查询词典 species diversity

Avian ; Avifauna ; Group diversity ; Species diversity ; Three Gorges Reservoir

鸟类；区系；类群多样性；物种多样性；三峡库区

Tree species diversity in the secondary forest was significantly lower than that in montane moist evergreen broadleaved forest at climax stage as compared by Shannon-wiener index, Simpson's diversity index, and Fisher's index.

以Shannon-Wiener指数H、Simpson指数D和Fisher指数α计算了栎类次生林的树种多样性(H=1.42±0.27；D=0.65±0.09；α=2.59±1.16)，并与中山湿性常绿阔叶林的树种多样性进行了比较，结果显示处於演替顶级阶段的中山湿性常绿阔叶林具有更高的树种多样性。

I have calculated the species diversity for 3 layers (i.e. tree layer, shrub layer and herb layer) by means of various biodiversity index formulas and analyzed the relative species abundance using 9 models of the probability density distribution functions, such as, 3 Distribution (or Beta Distribution, Weibull Distribution, Lognormal Distribution, Poisson Distribution, Binomial Distribution, Negative Binomial Distribution ,Geometric Distribution, etc.. chi-square analyses were conducted on species distribution by using the chi-square test formulated by Pearson to test which distribution function is better, the result of chi square test made it possible to reject the other 8 distribution functions, theβdistribution function performs better than other probability density functions, it has a very close approximation, which can be used for the description of relative abundances of species in forest communities in this data set.

在相对多度研究上选用了九种概率分布模型，这九种概率密度分布函数依次为：贝塔分布、Weibull分布、对数正态分布、泊松分布、二项分布、负二项分布、几何分布、对数分布和奈曼A型分布，并进行了严格的卡方检验，结果表明：其它八种分布均被遭到拒绝，只有贝塔分布获得了通过，且拟合的结果非常理想。

But the species diversity has no significant correlation with the minimum distance to source area. This suggests that immigration and recolonization for Raniformes species have hardly occurred on Zhoushan archipelago after the islands were formed, and the species number on the islands is under the "non equilibrium" status.

但物种多样性与离物种源的最小距离没有显著相关性，这说明岛屿形成后蛙类在岛屿间很少发生迁移和再定居，物种数处于"非平衡"状态。

Species diversity ; avian species richness ; mammalian species richness ; zoogeography ; nature reserve

物种多样性；鸟类物种丰富度；兽类物种丰富度；动物地理；自然保护区

The relationship between weed invasion and intensity was analysed on sown pasture mixed by whiteclover and perennial ryegrass,and the preliminary results were that 1the number of invasive weeds ismainly dependent on grazing intensity;2the trend of species diversity was successively increase-decrease-increase when the grazing intensity is increase;3 principal invasion weed species are Lysimachiahemsleyana, Eragrostis nigra, etc,8 species;4the sown pasture in question is pioneer stage of the recoverysucce...

本文分析了白三叶草十多年生黑麦草混播人工草地上杂草入侵与放牧强度之间的关系，得出如下初步结论：1）杂草入侵的种数主要决定于放牧强度；2）α物种多样性随放牧加重而有增－减－增的趋势；3）入侵的主要杂草种为点腺过路黄等8个种；4）所论人工草地都处在恢复演替的先锋阶段，因而草地退化的进程还是能予以遏制的。

The diversity of LH08 station was the lowest, and the diversity difference of every station was significant. The analysis on species diversity index and advantage curve showed that community structure of zoobenthos on every station was less effected, indicating that the sea area was on mild artificial disturbance status.

位于港池的LH08站多样性最低，各站位的多样性差异显著；物种多样性指数和K-优势曲线的分析显示，各站位的底栖动物群落结构没有受到较大影响，表明该海域处于轻度人为扰动的状态。

Results on the effects of grazing by sheep on species and functional group diversities had not led to consensus in different communities: species richness, species diversity, diversities of life forms and water ecological type groups decreased with grazing intensity increased except in the Leymus chinensis + forbs community.

放牧对4种群落物种和功能群多样性的影响随不同的群落而表现不同：物种丰富度、物种多样性、生活型多样性和水分生态类型多样性除羊草杂类草群落外随放牧强度的加大而降低，但适度放牧增加了羊草杂类草群落的上述多样性指标。

The number of species, species diversity and G-F index in the primary forest are the highest. The birds in that community has more species, families and genus, but the number is less.

原生林的鸟类物种数、物种多样性及G-F指数最高，该群落的鸟类在物种和科属水平上拥有最高的多样性，但是个体数量较少。

More than half of Southeast Asia's coral species diversity is found in the South China Sea. 75 species of sponges and 118 species of echinoderms in the South China Sea are endemic. The reefs ecosystem is known to provide ecological goods and services.

东南亚的珊瑚种类有超过一半的分布在南中国海，75种的海绵以及118种的棘皮类动物属于南中国海的地方特有种。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。