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Table 2 Historical fire severity proportions and maximum high-severity fire patch sizes in mixed-conifer and ponderosa pine forests, Sierra Nevada management region.

From: Accommodating Mixed-Severity Fire to Restore and Maintain Ecosystem Integrity with a Focus on the Sierra Nevada of California, USA

Study Study area size (ha) Fire severity (%) Time period (yr) Maximum high-severity patch size (ha)
Low Moderate High
Beaty and Taylor (2001)1 1 587 1 to 60 14 to 47 6 to 86 43 no data
Bekker and Taylor (2001) 2 042 2 to 4 35 to 44 52 to 63 75 no data
Baker (2014) 330 000 13 to 26 42 to 48 31 to 39 110 9 400
Hanson and Odion (2016a, b) 65 296 no data no data 22 60 697
Leiberg (1902)2 1 193 166 no data no data 20 100 160 00
Stephens et al. (2015) 11 500 no data no data 1 to 6 20 to 30 no data
  1. 1 Fire severity percentages vary by slope position and aspect.
  2. 2 Does not include high-severity fire patches <32.4 ha, so actual percent high-severity fire would be higher, if patches <32.4 ha had been mapped. Historical high-severity fire mapped polygons are from Leiberg (1902), and analysis of high-severity fire percent by forest type is from Hanson (2007), based on Leiberg (1902).