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Accueil du site → Doctorat → États-Unis → 2013 → Drought resilience of maize-legume agroforestry systems in Malawi.

University of California, Berkeley (2013)

Drought resilience of maize-legume agroforestry systems in Malawi.

Kerr, Amber Catherine

Titre : Drought resilience of maize-legume agroforestry systems in Malawi.

Auteur : Kerr, Amber Catherine

Université de soutenance : University of California, Berkeley

Grade : Doctor of Philosophy (PhD) 2013

Résumé partiel
Agroforestry – the practice of growing trees and crops on the same land – has recently been suggested as a potential tool for adaptation to climate change. There are many mechanisms by which trees on farmland could help to ameliorate climatic stresses : moderation of microclimate, increased soil water-holding capacity, increased infiltration, reduced runoff, complementary use of water resources, and diversification of production risk. However, these benefits remain largely speculative, with very few controlled experiments to demonstrate them. Furthermore, little is known about how agroforestry systems themselves might be adversely affected by climatic stress, especially during the vulnerable stage of seedling establishment. This dissertation attempts to address some of these questions with regard to “fertilizer tree” agroforestry systems in Malawi. In these systems, maize is intercropped with fast-growing leguminous trees, and biomass from the trees is regularly incorporated into the soil to increase crop yields. Though fertilizer trees are demonstrably effective under normal climatic conditions in southern Africa, their drought tolerance has not been systematically examined. For this threeyear project (2008-2011), a novel and low-cost rain exclusion shelter design was used to impose an artificial drought on several Gliricidia sepium and Tephrosia candida fertilizer tree systems at Makoka Agricultural Research Station (15º31’S, 35º13’E) in southern Malawi.

Mots clés : Biology, Ecology ; Climate Change ; Agriculture, General

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Page publiée le 21 septembre 2013, mise à jour le 7 octobre 2017