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Title: Effect of lianas on tree regeneration in tropical rain forest
Author: Aceves, Mariana Tarin Toleda
ISNI:       0000 0001 3392 9359
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2006
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This study analyzed the interaction between lianas and tree seedlings in contrasting canopy openness environments. For this purpose tree and liana seedlings with distinct light requirements were planted in large and small gaps and in the forest understorey in a tropical moist semideciduous forest in Ghana. The competition for above- and below-ground resources between liana and tree seedlings was also evaluated under two levels of irradiance (7 and 27% PAR) in a shadehouse environment. The rates of growth and photosynthetic response to changes in irradiance were also compared between liana and pioneer tree seedlings in a greenhouse. The data showed that canopy openness moderated the interaction between liana and tree seedlings. The direction of the interaction was both liana and tree species specific. Liana competition effects were stronger in the sites with greater canopy openness and on the growth of the non-pioneer light demander tree, while the pioneer and non-pioneer shade bearer trees were less affected. By having differential effects on the trees, lianas could indirectly promote the regeneration of both the pioneers and the more shade tolerant species. The competition for below-ground resources had the main effects on the interaction within the first year. An increase in the effects of the above-ground competition could be expected in later years. The photosynthetic response to the increase in irradiance was similar among pioneer trees and liana species. The results indicated that lianas can limit the regeneration in big forest canopy gaps in tropical forests by outcompeting tree seedlings. Lianas might affect the forest community by altering the competitive ability of tree species during regeneration.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available