The objective of stock type selection is to decide, based on species, site conditions and experience, what seedling characteristics (e.g., height, root collar diameter) will best suit each site. The selection of stock types is an important element in the regeneration process (Figure 1) and is best considered during the development of the silviculture prescription (SP).
Stock type selection directly
Stock type selection has its greatest influence on the establishment and early growth phases of a plantation. With time, however, site conditions will usually assume a more important role in determining stand performance. Selection of an appropriate stock type can help to minimize the effects of site limiting factors on the establishment and early growth of seedlings. Choice of stock type can also significantly impact the length of time to achieve free growing obligations and to satisfy green-up requirements. In addition, choices made at this stage can affect future stand management decisions.
1 SPAR - Seed Planning and Registry System
Figure 1. The relationship of stock type selection to other components of the regeneration system.
Selection at the SP stage integrates harvesting, site preparation, nursery culture, future stand tending practices, and other resource uses, and encourages the prompt regeneration of sites. Stock type selection should also be kept in mind during post-harvest and plantability inspections. Any revisions to the selection should be made prior to the submission or confirmation of a sowing request.
Remember that you are not the only person who has had to select stock for a planting site. Check with others to find out what they have used, why they used it, how they used it, and what happened. For more information, contact your regional reforestation and site preparation forester or nursery services staff. In the northern interior region of B.C., members of the Northern Interior Vegetation Management Association (NIVMA) can query their database for trends in seedling performance by stock type and site characteristics.
The correct stock type decision should be based on site-specific considerations within a set budget. The selection process should consider site preparation, seedling and planting costs, and any commitments made in the SP or within a pest management plan for the site.