species diversity index

Arthropods communities were extremely significant difference among the tree layer, shrub layer, herbaceous layer and leaf litter layer, the individual number, species number, species diversity and evenness index of Arthropods were the maximum in herbaceous layer.

节肢动物群落在林冠层、灌木层、草间层和枯落物层4个垂直层次之间有极显著差异，草间层具有最高的物种数、个体数、多样性指数和均匀度指数。

The structure of grasshopper community in different environment in Luo River region was compared using species-abundance model, diversity index, similarity analysis, principal component analysis and stepwise regression.

应用种-多度分布模型、多样性指数、相似性分析、主成分（PCA）分析及多元逐步回归等方法比较了洛河流域不同生境的蝗虫群落结构。

The undergrowth vegetation species diversity index of Simpson index, Pielou evenness index and species richness index are all improved after the management measures take in to implementation.

封禁后各项经营措施下的林下植被的Simpson物种多样性指数、Pielou均匀度指数和物种丰富度指数都有所提高。

The species diversity index of the tree layer and the shrub layer reach its peak in the range of 1000-1200m elevation, the species diversity index decrease below or above this altitude range.

植物群落乔木层和其灌木层的物种多样性，在海拔1000-1200m范围达到峰值，低于或高于这一海拔范围时，物种多样性指数均逐渐降低。

The mainly investigated contents were as follows: ( 1) Species diversity analysis: Species richness, Brillouin index of species diversity and even degree.

主要研究内容包括：①植物物种多样性：不同植被群落的物种丰富度（S）、多样性指数（H）和均匀度（J）；

The seasonal ecological features of phytoplankton community including its species composition, population size, dominant species, saprobic indicator, diversity index and diatom biotic index were preliminarily studied at 22 sampling stations in the Chaohu Lake, Anhui Province.

对巢湖浮游植物在22个样点，四季采样，进行了种类组成、种群数量、优势种、污染指示种，多样性指数及硅藻指数等群落生态学的初步研究。

Both the species richness index and diversity index of the community were low.

群落物种丰富度和多样性指数低.

Spatial diversity index was cited to describe the wild life habitat pattern quantitatively. And the habitat pattern change of wild animals and red-crowned cranes ( Grus japonensis), as indicator species, between 1988 and 1998 was analyzed.

引用空间多样性指数（S d）对本区野生动物生境格局和指示物种丹顶鹤的生境格局进行了定量描述，并分析了其十年间的生境格局变化。

2, In the core-zone of 0.3 moisture isohyet, the relative change rate and fluctuation variance for both the number of individuals and biomass among different sampling plots varied west-east to the adjacent area significantly. There was an increasing trend in species diversity index.

2）0.3线的核心区不同样方向个体数和生物量向相邻区的相对变化率（0.42，0.56）与波动方差都很显著，物种多样性指数有增大的趋势。

The louse communities on small mammal hosts are quite simple with lower species richness and diversity and with a high dominance index.

各小兽宿主体表吸虱群落简单，物种丰富度和生物多样性均很低，大多数优势虱种的相对优势度很高，优势种地位突出。

Along with altitude increasing, predominant index generally increases, but species diversity index and evenness index decrease.

随海拔升高, 优势度指数普遍递增, 物种多样性指数和均匀度指数递减.

The result of the research showed that the species number has a slight change over 30 years in the fragment, while the index of species diversity decreases by 24%.

结果表明，该片断森林经30多年的演化，物种数变化不大，但物种多样性指数降低24%。