Seasonal and Spatial Fluctuations of Reactive Oxygen Species in Riparian Soils and Their Contributions on Organic Carbon Mineralization.
Fuhao Liu1,2, Zhiqiang Wang1,2, Jing Liu1,2
1College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
Environmental Science & Technology
|April 10, 2024
View abstract on PubMed
Summary
Reactive oxygen species (ROS) are crucial in riparian soils, with concentrations varying seasonally and spatially. These ROS significantly impact organic carbon breakdown and elemental cycles in these vital ecosystems.
Area of Science:
- Environmental Science
- Soil Science
- Biogeochemistry
Background:
- Reactive oxygen species (ROS) are essential in natural biogeochemical processes.
- The spatiotemporal dynamics and production mechanisms of ROS in riparian soils are not well understood.
Purpose of the Study:
- To investigate the seasonal and spatial variations of ROS in the Weihe River riparian zone.
- To identify the key drivers influencing ROS production and distribution.
- To assess the role of ROS in the abiotic mineralization of organic carbon.
Main Methods:
- Continuous monitoring of ROS in riparian soil sites throughout the year.
- Utilizing fluorescence imaging and quantitative analysis for ROS detection.
- Employing structural equation and random forest models to determine influencing factors.
Main Results:
- Superoxide (O2•−) concentrations were 300% higher in summer and autumn.
- Hydrogen peroxide (H2O2) and hydroxyl radical (•OH) peaked in winter at 539.7 and 20.12 μmol kg−1.
- ROS production decreased spatially along the stream.
- Meteorological conditions and soil properties were identified as key drivers.
- Hydroxyl radicals significantly contributed to abiotic organic carbon mineralization (17.5–26.4% of CO2 efflux).
Conclusions:
- Riparian zones are significant, underestimated hotspots for ROS production.
- ROS play a critical role in carbon turnover and elemental cycling in riparian soils.
- Understanding ROS dynamics is crucial for predicting ecosystem functions.
Related Concept Videos
00:54What are Biogeochemical Cycles?
31.6K
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.
31.6K
01:46The 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
00:46Bioremediation
18.3K
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.
18.3K
01:14The Carbon Cycle
37.4K
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.
37.4K