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Braided rivers: This project uses the unique structure of braided rivers (which include parallel channels with low and high flows and dry gravel bars) to understand how the greenhouse gas nitrous oxide is produced and emitted.
Funded by the Royal Society Te Apārangi's Marsden Fund.
Temperate rainforests: Old growth forests on the west coast of Aotearoa New Zealand's South Island provide a lens to understand how ecosystems supply, retain, and recycle nitrogen. We are working with the University of Copenhagen to quantify the extent of moss-mediated nitrogen fixation in these super-humid (up to 16 m of rain per year), carbon-rich landscapes.
Funded by the Royal Society Te Apārangi's Catalyst Fund.
Artificial waterways: We are investigating whether artificial waterways (ranging from agricultural drains and ditches to wastewater treatment wetlands) have a 'carbon footprint' - and what we can do to change this. For instance, do riparian plantings decrease greenhouse gas emissions from drains? Current work is being carried out in collaboration with Canterbury land owners and the Christchurch City Council.
Intermittent streams: Over 50% of global waterways run dry every year (see our recent review highlighting the role non-perennial rivers play across the Australian continent). This project aims to understand how wetting and drying patterns in streams affect their 'carbon footprint' (how much carbon and nitrogen they emit as greenhouse gasses methane, carbon dioxide, and nitrous oxide).
In collaboration with Southern Cross University's Centre for Coastal Biogeochemistry. Funded by by the Australian Research Council and GeoLINK.
Coastal wetlands: This work aims to understand the contribution of highly productive coastal wetlands (e.g., salt marshes) to both reactive nitrogen attenuation and nitrous oxide emissions, with a particular focus on the subtropical waters around southeastern Queensland.
In collaboration with Southern Cross University's Centre for Coastal Biogeochemistry and the University of Western Australia. Funded by by the Australian Research Council and Healthy Land & Water.
Organic nitrogen: The vast majority of reactive nitrogen on land is organic, but its movements and environmental role are largely unknown. This likely reflects the historical difficulty in deciphering the multiplicity of organic nitrogen compounds, which gave the false impression it was effectively inert. I aim to understand the role of organic compounds both for soil nitrogen fertility and the transfer of nitrogen from land-to-water in both natural and managed systems.
Students interested in contributing to any of these research areas are encouraged to contact me directly. Note that funded postgraduate student opportunities generally depend on external grant timelines - see ES-jobs-net, the AGU job's site, or the Critical Zone Exploration Network notice board for current opportunities.
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