物种均匀度

物种均匀度指数（J）平均值为0.14；

The average species evenness index ( J ) is 0.14 ;

北京百花山植物群落的物种均匀度与环境的关系

Relations in Species Evenness of Plant Communities and Environment in Baihuashan , Beijing

初期和成熟期的物种均匀度指数显著高于中期。

Species evenness in the initial and maturity was significantly higher than in the medium .

乔木层物种均匀度指数在未破坏的栓皮栎林中较高，在恢复25年的栓皮栎林中较低；

Tree species evenness index was higher in original forest stand and lower in forest stands having 25 years of restoration .

物种均匀度指数的较小值多出现在中等海拔群落，但其较大值在各海拔群落都有分布。

The plant communities at middle altitude had lower species evenness indices mostly , but higher values occurred in the plant communites at all altitude .

灌木层物种均匀度指数大于乔木层和草本层，草本层和乔木层均匀度指数在群落梯度上的变异程度大于灌木层。

Species evenness indices of shrub layer were higher than that of both tree and herb layer , and its variations along the community gradient were lower than that of both tree and herb layer .

结果表明：1随着旅游干扰程度的减少，物种的均匀度和综合多样性表现出不断增大的趋势。

It was showed that : ( 1 ) With decrease of tourism disturbance , species evenness and total diversity increase gradually .

用DCA排序研究了黄土丘陵区撂荒地上植物群落演替的趋势和方向，用6种多样性指数分析了物种丰富度、均匀度和综合多样性在演替过程中的变化。

The Detrended Correspondence Analysis ( DCA ) was employed to analyze the trend and direction of plant community succession of abandoned loess land . Seven species diversity indices were used to study the changes in species richness , species evenness and diversity in the succession .

物种丰富度和均匀度均与物种构成上的相似性没有显著相关关系。

Species richness and evenness were unrelated to similarity in species composition .

不同类型高寒草地群落物种特征和均匀度的重要性

Importance of Species Characteristics and Evenness in Different Type Grassland

总群落及各亚群落的多样性指数与物种丰富度、均匀度呈明显正相关。

Their diversity indexes significantly and positively correlated to the species richness and evenness .

放牧干扰是灌木层与草本层物种丰富度与均匀度较低及灌丛难以实现进展演替的主要原因。

The low species richness and evenness , and restricted progressive succession were mainly determined by grazing .

在乔木层，佘山地区广泛分布的混交林群落物种丰富度与均匀度明显高于单优势种群落，林下更新层物种丰富度明显高于乔木层。

In the tree layer , species richness and evenness of the mixed forest are significantly higher than the single dominant species communities .

在内蒙古针茅草原群落中，物种丰富度和均匀度的增加都可以导致时间生态位的分化程度的提高。

Increasing both species richness and species evenness would lead to a high degree of temporal niche partition in Inner Mongolia steppe . 3 .

联合施用高量秸秆及工程菌对根际和非根际土壤微生物群落的物种丰富度和均匀度均有提高作用。

The joint application of high-dose rice straw and engineered bacteria both increased the richness and evenness of the non-rhizosphere or rhizosphere soil microbial communities .

与之相反，施用高量秸秆抑制了非根际土壤微生物群落的物种丰富度和均匀度，提高了根际土壤微生物群落的丰富度和均匀度。

On the contrary , the addition of the high-dose straw reduced the richness and evenness of the non-rhizosphere soil microbial communities and improved the richness and evenness of the rhizosphere soil microbial communities .

土壤含水量和水解氮与乔木层物种丰富度和均匀度相关性明显，有效磷和乔木层均匀度有明显相关；全氮含量和有机质含量与草本层物种的均匀度有明显相关。

Soil water content and available nitrogen had close correlation with the species abundance and evenness of tree layers , available phosphorus was closely correlated with the evenness of tree layers , and total nitrogen and organic matters were closely with species evenness of herb layers ;

就乔木（DBH＞2.5cm）而言，3个样地的物种多样性和均匀度指数从1982年至1994年都已增长。

For trees ( DBH > 2.5 ), species diversity and evenness indices increased from 1982 to 1994 in all the three forests .

分析红豆树（Ormosiahosiei）百年以上老林分的11个乔木层树种的相对优势度、物种多样性、均匀度、生态位宽度、生态位重叠度等指标。

The relative dominant degrees , species diversity , even degrees , niche width , niche overlapping degrees , and other indicators were analyzed by the arbor trees of 11 stories in the hundred-year-old virgin forest of Ormosia hosiei Hemsl . et Wils .

结果表明：随旅游强度增大，物种多样性、均匀度及盖度降低。

The results showed that the species diversity , the degree of homogeneity and the coverage were reduced with the tourism intensity enhancing .

群落乔木层物种多样性、均匀度在增加，生态优势度在降低，群落向着复杂化、多层化方向发展。

The species diversity and evenness of tree layer were increased , the ecological dominance was decreased , and the community became more complicated .

在各栽植密度油松人工林中，各层物种丰富度指数、均匀度指数和多样性指数均表现为灌木层草本层。

Species richness , evenness index and diversity index in the shrub layer were higher than that in the herb layer in the different density plots .

禾草-杂类草半人工草地的物种多样性和均匀度相对于其它样地较低，而优势度和丰富度相对较高；

Species diversity and evenness of plant communities are relatively lower to others , and dominance of communities and richness are relatively high in grass-forb semi-artificial pasture .

物种丰富度指数与均匀度指数并非存在正相关关系，均匀度指数反映的是物种分布的均匀程度，并不反映其物种数量的多少。

The plant species richness index is not positive relevant to species evenness index for which represents the evenness extent of species distribution instead of the quantity of species .

影响人工乔木林和灌木林群落林下草本层物种多样性和均匀度指数变化的主要因素有植物物种种源、植物自身因素（初植密度）和人为因素（破坏、放牧时间）。

The main factors influencing indexes of the diversity and the evenness of herb layer under the artificial arbor and herb are species source , plants ' own factor ( plant density ) and human factor ( destroying , grazing and time ) .

研究结果表明，天然灌木林群落物种多样性和均匀度指数最大，天然草本群落与人工乔木林群落接近，人工灌木林群落最小；

The results showed that as to the indexes of diversity and evenness , natural bush community has the highest ones , and artificial arbor community has no significant difference with the natural herb community , and artificial bush community has the lowest indexes of diversity and evenness .

研究区内具有相同生态配置模式的恢复治理模式具有相近的物种多样性、物种均匀度和优势度指数。

In the study area , the recovery models which had the same ecological configuration mode , had similar species diversity index , species evenness index and dominance index .

群落多样性指数的高低主要受物种数量和各物种数量均匀度的影响。

The diversity index was mainly affected by the number of bird species and evenness of population number among species .

并对以苍山为主体的山地各主要生态环境蚤类的群落结构、物种丰富度、物种多样性、均匀度和生态优势度进行了测定和比较。

The species diversity , evenness and ecological dominance indices of fleas communities in 7 main ecological environments were measured and compared .

文中对各小兽群落结构、物种丰富度、物种多样性，均匀度和生态优势进行了测定和比较，认为群落稳定性最高是针阔叶混交林，而最低是农耕区。

Community structure , species diversity , evenness and ecological dominance indices of the small mammals communities were measured and compared . Stability of small mammals communities was the highest in the coniferous and broadleaf mixed forest and the lowest in cultivated area .