Related Experiment Video
Updated: Jun 29, 2025
09:38
Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
Published on: January 7, 2019
8.6K
Organic carbon accumulation in British saltmarshes
Craig Smeaton1, Ed Garrett2, Martha B Koot3
1School of Geography and Sustainable Development, University of St Andrews, St Andrews, United Kingdom.
The Science of the Total Environment
|March 31, 2024
Summary
British saltmarshes store significant organic carbon (OC), crucial for climate regulation. Our study reveals lower OC accumulation rates than global averages, highlighting the need to protect existing carbon stores in these vital coastal ecosystems.
Area of Science:
- Coastal Ecology
- Geochemistry
- Climate Science
Background:
- Saltmarshes are vital coastal ecosystems for carbon sequestration and climate regulation.
- These ecosystems face increasing threats from climate change and human activities.
- Accurate data on organic carbon (OC) accumulation is needed for conservation and carbon accounting.
Purpose of the Study:
- To quantify sedimentation rates and OC densities in Great Britain's saltmarshes.
- To estimate the annual OC accumulation in UK saltmarshes.
- To assess the significance of existing OC stores for climate change mitigation.
Main Methods:
- Field measurements of sedimentation rates and OC densities across 21 saltmarshes in Great Britain.
- Analysis of climatic, geomorphological, oceanographic, and ecological factors influencing saltmarsh function.
- Calculation of total annual OC accumulation and existing OC stocks for UK saltmarshes.
Main Results:
- Saltmarshes in Great Britain accumulate OC at an average rate of 110.88 g C m-2 yr-1.
- This rate is lower than widely used global averages, suggesting an overestimation of northern European saltmarsh contributions.
- GB saltmarshes accumulate an estimated 46,563 ± 4353 tonnes of OC annually, with 5.20 ± 0.65 million tonnes already stored.
Conclusions:
- The annual OC accumulation in UK saltmarshes is lower than previously estimated.
- Protecting the substantial existing OC stores in GB saltmarshes is a priority for climate change mitigation.
- Preserving these stores offers climate benefits through avoided emissions, exceeding the impact of annual OC accumulation.
Related Concept Videos
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
01:27C4 Pathway and CAM
45.5K
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
C4 Pathway
The C4 pathway is used by plants such as...
45.5K
02:02Responses to Salt Stress
13.1K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
13.1K
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