Conference presentation
Carbon sorption from common agroforestry trees species to pasture soils - implications for climate mitigation
Weaving Soil Science Across Cultures and Environments: A Joint NZSSS and SSA Conference
New Zealand Society of Soil Science and Soil Science Australia
Weaving Soil Science Across Cultures & Environments (Rotorua, New Zealand, 02/12/2024–05/12/2024)
02/12/2024
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Abstract
Increasing soil carbon (C) storage could be an effective climate mitigation strategy and agroforestry is suggested as a strategy to achieve this. For soils to act as an effective C sink, a focus should be put on processes that result in C becoming stabilised as mineral-associated C where it can persist in soils for centuries. Sorption of dissolved organic carbon (DOC) on soil mineral surfaces is one of the primary processes leading to C stabilisation within soils. However, the capacity for different soils to adsorb C substrates depends not only on soil mineral properties but also on substrate chemistry. Therefore, the quality of leaf litter of different agroforestry trees could impact the potential for increasing soil C storage at a given site. To test this, we extracted carbon from the leaves of different tree species to create species-specific DOC solutions. We then conducted a batch sorption experiment using the different DOC solutions to test the interaction of each solution with soils of contrasting mineral properties, and high and low C saturation deficits. This experiment was performed using a fully factorial design enabling all possible interactions to be tested. We found that highly weathered soils with higher iron and aluminium oxide contents adsorbed more C than poorly weathered soils. Differences were also observed in the adsorption potential of the species-specific DOC solutions. Preliminary findings suggest that even in weakly weathered soils, selecting trees for their litter quality has the potential to increase soil C sorption. Therefore, establishing appropriate tree species in agroforestry systems could result in increased stable SOC stocks, contributing to mitigating greenhouse gas emissions.
Details
- Title
- Carbon sorption from common agroforestry trees species to pasture soils - implications for climate mitigation
- Creators
- Katie O'Hagan - Lincoln UniversitySam McNallyNaomi Wells - Lincoln Universitykate OrwinCarol Smith - Lincoln University
- Publication Details
- Weaving Soil Science Across Cultures and Environments: A Joint NZSSS and SSA Conference
- Conference
- Weaving Soil Science Across Cultures & Environments (Rotorua, New Zealand, 02/12/2024–05/12/2024)
- Publisher
- New Zealand Society of Soil Science and Soil Science Australia
- Identifiers
- 991013245449202368
- Academic Unit
- Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Conference presentation