Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Growth analysis of some Agathis species.

Abstract

Seedlings of Agathis macrophylla and A. robusta ssp. nesophila were grown in a tropical glasshouse near Oxford, England, in either full daylight or partial shade (12% daylight). Both species had similar values of relative growth rate (RGR) and unit leaf rate (NAR) (net assimilation rate). Shading reduced the RGR by about 30% and NAR by about 40% compared to full light, the values in light and shade being n.s.d. In full light, the NAR of the tree seedlings was only 20-33% of that of sunflower (Helianthus annuus) in the same glasshouse, a difference similar to that reported for other woody plants. Results suggest that enrichment planting of Agathis spp. will succeed in fairly small canopy gaps.