Early growth and quality of radiata pine in a silvopastoral system in New Zealand.

PERI P.L., MASON E.G.; POLLOCK K.M.; VARELLA A.C.; MEAD D.J.

AGROFORESTRY SYSTEMS

SPRINGER

Año: 2002 vol. 55 p. 207 - 219

0167-4366

The effect of different understories on the early growth and quality of radiata pine in a silvopastoral system was evaluated in Canterbury, New Zealand. Fitted models successfully represented the effect of understorey on the growth (basal area and height) and a quality of trees (diameter over stubs). Basal area, diameter, height and volume growth were affected by understorey competition. Trees growing with no-understorey had 34% and 29% higher volume than trees growing with lucerne and cocksfoot understories, respectively. However, the height of trees at age 10 grown without understorey competition was only 9% and 15% more than trees grown with grass and lucerne understorey, respectively. Understorey competition effects on growth became more evident during the summer and early autumn months when water deficits occurred. There were no interactions between understorey and tree genotype on tree growth. The quality of trees was also affected by understorey competition. While trees grown in bare ground had higher growth than trees grown with understorey competition, they had the poorest stem quality with higher diameters over stubs, branch size, sweep and proportion of stem defects. This will have an impact on the agroforestry system profitability by affecting the net harvest revenue.