代谢过程驱动了岩河中碳汇/碳源的时空变化
Ningzhe Xi1, Tao Zhang1, Wenyan Zhao1
1Karst Research Team, Chongqing Key Laboratory of Carbon Cycle and Carbon Regulation of Mountain Ecosystem, School of Geography and Tourism, Chongqing Normal University, Chongqing, 40133, China.
Environmental research
|September 11, 2024
概括
卡斯特河流可以在二氧化碳 (CO2) 的来源和沉之间转变. 水中光合作用和河流流量显著影响这种二氧化碳交换,特别是在亚热带地区.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 生态生态学 生态生态学
背景情况:
- 河流二氧化碳 (CO2) 交换对全球碳循环至关重要.
- 由于岩石学和气候因素,卡斯特河二氧化碳动态的时空变化不太清楚.
- 内陆水域是大气碳的重要,但异质的来源.
研究的目的:
- 为了研究二氧化碳的时空变化,在河中沉没/来源.
- 确定这些环境中二氧化碳交换的控制机制.
- 了解河在全球碳预算中的作用.
主要方法:
- 利用了来自中国丽江河52个监测截面的水化和二氧化碳气体同位素数据.
- 在两个不同的季节 (2019年6月和12月) 收集数据以捕捉时间变化.
- 分析了通过水空气界面 (FCO2) 的二氧化碳流量和相关参数,如溶解氧和叶绿素-a.
主要成果:
- 丽江河中的二氧化碳 (FCO2) 流量在-43.77-519.67 mmol/m2·d之间.
- 由于水力动力学和光合作用的影响,河流在6月份 (温度较高) 充当碳源,并在12月份充当碳沉.
- 增强的光合作用与增加的溶解氧和转向二氧化碳吸收的转变相关.
结论:
- 卡斯特河的二氧化碳动态表现出显著的时空异质性.
- 水中光合作用和水力动力学条件是二氧化碳吸收/来源行为的关键驱动因素.
- 亚热带和温带河流,比如丽江河,由于这些联合力量,经常充当二氧化碳沉降的角色.
更多相关视频
11:19Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
Published on: October 21, 2016
11.9K
09:38Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
Published on: January 7, 2019
8.6K
相关概念视频
The Carbon Cycle
37.1K
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.
37.1K
The Calvin Benson Cycle
4.5K
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...
4.5K
What are Biogeochemical Cycles?
31.2K
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.
31.2K
Bioremediation
18.2K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.2K
