查询词典 species diversity

Gloydius which belong to Viperidae Crotalinae is a colony of advanced viper.Their live environments are diversiform: jokuls, altiplanos, hills and plains. Gloydius isa group has highly differentiation and in a phase of radialization evolution, even thedifferent colonies of same species have diversity in morphologic and gene level. Chinahas abundant Gloydius, but the genetic diversity and their distribution pattern are littleresearched.

亚洲蝮属隶属于蝰科、蝮亚科，是一类高等的毒蛇，其分布范围广泛且生境差异较大，从雪山、高原、丘陵至平原，是一个高度分化、适应多种环境条件的类群，且尚处于辐射进化阶段，甚至同一物种的不同地理种群已表现出明显的形态和基因水平的差异。

The diversity index of soil dematiaceous hyphomycetes was the highest but the evenness was lower in town-oasis, whereas in desert and gobi the diversity index was obviously lower, and the species evenness was higher.

在小镇-绿洲生境中，土壤暗色丝孢菌的Shannon-Wiener多样性指数最高，均匀度较低；而在沙漠和戈壁生境中多样性指数明显较低，而物种的均匀度较高。

On the other side, the relations among community classification, structure, diversity and distribution pattern were also investigated through the study of species composition, diversity and interspecific relation of Medicago falcata in Inner Mongolia.

另一方面，本文又以松嫩平原天然草地中的五脉山黎豆、多茎野豌豆、花苜蓿以及内蒙古的黄花苜蓿为研究对象，从植物群落的物种组成、多样性、种间关联等几方面探讨了我国天然草地中豆科牧草的群落类型、结构、群落多样性与分布格局之间的关系。

The surveyed results show that as compared to the uncovered vegetation area, the existence of soil microbiotic crusts in the Tengger Desert region significantly increases the diversity and abundance of insect species, especially the diversity and abundance in the quadrats mainly covered by moss and lichen crusts are significantly higher than those in the quadrats mainly covered by cyanobacteria and algal crusts.

结果表明：与无结皮覆盖的植被区相比，生物土壤结皮在地表的覆盖显著地增加了昆虫的多样性和种的丰富度，其中以苔藓和地衣为主的结皮覆盖的植被样方中昆虫种的多样性和丰富度显著地高于以蓝藻和藻类为主的结皮样方。

The birds of Passeriformes have more important contribution to the group diversity in the Three Gorges Reservoir. Zigui County has the maximal family diversity,while Badong County has the upmost species composition.

类群多样性分析显示，以中小型鸟类为主的雀形目鸟类对三峡库区鸟类多样性贡献最大，秭归具有最大的类群多样性，而巴东则具有最多的物种数。

With the study of temporal-spatial distribution of siol microbial diversity,we found species richness index,diversity index and evenness index had a falling trend,and the downtrend was slighly different.

在研究土壤微生物的时空分布中发现，土壤微生物现物种丰富度指数、多样性指数、和均匀度指数随海拔升高，都呈缓慢下降趋势，并且在不同地区下降趋势略有差别。

The results of POPGENE analyze indicated that it was moderate level of the genetic diversity of Dipelta, mean PPB (percentage of polymorphic bands) h and I of 4 species of Dipelta as below: D.wenxianensis.(PPB=62.02%,h=0.1850,I=0.2826); D.yunnanensis (PPB=40.31%, h=0.1238, I=0.1874); D. floribunda (PPB=36.82%, h=0.1395,I=0.2045); D. elegans (PPB=15.51%, h=0.0583,I=0.0861). Genetic diversity in D.elegans is the lowest. It is possibly caused by the endemic distribution and local ecotope.

POPGENE分析结果表明，文县双盾木的多态位点百分率平均为62.02%，Nei&s基因多样性指数平均为0.1850，Shannon&s信息指数平均为0.2826；云南双盾木的PPB平均为40.31%；h值平均为0.1238；I值平均为0.1874；双盾木两个居群的PPB平均为36.82%；h值平均为0.1395；I值平均为0.2045；优美双盾木两个居群的PPB平均为15.51%，h值平均为0.0583；I值平均为0.0861；因此，我们认为双盾木属4个种的遗传多样性适中；而优美双盾木由于分布上的地理限制，居群的生境比较孤立，其遗传多样性较低。

The results showed that the Shannon-wiener diversity index of forest plant species increased with the increase of the environmental gradient, and the β-diversity indexes of communities showed a liner increase along with the change of environmental gradient.

结果表明：Shannon-Wiener多样性指数随环境梯度的增大而增大，并且β多样性指数与环境梯度呈线性增加的趋势。

We show that over timescales ranging from 500～10000 years, allele frequency data for polymorphic allozymes reveal a consistent loss of genetic diversity along invasion routes, confirming the role of glacial refugia as centres of genetic diversity over these timescales, and that populations in the invaded range are more subdivided genetically than those in the native range of each species.

从500～10 000年的时间尺度上，多态的等位酶位点上等位基因频率的数据表明：1）遗传多样性沿入侵路线呈不断下降的趋势，支持了冰河期避难所作为遗传多样性中心的作用；2）入侵地区的种群与该物种原产地的种群相比，遗传上的分化更为强烈。

The results showed that the species richness,the speciesdiversity and its biomass of understorey vegetation decreased with the stand age in-creasing.There was the most significant negative-linear relationship between thiskind of changes and age.It is possible that the certain shading condition may benefit to understorey growing better.The richness,diversity index and biomass of thevegetation in eucalypt plantation decreased with CPR increasing,however,after ro-tating by watermelon one rotation,the richness,the diversity index and biomass ofunderstorey in CP stand increased,this result will provide the possibility of therestoration and reestablishment of vegetation in eucalypt plantations.The nutrientstorage of understorey decreased in accord with the productivity decreased withCPR increasing,this is the result which the stand enviroment became worse and thestand stratum competed with the vegetation for the water and fertility of soil.

结果表明，随着年龄的增长，桉树林下植被物种丰富度降低，多样性减少，生物量下降，这种变化趋势与年龄存在极显著的负线性关系；随着造林密度的增加物种丰富度降低，多样性也下降，但林下植被生物量尚有增加，可能是一定程度的庇荫有利于桉树林下植被的生长；随连栽代次的增加，桉树林下植被丰富度降低，多样性指数下降，生物量减少；但在轮作一茬西瓜后的林地，物种丰富度提高，多样性指数升高，生物量增加，为桉树林下植被的恢复与重建提供了可能性；随连栽代次增加，林下植被养分总量逐代下降，与生产力下降一致，这是林分环境恶化后上层乔木和林下植被对水肥竞争的结果。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。