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Scarification of lodgepole pine cut-over areas using a 4-chain drag scarifier was started in the Nelson District in 1972. The first six areas treated were monitored intensively to determine both the effectiveness of the technique in inducing natural regeneration, and the operational limitations.
Seedbed and cone supply surveys were conducted concurrently, with an investigation into the seed quality on the first area. Up to three regeneration surveys were made using milacre plots, on each of the areas scarified, starting two years after scarification.
On all the areas scarified, with one exception. the cone supply was judged to be not limiting to successful regeneration. The one excepted area had fewer than 50% of the plots with one or more cones and an average of only 9 cones per m2.
Of greater significance in the success of. scarification is the delay between logging and scarification. Most of tbe scarified areas that failed to meet administrative stocking standards were areas where there was a delay over the summer before scarification was carried out, thus permitting the serotinous cones to open and disperse seed onto an unreceptive seedbed.
There was a strong relationship between the stocking level and the degree of disturbance. A large degree of disturbance was the factor that enabled two of the areas on which there was a delay in scarification to reach satisfactory stocking levels. It was estimated that an additional 20 to 25% disturbance was required to reach a comparable stocking level on these delayed scarification areas.
An ironical conflict was observed in that the areas most in need of scarification were winterlogged areas, but in many cases these were areas with higher stumps which restricted vehicle movement and limited the degree of scarification.
Small cut blocks, heavy slash, residual stocking and steep slopes were all encountered, and were all found to be limiting to scarification, resulting in .undesirably high costs. Under optimum conditions, it was found that wheeled skidders could easily pull the reduced scarifier (two chains on one 1 boat, as opposed,to four chains behind three boats) and achieve a good degree of disturbance at an acceptable cost. In all cases, the aim of scarification was to achieve 100% coverage. This resulted in about 60 to 85% disturbance.
More information can be found in Research Note 82, "Drag Scarification Trials in Lodgepole Pine Logging Slash in the Nelson Forest District of British Columbia, by C.F. Thompson. This can be obtained from the Information Division, B.C. Forest Service, Legislative BUildings, Victoria, B.C. V8V 1X5.
[Abstract contains full text of memo.]
BC Forest Service - Research Division. 1978. Drag scarification trials in lodgepole pine logging slash in the Nelson Forest District of British Columbia. British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development. Research Memo (FLNRORD). RM25
Topic: FLNRORD Research Program
Keywords: FLNRORD, Research Memo, British Columbia
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