species evenness

The average species evenness index ( J ) is 0.14 ;

物种均匀度指数（J）平均值为0.14；

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

初期和成熟期的物种均匀度指数显著高于中期。

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

北京百花山植物群落的物种均匀度与环境的关系

Species evenness index ( J ′) shown no apparent differences among 4 seasons and 3 areas .

种类均匀度指数（J′）在四季节3个区域之间相差不大。

The principal factor affecting the diversity was species evenness of the communities in all kinds of rice types .

均匀度是影响各类型稻田群落多样性的主要因素。

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

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；

And species evenness ( accounted for 70.7-75.9 % of the variation in diversity ) in the late rice .

晚稻季内影响多样性的主要成分是均匀性（占多样性变异的70.7&75.9%）。

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

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。

The results showed that : from north-facing slope to south-facing slope and plain field , the species evenness and diversity index decreased ;

结果表明，当生境由阴坡向滩地到向阳坡变化时，各种α多样性指数的变化顺序为，物种丰富度：滩地>阴坡>阳坡；

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

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 peaks of diversity indices were on the moderate or heavy grazing stages and were related ' to the sPecies evenness increases of . fhe different communities .

多样性指数在中牧或重牧阶段出现峰值，主要缘于群落均匀度的增加。

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 .

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。

Shannon-Weiner index 、 Simpson index and Species evenness index were 2.13 , 0.85 and 0.81 of frigid grassland , which were 1.36 , 0.65 and 0.65 of upland brushy grassland .

高寒草原Shannon-Weiner指数、Simpson多样性指数和均匀度指数分别为2.13、0.85和0.81，山地灌丛草原则最低只有1.36、0.65和0.65。

Shannon-Weiner index and species evenness index of AMF was 0.94 and 0.93 , respectively . The presence of coenocytic hyphae , intercellular hyphae or intracellular hyphal coils , arbuscules , and / or vesicles in the root cortex was used to assign AM fungal colonization .

真菌菌丝团也作为植物营养的储存器，菌丝团消解释放营养供给植株。物种多样性指数和均匀度指数分别为0.94和0.93。

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

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。

Importance of Species Characteristics and Evenness in Different Type Grassland

不同类型高寒草地群落物种特征和均匀度的重要性

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

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。

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

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。

Farmland , spring species diversity , evenness is the highest the lowest number , density and dominance .

在农田，春季种类、多样性、均匀度是最低，数量、密度和优势度最高。

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

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。

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

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。

The results showed that natural plant communities have relatively high index of abundance , species diversity and evenness especially in third stage of succession ;

结果表明：处于植被自然恢复阶段的群落其物种丰富度指数、多样性指数、均匀度指数均在演替的第三阶段较高；

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

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

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。

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

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。

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

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 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 .

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；

Differences of the plant diversity of these three vegetation communities are little , and the species diversity and evenness of steppe community are less than those of arbor and shrub communities .

三种植被群落在植物多样性方面差异并不大，草原群落的物种多样性和群落均匀度要略小于乔木林和灌木林群落。

The diversity was a function of species richness and evenness The main component affecting diversity was species richness ( accounted for 81.7-87.4 % of the variation in diversity ) in the early rice ;

早稻季内影响多样性的主要成分是种类丰富度（占多样性变异的81.7～87.4%）；

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 .

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。