多样性

Vallisneria spinulosa maintained high levels of genetic variation both at the species and at the population level. Partitioning of genetic diversity revealed a surprisingly low population differentiation as compared to other hydrophilous angiosperms.

利用等位酶和开发的微卫星标记研究了刺苦草在长江中下流域的遗传多样性和遗传结构，研究结果表明，刺苦草在居群水平和种水平都具有高的遗传多样性；居群间遗传分化程度非常小；居群间历史上存在长距离基因流。

For thecrystal in MeOH, X-ray single-crystal analysis reveals that each Schiff base provideone iminic N, one phenolic O and one hydroxylic O to chelate the four Cu andthus resulted in a pseudo-cubane structure. Different from the crystal obtained inMeOH, each Cu are tetra-coordinated not penta-coordinated.

充分证明了所设计的Schiff碱配体是一种桥联配体，不仅在配位形式上有多样性，而且在晶体排列方面也应具有多样性，是构建具有新颖物化性质及结构的超分子聚集体的良好前体。

The population dominance index, Shannon-Wiener index, evenness, niche breadth and community similarity were used to analyze the diversity and eco-niche of soil moniliaceous hyphomycetes in five ecosystem-types.

利用种群优势度、Shannon-Wiener多样性指数、均匀度、生态位宽度、群落相似性等指标对该地区不同生境的土壤淡色丝孢菌物种的生态多样性及物种生态位进行了分析。

The comparative study on vegetation background survey of the stationsand the comparison on level of phytocoenology on zonal habitats indicates thatthe diminishment of the numbers of families,genus and species,compositionof life types,diversity of communities and habitats,;and the increscence in theproportion of photosynthesis functional groups of C3/C4 plant,richness ofspecies,density of tussock and tiller,diversity of species,evenness,leaf areaindex,leaf area duration,dry matter production of communities alongside thelatitude increasing and the temperature decreasing;and the dynamic curve ofthe community productivity also tend to steadily increase along with thetemperature going up and the heat accumulation gradually in moderate-temperate steppe station from violent fluctuation along with seasonal badly-distribution of precipitation in warm-temperature steppe station;manifestingthat transformable tendency of productivity pattern of the community from morevigorous net assimilation,sparser and higher crops stricture of tussock and tiller,and possession on more resources by less species inclined to thicker in densityof crops,superior effectiveness of multi-leaves and pattern of multi-speciesresource sharing,reflecting that bigger disparity of the vegetationcharacteristics and the style of the community growth in the two differentthermal-type steppe stations owing to background of natural-historicenvironment and combination of water and heat.

内蒙古草原区两个不同热量型研究站点植被本底调查和显域地境群落学水平的比较研究表明：随纬度增加和气温降低，植物科、属、种的数目，生活型组成，群落类型和生境类型的多样性均趋于减少，而C3/C4光合功能群比值和群落的物种丰富度，株丛密度，物种多样性，群落均匀度，叶面积指数，叶面积持续时间和群落干物质生产能力均趋于增加，群落生产力动态曲线从随天然降水的季节分布不均而剧烈波动趋向于随气温逐渐升高和热量逐步积累而稳定增长，显示出两站点植物群落从较为旺盛的群体净同化作用、较为稀疏高大的群体结构和少数物种占有较多群落资源的生产力格局向较高的群体密度、优良的多叶性能和多物种资源共享的群落生产力格局转变，反映出在内蒙古草原区不同的自然历史环境背景和不同的温度条件及其水热组合状况影响下，两个不同热量型草原站点植被性质的分异特征和显域地境群落生长模式的较大差别。

Community structure of soil nematode changed little with altitude, and soil organic matters were mainly decomposed by fungi. Among the three vegetations including sparse shrubland, semiwet indeciduous broad-leaved trees and wet indeciduous broad-leaved trees, there are significant differences in Shannon's diversity index, Simpson's dominance and diversity index among different communities.

成熟指数值表明，高黎贡山土壤线虫群落结构较稳定；线虫通路比值计算表明，土壤有机质主要依靠真菌分解途径；Shannon-Wiener多样性指数、Simpson优势度和多群落间比较多样性指数在低海拔的灌丛林与半湿润常绿阔叶林和中山湿性阔叶林有显著差异。

Furthermore, there is a great phenotypic diversity among the new strains isolated from the same host. Different groups consisted of the new strains from the same host, some were Rhizobium, some were Bradyrhizobium, such as the new strains isolated from leguminous plants of AMkora Prain, Trifolium repens Lam, Aeachynomene Mica L, Indigofera bungeana Steud.

同时，攀西地区豆科植物根瘤菌的多样性还表现在某些来自同一种寄主植物根瘤菌的多样性方面，如分离自山槐、白车轴草、合萌、铁扫帚上的同一种寄主植物内的根瘤菌分别聚在不同的表观群；且来自山槐、合萌、铁扫帚上的根瘤菌既有快生型，又有慢生型。

Genetic diversity of Juglans are summarized from the level of DNA molecular, the somatic embryogenesis, the establishment of genetic transformation and transgenic research in Juglans. Major

从DNA分子水平系统综述了核桃属植物遗传多样性的研究概况，总结了核桃属植物体细胞胚发生、遗传转化体系的建立及转基因研究进展，分析了核桃属植物分子水平遗传多样性与转基因研究过程中存在的主要问题，并对其应用和发展前景进行了展望。

In this paper , the species resources and genetic diversity of lac insects were briefly introduced , and

本文将在紫胶虫物种、遗传多样性和生态环境的基础上讨论紫胶虫生物多样性

On longitude gradient, from east to west, there is a slight trend of diversity of Lauraceae plants, and no obvious trend was observed on specification strength. In general, the distribution center of Lauraceae plants is in the southern part of the study area with low latitude and altitude(elevation 1500-2000 m or so).

区系分化强度与纬度呈负相关关系，区系分化中心可能在低纬度地区；在经度梯度上，从东到西，樟科植物的多样性呈轻微递减趋势，但区系分化强度无显著变化；总体上，研究区域内樟科植物的多样性分布中心集中在低纬度、中低海拔（海拔1500-2000m左右）的南部地区。

The authors investigate and study the species diversity of Leucaena leucocephala plantation. discuss its function of ecology and the relation between species diversity and the function of ecosystem.

通过对金沙江干热河谷新银合欢人工林物种多样性方面的研究，讨论了种在退化生态系统功能恢复中的作用及物种多样性与生态系统功能的关系。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。