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Impacts of shade trees on hydrological services and erosion in a coffee AFS of Costa Rica: scaling from plot to watershed. Federico Gómez-Delgado PhD Student Roger Moussa Bruno Rapidel Rintaro Kinoshita Alexis Perez Philippe Vaast Jean-Michel Harmand Olivier Roupsard. CAFNET Project.
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What is the rate and type of erosion in coffee watersheds and how much do trees reduce it?
we propose to assess and model the water balance and sediment yield from plot to watershed
Can AF practices be promoted and rewarded as hydrological services?
Hydropower profitability is limited by sedimentation of reservoirs. The tools here developed could help in the negotiation of hydrological services between coffee producers and hydropower institutes/companies in Costa Rica
Turrialba river watershed
Area = 77 km2
Aquiares experimental watershed
Area = 1 km2
Mean slope: 20%
Max. slope: 89%
S.Runoff + Erosion
Vapor, Carbon, Climate
Water table level
Soil properties experiments
Plants + Trees
Soil water content
Streamflow + Turbidity
Cafnet / CoffeeFlux
very high infiltration => low runoff
~> low laminar erosion
then: flooding events non-laminar erosion
Potential and actual ET (AET)
Soil moisture (SM)
Water storage: upper GW box (STZ)
middle GW box (SUZ)
Water storage: lower GW box (SLZ)
Observed precipitation (P)
Observed and simul. streamflow (Q)
Total SY = 564 kg (100%)
(measured at the
- SY non-shade = 169 kg (30%)
- SY shade = 51 kg (9% )
SY road+n.lam.= 344 kg (61%)
2/3 of watershed sediment yield comes from non-laminar sources!
We designed an experimental display in a coffe AF system
(andosols, montaneaous) in order to assess and model:
· the water balance partitioning from plot to watershed
· the sediment yield from plot to watershed
A combination of techiques and models allowed to evidence that:
· streamflow was dominated by the base flow (aquifer)
· the infiltration rate was enormous in these conditions (andosols, many roots)
· the laminar erosion was low as compared to the non-laminar erosion
End of presentation