一个典型的高原深湖的有机碳沉积超过150年的时间
Chungui Yu1, Shanmeng Han2, Xuetao Guo2
1Center for Water and Ecology, State Key Laboratory of Regional Environment and Sustainability, School of Environment, Tsinghua University, Beijing 100084, PR China.
Water research
|June 20, 2025
概括
湖泊中的有机碳沉积对陆地生态系统至关重要,受气候变化和人类活动的影响. 海湖是成海湖的一个.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 古气候学 古气候学
背景情况:
- 湖泊通过有机碳 (OC) 沉积,代表了大量的陆地碳池.
- 了解OC池的动态对于评估气候变化和人为影响至关重要.
- 成海湖是研究这些过程的关键研究地点.
研究的目的:
- 系统地调查成海湖有机碳沉积的分布,特性和来源.
- 分析气候和人类活动如何影响OC沉积模式随着时间的推移.
- 为高原湖碳循环和管理提供科学参考资料.
主要方法:
- 使用同位素和化学生物标志物来分析OC沉积.
- 雇佣了24个指标指标进行综合评估.
- 检查了湖泊沉积物核心,以确定OC分布和特征.
主要成果:
- OC沉积显示了稳定的底层 (48.8-38.4厘米),中层 (38.4-16.8厘米) 和表面层 (16.8-0厘米) 的增加趋势.
- OC沉积率从底层的低于5.00 gm-2yr-1增加到上层的5.0021.87 gm-2yr-1.
- 底层沉积物层呈现出更高的芳香性和疏水性;酸,酸和类似蛋白质的成分增加到表面.
- 陆地植物 (47.782.0%) 是主要的OC来源,C3植物主导了底层,而微生物和藻类在上层更为重要.
- OC沉积的波动与变暖和人为干扰有关.
结论:
- 由于环境变化和人类活动,成海湖的有机碳沉积量发生了显著变化.
- 来自植物的有机物是主要的贡献者,随着时间的推移观察到来源的变化.
- 这些发现为管理高原湖泊生态系统,肥胖化和碳排放提供了关键的见解.
更多相关视频
14:38Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
Published on: April 20, 2012
11.5K
08:09Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management
Published on: September 12, 2017
11.9K
相关概念视频
The Carbon Cycle
40.1K
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.
40.1K
Global Climate Change
24.8K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.8K
The Phosphorus Cycle
39.0K
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.
39.0K
The Fossil Record
25.7K
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
25.7K
What are Biogeochemical Cycles?
34.5K
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.
34.5K
Carbon Skeletons
110.6K
Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
110.6K
