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niche
相关语句
  生态位
    ON THE DEFINITION OF NICHE AND THE IMPROVED FORMULA FOR MEASURING NICHE OVERLAP
    关于生态位定义的探讨及生态位重叠计测公式改进的研究
短句来源
    Study on the Niche Characteristics of Main Tree Populations in Tropical Mountain Rain Forest
    海南岛尖峰岭热带山地雨林主要种群生态位特征研究
短句来源
    APPROACH OF LAND CLASSIFICATION WITH SPATIAL NICHE OF MAIN TYPES OF SECONDARY FORESTS
    次生林主要类型生态位土地分类方法
短句来源
    Study on the Niche of Masson Pine Community in Northern Fujian
    福建北部马尾松群落生态位的研究
短句来源
    Niche dynamics of Castanopsis fargesii population.
    栲树种群生态位动态研究
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  “niche”译为未确定词的双语例句
    Through comparing the differences and changes of the niche factors in different disturbed plots, then comparing the ecophysiological indexes (Pn-PFD curve, daily photosynthesis rates, daily transpiration rates etc.)
    通过比较不同干扰样地中各生境因子的差异和变化,进而对不同干扰背景下各优势种幼苗幼树的Pn-PFD曲线、光合作用速率日进程、蒸腾作用速率日进程等生理生态指标进行比较。
短句来源
    For the 20 shrub species,98 pairs have niche overlapping among total 226 pairs,accounting for 43%.
    20种灌木有226个种对,98个种对有重叠,占43%。
短句来源
    (4) Ecological niche variation of arthropod community in transgenic insect-resistalhybrid poplar 741 standsThe spatial niche breadth of target pests was least, the niche breadths of otherfunctional groups were wide.
    转双抗虫基因 74杨节肢动物群落的主要影响因子与对照有明显区别不同抗性株系与对照 74杨节肢动物群落的发生发展亦不相同,转双抗虫基因 74杨节肢动物群落生态兔疫力较好,因而在制定害虫综合治理策略和途径上宣采取与对照 74杨不同的措施,抗性株系应以生态调控为主。
短句来源
    The community characteristics, size structure, spatial distribution pattern, species richness, interspecific associations and the niche features were analyzed in the article.
    方法,对白豆杉种群的大小级结构、分布格局及所在群落的群落特征、物种多样
短句来源
    After the calculation of the relative density, relative frequency and relative dominance, the importance value of the species was calculated. The importance of the species in the niche was judged by the important value.
    据所调查的数据计算出不同生境各个树种的相对密度、相对频度、相对优势度及重要值,根据重要值的大小来判断该种群在该生境中的地位和作用。
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  niche
Root Ecological Niche Index and Root Distribution Characteristics of Artificial Phytocommunities in Rehabilitated Fields
      
The ecological niche that roots occupy, their abundance and distribution, and the factors that affect them must be acknowledged.
      
In the first instance therefore, a new method to calculate the root ecological niche index (RENI) is proposed, embracing the entire phytocommunity of plantations.
      
Niche of insect borers within Pinus massoniana infected by pine wood nematode
      
The niche width, proportional similarity of niche and the niche overlap of dominant species of dying trees were computed.
      
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In this paper, various definitions of niche are reviewed by using the theory of set and mapping, and a new niche definition containing both relationships between species and environmental factors and population dynamics models has been suggested. The mathematical expression of this definition is Ac En|→B E1, where A is set which expresses the attribute of environment and set B expresses the attribute of species.Niche overlap is defined as an ecological similarity between two species, and thereby...

In this paper, various definitions of niche are reviewed by using the theory of set and mapping, and a new niche definition containing both relationships between species and environmental factors and population dynamics models has been suggested. The mathematical expression of this definition is Ac En|→B E1, where A is set which expresses the attribute of environment and set B expresses the attribute of species.Niche overlap is defined as an ecological similarity between two species, and thereby the improved formula for measuring niche overlap has been deduced. The Improved formula is compared with the formulas of similarity percentage, Levins' formula and Pianka's formula. Two advantages of the improved formula have been pointed out in the paper.

本文分析了有关生态位的种种定义,总结了它们之间本质上的共同点,并应用集合映射的理论,提出了一个既包括种与环境因子之间的关系,又包括种群动态模型的生态位定义。将生态位重叠定义为两个种在生态学上的相似性,继而推导出计测生态位重叠的改进公式。利用实例将改进公式与目前通用的相似百分数公式、Levins公式、Pianka公式等进行了比较,指出改进公式优于通用公式的两个特点,

The relative dominance of Populus davididnd, Betula japonica,Quercus liaotungensis and pinus tabulaefomis in different forest communities has been used as measurment of niche overlap. The base area of dominant plant population in regular pure forest has been regarded as its enviromental capacity. By using the competition equation of Lotka-Volterra the result of competition among dominant plant populations in Huanglong Mountain of North Shaanxi Province reflects well the state of succession of plant communities...

The relative dominance of Populus davididnd, Betula japonica,Quercus liaotungensis and pinus tabulaefomis in different forest communities has been used as measurment of niche overlap. The base area of dominant plant population in regular pure forest has been regarded as its enviromental capacity. By using the competition equation of Lotka-Volterra the result of competition among dominant plant populations in Huanglong Mountain of North Shaanxi Province reflects well the state of succession of plant communities in this region.

以山杨、白桦、辽东栎和油松在不同群落中的相对显著度作为生态位重叠的计重,以优势植物种群在正常纯林中的基面积作为它的容纳量,应用Lotka-Volterra竞争方程,描述了陕北黄龙山优势植物种群间的竞争结局,较真实地反映了该地区植物群落的演替情况。

From May to July in 1986, 1987, we studied secondary forest bird community in Yilan of Heilongjiang Province. Bird community of the forest consists of 21 speeies of birds. Based on the foraging behavior patterns determined by the foraging method, foraging substrate, foraging position and foraging height of the birds foraging, this bird community is distinguished into five guild using cluster analysis and principal components analysis. In cluster analysis, species birds were divided into 5 guild:(1). gleaner...

From May to July in 1986, 1987, we studied secondary forest bird community in Yilan of Heilongjiang Province. Bird community of the forest consists of 21 speeies of birds. Based on the foraging behavior patterns determined by the foraging method, foraging substrate, foraging position and foraging height of the birds foraging, this bird community is distinguished into five guild using cluster analysis and principal components analysis. In cluster analysis, species birds were divided into 5 guild:(1). gleaner in upper stratum of tree crown;(2). gleaner in lower statum of tree crown; (3). sallyer in Upper stratum of tree; (4). gleaner in ground;(5). trunk gleaner. The foraging behavior patterns of guild members are very similar, it is appropriate to study competive interactions resource partitioning within a guild framework.The comparison on foraging behavior of upper and lower guild indicated that was a relative generalizational guild. Its niche breadth and overlap on all foraging category were larger, and trunk gleaner were relative specializational guild. These guild foraging were limited in specific site. This study showed that key factor is interspecific resource utilization On organization of bird community in this environment, This community pattern indicated that resouce utilization and partition pattern.

本文是1986年5—7月和1987年5—7月在黑龙江省依兰县先锋林场对山地次生阔叶林鸟类观察整理而成的。在20ha的样地内,对21种鸟类进行了8756次观察,主要记录其取食方式、取食位置、取食基质和取食高度等四个取食类型的22个变量。将观察结果变换21×22的矩阵,在Casio-PB700微机上进行主分量分析和聚类分析。主分量分析表明,取食方式和取食位置是构成山地次生林鸟类群落集团最重要的因素,它们二者在群落中的生态位宽度和生态位重叠居各取食类型中最小,因而也是群落中两个分离最大的因素。聚类分析将21种鸟划分成5个取食集团。东北地区鸟类群落有明显的季节性,年与年之间资源波动,使特化者和泛化者处于不同的优势水平。取食类型的分离,分割了这一地区的资源,使竞争减至最小。群落不是由于竞争而存在,而是由于对资源的分割而共存的。

 
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