| Titre : |
Ecology and Invasive potential of Paulownia tomentosa (scrulariaceae) in a hardwood forest landscape |
| Type de document : |
Électronique |
| Auteurs : |
A. Christina W. Longbrake |
| Editeur : |
Ohio University |
| Année de publication : |
2001 |
| Importance : |
174 p. |
| Langues : |
Anglais (eng) |
| Catégories : |
[CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes
[CBNPMP-Thématique] Forêts (habitat)
[CBNPMP-Géographique] Amérique du Nord
|
| Mots-clés : |
Paulownia tomentosa (scrulariaceae) |
| Résumé : |
Introduction of non-native species is the oldest form of human-induced global change. From the exchange of agricultural crops and domestic animals, to the accidental introduction of weeds and microbes, non-native species have been incorporated into the floras and faunas of all continents and most oceanic islands. These organisms can have marked effects on ecosystems. I wanted to address the following facets of non-native species invasion: (1) What characteristics of ecosystems make them more susceptible to non-native species invasion? and (2) What characteristics of the invader allow invasion? To address these questions, I used a gradient of anthropogenic disturbance common in southeastern Ohio forests: intact secondary forest, forest edge, and aggrading clear cuts. Paulownia tomentosa is a tree native to Asia and thought to have been introduced to North America in the 1840's. The species has naturalized throughout Appalachia. I studied the growth, allocation, establishment, and seed persistence across habitats. I also became interested in the basic ecology of P. tomentosa, particularly the ability of the species to resprout and phenotypic plasticity in naturalized populations. The most important factors in determining the invasive potential of P. tomentosa were disturbance and herbivory. Paulownia tomentosa is an early successional species that can grow rapidly under high light conditions. Seed ecology suggests that the species can form a persistent seed bank. However, light is required for germination and seeds responded positively to soil disturbance. Large gaps may be sufficient to allow seeds in the seed bank to germinate and grow to the canopy. However, the species is very susceptible to herbivory. Plants had to be protected from mammals in order to persist. Even though above- and below-ground competition affected plant growth and allocation, it did not affect the overall success of plants. Paulownia tomentosa can resprout at an early age and initially invests heavily in below-ground biomass. Naturalized populations showed some variability in traits, particularly in those associated with below-ground biomass and growth of roots. Paulownia tomentosa has potential to remain a part of the mixed mesophytic forests of North America since it can form a seed bank, disperse seeds to great distances, and grow quickly once established. |
| Permalink : |
https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=152516 |
Longbrake, A. Christina W.
, 2001.
Ecology and Invasive potential of Paulownia tomentosa (scrulariaceae) in a hardwood forest landscape.
Ohio University, [S.l.].
174 pp.
|
Ecology and Invasive potential of Paulownia tomentosa (scrulariaceae) in a hardwood forest landscape (2001)
