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- 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。
- Ecosystem element balance has been a main focus of global change ecology and biogeochemical cycle research. 摘要生态系统元素平衡是当前全球变化生态学和生物地球化学循环的研究热点和焦点。
- Knowledge about biogeochemical cycle and environmental effect of antimony are summarized, and the scientific problems are analyzed. 为了揭示锑的全球性污染程度、循环过程及其对生态环境的影响，急需开展深入研究。
- Now, more and more scientists pay their attention to the effects of dam reservoirs on the biogeochemical cycle of riverine nutrients and succedent aquatic ecological problems. 最近,水坝拦截对河流生源要素生物地球化学循环的影响及其引起的相关水环境生态问题引起越来越多的科学家们的关注。
- Biogeochemical cycle The movement of chemical elements from the physical environment into organisms and back to the environment in a more or less circular pathway. 生物地球化学循环：化学元素从物理环境进入生物体，再通过一条或多条循环途径返回物理环境的运动。
- Two simple biogeochemical cycle models(PM and CM) were developed to demonstrate the influence of chromium on the biogeochemical cycle from human activities in this paper. 通过建立2个简单的铬生物地球化学循环模型PM和CM,来说明人类工业活动对铬的生物地球化学循环的影响。
- It discusses chemi cal forms, availability and biogeochemical cycle of selenium, and also analyses the relations between selenium and endemic disease and its important role in env ironment. 讨论了硒的形态及影响其生物有效性的因素、硒的生物地球化学循环；分析了硒与地方病的关系以及它在生态环境中所起的重要作用。
- In addition, its role in biogeochemical cycling is equally significant. 此外，它在生物地球化学循环方面也具有同样的重要作用。
- One is the understanding of biogeochemical cycles of closed systems. 其一是对闭合系统的生物地球化学循环的理解。
- To study the biogeochemical cycle of phosphorus, it is very important to accurately determine the concentration of orthophosphates in the surface of oceans, especially oligotrophic open-oceans. 痕量活性磷分析是探索海洋，特别是寡营养海区生物地球化学过程的关键。
- This text summarizes the current status of and advances in nitrogen biogeochemical cycling and the possible problems. 文章全面综述了氮素生物地球化学过程研究的现状与进展及其可能存在的问题。
- Mason R P，Fitzgerald W F，Moral MM.The biogeochemical cycling of element mercury:anthropogenic influences [J]. 黄永键，周蓉生，张成江，等.;大气环境中汞污染的研究进展[J]
- Finally, the biogeochemical cycling model of organic related particles is put forward. 并提出了河口有机性颗粒的生物地球化学循环模式。
- The advances in the studies of methyl chloride biogeochemical cycling are reviewed. 摘要对氯甲烷的海洋生物地球化学循环的研究进展进行述评。
- biogeochemical cycle of pollutants 污染物生物地球化学循环
- There are four major processes in biogeochemical cycling: nitrification fixation;organic nitrogen ammonification;nitrification, and denitrification. 这一地区氮的生物地球化学循环包括:生物固氮、有机氮的氨化、氮的硝化、反硝化等4个主要过程。
- Because of the special physiological and ecological characteristics, Synechococcus spp. plays an important roles in global climate changes and biogeochemical cycling. 摘要聚球蓝细菌因其特殊的生理生态特点，决定了其在全球气候调节、生物地球化学循环中重要地位。
- Wetlands have unique biogeochemical cycles with many chemical transformations and chemical transport processes that are not shared by many other ecosystems. 摘要湿地有其独特的生物地球化学循环，其间许多化学迁移和转化过程不为其它生态系统所共享。
- The distributions and functions of various forms of nitrogen in the biogeochemical cycling in the southern Yellow Sea surface sediments were investigated. 本文报道了南黄海表层沉积物中不同形态氮的区域分布特征及其在生物地球化学循环中的作用。
- The course covers productivity and biogeochemical cycles in ecosystems, trophic dynamics, community structure and stability, competition and predation, evolution and natural selection, population growth and physiological ecology. 课程包含生态系之生产力与生物地质化学循环、营养动力学、群落结构与稳定性、竞争与捕食、演化与天择、族群成长，及生理生态学。
