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A method to evaluate enhanced rock weathering using intact soil monoliths under field conditions
Caio F Zani1,2, Arlete S Barneze1,2, Gerlinde B De Deyn3
1School of Natural and Environmental Sciences, Newcastle University, Kings Road, Newcastle upon Tyne, England NE1 7RU, United Kingdom.
Methodsx
|October 11, 2024
Summary
A new method uses in situ soil monoliths to accurately measure carbon dioxide removal from enhanced rock weathering. This technique provides reliable field data for verifying carbon dioxide removal strategies.
Area of Science:
- Environmental Science
- Soil Science
- Geochemistry
Background:
- Enhanced rock weathering (ERW) is a promising carbon dioxide removal (CDR) strategy.
- Accurate field measurement, monitoring, and verification (MMV) of CDR efficacy, especially for ERW, is challenging.
- Existing methods for soil water collection can be affected by external environmental factors.
Purpose of the Study:
- To present a novel, robust, and cost-effective method for collecting soil monoliths in situ.
- To enable accurate collection and analysis of soil leachate for estimating ERW carbon dioxide removal.
- To facilitate the validation of ERW efficacy models under field conditions.
Main Methods:
- Installation of intact soil monoliths within a buried apparatus.
- Extraction of monoliths using polyvinyl chloride (PVC) pipes.
- Collection of soil leachate via a buried system with a sampling tube for surface retrieval.
Main Results:
- The method allows for undisturbed collection of soil water draining through monoliths.
- Experimental trials over 6 months with 36 monoliths confirmed the system's validity.
- Enables precise chemical analysis of leachate for solute transport and ERW estimation.
Conclusions:
- The described in situ soil monolith method offers a reliable approach for MMV of ERW.
- This technique overcomes limitations of above-ground apparatuses by maintaining natural soil conditions.
- Facilitates accurate data collection crucial for advancing CDR strategies and climate change mitigation efforts.
Keywords:
Carbon cyclingIntact soil monolith for enhanced rock weathering evaluation under field conditionsMeasurementMonitoringNutrient cyclingRockdustSoil leachatesVerificationWater balanceMore Related Videos
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