多样性

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。

In silvicultural regeneration treatment,the diversity of shrubs and herbages increases gradually in stage A1～A3,and the variation will continue after stage A3,further work is needed to examine the dynamic.

群落多样性是指生物群落在组成、结构、功能和动态等方面的多样化，是生物多样性各个层次中研究得最早的一个层次，其研究内容主要侧重于群落的物种组成和结构的多样性[1]。

On the ecosystem health, definitions from utilization and ecosystem views are introduced, the contents and difficulties in assessing it are discussed. On the biodiversity enhancement, the relationship between forest structural complexity and forest biodiversity are discussed, the significance of old growth structure are highlighted, and measures of changing forest structure to promote forest biodiversity are put forward. On the landscape planning in forest management, some patterns, theoretical foundations and models are introduced, especially three conceptual models, i.e., key habitat\|corridors model, nature landscape model, and supportive features model. On the alternative silvicultural systems, reasons for developing alternative silvicultural system by mimic of nature disturbance are discussed, and some advanced techniques and their ecological basis are noted. Finally, on the ecosystem service, its contents and importance of assessment are illustrated.

关于森林生态系统健康，讨论了不同角度对生态系统健康的定义和不同层次上的生态系统健康的内容及评价生态系统健康的困难所在；②关于森林生物多样性，探讨了森林结构复杂性与生物多样性的关系，老龄林结构对森林生态系统的意义和作用，以及如何通过经营调整结构促进生物多样性；③关于森林经营的景观规划，描述了进行景观规划的途径、理论和模型，并对三种概念模型进行了介绍；④关于森林经营的替代技术体系，介绍了模拟自然干扰设计替代技术体系的原理，分析了替代经营技术体系产生的原因和有关最新技术研究进展；⑤关于森林生态系统服务，讨论了生态系统服务的基本内容和评价在森林生态系统管理中的重要意义。

According to species richness, Shnnon-Weiner indexand sterve of diversity-area, we study on the dynamics of species diversity of the secondary succesional communities of evergreen broaded-leaved forests on Jinyun mountain about ten years.

采用物种丰富度S和物种多样性香农指数H、物种均匀度指数J以及多样性-面积曲线研究缙云山常绿阔叶林次生演替序列物种多样性近十年的变化。

The diversity of LH08 station was the lowest, and the diversity difference of every station was significant. The analysis on species diversity index and advantage curve showed that community structure of zoobenthos on every station was less effected, indicating that the sea area was on mild artificial disturbance status.

位于港池的LH08站多样性最低，各站位的多样性差异显著；物种多样性指数和K-优势曲线的分析显示，各站位的底栖动物群落结构没有受到较大影响，表明该海域处于轻度人为扰动的状态。

Shannon-Wiener diversity index, Simpson diversity index and evenness index all show similar trend of change. The diversity indexes and evenness index of zoobenthos in rice-duck farming ecosystems are higher than those in normal paddy during the early stage of rice growth, but are in the reverse trend during the later stage.

水稻各生育时期常规稻田和稻鸭共作稻田底栖动物的Shannon-Wiener多样性指数、Simpson多样性指数和Pielou均匀度指数变化趋势相似，均为水稻生育前期稻鸭共作稻田的生物多样性指数和均匀度指数高于常规稻田，而后期低于常规稻田。

Furthermore, the zoogeographical analysis shows that the fauna in the areas, of 300~600 m is greatly related to that of 600~900 m. So, the areas of 600~900 m are most important to conserve amphibians and reptiles.

因此，保护好海拔600~900 m区段的物种多样性成为保护该地物种多样性的关键，并可以有效地降低电站的建设对物种多样性的影响。

3The study on the diversity of soil microbial community of Pinus bunging Zucc.et Endl 20 diferent microbial community in the soil were analyzed and compared by species richness index,diversity index and evenness index.The result showed that Species Composition,Quantity Variation and Bio-diversities ect.of soil microbial community differed.

3白皮松土壤微生物群落多样性研究运用丰富度指数、均匀度指数和多样性指数对不同生境的土壤微生物进行分析比较，结果表明，分布在20个样地的微生物各自组成了相应的群落，群落内属的种类、数量组成、多样性、均匀性等都是不同的。

The influencing effects of grain production systems on the population of second generation of cotton bollworm in cotton were studied. The multi-harvest system provided cotton a good protection against cotton bollworm due to the corn plants in this system strongly attracted cotton bollworm adults when they were ovipositing, therefore reduced the density of cotton bollworm in cotton, compared with ton-grain system..

转Bt基因抗虫棉对棉田节肢动物多样性的影响用吸虫器取样和捕虫网取样两种方法，研究了转基因抗虫棉和化学防治对棉田节肢动物多样性的影响，发现转Bt基因棉棉田与非转基因常规棉棉田棉花害虫、自然天敌和中性节肢动物亚群落没有显著差异，而化学防治可以使各亚群落的个体数量、物种数量、多样性指数发生剧烈变化。

Diversity between two quadrates within a community decreased with increasing elevation. The peak values of dissimilarity index and Cody index along elevation gradient just matched the ecotones between different vegetation types.

群落内的β多样性随海拔的升高而下降，而群落间的β多样性可以很好地反映群落间的相似性关系，β多样性较大的几个峰值恰好是不同植被类型间的分界。

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。