The shade impact by Ingo densiflora on water use and drainage in a coffee agroforestry system (AFS) was compared to coffee monoculture (MC) in Costa Rica. Rainfall interception, transpiration, runoff and soil water content were monitored during 3 years. Runoff was lower in AFS than MC (5.4 and 8.4% of total rainfall, respectively) and a higher water infiltration was observed under AFS. Still, the higher combined rainfall interception + transpiration of coffee and shade trees in AFS resulted in a lower drainage than in MC. No coffee water stress was recorded either in AFS or MC as relative extractable soil water remained above 20% during the dry seasons. Time course of soil water content showed enhanced access to soil water between 100 and 200 cm depth in AFS. This suggests complementarity for soil water between coffee and shade trees. The model HYDRUS 1D predicted that drainage at 200 cm depth accounted for a large fraction of annual rainfall (68% for MC and 62% for AFS). Climatic scenario simulations showed (1) a potential competition for water between coffee and shade trees when the dry season was extended by 4-6 weeks compared to actual, and (2) a severe reduction in annual drainage, but without competition for water when rainfall was reduced down to 40% of the actual. (C) 2010 Elsevier B.V. All rights reserved.
- Climatic change
- Coffea arabica
- Inga densiflora
- Water use
- Water drainage
- ARABICA L.
[Cannavo, P.; Harmand, J. -M.; Vaast, P.] CIRAD, UMR Eco&Sols, Ecol Fonct & Biogeochim Sols & Agroecosyst, SupAgro CIRAD INRA IRD, F-34060 Montpellier, France; [Sansoulet, J.] CIRAD, UR Risque Environm Recyclage 78, F-97408 St Denis 9, France; [Siles, P.] BIOVERSITY, Turrialba 7170, Costa Rica; [Siles, P.] CATIE Ctr Agron Trop Invest & Ensenensa, Turrialba 7170, Costa Rica; [Dreyer, E.] INRA, UMR1137, Ecol & Ecophysiol Forestieres, F-54280 Champenoux, France; [Dreyer, E.] Univ Nancy, UMR1137, Ecol & Ecophysiol Forestieres, F-54500 Vandoeuvre Les Nancy, France
Cannavo, P (reprint author), UR EPHOR, Agrocampus Ouest Ctr Angers, 2 Rue Notre, F-49045 Angers 1, France.