Assessing giant sequoia mortality and regeneration following high severity wildfire

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1002/ecs2.4789. This is version 1 of this Preprint.

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Authors

David Soderberg, Adrian Das, Nathan Stephenson, Marc Meyer, Christy Brigham, Joshua Flickinger

Abstract

Fire is a critical driver of giant sequoia (Sequoiadendron giganteum [Lindl.] Buchholz) regeneration. However, fire suppression combined with the effects of increased temperature and severe drought have resulted in fires of an intensity and size outside of the historical norm. As a result, recent mega-fires have killed a significant portion of the world’s sequoia population (13 to 19%), and uncertainty surrounds whether severely affected groves will be able to recover naturally, potentially leading to a loss of grove area. To assess the likelihood of natural recovery, we collected spatially explicit data assessing mortality, crown condition, and regeneration within four giant sequoia groves that were severely impacted by the SQF- (2020) and KNP-Complex (2021) fires within Sequoia and Kings Canyon national parks. In total, we surveyed 5.9 ha for seedlings and assessed the crown condition of 1140 trees. To inform management, we used a statistical methodology that robustly quantifies the uncertainty in inherently ‘noisy’ seedling data and takes advantage of readily available remote sensing metrics that would make our findings applicable to other burned groves.
A loss of giant sequoia grove area would be a consequence of giant sequoia tree mortality followed by a failure of natural regeneration. We found that areas that experienced high severity fire (above ~800 RdNBR) are at substantial risk for loss of grove area, with tree mortality rapidly increasing and giant sequoia seedling density simultaneously decreasing with fire severity. Such high severity areas comprised 17.8, 142.0, 14.6, 1.6 hectares and ~90%, ~14%, ~53%, and ~27% of Board Camp, Redwood Mountain, Suwanee, and New Oriole Lake groves, respectively. In all sampling areas, we found that seedling densities fell far below the average density measured after prescribed fires, where seedling numbers were almost certainly adequate to maintain giant sequoia populations and postfire conditions were more in keeping with historical norms. Importantly, spatial pattern is also important in assessing risk of grove loss, and in two groves, Suwanee and New Oriole Lake, the high severity patches were not always contiguous, potentially making some areas more resilient to regeneration failure due to the proximity of surviving trees.

DOI

https://doi.org/10.32942/X2Z883

Subjects

Life Sciences

Keywords

giant sequoia, Sequoiadendron giganteum, high severity wildfire, tree mortality, fire effects, natural regeneration, restoration management, Sequoiadendron giganteum, high severity wildfire, tree mortality, fire effects, Natural regeneration, restoration management

Dates

Published: 2023-05-26 04:36

Last Updated: 2023-05-26 08:36

License

No Creative Commons license

Additional Metadata

Language:
English

Data and Code Availability Statement:
Data are not yet provided because they are currently under review as part of the USGS data release program. After acceptance of this manuscript by the journal and before publication, data will be archived in ScienceBase.