leave trees

17:44 Jul 13, 2012 

15.2 Leave Tree Considerations

Leave trees may be left in a variety of configurations in harvest units. These may be dispersed or clumped. When clumped they may be in a "wedge" pattern from the edge of the unit or a clump or clumps within the unit. These clumps may be left at the same density as the original stand or may by thinned. The question of how to treat the leave trees in the stand changes with both stand characteristics, such as density (tpa) and height:diameter ratio (H/D), as well as which leave tree configuration fits best with the type of harvest system to be used in the unit.

15.2.1 Silvicultural Considerations

Stand characteristics, especially the height:diameter ratio (H/D) can greatly effect which leave tree can be effectively used in an area. If the stand is very dense with a high H/D, 100 or higher, it is very likely that trees left in dispersed retention may blow over due to small root wads or break due to rain or snow loads on their crowns. This defeats the purpose of the leave trees if they are doomed to be windthrown or broken. An effective strategy in this case would be to clump the leave trees, especially if they can be sheltered from the wind in

17:43 Jul 13, 2012 

15 Leave Trees: Why and How


15.1 Leave Trees

Both the Washington State Forest Practices Rules (FPR), for non federal forest lands, and the Washington State Department of Natural Resources (DNR) Habitat Conservation Plan (HCP), for forest lands managed by the DNR, call for leaving a certain minimum number of trees per acre after timber harvesting. The FPR calls for five trees per acre to be left as wildlife reserve trees. Two of these shall be 10 or more feet in height and 12 or more inches in DBH. The remaining three shall be 30 or more feet in height and 10 or more inches in DBH with 1/3 if their height in live crown. The leave trees may be dispersed throughout the unit of clumped for operational efficiency but at point in the unit shall a reserve tree area be more than 800 feet from another wildlife reserve tree area (WAC 222-30-020 (11)). The Interim Implementation Procedures used in Department of Natural Resources Habitat Conservation Plan Implementation Training call for retaining a total of eight trees per acre. There should be two trees per acre that have structural characteristics important to wildlife. There should be one tree per acre from the largest diameter

17:15 Jul 13, 2012 

Jairo, para mí es una especie de árbol.. ¿tal vez los árboles que no pierden sus hojas? (tienen un nombre específico que no recuerdo, y estoy con poco tiempo...pero tal vez te sirva para investigar por ese lado) Suerte!