Realized Gain and Prediction of Yield with Genetically Improved Pinus radiata in New Zealand

• DOI: 10.1093/forestscience/45.2.186
• Publication Date: 2024-04-10T10:24:45Z
• Authors: Susan D. Carson; Oscar Garcia; Judy D. Hayes
• Keywords: Pinus radiata; Radiata

Abstract Pinus radiata D. Don seedlots of varying genetic quality were compared in block-plot genetic-gain trials at 10 locations representing most the site types New Zealand. Permanent sample plots measured annually for growth from age 6-8 yr planting to ages 15-17 (midrotation). Seedlots first-generation open-pollinated seed orchards and a mix crosses that all involved top-performing parent were, respectively, on average 4.5% 5.3% taller had 6% 11% larger mean diameter, 12% 30% more basal area, 15% 34% stem volume than originating mild mass selection harvested stands ("climbing select"). The observed increases quantified as changes rate predicted by preexisting models order account tree size stocking differences. top clone, grew 5.1% faster height, functions area changed 13% 26.4% faster, baseline models, which based climbing select. This implies increased must be taken into obtain accurate prediction gain volume. incorporation these rates stand "genetic-gain multipliers" extrapolate predictions genetically improved beyond sites, silvicultures, represented is discussed. For. Sci. 45(2):186-200.