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- biogeochemical nitrogen cycle 生物地球化氮循环
- Nitrogen cycle is an important biogeochemical process in the environment.Measurement of total nitrogen (TN) is a routine experiment in researches in agriculture, biology and environmental sciences. 摘要氮循环是生物地球化学研究领域中最重要的课题之一，全氮含量的测定是农业、生物和环境等多领域研究中的常规测试项目。
- Nitrogen cycle: fix N2 into compounds useful as nutrients for plants and animals. （氮循环：固定的N2化合物作为植物和动物的营养素。
- Nitrogen turnover from grazing livestock excreta is the key process in the nitrogen cycle of pasture ecosystems. 放牧家畜排泄物氮转化是草原生态系统氮循环的关键。
- Any of various soil bacteria that take part in the nitrogen cycle, oxidizing ammonium compounds into nitrites or nitrites into nitrates. 硝化细菌一种参与氮环核，将氨的化合物氧化成亚硝酸盐或将亚硝酸盐氧化成硝酸盐的土壤细菌
- Experimental studies were carried out on the purification of eutrophic lake water by simulative dynamic experiment using immobilized nitrogen cycle bacteria. 研究结果表明,富营养化湖水经固定化氮循环细菌净化后,总氮下降72。
- The studies on the biogeochemistry of carbon and nitrogen, carbon and nitrogen cycle in forest ecosystems, or photosynthates supply for nitrogen assimilation and metabolism of plant indicated that carbon and nitrogen could influence each other. 不论探讨碳与氮之生物地质化学，或森林生态系碳与氮养分循环，甚至整株植物产生光合产物供给氮同化与代谢所需，都显示碳与氮彼此能相互影响。
- The present paper reviews biogeochemical cycle of nitrogen in agroecosystem. 根据国外资料,综述了有机农业土壤氮素流失规律与防止措施。
- Carbon and nitrogen cycling characteristics of dry farmland ecosystem on Loess Plateau. 黄土高原旱塬农田生态系统碳氮循环特征。
- the relation between DON and nitrogen cycle; DON与氮循环的关系;
- modeling of the soil nitrogen cycle 土壤中氮循环模拟
- immobilized nitrogen cycle bacteria 固定化氮循环细菌
- Nutrient-rich, oxygen-poor waters like these support a frenzy of nitrogen cycling, in which certain bacteria use nitrates as an energy source. 富营养化的，缺氧的海水给氮元素的循环提供了一个新的场所，特别的细菌会利用这些硝酸盐作为一种能量的来源。
- Biological nitrogen fixation (BNF) is strongly associated with global nitrogen cycling and global changes due to its effects on release of greenhouse gas. 生物固氮对全球生态系统氮素循环和全球变化有着重要影响,但是由于测定方法的原因,过去对生物固氮,特别是多年生固氮植物的共生固氮的定量研究不足。
- As an effective tracing method, stable nitrogen isotope is significant for studying the nitrogen cycling, especially for identifying source of nitrogen pollution. 稳定氮同位素作为一种有效的示踪手段，在研究氮循环特别是污染氮源的识别方面有重要意义。
- The pedal of a cycle is attached to a crank. 自行车的踏板与曲柄相连。
- Air consists chiefly of nitrogen. 空气主要由氮气组成。
- It is shown from the recent studies that organic nitrogen compounds are an important component of atmospheric nitrogen deposition and make a nonnegligible contribution to the global nitrogen cycling. 摘要近几年的研究表明，有机氮化合物是大气氮沉降的重要组成部分，对全球氮循环的贡献不可忽视。
- It's easier to cycle with the wind behind you. 顺风骑车省力。
- A unit of frequency equal to one cycle per second. 赫兹频率的单位，等于每秒一周
