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淡水生态系统     
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  freshwater ecosystem
     The top down effect and biodiversity conservation in freshwater ecosystem/
     淡水生态系统中的TOP-DOWN效应与生物多样性保护
短句来源
     Discussion on freshwater ecosystem service and its evaluation index system.
     淡水生态系统服务及其评价指标体系的探讨
短句来源
     Unicellular green algae plays a key role in freshwater ecosystem, which possesses a CO 2 concentrating mechanism that can increase the level of CO 2 at the active site of ribulose bisphosphate carboxylase oxygenase (Rubisco) by actively transporting inorganic carbon when adapted to low CO 2 concentration.
     单细胞绿藻是淡水水体中浮游植物的重要组成部分 ,也是淡水生态系统中主要的初级生产者 ,其在适应外界环境CO2 浓度变化的过程中 ,细胞内形成了一种主动转移无机碳的机制———CO2 浓缩机制(CO2 concentratingmechanism ,CCM ) .
短句来源
     Impacts of Greenhouse Effect on freshwater ecosystem
     温室效应对淡水生态系统的影响
短句来源
     Retrospect on the History of Scientific Review in Antarctica, with Emphasis on Its Freshwater Ecosystem Research
     南极科学考察概况及淡水生态系统研究
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  fresh water ecosystem
     The top down effect and biodiversity conservation in freshwater ecosystem/
     淡水生态系统中的TOP-DOWN效应与生物多样性保护
短句来源
     Discussion on freshwater ecosystem service and its evaluation index system.
     淡水生态系统服务及其评价指标体系的探讨
短句来源
     Unicellular green algae plays a key role in freshwater ecosystem, which possesses a CO 2 concentrating mechanism that can increase the level of CO 2 at the active site of ribulose bisphosphate carboxylase oxygenase (Rubisco) by actively transporting inorganic carbon when adapted to low CO 2 concentration.
     单细胞绿藻是淡水水体中浮游植物的重要组成部分 ,也是淡水生态系统中主要的初级生产者 ,其在适应外界环境CO2 浓度变化的过程中 ,细胞内形成了一种主动转移无机碳的机制———CO2 浓缩机制(CO2 concentratingmechanism ,CCM ) .
短句来源
     Impacts of Greenhouse Effect on freshwater ecosystem
     温室效应对淡水生态系统的影响
短句来源
     Retrospect on the History of Scientific Review in Antarctica, with Emphasis on Its Freshwater Ecosystem Research
     南极科学考察概况及淡水生态系统研究
短句来源
更多       
  freshwater ecosystems
     Complexity in Freshwater Ecosystems
     淡水生态系统中的复杂性问题
短句来源
     In freshwater ecosystems,higher trophic level group may influence lower trophic levels strongly,leading to a change of the whole enviroment,which is called top down effect.
     淡水生态系统中高营养级类群可以对低营养级类群产生强烈的影响,最终导致整个生态环境的改变,这一现象被称作下行(topdown)效应。
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  “淡水生态系统”译为未确定词的双语例句
     then, the adjustment action of aquatic ecosystem for global change is discussed, mostly included the adjustments of freshwater and ocean ecosystem for global change;
     其次,论述水生生态系统对全球变化的调节作用,主要包括淡水生态系统对全球变化的调节作用以及海洋生态系统对全球变化的调节作用;
短句来源
     forest ecosystem was US$ 1.00 billion, accounted for 5.4%, cropland ecosystem was US$ 0.114billion, about 0.62%, water ecosystem was US$ 4.58 billion and 24.8%;
     农田生态系统每年提供1.14亿美元,占0.62%; 淡水生态系统每年提供45.8亿美元,占24.8%。
     On complexity of freshwater ecology, much progress may be made in the following: RCC (River continuum concept) theory, study on ecology health by way of IBI (Index for Biotic Integrity) and IWI (Index of Watershed Indicators), scaling and fractal, ecosystem management and information system, spatial data analysis and heterogeneity, mathematical model and chaos etc.
     淡水生态系统复杂性研究可能取得的进展有如下几个方面 :RCC (rivercontinuumconcept河流连续统 )理论 ,以IBI (indexforbi oticintegrity生物完整性指数 )和IWI (indexofwatershedindicators)等为代表的生态系统健康研究 ,scaling(尺度推绎 )与fractal(分形 ) ,生态系统管理与信息系统 ,空间数据分析与异质性 ,数学模型与混沌等
短句来源
     Algae photosynthesis showed a strong buffer capacity to acidity at pH 5.5 and above,which was weakened remarkably when pH value dropped below 5.0. The threshold value of low pH for aquatic system ranged from 5.0 to 5.5. The algae species composition and community character in two small acidified waters (pH4.7) were investigated as well.
     低pH对淡水生态系统的阈值处在5.0—5.5间,pH5.5可推荐为水体酸化标准。 研究了两个小型酸化水体(pH4.7)中的藻类群落特征。
短句来源
     Quantitative risk analyse and simulate were used to researching main policy change and development.
     总之,以上所述,本研究首次进行了我国淡水生态系统与渔业发展的定量风险分析,并运用Ec叩ath with Ecosim等软件和新的方法对渔业政策,渔业小型化发展与对策,渔业资源与环境的可持续发展进综合评估。
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  freshwater ecosystem
Mechanisms of dominance: coexistence of picocyanobacterial genotypes in a freshwater ecosystem
      
A quantitative immunological method was developed for measuring serum vitellogenin levels of Reeves' pond turtles (Chinemys reevesii) to investigate the effects of endocrine disruptors on the freshwater ecosystem.
      
The possible ecological consequences of removing either predator or prey from a freshwater ecosystem as a result of a pollution incident are also considered.
      
On the basis of these data, we discuss possible mechanisms whereby Rickettsia infection is maintained in natural populations of these leeches in the freshwater ecosystem.
      
To facilitate decision support in freshwater ecosystem protection and restoration management, habitat suitability models can be very valuable.
      
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  fresh water ecosystem
Pentachlorophenol distribution in a fresh water ecosystem
      
  freshwater ecosystems
Ecologically tolerable levels (ETL) of environmental factors have been determined for freshwater ecosystems in Asiatic part of Russia and neighboring countries (basins of Ob, Yenisei, Lena, Amur, and Syr-Darya rivers).
      
Quantitative Relationships between Predatory and Nonpredatory Animals in Freshwater Ecosystems
      
International conference "Bioindication in the Monitoring of Freshwater Ecosystems"
      
The increase in the penetration of ultraviolet radiation that has been reported lately for freshwater ecosystems in southern South America would allegedly generate alterations in ecological processes.
      
Many owners, ignoring the potential consequences of their act, have released their grown up turtle in natural freshwater ecosystems.
      
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Ecological effects of water acidification on algae were investigated in microcosm(250ml) with fresh-water organisms of various trophic levels and using algal bioassay with Scenedesmus obliquus. The significant inhibitory influences of acidification on algae were observed, and the 48h-EC50 and 96h-EC 50 for Scenedesmus obliquus were 4.45 and 4. 65,respectively. Algae photosynthesis showed a strong buffer capacity to acidity at pH 5.5 and above,which was weakened remarkably when pH value dropped below 5.0. The...

Ecological effects of water acidification on algae were investigated in microcosm(250ml) with fresh-water organisms of various trophic levels and using algal bioassay with Scenedesmus obliquus. The significant inhibitory influences of acidification on algae were observed, and the 48h-EC50 and 96h-EC 50 for Scenedesmus obliquus were 4.45 and 4. 65,respectively. Algae photosynthesis showed a strong buffer capacity to acidity at pH 5.5 and above,which was weakened remarkably when pH value dropped below 5.0. The threshold value of low pH for aquatic system ranged from 5.0 to 5.5. The algae species composition and community character in two small acidified waters (pH4.7) were investigated as well.

通过综合生态模拟(微宇宙)试验和藻类生物测试,研究了水体酸化对藻类的影响,结果表明,水体酸化对藻类有明显的抑制作用。48h-EC50和96h-EC50(对斜生栅藻)分别为pH4.45和4.65,当pH≥5.5时,藻类的光合作用对酸度具有很强的缓冲能力。当pH<5.0时,缓冲能力较弱。低pH对淡水生态系统的阈值处在5.0—5.5间,pH5.5可推荐为水体酸化标准。研究了两个小型酸化水体(pH4.7)中的藻类群落特征。

An aquatic microcosm was synthesized in the laboratory by using pure cul- tured organisms,artificial medium and standard sediment.The artificial biotic assembly in- cluded eighr species of algae,two species of protozoa and one species of crustacean as well as the natural microbial community existing in the laboratory.The test duration lasted 28-31 days,during which the growth-decline relationship between algal community and Daphnia population,and the variations of gross primary productivity(P),total respiration...

An aquatic microcosm was synthesized in the laboratory by using pure cul- tured organisms,artificial medium and standard sediment.The artificial biotic assembly in- cluded eighr species of algae,two species of protozoa and one species of crustacean as well as the natural microbial community existing in the laboratory.The test duration lasted 28-31 days,during which the growth-decline relationship between algal community and Daphnia population,and the variations of gross primary productivity(P),total respiration (R)and P/R ratio were investigated.The results showed that the synthesized aquatic microcosm displayed the fundamental function and ecological process occurring in natural aquatic ecosystems.The biotic components and metabolism tended to be stable through the succession of microcosm,and the results were repeatable.The microcosm technique prom- ised to be a multispecies testing system in the risk assessment of chemicals on levels of popu- lation,community and ecosystem.

在实验室内以贮备的纯培养生物、培养液和沉积物组建了水生微宇宙。生物群落包括我国淡水生态系统常见的8种藻、2种原生动物和1种甲壳动物,以及存在于实验室内的天然微生物群落.微宇宙运行28—31天,研究了藻类群落和大型溞种群的消长关系,以及毛初级生产力 P、总呼吸 R 和 P/R 比值的变动规律。试验结果表明,这种人工组合的水生微宇宙具有天然水生态系统的基本功能和生态学过程,经演替后,其生物组成和代谢可趋于稳定,并具有可重复性,可望作为在种群、群落和生态系统水平上评价化学品风险的多物种试验系统.

An aquatic microcosm was synthesized in the laboratory by using pure cul- tured organisms,artificial medium and standard sediment.The artificial biotic assembly in- cluded eighr species of algae,two species of protozoa and one species of crustacean as well as the natural microbial community existing in the laboratory.The test duration lasted 28-31 days,during which the growth-decline relationship between algal community and Daphnia population,and the variations of gross primary productivity(P),total respiration...

An aquatic microcosm was synthesized in the laboratory by using pure cul- tured organisms,artificial medium and standard sediment.The artificial biotic assembly in- cluded eighr species of algae,two species of protozoa and one species of crustacean as well as the natural microbial community existing in the laboratory.The test duration lasted 28-31 days,during which the growth-decline relationship between algal community and Daphnia population,and the variations of gross primary productivity(P),total respiration (R)and P/R ratio were investigated.The results showed that the synthesized aquatic microcosm displayed the fundamental function and ecological process occurring in natural aquatic ecosystems.The biotic components and metabolism tended to be stable through the succession of microcosm,and the results were repeatable.The microcosm technique prom- ised to be a multispecies testing system in the risk assessment of chemicals on levels of popu- lation,community and ecosystem.

在实验室内以贮备的纯培养生物、培养液和沉积物组建了水生微宇宙。生物群落包括我国淡水生态系统常见的8种藻、2种原生动物和1种甲壳动物,以及存在于实验室内的天然微生物群落.微宇宙运行28—31天,研究了藻类群落和大型溞种群的消长关系,以及毛初级生产力 P、总呼吸 R和 P/R 比值的变动规律.试验结果表明,这种人工组合的水生微宇宙具有天然水生态系统的基本功能和生态学过程,经演替后,其生物组成和代谢可趋于稳定,并具有可重复性,可望作为在种群、群落和生态系统水平上评价化学品风险的多物种试验系统.

 
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