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ecological systems
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  生态系统
     Dissipativity of Lotka-Volterra Ecological Systems
     Lotka-Volterra生态系统的耗散性
短句来源
     The preservation and discharge of soil nitrogen pool and its growth and decline trend in the ecological systems of loess plateau were discussed with the following resulfs:1. The nitrogen preserved in the top soil ( 0-20cm ) was 1.5×108 tons, and 5.0×108 tons in the layer reached by the plant roots ( 0-1m).
     本文以黄土高原生态系统中土壤氮库为中心,研究了土壤氮库的能量、流量以及消长趋势。 研究结果表明,黄土高原表层(0—20cm)土壤氮库储氮量为1.5×10~8t,主要吸肥层(0—1m)为5.0×10~8t。
短句来源
     A Study of a Class of Almost Periodic Ecological Systems
     一类概周期生态系统的研究
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     Landscape Structure and Heterogeneity of Ecological Systems for Urban Vegetation in Xiamen City
     厦门城市绿地生态系统景观结构与异质性分析
短句来源
     Stability of n species cooperative Lotka-Volterra ecological systems
     n种群Lotka-Volterra合作生态系统的稳定性
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  生态学系统
     The Kernel of Landscape Ecology: Spatial and Temporal Heterogeneity in Ecological Systems.
     景观生态学的核心:生态学系统的时空异质性
短句来源
     Spatial heterogeneity in ecological systems
     生态学系统的空间异质性
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  “ecological systems”译为未确定词的双语例句
     Measurements and estimates are made of the potentiality of the agricultural resources, and a detailed quantitative analysis is attempted of the efficiency and structure of the economic sectors that make use of the resources, the economic systems, the geographical distriburion and the ecological systems.
     事实和数据证明,国营农垦系统的橡胶业对海南岛农业生产能以较快的速度发展起了重要作用。 本文还对该岛的农业资源潜力作了计量和估计,对农业资源利用的经济部门结构、经济成分结构、区域结构和生态结构及其效率作了颇为详细的分析。
短句来源
     Hanzhong is located in the main water conservation district of South-to-North Water Transfer Project, and its state-owned farm is the essence of forest resources in the region, so as the framework of ecological systems and the water security barrier, the ecological location of Hanzhong is very important.
     汉中市是南水北调中线工程的主要水源涵养区,国有林场又是这一区域森林资源的精华所在,生态区位很重要,是生态体系的骨架,生态及水资源安全的屏障。
短句来源
     Through the explicit consideration of space and spatial pattern it has been showed that spatial heterogeneity may act either to stabilize or destabilize ecological systems and processes.
     随着认识的转变 ,对生态过程中的“空间”和空间异质性的理解也发生了变化 ,传统生态学总是试图回避空间动态和空间异质性问题 ,而着重强调时间格局的重要性。
短句来源
     2. Through the analysis of the natural ecological systems and social conditions, the soil salinity, water shortage, and organic fertility scarcity are the main limitations for the reconstruction.
     2.全面分析了研究区自然生态与社会经济条件,结果表明土壤盐渍化、水资源匮乏、有机肥源不足等是制约该地区生态重建的主要因素。
短句来源
     The food web,trophic levels,ecological pyramid and ecological efficiencies are similar in the two ecological systems.
     结果表明:(1)两类棉田系统的食物网结构、营养层、生态锥体、生态效率等基本特征相似,在能量分配方面有量的差异;
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  ecological systems
First, ecological water requirements in a basin scale indicate not only the coupling of hydrological and ecological systems, but also the exchange of matter and energy between each ecological type through all kinds of physical geography processes.
      
On the Possibility of Physical Self-Organization of Biological and Ecological Systems
      
The divisions of modern human ecology that deal with different organizational levels of ecological systems have been developed to different degrees.
      
Spatial heterogeneity is a very important issue in studying functions and processes of ecological systems at various scales.
      
Ecological systems in the headwaters of the Yellow River, characterized by hash natural environmental conditions, are very vulnerable to climatic change.
      
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The two superpowers,the Soviet Union and the United States,have given much publicity to an“ecological crisis”.They claimed that environmental pollution has upset the“inherent balance”in the ecological system on which mankind relies for the existence,that it will inevitably lead to“catastrophe and death”. Such fallacies are mainly reflected in their basic views on“ecological balance” and their attitude toward it as well as the root cause of its destruction etc. It is metaphysical to regard“ecological...

The two superpowers,the Soviet Union and the United States,have given much publicity to an“ecological crisis”.They claimed that environmental pollution has upset the“inherent balance”in the ecological system on which mankind relies for the existence,that it will inevitably lead to“catastrophe and death”. Such fallacies are mainly reflected in their basic views on“ecological balance” and their attitude toward it as well as the root cause of its destruction etc. It is metaphysical to regard“ecological balance”as something absolute.With this erroneous standpoint,one will certainly fail to recognize the decisive role played by man in the relations between man and nature.This is decided by bourgeois world outlook and class nature.It is absolutely not the“erroneous actions of man- kind”that constitutes the root cause to upset“ecological balance”but the system of capitalist expolitation.Only when socialism replaces capitalism,people will be able to constantly know nature in depth and transform it,upset old equilibrium in a planned way and set up a new one and push forward the cause of socialism sys- tematically and step by step.

苏美两个超级大国大肆宣传“生态危机”,声称环境污染破坏了“人类赖以生存的生态系统的固有平衡”,必然引起“毁灭和死亡”。这种错误观点,主要反映在对生态平衡的基本看法,如何对待生态平衡以及破坏生态平衡的根源等问题上。把生态平衡绝对化是形而上学的观点。这种错误观点在对待人和自然界的关系中,必然看不到人的决定作用。这是由资产阶级世界观以及资产阶级的阶级本性所决定。破坏生态平衡的根源绝不是“人类的错误行动”,而是资本主义的剥削制度。只有社会主义代替了资本主义,才能不断深刻地认识自然、改造自然,有计划的打破旧平衡,建立新平衡,使社会主义事业有计划、有步骤的向前迈进。

A basic structure of the dental plaque on the occlusal surfaces ofhuman teeth is reported. From this investigation it can be concludedthat dental plaque is a viable ecological system, being mainly composedof bacteria. The dental plaque can be evidently divided into three layers,namely, an inner membranous layer which contains no bacteria; an intermediatelayer which is composed mainly of filaments and a few amount of rodsand cocci; an external layer which consists of enormous amounts of Gram-posi-tive cocci...

A basic structure of the dental plaque on the occlusal surfaces ofhuman teeth is reported. From this investigation it can be concludedthat dental plaque is a viable ecological system, being mainly composedof bacteria. The dental plaque can be evidently divided into three layers,namely, an inner membranous layer which contains no bacteria; an intermediatelayer which is composed mainly of filaments and a few amount of rodsand cocci; an external layer which consists of enormous amounts of Gram-posi-tive cocci and other kinds of microorganisms. By the use of transmission electron microscopy, the mitotic, prolifer-ative and death figures of the bacterial cells have been observed.

作者通过对人牙咬合面菌斑基本结构的研究证明:菌斑可分为三层,内层是一层不含细菌的膜;中间层主要为丝状菌和一些球菌、杆菌;外层系由大量球菌和少量其它成份组成。

This paper gives a preliminary analysis of field ecological system of the lu Jia wan Production Brigade at De Chin County and the Zong An Production Brigade at Tong Xiang County from the point of view of ecological balance on the basis of investigation.These two productive brigades are both located on Hang Jia Hu area at the northern parts of Zhejiang province.Field crop production,animal husbandry,silkworm raising and mulberry production,and fishery practised by the two brigades constitute a complex...

This paper gives a preliminary analysis of field ecological system of the lu Jia wan Production Brigade at De Chin County and the Zong An Production Brigade at Tong Xiang County from the point of view of ecological balance on the basis of investigation.These two productive brigades are both located on Hang Jia Hu area at the northern parts of Zhejiang province.Field crop production,animal husbandry,silkworm raising and mulberry production,and fishery practised by the two brigades constitute a complex system of energy transformation and material circulation,and form a comparably rational ecological balance.This balance guarantees the increase of agricultural productivity and the realization of an yearly average production of over 1,000 kg per mu,with 7-8 years of stable and high yield in succession.This system of agricultural production substantially carries out the good practice reasonably utilying the soil fertility and simultaneously maintaining and even enriching it.This could be confirmed by the organic matter and nitrogen circulation and the improvement of soil fertility.The agricultural system practised at both these two brigades is one of the models of the field ecological system in the canal networks of the plain region to arrive at an ecological balance.Although there are inperfective and inadequate,it surely has many good points,and undoubtedly it provide instructive experiences,that will be helpful in the planning of the cropping systems on the farms.Thus it is worthy of consideration.

本文在调查研究的基础上,以生态平衡的观点,对浙江北部杭嘉湖地区的德清县陆家湾大队与桐乡县众安大驮的农田生态系统作了初步分析。 这两个大队的大田作物生产、畜牧业、蚕桑业、渔业构成了一个复杂的能量转化和物质循环系统,形成了较为合理的生态平衡,从而保证了提高农业生产力,实现连续七、八年每年粮食平均亩产超过2000斤的持续稳产高产,并做到了用地与养地相结合。这可以从有机物质、氮素的循环和土壤肥力因素的改善得到证明。 这两个大队是平原水网地区农田生态系统生态平衡的一种模式,虽然它们还有不足之处,但确有很多优点和经验,能给我们启发,值得学习与提倡。

 
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