值对中国陆地生态系统的碳,和动态的影响:植被-土壤-微生物驱动因素的分化
Shihang Zhang1, Yusen Chen2, Xiaobing Zhou3
1Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, 610041 Chengdu, China; University of Chinese Academy of Sciences, Beijing 100049, China.
The Science of the total environment
|August 28, 2025
概括
土壤pH显著影响陆地生态系统中的碳,和 (CNP) 循环. 这项研究确定了植物,土壤和微生物中CNP的关键pH值,揭示了中国各地营养动态的关键驱动因素.
科学领域:
- 生态学
- 生物地质化学
- 土壤科学
背景情况:
- 碳,和 (CNP) 循环对于生态系统的生产力和C封存至关重要.
- 土壤的pH值是微生物群落,酶活性和植物生长的关键调节者,影响着CNP循环.
- 虽然已知pH对CNP循环的影响,但线性与非线性动态需要明确的对比.
研究的目的:
- 确定陆地生态系统中植物,土壤和微生物中CNP度的关键pH值.
- 在不同的土壤pH值下确定CNP变化的主要驱动因素.
- 为特定区域的生态系统管理策略提供科学基础.
主要方法:
- 在中国1700个地点的植被,土壤和微生物中对CNP度进行综合分析.
- 使用环境变量和细分回归量化pH值.
- 使用统计测试和空间稳定性检查来确认值显著性.
主要成果:
- 已识别的pH值为:植被的7.0,土壤的5.5,微生物的6.5.
- 在pH 5.5以下,叶面积指数调节了土壤CNP;在pH 5.5以上,土壤质地 (沙子) 是关键.
- 在pH6.5以下,平均年降水调节了微生物CNP;在pH6.5以上,土壤湿度是关键.
- 在pH7.0以下,植物调节pH的CNP;在pH7.0以上,NDVI是关键.
结论:
- 确定了陆地生态系统中CNP管理的关键pH值.
- 突出了随着pH水平的变化而发生的CNP循环的调节驱动因素的转变.
- 提供管理土壤酸化和盐土地的关键指标.
相关概念视频
Factors Influencing Microbial Growth: pH
205
Microorganisms are classified as acidophiles, neutrophiles, or alkaliphiles based on their pH growth preferences, reflecting their adaptations to specific environments. Maintaining a stable intracellular pH is critical for macromolecular stability and enzymatic activity, which can be challenged by external pH variations.Neutrophiles, such as Escherichia coli, grow optimally between pH 5.5 and 8.0. These microorganisms inhabit neutral or slightly acidic environments and employ mechanisms like...
205
Environmental Applications of Microorganisms
222
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...
222
pH Homeostasis
14.6K
Acid-base homeostasis is essential for maintaining normal physiological activities in humans. The pH of various body fluids is strictly regulated because it is critical for the optimal activity of enzymes involved in metabolic reactions. Enzymes are basically proteins, so, any significant change in pH can affect their structure and activity. In humans, pH is regulated using three primary mechanisms— chemical buffer systems, respiratory regulation, and renal regulation.
Respiratory...
Respiratory...
14.6K
The Phosphorus Cycle
38.8K
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.
38.8K
Metabolism of Chemolithotrophs
165
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.
165
pH Regulation in Cells
6.6K
pH plays a critical role in maintaining normal cellular activities. It helps maintain the structure and function of various proteins, dictates the charge on cellular membranes, and is crucial for metabolic reactions inside the cell. Moreover, cells use the energy from the proton motive force to generate ATP.
Cytosolic pH
Under physiological conditions, the cytosolic pH is slightly more acidic than the extracellular pH. However, cells must prevent further acidification of their cytosol to...
Cytosolic pH
Under physiological conditions, the cytosolic pH is slightly more acidic than the extracellular pH. However, cells must prevent further acidification of their cytosol to...
6.6K


