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martincolorado | 5 years ago

Agree this is mostly false, and likely not deceptive but fast/sloppy writing. For example, depending on the landscape and forest ecosystem composition, a wildfire could result in the ecosystem becoming a net carbon source. Examples include Ponderosa, Jeffery, and Lodgepole Pine and Douglas fir landscapes in California and Arizona. In a high intensity burn fire where the stand is replaced, it is possible to degrade the soil and emitted soil Carbon through both burning of soil organic matter and subsequent erosion[1][2]. With degraded soil and increasing temperatures the conditions won't be available for Ponderosa, Jeffery, and Lodgepole Pine and Douglas fir to regenerate and the species that succeed them likely don't have the same carbon sequestering potential. This phenomena can be extremely site specific in which former south facing pine stands might not regenerate pine and instead regenerate as chaparral and manzanita (for example, west side Sierra 5000-7000 feet above sea level).

Dying trees and wildfire is especially problematic in Boreal forests in Alaska and Canada[3]. Managing Boreal forests as a carbon sinks is going to be difficult with climate change. In Canada million acre fires are normal as the species composition is susceptible to stand clearing fires and fire intensity can be high resulting in the ecosystem being an atmospheric carbon producing source. Conversely, Redwood forests even at maturity increase their capacity as carbon sinks and are highly resistant to catastrophic fire.[4] So, species composition, soil, and fire influence on whether or not decomposing trees are a carbon sink or source.

Building on the model presented earlier:

CarbonCaptureRateToStopGlobalWarming = growTreesPlantsAndBuryDeadOnes(...params) + newTech(...params)

Replace growTreesPlantsAndBuryDeadOnes with growing fire resistant species that sequester carbon in the soil/biomass at high rates. For example, Redwoods in coastal CA and Oregon.

[1] https://www.firescience.gov/projects/briefs/03-1-1-06_fsbrie... [2] https://www.sciencedirect.com/science/article/abs/pii/S00167... [3] https://link.springer.com/chapter/10.1007/978-981-10-3638-5_... [4] https://www.parks.ca.gov/?page_id=26107

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