Global ETD Search

1	Intraspecific Trait Plasticity in Coffee Agroforestry Systems of Costa Rica Gagliardi, Stephanie 18 March 2014 (has links) Although a common plant response to environmental gradients, leaf trait plasticity is often uncharted in agroforestry systems. The objective of this study was to examine the effect of a i) local-scale gradient (light, nutrients) induced by shade tree diversity and ii) large-scale gradient (climato-edaphic) induced by altitude on coffee plant response on multiple agroforestry research farms in Costa Rica. Results show large variability of coffee traits: leaf photosynthetic rates, specific leaf area (SLA) and number of fruiting nodes deviate along both gradients. Mean SLA increased with increasing shade tree diversity. However, with increasing altitude, full sun coffee photosynthesized at higher rates than shaded coffee. Concurrently, other coffee leaf physiological and morphological traits differentiated between full sun and shaded coffee with increasing altitude. Results suggest soil moisture and light availability dominate environmental correlates to intraspecific coffee trait plasticity, providing insight to sources of coffee performance variability in monoculture and agroforestry systems. agroforestry coffee trait plasticity Costa Rica biodiversity climate shade grown coffee intraspecific edaphic CATIE trait variability landscape scale local scale altitude photosynthesis yield shade tree leaf physiology leaf morphology plant interactions plant response phenotypic plasticity 0368 0473 0329
2	Intraspecific Trait Plasticity in Coffee Agroforestry Systems of Costa Rica Gagliardi, Stephanie 18 March 2014 (has links) Although a common plant response to environmental gradients, leaf trait plasticity is often uncharted in agroforestry systems. The objective of this study was to examine the effect of a i) local-scale gradient (light, nutrients) induced by shade tree diversity and ii) large-scale gradient (climato-edaphic) induced by altitude on coffee plant response on multiple agroforestry research farms in Costa Rica. Results show large variability of coffee traits: leaf photosynthetic rates, specific leaf area (SLA) and number of fruiting nodes deviate along both gradients. Mean SLA increased with increasing shade tree diversity. However, with increasing altitude, full sun coffee photosynthesized at higher rates than shaded coffee. Concurrently, other coffee leaf physiological and morphological traits differentiated between full sun and shaded coffee with increasing altitude. Results suggest soil moisture and light availability dominate environmental correlates to intraspecific coffee trait plasticity, providing insight to sources of coffee performance variability in monoculture and agroforestry systems. agroforestry coffee trait plasticity Costa Rica biodiversity climate shade grown coffee intraspecific edaphic CATIE trait variability landscape scale local scale altitude photosynthesis yield shade tree leaf physiology leaf morphology plant interactions plant response phenotypic plasticity 0368 0473 0329

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Intraspecific Trait Plasticity in Coffee Agroforestry Systems of Costa Rica

Intraspecific Trait Plasticity in Coffee Agroforestry Systems of Costa Rica