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   栖息地多样性 的翻译结果: 查询用时:0.485秒
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栖息地多样性
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  “栖息地多样性”译为未确定词的双语例句
     The authors have studied amphibians and reptiles in Henan Province for many years. On this basis, brief notes of the diversity of habitats, species and faunal elements of amphibians and reptiles are discussed;
     本文作者在对河南省两栖爬行动物多年研究工作的基础上,概述了河南省两栖爬行动物栖息地多样性、物种多样性及区系成分多样性;
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     The project mainly solved the problems from the flood control,the morphological diversity of river profile and cross section,and the diversity of habitats in the river through the layout of shoreline and structures,the design of river profile and cross section,the design of riverbank protection,which is one effective engineering practice of Eco-Hydraulic Engineering.
     治理工程在岸线布置、沿河建(构)筑物布置、河流纵横断面设计、岸坡防护设计等方面解决了防洪安全、河流纵向形态多样性、断面形态多样性以及河流内栖息地多样性等问题,是生态水工学理念的一次有效工程实践。
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  相似匹配句对
     Vegetation diversity of wild Chinese alligator(Alligator sinensis) habitats
     野生扬子鳄栖息地植被多样性
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     Research on Plant Biodiversity at habitat of Rhinopithecus bieti
     滇金丝猴栖息地植物多样性研究
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     Genetic Diversity
     基因多样性
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     The Diversity of Children's Literature
     儿童文学的多样性
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     A Research on Gazelle Habitat
     黄羊栖息地的研究
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  habitat diversity
We report here an unexpected expansion of the habitat diversity of the Archaea in the Cariaco Basin we found using a primer set designed for 18S eukaryotic rDNA sequence analysis.
      
Isolates from three aquatic environments exhibited within -and among - habitat diversity by RFLP.
      
The between-site differences are related to tidal level, to habitat diversity and to habitat patch-size.
      
Within aggregations, the plants host relatively few epiphytes and thus lack habitat diversity, and the net emigration rates of many animals including epiphyte-dwellers are relatively high.
      
A strict comparison of the structure of the first two of these communities with their counterparts in England shows that within-habitat diversity is similar in both regions.
      
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The authors have studied amphibians and reptiles in Henan Province for many years. On this basis, brief notes of the diversity of habitats, species and faunal elements of amphibians and reptiles are discussed; their distribution and density are roughly estimated; endangered status, categories and causes of some species are preliminarily analyzed; and conservation strategies of herpetodiversity in Henan Province are suggested.

本文作者在对河南省两栖爬行动物多年研究工作的基础上,概述了河南省两栖爬行动物栖息地多样性、物种多样性及区系成分多样性;对其分布数量作了简要估计;对一些种类的受胁濒危状况、程度及原因进行了初步分析;就河南省两栖爬行动物多样性的保护提出了相应的对策。

The species-area relationship of insular faunas has been described and interpreted for over 70 years, but there is little agreement on its cause. Four processes have been proposed to explain this pattern: the equilibrium hypothesis, the passive sampling hypothesis, the habitat diversity hypothesis and the disturbance hypothesis. In this paper, we assessed the four hypotheses and analyzed the richness of island habitat avian communities and their influencing factors. Studies were conducted at 20 urban woodlots...

The species-area relationship of insular faunas has been described and interpreted for over 70 years, but there is little agreement on its cause. Four processes have been proposed to explain this pattern: the equilibrium hypothesis, the passive sampling hypothesis, the habitat diversity hypothesis and the disturbance hypothesis. In this paper, we assessed the four hypotheses and analyzed the richness of island habitat avian communities and their influencing factors. Studies were conducted at 20 urban woodlots in Hangzhou, China during January to December in 1997. These urban woodlots are well separated from one another, forming isolated patches in urban matrix. Each woodlot was visited twice per month during bird migrant seasons in April, May, October and November, once in the other months. So each woodlot was visited 16 times all year. Twenty habitat variables, including woodlot area, shape, the degree of canopy, leave height diversity, horizontal heterogeneity, connectivity, disturbance level, surrounding, etc., were selected to enter multiple stepwise regression to test their influences on the richness of island habitat avian communities. 82 bird species were recorded at 20 urban woodlots all year. The fit equations of species number of one woodlot in one census (S) and species number of one woodlot all year (S y) with woodlot area were: S = 2.7432A 0.3846 and S y = 10.6574A 0.3669. At the basis of species-area relationship above, we discussed the value of z in the equation of S=CA z and its significance, which has drawn much attention and remains questionable. z was traditionally thought to reflect the degree of isolation of an archipelago. We thought that z in the equation was just a constant and had no biological implication. It was affected by many factors besides isolation. To test the effect of sample size, species-area relationship and species density-area relationship of woodlot avian communities were compared. The results showed that species number increased with woodlot area increasing, while species density decreased with woodlot area increasing, which reveals that under the same sample size small woodlots have more species than large one. The best multiple regression models showed that species number of one woodlot in one census (S) was significantly affected by woodlot shape, tree species diversity, number of street tree strips connected to woodlot, leave height diversity, distance to the nearest woodland larger than 2 hm 2 and density of canopy layer. They explained 68.4% the variation in species number, among which tree species diversity was the most important factor influencing species number (58.3%). Species number of one woodlot all year (S y) was significantly affected by woodlot shape and tree species diversity. The results of multiple regression indicate that besides the effect of sample size there are other factors more important influencing species richness. The avian community richness of Hangzhou urban woodlots were the results of synthesized action of multi-factors, including the effects of different sample size, the habitat diversity, disturbance factors, species factors and the effect of different research scales etc. Some of them significantly correlated with woodlot area. This is one of the causes that species number significantly correlate with woodlot area. Though the results of our studies partly supported the habitat diversity hypothesis and the passive sampling hypothesis, no of the four hypotheses alone could explain the species-area relationship of urban woodlot avian communities in Hangzhou. Natural communities are usually complicated. These hypotheses were raised on special communities and focused on some special habitat factors, so they couldn't explain all communities. Most communities are affected by the synthesized actions of multi-factors. If the conclusion is considered as the synthesis hypothesis, the four hypotheses are the special case of the synthesis hypothesis. Models are the simplification of nature, but ecologists should be cautious to simplification. W

1 997年 1月至 1 997年 1 2月间 ,以杭州市的园林鸟类群落为研究对象 ,对岛屿栖息地鸟类群落的丰富度与面积、人为干扰、内部结构和周围景观结构等多种因素的关系进行了系统的分析和检验。在杭州市各园林中共观察到 82种鸟类。园林单次调查的鸟类物种数 ( S)与园林全年总物种数 ( Sy)与园林面积 ( A)的最佳回归拟合方程分别为 :S =2 .74 32 A0 .3 84 6,Sy=1 0 .6 5 74 A0 .3 669。杭州市园林鸟类群落物种 -面积关系的成因不支持平衡假说、随机取样假说、栖息地多样性假说和干扰假说 ,岛屿栖息地鸟类群落的丰富度是多因素综合作用的结果 ,包括取样面积效应 (排除了取样面积效应之后 ,小园林具有更高的物种密度 )、栖息地结构的多样性 (其中树种多样性是最主要的影响因子 )、干扰因素、物种因素和研究尺度等几个方面。

The development of step-pool system plays an important role in stream ecology.Step-pool system maximizes the flow resistance and protects the bed sediment from erosion.Thus the riverbed and bank slope are stabilized.Boulders,cobbles and gravel tightly interlock and form the steps having an inherent stability which only extreme floods are likely to disturb.Silt and clay deposit in the pools behind the steps.These steps and pools provide high diversity of habitats for stream bio-community.Field investigations...

The development of step-pool system plays an important role in stream ecology.Step-pool system maximizes the flow resistance and protects the bed sediment from erosion.Thus the riverbed and bank slope are stabilized.Boulders,cobbles and gravel tightly interlock and form the steps having an inherent stability which only extreme floods are likely to disturb.Silt and clay deposit in the pools behind the steps.These steps and pools provide high diversity of habitats for stream bio-community.Field investigations are performed to the Xiaojiang River,Jinsha River and Jiuzhai Creek.Step-pool systems develop well in the Jiuzhai Creek and Shengou Ravine,which is a tributary of the Xiaojiang River.The density of benthic macro-invertebrate is 552/m~(2) in the Jiuzhai Creek and 398/m~(2) in the Shengou Ravine and the density of bio-mass of benthic macro-invertebrate is 4.75g/m~(2)in the Jiuzhai Creek and 5.96 g/m~(2)in the Shengou Ravine.As a comparison,the density of benthic macro-invertebrate is only(0.75)/m~(2) in the Jiangjia Ravine and 0 in the Xiaobaini Ravine,which are also the tributary of the Xiaojiang River,but no step-pool develops in the ravines.The density of bio-mass of benthic macro-invertebrate is only 0.006 g/m~2 in the Jiangjia Ravine and 0 g/m~2 in the Xiaobaini Ravine.This paper proposes the concept of habitat diversity and a calculation formula considering the spacious distribution of various substrates,velocity and water depth.The study reveals that the biodiversity of benthic macro-invertebrates increases with the habitat diversity in a logarithmic law.Artificial step-pool system can be used for training of mountain streams,which may stabilize the streambed and bank slope,restore healthy river ecology and high biodiversity,and better aesthetic landscape as well.

山区河流发育的阶梯—深潭系统具有显著的生态学作用。阶梯—深潭系统增大水流阻力和河床抗冲刷力,稳定了河床和岸坡。大卵石堆积成阶梯,细颗粒泥沙在深潭河段的缓流滞流区沉积下来形成淤泥层,形成适宜多种生物的栖息地。选择小江支流———深沟、蒋家沟和小白泥沟,以及四川九寨沟和金沙江进行野外实验、取样分析。结果发现阶梯—深潭系统较发育的深沟和九寨沟底栖动物密度高达552个/m2,生物量高达5.96 g/m2。而邻近的小白泥沟和蒋家沟底栖动物密度仅0.75个/m2,生物量不到0.006 g/m2。考虑河流不同部位底质、水深、流速等特性,提出了生物栖息地多样性及其计算方法,研究发现大型无脊椎动物的生物多样性随栖息地多样性增加而增加。利用阶梯—深潭系统治理山区河流,既能保持河道稳定,又能维持较高的生物多样性,保持健康的河流生态系统。

 
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