Revisiting the relative growth rate hypothesis for gymnosperm and angiosperm species co-occurrence

Piper, Frida I. and Hoch, Gunter and Fajardo, Alex. (2019) Revisiting the relative growth rate hypothesis for gymnosperm and angiosperm species co-occurrence. American Journal of Botany, 106 (1). pp. 101-112.

Full text not available from this repository.

Official URL: https://edoc.unibas.ch/69865/

Downloads: Statistics Overview


Premise of the Study It is unclear to what extent the co-occurrence of angiosperm and gymnosperm species in some marginal ecosystems is explained by reduced growth in angiosperms due to carbon (C) limitation and by high stress tolerance in gymnosperms associated with lack of vessels and resource conservation. Methods We examined growth patterns and traits associated with C balance in four evergreen angiosperm species (including one vesselless species, Drimys winteri) and three gymnosperm tree species of a cold-temperate rainforest in southern Chile. We measured the mean basal area increment for the first 50 (BAI(50)) and the last 10 years (BAI(10)), wood density, leaf lifespan, and nonstructural carbohydrate (NSC) concentrations in different organs. Key Results BAI(50) was 6-fold higher in angiosperms than in gymnosperms and ca. 4-fold higher in Drimys than in the fastest-growing gymnosperm. BAI(10) and aboveground NSC concentrations were significantly higher and leaf lifespan lower in angiosperms than in gymnosperms; these differences, however, were largely driven by the slow growth and low NSC concentrations of the Cupressaceae species (Pilgerodendron uviferum), while the two Podocarpaceae had BAI(10) and NSC concentrations similar to angiosperms. In angiosperms, NSC and starch concentrations were generally higher in species with lower BAI(10), indicating no severe C limitation. Conclusions The co-occurrence of angiosperms and gymnosperms in cold-temperate rainforests of southern Chile is not explained by growth disadvantages and C limitation in angiosperms. Long leaf longevity, but not lack of vessels, appeared to favor resource conservation and C balance in some gymnosperms (Podocarpaceae).
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:Hoch, G√ľnter
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Botanical Society of America
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:07 Aug 2020 13:27
Deposited On:07 Aug 2020 13:27

Repository Staff Only: item control page