Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Growth rings in Agathis robusta and Araucaria cunninghamii from tropical Australia.

Abstract

A. robusta and A. cunninghamii trees growing in a seasonal tropical climate in N. Queensland produce latewood during cooler and drier periods. Vascular cambium growth rates fluctuate, and slow-growing trees may temporarily have inactive cambium around parts of the trunk so no growth ring is formed. Radiocarbon dating of old Agathis trees indicates that the frequency of ring formation is less than annual.