Forestland. Land that is a part of a forest unit actively engaged in the commercial growing of trees under a sound management program. Forestland includes wasteland that is a part of the forest unit, but the wasteland included in the unit must be appraised under the use‑value schedules as wasteland. A forest unit may consist of more than one tract of forestland, but at least one of the tracts must meet the requirements in G.S. 105‑277.3(a)(3), and each tract must be under a sound management program.