大規模な森林伐採は,現在の光合成が土壌呼吸を促すことを示している
P Högberg1, A Nordgren, N Buchmann
1Department of Forest Ecology, SLU, Umeå, Sweden. Peter.Hogberg@sek.slu.se
Nature
|July 19, 2001
まとめ
樹木のの実験では,根の呼吸が土壌の呼吸に大きく影響することを明らかにしています. 樹木に光合成物質を供給することは,根と土壌の微生物活性を維持するために極めて重要です.
科学分野:
- 土壌科学 土壌科学
- 植物生理学 植物生理学
- エコロジー エコロジー エコロジー
背景:
- 土壌呼吸は,世界の炭素循環の主要な構成要素です.
- 根の呼吸と微生物の分解が土壌の呼吸に与える相対的な貢献は十分に理解されていません.
研究 の 目的:
- 松の木林の生態系における菌根の根呼吸と異質的土壌呼吸を区別する.
- 光合成物質の供給が根の呼吸に与える影響を定量化するために.
主な方法:
- 大規模なツリーベルト実験は,それぞれ約120本の木がある9つのプロットで実施されました.
- 樹木の包帯には,樹皮をキセラムから取り除き,土壌の干渉なしに,光合成の流れを根元に中断させることが含まれていました.
主要な成果:
- 土壌呼吸は,敷設後1~2ヶ月以内に約54%減少した.
- 土壌呼吸の有意な減少 (37%まで) は,敷き布団の5日後に早めに観察されました.
- 現状の光合成物質が根元に流れる流れは,土壌呼吸の主な原動力として特定されました.
結論:
- 光合成物供給によって駆動される根の呼吸は,土壌呼吸の重要な構成要素です.
- 精密な土壌呼吸モデルでは,光合成と季節的光合成物質の根への配分を考慮する必要があります.
- Girdlingは,根性粉の貯蔵量への依存が増加したため,根性呼吸の保守的な見積もりを提供しました.
関連する概念動画
00:39What is Photosynthesis?
89.1K
Photosynthesis is a multipart, biochemical process that occurs in plants as well as in some bacteria. It captures carbon dioxide and solar energy to produce glucose. Glucose stores chemical energy in the form of carbohydrates. The overall biochemical formula of photosynthesis is 6 CO2 + 6 H2O + Light energy → C6H12O6 + 6 O2. Photosynthesis releases oxygen into the atmosphere and is largely responsible for maintaining the Earth’s atmospheric oxygen content.
89.1K
02:23The Soil Ecosystem
17.5K
Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
17.5K
01:00What is Photosynthesis?
13.9K
All living organisms on Earth are directly or indirectly dependent on photosynthesis. It is the only biological process that can capture energy from sunlight and convert it into chemical energy that every organism can use to power its metabolism. Photosynthesis is also the source of oxygen required by many living organisms.
Types of Organisms Based on their Modes of Nutrition
Broadly, there are two main categories of organisms based on their modes of nutrition — autotrophs and...
Types of Organisms Based on their Modes of Nutrition
Broadly, there are two main categories of organisms based on their modes of nutrition — autotrophs and...
13.9K
01:46The Calvin Benson Cycle
6.3K
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
6.3K
01:29Soil Microbial Ecology
86
Soil microbial ecology is defined by highly diverse, spatially structured communities that drive nutrient cycling, organic matter turnover, and overall ecosystem stability. Although a gram of soil can contain thousands of bacterial and archaeal taxa, the ecological processes they mediate are even more crucial for sustaining terrestrial life.Microhabitats and NichesSoil is a heterogeneous mixture of minerals, organic matter, water, and air. Microbes inhabit distinct microhabitats formed by...
86
01:27Microbes and Climate Change
100
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...
100