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- The present paper reviews biogeochemical cycle of nitrogen in agroecosystem. 根據國外資料,綜述了有機農業(yè)土壤氮素流失規律與防止措施。
- Ecosystem element balance has been a main focus of global change ecology and biogeochemical cycle research. 摘要生態(tài)系統元素平衡是當前全球變化生態(tài)學(xué)和生物地球化學(xué)循環(huán)的研究熱點(diǎn)和焦點(diǎn)。
- Knowledge about biogeochemical cycle and environmental effect of antimony are summarized, and the scientific problems are analyzed. 為了揭示銻的全球性污染程度、循環(huán)過(guò)程及其對生態(tài)環(huán)境的影響，急需開(kāi)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,水壩攔截對河流生源要素生物地球化學(xué)循環(huán)的影響及其引起的相關(guān)水環(huán)境生態(tài)問(wèn)題引起越來(lái)越多的科學(xué)家們的關(guān)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. 生物地球化學(xué)循環(huán)：化學(xué)元素從物理環(huán)境進(jìn)入生物體，再通過(guò)一條或多條循環(huán)途徑返回物理環(huán)境的運動(dòng)。
- 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. 通過(guò)建立2個(gè)簡(jiǎn)單的鉻生物地球化學(xué)循環(huán)模型PM和CM,來(lái)說(shuō)明人類(lèi)工業(yè)活動(dòng)對鉻的生物地球化學(xué)循環(huán)的影響。
- 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. 討論了硒的形態(tài)及影響其生物有效性的因素、硒的生物地球化學(xué)循環(huán)；分析了硒與地方病的關(guān)系以及它在生態(tài)環(huán)境中所起的重要作用。
- In addition, its role in biogeochemical cycling is equally significant. 此外，它在生物地球化學(xué)循環(huán)方面也具有同樣的重要作用。
- One is the understanding of biogeochemical cycles of closed systems. 其一是對閉合系統的生物地球化學(xué)循環(huán)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，特別是寡營(yíng)養海區生物地球化學(xué)過(guò)程的關(guān)鍵。
- This text summarizes the current status of and advances in nitrogen biogeochemical cycling and the possible problems. 文章全面綜述了氮素生物地球化學(xué)過(guò)程研究的現狀與進(jìn)展及其可能存在的問(wèn)題。
- Mason R P，Fitzgerald W F，Moral MM.The biogeochemical cycling of element mercury:anthropogenic influences [J]. 黃永鍵，周蓉生，張成江，等.;大氣環(huán)境中汞污染的研究進(jìn)展[J]
- Finally, the biogeochemical cycling model of organic related particles is put forward. 并提出了河口有機性顆粒的生物地球化學(xué)循環(huán)模式。
- The advances in the studies of methyl chloride biogeochemical cycling are reviewed. 摘要對氯甲烷的海洋生物地球化學(xué)循環(huán)的研究進(jìn)展進(jìn)行述評。
- biogeochemical cycle of pollutants 污染物生物地球化學(xué)循環(huán)
- There are four major processes in biogeochemical cycling: nitrification fixation;organic nitrogen ammonification;nitrification, and denitrification. 這一地區氮的生物地球化學(xué)循環(huán)包括:生物固氮、有機氮的氨化、氮的硝化、反硝化等4個(gè)主要過(guò)程。
- Because of the special physiological and ecological characteristics, Synechococcus spp. plays an important roles in global climate changes and biogeochemical cycling. 摘要聚球藍細菌因其特殊的生理生態(tài)特點(diǎn)，決定了其在全球氣候調節、生物地球化學(xué)循環(huán)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. 摘要濕地有其獨特的生物地球化學(xué)循環(huán)，其間許多化學(xué)遷移和轉化過(guò)程不為其它生態(tài)系統所共享。
- The distributions and functions of various forms of nitrogen in the biogeochemical cycling in the southern Yellow Sea surface sediments were investigated. 本文報道了南黃海表層沉積物中不同形態(tài)氮的區域分布特征及其在生物地球化學(xué)循環(huán)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. 課程包含生態(tài)系之生產(chǎn)力與生物地質(zhì)化學(xué)循環(huán)、營(yíng)養動(dòng)力學(xué)、群落結構與穩定性、競爭與捕食、演化與天擇、族群成長(cháng)，及生理生態(tài)學(xué)。
