From burned slopes to streams: how wildfire affects nitrogen cycling and retention in forests and fire-prone watersheds

Gustine, R.N., Hanan, E.J., Robichaud, P.R. et al. 2021. From burned slopes to streams: how wildfire affects nitrogen cycling and retention in forests and fire-prone watersheds. Biogeochemistry 157, 51–68, DOI: 10.1007/s10533-021-00861-0.

Keywords: Wildfire, Nitrogen cycling, Nitrogen retention, Water quality, Drinking water

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Abstract: Wildfire is a major driver of nitrogen (N) cycling and export from terrestrial to aquatic systems. While fire is a natural process in many watersheds, it can still degrade water quality by rapidly flushing N to streams. This can be particularly problematic in watersheds that experience high levels of N deposition or where climate change is promoting larger and more severe fires. The extent and duration of postfire N export, and the potential consequences for downstream water quality, depend on how N inputs, internal cycling, and outputs vary before, during, and after fire. Here we review the major factors controlling N cycling and retention in forests and adjacent shrublands, and how fire modifies these controls. We connect burned slopes to streams to describe how fire exports N to aquatic environments. We also consider the implications for municipal watersheds and water resources management. We close by identifying critical knowledge gaps in projecting how fire will affect watershed N cycling and retention in the future

Moscow FSL publication no. 2021c