土壌からの酸化窒素排出量:作物栽培の見直し,プロセスベースのモデルにおけるその検討
John Kormla Nyameasem1, Sabine J Seidel2, Milena Ulrich1
1Institute of Crop Science & Resource Conservation (INRES), Crop Science Group, University of Bonn, Bonn, Germany.
The Science of the total environment
|February 15, 2026
まとめ
バイオカルや阻害剤の使用などの農業慣行により,酸化窒素 (N2O) の排出量が減少します. しかし,農作物のモデルは,持続可能な農業のためのこれらの影響を正確に反映するために改善する必要があります.
科学分野:
- 農業科学 農業科学とは
- 環境科学 環境科学
- 気候科学 気候科学
背景:
- 酸化窒素 (N2O) は強力な温室効果ガスであり,その主要な人為的な源は農業である.
- 農業によるN2O排出量の正確な推定,予測,緩和は,大きな課題に直面しています.
研究 の 目的:
- N2O排出量に対する農業慣行の影響を二次メタ分析を通じて合成し,定量化する.
- プロセスベースの作物モデルがN2O排出量と関連する農業慣行をどのように表すかを評価することによって,研究のギャップを特定する.
主な方法:
- N2O排出に関する134のフィールド実験と108のモデリング記事の二次メタ分析を実施しました.
- 観察されたN2O排出量に対する様々な農業慣行の影響に関する要約調査結果.
- プロセスベースの作物モデルの中でこれらの慣行の含みと表現を評価しました.
主要な成果:
- バイオカル,窒素化/ウレアゼ阻害剤,肥料率の低下,制御放出肥料,深層埋立,滴水灌などの慣行により,N2O排出量が一貫して減少しました (7-29%).
- 農作物の残留物の追加により,N2Oの排出量が増加しました.
- 多くのモデルには作物回転や肥料管理などの慣行が組み込まれているが,窒素変換に対する阻害剤や直接的なバイオカル効果の含有は限られている.
結論:
- いくつかの農業慣行は,N2Oの排出量を効果的に軽減し,持続可能な農業への道を提供しています.
- 現在のプロセスベースの作物モデルは,さまざまな農業管理シナリオの下でN2O排出を正確にシミュレートするために,大幅な改善を必要としています.
- 強化されたモデリングは,気候変動の緩和と作物生産性のバランスをとる作物システムの設計に不可欠です.
さらに関連する動画
関連する概念動画
01:20Overview of Nitrogen Metabolism
11.5K
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...
11.5K
02:35Key Elements for Plant Nutrition
24.4K
Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
24.4K
01:49The Nitrogen Cycle
60.8K
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...
60.8K
02:11The Roles of Bacteria and Fungi in Plant Nutrition
47.5K
Plants have the impressive ability to create their own food through photosynthesis. However, plants often require assistance from organisms in the soil to acquire the nutrients they need to function correctly. Both bacteria and fungi have evolved symbiotic relationships with plants that help the species to thrive in a wide variety of environments.
47.5K
01:22Inorganic Nitrogen Assimilation
585
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
585