Journal Title
Title of Journal: Trees
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Publisher
Springer-Verlag
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Authors: Eduardo González Francisco Antonio Comín Etienne Muller
Publish Date: 2009/11/03
Volume: 24, Issue: 1, Pages: 151-163
Abstract
Populus alba L is an autochthonous species dominating the overstory of the floodplain forests across the Mediterranean region In contrast to some other Populus spp very little is known about its regeneration strategies Poplars yearly disperse huge amounts of wind and waterdispersed nondormant shortlived tiny seeds that need the bare open and moist substrates created by fluvialgeomorphic events to germinate and establish To survive the growing roots must keep pace with the falling water table and associated soil moisture zone Using a greenhouse experimental facility 9dayold P alba seedlings were subjected to five hydrological treatments permanent saturation drawdown rates of 1 25 5 cm day−1 and immediate drainage in two different substrates coarse and sandy and their survival and growth were evaluated Also P alba seed dispersal was monitored in the field and seed germinability and longevity were tested in the laboratory No seedlings survived the water table declines in the coarse substrate although survival was high 85 under saturated conditions In the sandy soil survival was significantly greater in the permanent saturation 87 and 1 cm day−1 88 treatments than in the 25 cm day−1 58 5 cm day−1 25 and immediate drainage 22 treatments The lowest root and shoot growth rates occurred under the saturated and immediate drainage conditions Seed dispersal lasted 6–8 weeks and peaked in midApril initial seed germinability was high 92 and seed longevity was relatively long half viability period 30 days The creation of nursery sites and release of controlled floods in midApril followed by water table declines of less than 1 cm day−1 in coarse substrates and less than 5 cm day−1 in sandy substrates are recommended for enhancing the initial establishment of P alba seedlingsThe authors are grateful to C Aniento A Barcos B Bueno ML Dehesa A Frutos B Gallardo M García M González D Jiménez L Mancebo L Miguel T Pascual S Presa M Trabucchi and A Villarroya for their assistance in the field surveys rhizopods construction seed collection sorting harvest and careful measurements of the seedlings We also express our gratitude to JL Arrúe and D Moret who assessed the designing and manufacturing of the TDR probes and to the Professor CS Crawford and two anonymous reviewers who provided helpful comments on manuscript drafts A Vallejo JA Pescador and all the members of the Field Research Support Unit Estación Experimental de Aula Dei CSIC provided essential logistic support This research was funded by the Department of the Environmental Science Technology and University Aragon Government Research group E61 on Ecological Restoration and Ministry of Science and Innovation of Spain MICINN CGL200805153C0201/BOS The first author was funded by the former Ministry of Education and Science of Spain MEC
Keywords:
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