查询词典 niche

Otherwise the populations of high niche breadths with the populations of low niche breadths may have more higher niche overlap,whereas low.

另外，高生态位宽度的种群与低生态位宽度的种群可能有较高的重叠值，反之则低。

The values of ecological niche breadths of double dimension and niche overlaps in all kinds of functional groups were not as much as those of single dimension niche, yet natural enemies, in transgenic insect-resistance hybrid poplar 741 could be better adapted to environment than those in control.

各种功能类群的时－空二维生态位宽度和生态位重叠均不如单维生态位宽度和生态位重叠值大，但抗性株系天敌类群对环境的适应性优于对照。

Using the Shannon-Wiener's niche breadth index and the Pianka's niche overlaps index, we found that the Nereis japonica, nemerteans and eelworms had broad niche breadths (above 2.80); the niche overlaps among them was high (above 0.90) in the quantitative analysis on the 21 species present in the quantitative sample analysis.

对定量取样中获得的21个物种以Shannon-Wiener指数为基础进行了生态位宽度测定，以Pianka重叠指数为基础进行了生态位重叠值分析，结果表明日本沙蚕、纽虫和线虫的生态位较宽，均为2.80以上，它们之间的生态重叠值也较高，均为0.90以上。

Fuzzy hypervolume niche was proposed to overcome the limitation of Hutchinson\'s niche concept and the formulas to measure two important indexes—niche width and niche overlap which can be easily applied in practice.

为克服Hutchinson的生态位定义的局限提出了模糊超体积生态位，以及度量生态位的两个重要指标——生态位宽度和生态位重叠，新公式便于应用。

At the recent developmental stage of niche theory,'niche refers to the range of a species' environmental tolerance and requirements. The most popular form to describe niche is the n-dimensional niche hypervolume which was put forward by G.

就目前而言，&生态位&用于指物种对环境的容忍性和要求的范围，而最普遍应用的描述形式是G.E。

The main definitions of niche are the habitat niche of Grinnell (1917), the functional niche of Elton (1933) and the hypervolume niche of Hutchinson (1957) whose concept has by far the largest influence on niche.

生态位是生态学的一个重要概念，许多生态学家都对生态位下了定义，主要有Grinnell(1917)的生境生态位，Elton(1933)的功能生态位，Hutchinson(1957)的超体积生态位，尤以Hutchinson的&超体积生态位&影响为大。

An attractive niche is characterized as follows: The customers in the niche have a distinct set of needs; they will pay a premium to the firm that best satisfies their needs; the niche is not likely to attract other competitors; the nicher gains certain economies through specialization; and the niche has size, profit, and growth potential.

有吸引力的精致市场有如下特征：顾客有截然不同的一系列需要；他们为了更好满足需要愿意支付多一点钱给公司；精致市场不太可能吸引其他竞争者；精致营销者通过专业化获得实惠；精致市场有规模、盈利和成长潜力。

A space series substituting time series method was adapted and Levins niche breadth index and the Pianka Niche overlap index was applied to calculate the resumption of different age and population niche and niche overlap in spring-autumn grassland enclosed for different years at Zhaosu horse ranch.

采用空间序列代替时间序列的方法，运用Levins生态位宽度指数和Pianka生态位重叠指数，对不同围封恢复年限种群生态位及生态位重叠计算分析。

Levins's and Shannon-Wiener niche breadth formula and Pianka's niche overlapping formulae are adopted to quantitatively study the niche breadths and overlapping feathers of major plant species in Malan forest standing in the Loess Plateau as well as analyze the niche patterns of these major plant species following their successions.

应用Levins、Shannon-Wiener生态位宽度公式和Pianka生态位重叠公式，定量研究了黄土高原马栏林区主要植物种的生态位宽度和生态位重叠特征，同时对主要种在演替系列上的生态位变化规律进行了分析。

In order to find the vegetable niche pattern in arid and semi-arid grassland region, the niche breadth and niche overlapping in Yanchi county of Ningxia in 2006 and 2007 are measured by means of Levins niche breadth and Pianka niche overlapping indexes in the enclosed grassland.

运用Levins生态宽度指数及Pianka生态位重叠指数，对宁夏盐池人工封育草原2006年和2007年植物生态位宽度及生态位重叠进行计量，以了解干旱半干旱区草原植物生态位格局。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。