生态群落

In mechanical communities, or ecosystems, some machines are more likely to associate with certain other machines, just as red-winged blackbirds favor nesting in cattail swamps. Pumps go with pipes, furnaces go with air conditioners, switches go with wires.

在机械群落里，或者说机械生态系统里，某些机器好像更愿意和另一些机器在一起，就像红翅膀的黑鸟喜欢在有香蒲的湿地筑巢，泵与管相配，暖炉与空调相配，开关和导线相配。

It therefore implies that white clover intercropping and straw mulching are effective ecological weed control measures.

结果表明两种生态控草处理措施能改变茶园杂草群落结构，有效控制杂草的生长。

Pyramid of biomass A type of ecological pyramid based on the total amount of living material at each trophic level in the community, which is normally measured by total dry weight or calorific value per unit area or volume, and shown diagrammatically.

生物量金字塔：指基于群落每个营养水平上有生命的物质总量的一种生态金字塔类型，通常通过总干重或者每单位面积或体积的生热量值来衡量，并用图表表示出来。

The major factors which hinder the sustainable management of Chinese fir plantation include not only the vulnerable subtropical red soil ecosystem which Chinese fir grow in, but also the unitary community structure and the biological characteristic of this artificial forest community. Additionally, the traditional culture system of Chinese fir including controlled burning lead to the degradation of soil ferti-lity.

影响杉木人工林可持续经营的因素是多方面的，主要和杉木人工林所处亚热带红壤区生态系统的脆弱性和杉木人工林群落的单一性及杉木生物学特性等有关，而传统杉木林培育过程中采取一系列传统的营林措施则加剧了林地地力衰退。

In the raft mari-culture waters of the Jiaozhou Bay, China, a benthic chamber system for production measurement in situ was established. The O 2-flux was calculated based on the benthic closed-circuit chamber incubations of undisturbed sediment under light and dark conditions for estimating the benthic primary production and respiration.

为对生态系统的健康评估及底栖生物资源的开发利用提供技术支撑，在胶州湾筏式养殖水域，建立了底栖生物生产力现场测试系统，并在光照和黑暗条件下测定了沉积物海水界面溶解氧随时间的变化、计算了氧通量、估算了底栖总初级生产力和群落呼吸。

To increase and keep the variety of community of greenbelt is a most important problem in a modern city. It is also a foundation to keep the balance of ecosystem and increase the species diversity.

中文摘要增加和保持城市绿地群落的多样性是现代城市绿化的重要问题之一，是保持生态平衡和保持物种多样性的根本保证。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。