In 2006, the Ministry of Environment conducted a preliminary evaluation on wildlife tree retention practices on 20 large cutblocks harvested 2003-2005. These cutblocks were greater than or equal to 100 hectares (gross block area) in size and associated with Mountain Pine Bark Beetle harvest. The project was carried out in the Quesnel, Central Cariboo, 100 Mile House and Chilcotin Forest Districts with 5 blocks per district being sampled. The purpose of the evaluation was to determine if wildlife tree patches and wildlife tree retention practices were providing the range of habitats for those species dependent on wildlife trees and if those practices were consistent with the direction or guidance provided by the Ministry of Forests under the Forest Practices Code of BC Act and in consideration of the Cariboo-Chilcotin Land Use Plan.
For 2007, a random sample of 10 post-harvest cutblocks for each of the Quesnel, Central Cariboo, Chilcotin, and 100 Mile House Forest Districts was generated by the Data and Quality Management Section of the Forest and Range Evaluation Program (FREP). The blocks were identified using harvest date (cutblocks harvested between 2003 and 2006) and cutblock size (greater than 100 hectares of gross area) as the selection criteria. The results of the evaluation showed that the total patch retention area for the 40 sampled blocks was 1251.9 hectares and the total gross cutblock area was 7934 hectares. The percent of wildlife tree patch (WTP) area, inclusive of dispersed retention, ranged from a low of 5% to a high of 63% with an average of 17.3%. Gross cutblock area ranged from 100.8 hectares to 630.6 hectares. The analysis of the 40 sampled cutblocks showed some potential biodiversity strengths and weaknesses (described in the report).
Price, G.. 2009. A Further Evaluation of Wildlife Tree Retention on Large Cutblocks Harvested for Mountain Pine Beetle Salvage - Cariboo Region. Ministry of Environment
Topic: Mountain Pine Beetle
Keywords: MPB, bc, british columbia, beetle kill, species at risk
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