Fire frequency SBPS Chilcotin Fire Regime Sample Clauses

Fire frequency SBPS Chilcotin Fire Regime. The Chilcotin fire history shows numerous small to medium fires occurring frequently, with very large fires occurring every 40-100 years (Xxxxxxx et al. 2002 pg 50). This pattern of a few large fires and many more small fires is also noted and cited in Xxxxxxx 1995. Xxxxxxx et al. (2002 pg 42, 43) also notes that 43 fire years were detected between 2001- 1869 (1 fire in 3 years). Twelve of the fire years in the same period were noted to be major fire years with each burning more than 10, 000 ha (1 fire in 11 years). A total of 91% of the forest stands in the study area originated during or since the 1869 fire year (Xxxxxxx et al. 2002 pg 42). Guideline #: SBS/SBPS 1 Management Guideline Title: Log Flow Type: Administration Research Finding: Natural disturbance patterns do not occur uniformly across the landscape. Major disturbance years were noted to occur periodically with areas of concentrated disturbance occurring locally across the landscape. Support: Strongly supported. Guideline: Harvesting can emulate disturbance patterns across the landscape by concentrating efforts in a small part of the landscape as large periodic fires would have. Harvesting in these areas should be of short duration and then the general area should be left for a period of years if possible. There can be many small areas active at any one time. Bark beetle salvage could be incorporated into areas of concentrated harvest. Epidemic bark beetle infestations across the landscape may complicate harvest planning to emulate natural disturbance patterns. It will be impossible to incorporate the full RNV which includes up to 50% of the study area being subject to fire in a single year, as this would make it impossible to balance timber flow to the processing facility. The concept to be addressed by the narrower managerial range of variability is that timber flow should not be based on small annually uniform amounts from as many places on the landscape as possible. Further Research: None. Two fire years of particular note, 1869, and 1922 each burned approximately 50% of the Chilcotin study area. These fire years would have produced massive fires in which the combined burned area would have approached 150, 000 ha in one year. There has been correlation expressed by very narrow tree growth rings dating to the above significant fire years that indicate severe drought conditions in 1869 and 1922. There is some evidence of another major fire year occurring in 1772 as well, but due to the data ...