species index

At the same time, with the large sapling forest ecosystem is for the research object, bring up the concept of key species that with related the degree of harm sapling, and the calculation formula of key species index and distinguish the standard.

同时，以幼林生态系统为研究对象，提出了与林木危害程度相关的群落关键种的概念以及关键种指数的计算公式和判别标准。

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。

The key species index is the correlation coefficient that the degree of harm sapling and the rodent species density or constitute related analysis.

用林木受害程度与各种群密度或组成比的相关系数作为关键种指数。

Morphologic characters of the seedlings from 20 species of Magnoliaceae were described, and some specimens were made and index which based on the morphologic characteristics such as length of cotyledon petiole, cotyledons folder in endosperm and leaf blade's fold mode in shoot was compiled.

描述了20种木兰科常用绿化植物幼苗，基于子叶柄的长度、子叶在胚乳中折叠方式和幼叶在芽中卷叠方式等特征，编制了分属检索表，并制作标本。

Number of individuals and species, diversity indices, Shannon Wiener diversity index, biomass and soil fertility of the main plant community types in Xiyang River Bend region were analysed.

分析了西阳湾地区主要植物群落类型的种类组成、空间结构、物种多样性、生物量及土壤特性。

Based on data of plots, it was discussed about species richness, Simpson index, Shannon wiener index and Pielou index of the forest communities in Qingcheng mountain of Sichuan province.

以各个植被样地为对象，采用物种丰富度、Simpson指数、Shannon Wiener指数及Pielou指数，研究了青城前山森林植被的物种多样性。

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。

Adopting Shannon-Wiener, the niche breadth index, the article classified constructive species on both slopes into 3 ecologic groups respectively.

本文采用Shannon-Wiener生态位宽度指数将南北坡群落的建群种群分别划分为3个生态类群。

Species turnover ( Cody index ) paralleled patterns of community similarity ( C J )

Cody指数也有类似的趋势,原因在于物种丰富度的变化.

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.

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.