Effects of Early Release on Natural Versus Container Loblolly Pines 12 Years After Field Establishment
نویسندگان
چکیده
Genetically improved, container loblolly pine (Pinus taeda L.) seedlings were compared to natural ly es tabl ished loblol ly seedl ings on a cutoverpine s i te . Crop pines on 6 of 12plots were releasedfrom woody and herbaceous competition within a 2 ft radius of each stem. On release plots, woody competition was controlled by hand-cutting for 5 consecutive yr and herbaceous competition was controlled with herbicidesfor 4 consecutive yr ufterpine establishment. Competition control increased 12 yr survival by 68 percentage points~for natural pines and by 47percentage points for planted pines. Twelve years afterfield establ ishment , mean-tree volume ofplantedpines was no di f ferent than that of natural ly es tabl ished pines . Nevertheless, volume gains of 150% to 200% were achieved within regenerat ion techniques as a resul t of release. South. J. Appl. For. 26(4):173-180.
منابع مشابه
An 8-year field comparison of naturally seeded to planted container Pinus taeda, with and without release
A field study compared genetically improved, container loblolly pines (Pinus taeda L.) with naturally seeded loblolly pines through eight growing seasons on a cutover site in southern Arkansas, U.S.A. Measurement pines on 6 of 12 plots were released from woody and herbaceous competition within a 61-cm radius of each tree stem. On natural pine plots, only lst-year pine seedlings were selected fo...
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