Girdling will stop any sap from rising by the time you're ready to cut in the spring. Sap begins way earlier than the first signs of leaves beginning to bud out. (Just look at when maple sap is started to be collected) The tree should be lighter come harvesting time, and by leaving stand, keeps it away from the soil while it begins to cure, vs dragging a freshly cut log through the dirt and to the racks. Probably won't help with peeling in that relatively short period of time. Let them stand through two Winters, and it would probably be easier.
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