在土壤微观结构的层面内,C循环酶在耕地和森林酶中的定位
Anna Yudina1, Olga Ovchinnikova1,2, Vladimir Cheptsov2
1Department of Soil Physics and Hydrology, V.V. Dokuchaev Soil Science Institute, Pyzhovskiy Lane, 7, Building 2, 119017 Moscow, Russia.
Microorganisms
|June 15, 2023
概括
土壤酶活性和微生物多样性因土壤结构和土地利用而异. 物理影响影响酶局部化,不同的酶对耕地与森林土壤中的特定土壤微观结构做出反应.
科学领域:
- 土壤科学 土壤科学
- 微生物学 微生物学
- 生物地质化学生物地质化学
背景情况:
- 土壤微生物和酶活动对土壤功能至关重要,受微观环境条件的影响.
- 在功能评估中,土壤酶的起源和局部化往往被忽视.
- 了解酶活性需要考虑土壤结构和土地使用相互作用.
研究的目的:
- 调查对土壤固体的物理影响对四种水解酶 (β-葡萄糖酶,生物水解酶,基因酶,西兰酶) 的活性的影响.
- 为了确定酶活性和微生物多样性如何在不同的物理影响水平下在耕作和本地虫之间有所不同.
- 探索土壤微观结构组织,土地利用和酶局部化之间的关系.
主要方法:
- 酶活性测定β-葡萄糖酶,蜂基酶,花酶和西兰酶.
- 为评估微生物多样性而在社区一级进行生理分析.
- 对来自耕地和森林虫的土壤样本进行物理冲击 (分散能量) 的受控应用.
主要成果:
- 物理影响显著影响了酶活性,因酶类型和土地用途而异.
- 在耕地Phaeozem中,西兰酶和生物酶的活性达到450-650 J·mL-1的峰值,与初级土壤颗粒有关.
- 森林Phaeozem中的β-glucosidase和Chitinase活性在150 J·mL-1以下是最高的,与微聚合物相关.
结论:
- 土壤微观结构的组织显著影响酶活性和微生物社区的特异性,特别是在较低的组织水平.
- 土地用途之间的酶活性差异表明基质可用性和酶局部化是关键因素.
- 物理影响和土壤结构是土壤酶功能和微生物生态的关键决定因素.
相关概念视频
01:30Environmental Applications of Microorganisms
77
Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
77
01:28Carbon-dioxide Fixation
43
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
43
01:14The Carbon Cycle
38.7K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
38.7K
00:54What are Biogeochemical Cycles?
33.1K
The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
33.1K
01:15Metabolism of Chemolithotrophs
53
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
53
01:21The Phosphorus Cycle
37.7K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
37.7K