化学海洋学 化学海洋学 北太平洋における人為的な窒素の増加
Il-Nam Kim1, Kitack Lee2, Nicolas Gruber3
1School of Environmental Sciences and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea.
まとめ
アジアからの反応性窒素は,北太平洋の窒素濃度を上昇させている. これは,この地域を窒素限度からリン酸限度へと移行させ,海洋の生産性に影響を与える可能性があります.
科学分野:
- 海洋学 海洋学 海洋学
- 環境科学 環境科学
- マリン・ケミストリー (海洋化学)
背景:
- 東北アジアからの人類による活性窒素排出量は増加しています.
- 北太平洋 (NPO) 全体の強化された窒素堆積が観察されています.
- NPOは歴史的に窒素に制限された海洋生態系です.
研究 の 目的:
- NPOにおける上海亜酸塩 (N) 濃度の増加を定量化するために.
- このN増加の空間的分布を,リン酸 (P) に相対的に評価する.
- 主要生産における栄養分比の変化がもたらす影響を理解する.
主な方法:
- 海洋の栄養素濃度 (窒素酸塩とリン酸塩) の分析.
- 大気源からの窒素堆積パターンの評価.
- 栄養素の変化が海洋生態系に与える影響をモデル化.
主要な成果:
- NPO.で,上海の窒素酸塩濃度の検出可能な増加が観察されました.
- リン酸相対の過剰窒素の増加率は,アジア周辺で最も高く (~0.24 μmol/kg/年),東に向かって減少した.
- 結果は,大気中の窒素堆積の分布と一致しています.
結論:
- 人為的な窒素排出は,NPOの栄養バランスを変化させている.
- 窒素の供給量の増加は,以前はN限定であったこの地域での一次生産を向上させる可能性がある.
- NPOにおける窒素制限からリン酸制限への潜在的な長期的移行が示されている.
さらに関連する動画
関連する概念動画
Primary Production
26.2K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
26.2K
Marine Microbial Ecology
56
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
56
Microbes and Climate Change
77
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
77
Freshwater Microbial Ecology
52
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic...
52
The Nitrogen Cycle
61.7K
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
61.7K
Overview of Nitrogen Metabolism
12.7K
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
12.7K


