wilding pines

Effects of tree control method, seed addition, and introduced mammal exclusion on seedling establishment in an invasive Pinus contorta forest

Pinus contorta is a widespread and ecologically damaging invasive tree in the southern hemisphere. Land managers want control methods that limit reinvasion by P. contorta and promote the recovery of native plant communities and ecosystem functions. Recovery of native vegetation may be slow if native seed supply is limited and/or introduced mammals destroy seeds and seedlings. We investigated how tree control method (felling or poisoning), seed addition, and exclusion of introduced mammals affected subsequent seedling establishment in montane stands of invasive P.

Native plant species richness in non-native Pinus contorta forest

Pinus contorta (lodgepole pine) is invasive in many southern hemisphere countries, having spread extensively from original plantings. It is widely controlled to limit its spread and negative impacts, and is generally assumed to have little value for native plant biodiversity. We surveyed vegetation in two stands of montane wilding P. contorta forest, and recorded a subcanopy of more than 50 native plant species from 35 genera, including trees, shrubs, ferns, and orchids.