DYNAMICS
     成矿动力学刍议
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  species dynamics
Information entropy was used to describe the spatial distribution of each species and the fractal dimension of information entropy was used to characterize the complexity of species dynamics across scales.
      
Species dynamics were based on a simple occupancy model, with dispersal simulated as a random walk.
      
Species Dynamics in Disturbed Landscapes: When does a Shifting Habitat Mosaic Enhance Connectivity
      
Five plant functional groups (PFG), representing various combinations of persistence and dispersal character, light requirements and disturbance responses, were defined to model species dynamics.
      
The OUTENIQUA model was tested on its ability to simulate species dynamics of the forest stand used for its development, as well as on independent data from a neighboring stand and not used for the model derivation.
      
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In this paper, author establish a mathematical model for ALLEE EFFECT in single-species dynamics of animals, according to the characteristics of ALLEE EFFECT, and then, study oscillation, boundedness and asymptotic stability of the positive solutions of the model.

本文根据单种群动态ALLEE效应的特点,引入一个适当的数学模型,并对其解的振动性、有界性和渐近稳定性进行了研究。

For long term study, three plots were established in a pine forest, a pine and broad leaved mixed forest and an evergreen broad leaved forest respectively in Dinghu Mountain Biosphere Reserve in 1982. The first forest was subject to human disturbance before the plot was set up and the others have been protected well. In this paper, the plant species dynamics were studied and analyzed, based on two surveys to the three plots in 1982 and 1994. The results showed that order of plant species diversity...

For long term study, three plots were established in a pine forest, a pine and broad leaved mixed forest and an evergreen broad leaved forest respectively in Dinghu Mountain Biosphere Reserve in 1982. The first forest was subject to human disturbance before the plot was set up and the others have been protected well. In this paper, the plant species dynamics were studied and analyzed, based on two surveys to the three plots in 1982 and 1994. The results showed that order of plant species diversity is broad leaved forest>mixed forest>pine forest. For trees(DBH>2.5),species diversity and evenness indices increased from 1982 to 1994 in all the three forests. The differences between two surveys are significant except the broad leaved forest. Because they are developing on advance succession under protection. As for the understory, on contrast, both diversity and evenness indices decreased except in the broad leaved forest. The species richness and individual changes correspond well with the diversity indexes changs. The species composition changes following succession rule. The canopies become closer when the pine forest develops to mixed forest and the later develops to broad leaved forest. Thus more shade tolerant species invade and some sun loving(shade intolerant) species exit. The study supports that human disturbance would decrease plant species diversity and conservation would restore or increase it.

鼎湖山自然保护区于1982年分别在针叶林、针阔叶混交林和常绿阔叶林内建立了3个永久样地。样地建立前,针叶林常受到人类的干扰,其它2种一直受到较好的保护。本文植物物种动态的研究和分析基于对3个样地在1982年和1994年的两次调查。结果表明,物种多样性的顺序是阔叶林>混交林>针叶林。就乔木(DBH>2.5cm)而言,3个样地的物种多样性和均匀度指数从1982年至1994年都已增长。除阔叶林外,两次调查的结果差别很大,这是因为在保护之下它们正产生进展演替。至于林下层植物则正好相反,除阔叶林外,针阔叶混交林和常绿阔叶林的多样性及均匀度指数均下降。物种的丰富度和个体数的变化同多样性指数变化一致。物种的组成变化符合演替规律,随着针叶林发展成为混交林,混交林发展成为阔叶林,其林冠变得较为密集,因而有更多的耐阴植物侵入,而一些喜光(不耐阴的)种消失。研究结果表明,人类的干扰将降低植物的物种多样性,而保护将使物种多样性得到恢复和提高。

Species dynamics in terms of both plant biological traits, ecological strategies and species richness as well as soil chemical variables during a secondary succession in abandoned fields on the Loess Plateau along a temporal sere from 3 a to 149 a were studied. The results indicated that (1) Soil total C and N increased while soil pH, total K and Na decreased with years since abandonment. No noticeable trend was found in the case of soil P along the successional sere. On the other hand, total CaO...

Species dynamics in terms of both plant biological traits, ecological strategies and species richness as well as soil chemical variables during a secondary succession in abandoned fields on the Loess Plateau along a temporal sere from 3 a to 149 a were studied. The results indicated that (1) Soil total C and N increased while soil pH, total K and Na decreased with years since abandonment. No noticeable trend was found in the case of soil P along the successional sere. On the other hand, total CaO of the surface layer (0-10 cm) decreased, but that of the two deeper layers (20-30 cm, 40-50 cm) increased with years since abandonment. Soil C, N, K and P decreased, while Na, CaO and soil pH increased with increasing soil depth. (2) Species richness peaked at both mid_stage of the successional sere and the intermediate portion of soil chemical variables gradient. (3) An ideal dominant species in the early successional stage were annuals with stable seed pool, CR_life strategy, S_regeneration strategy, and strong competitive ability on relatively poor soil, while perennials capable of intensive lateral spread and colonal ability, requiring high nutrient supply, and having C_life strategy would be the dominant species in the subsequent stages. Plant traits, such as perennial_life history, C_, CR_, SC_, SR_, S_ and R_life strategies, W_, S_, Bs_ VBs_ and V_regeneration strategies, were over_represented throughout the whole sere among the other species. (4) Some traits, such as C_, SC_life strategies, ability of clonality, perennial_life history, well_developed lateral spread ability, V_ and VBs_regeneration strategies, seed animal dispersal mode, flowering time of autumn, fruit types of legumen and nut, were more or less correlated with increased soil total C, N and K, while S_, SR_, R_, CR_life strategies, annual_, biannual_life history, non_clonal ability, S_regeneration strategy, poor lateral spread ability, and fruit types of utricle, capsule were associated with increased soil total Na, CaO and pH. The results suggested that steppes should be the dominant native vegetation coinciding with the large_scaled eco_climatic conditions on the Loess Plateau.

在 3~ 14 9年的时间尺度上 ,对黄土高原植被次生演替过程中植物特征和土壤养分元素动态进行了研究。结果表明 :1)随着演替时间尺度的延伸 ,土壤全C、全N含量呈增加趋势 ,而土壤全K、全Na和土壤pH值呈下降趋势 ,土壤全P变化趋势不明显 ;此外 ,表层 (0~ 10cm)土壤CaO含量在演替系列上呈下降趋势 ,深层 (2 0~ 30cm ,4 0~5 0cm)则呈增加趋势。演替过程对几种土壤化学元素含量影响的程度随着土壤深度的增加而减弱。 2 )植物群落物种丰富度在演替的中间阶段最高。 3)在演替的早期阶段 ,植物群落优势种往往具有稳定的土壤种子库、CR_生活对策和S_繁殖对策 ,在贫瘠的土壤上具有较强的竞争能力 ,且具有较强的水平扩展能力和克隆繁殖能力 ,C_生活对策、在土壤全N含量较高的生境中具有较强竞争能力的多年生植物 ,在演替中后期占据群落的优势地位。此外 ,在所涉及的植物特征中 ,多年生生活史 ,C_、CR_、SC_、SR_、S_生活对策 ,以及R_、W_、Bs_、VBs_和V_繁殖对策等特征在非优势物种中出现的频率较高。 4 )C_、SC_生活对策 ,克隆能力 ,多年生生活史 ,水平扩展能力...

在 3~ 14 9年的时间尺度上 ,对黄土高原植被次生演替过程中植物特征和土壤养分元素动态进行了研究。结果表明 :1)随着演替时间尺度的延伸 ,土壤全C、全N含量呈增加趋势 ,而土壤全K、全Na和土壤pH值呈下降趋势 ,土壤全P变化趋势不明显 ;此外 ,表层 (0~ 10cm)土壤CaO含量在演替系列上呈下降趋势 ,深层 (2 0~ 30cm ,4 0~5 0cm)则呈增加趋势。演替过程对几种土壤化学元素含量影响的程度随着土壤深度的增加而减弱。 2 )植物群落物种丰富度在演替的中间阶段最高。 3)在演替的早期阶段 ,植物群落优势种往往具有稳定的土壤种子库、CR_生活对策和S_繁殖对策 ,在贫瘠的土壤上具有较强的竞争能力 ,且具有较强的水平扩展能力和克隆繁殖能力 ,C_生活对策、在土壤全N含量较高的生境中具有较强竞争能力的多年生植物 ,在演替中后期占据群落的优势地位。此外 ,在所涉及的植物特征中 ,多年生生活史 ,C_、CR_、SC_、SR_、S_生活对策 ,以及R_、W_、Bs_、VBs_和V_繁殖对策等特征在非优势物种中出现的频率较高。 4 )C_、SC_生活对策 ,克隆能力 ,多年生生活史 ,水平扩展能力 ,种子的动物传播方式 ,秋季开花 ,荚果、坚果等特征出现的比例在一定程度上与土壤全C、全N和全K含量正相关 ;而S_、SR_、R_、CR_生活对策 ,一、二年生

 
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