Kernholz von Cupressus lusitanica, C. macrocarpa sowie Leyland- und Ovens-Zypresse und die Bestimmung dessen Dauerhaftigkeit mittels NIR-Spektroskopie | Heartwood of Cupressus lusitanica, C. macrocarpa, Leyland and Ovens cypress and prediction of its durability using near-infrared spectroscopy
2013
Jones, Trevor G. | Low, Charlie B. | Meder, Roger | O’Callahan, Diahanna R. | Milne, Patrick G. | Chittenden, Colleen M. | Ebdon, Nicholas | Dungey, Heidi S.
The heartwood of plantation-grown Cupressus lusitanica, C. macrocarpa, Leyland and Ovens cypress (×Cuprocyparis leylandii and ×C. ovensii) from trials in New Zealand, was evaluated using breast height increment cores and in vitro decay tests with fungal cultures to determine the variation in the heartwood content and natural durability, and its prediction using near-infrared (NIR) spectroscopy. The increment core measurements showed the length of the cores was strongly influenced by the stocking and site, but the heartwood content and weight loss with decay testing were strongly influenced by species and genotype. The heartwood content was consistently high for C. macrocarpa, but varied widely for C. lusitanica, and the Leyland and Ovens cypress clones. The weight loss was similar for the species and cypress clones, with the heartwood classified as very durable and durable, but there were differences in the distributions of less durable heartwood. The NIR calibration models of mass loss with fungal decay testing had ratios of prediction to deviation (RPD) of 1.0–1.3, which suggests the models could be used to segregate the heartwood for high and low values of natural durability.
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