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Federico Gómez-Delgado PhD Student Roger Moussa Bruno Rapidel Rintaro Kinoshita Alexis Perez

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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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Presentation Transcript
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Impacts of shade trees on hydrological services and erosionin 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

INRA

research questions
Research questions

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

study site cafnet coffeeflux experiment
Study site: Cafnet/CoffeeFlux experiment

Turrialba river watershed

Area = 77 km2

Turrialba volcano

Aquiares experimental watershed

Area = 1 km2

Mean slope: 20%

Max. slope: 89%

Coffee plantations

COSTA RICA

CENTRAL AMERICA

slide4
H2O

Experimental Plots

CO2

Piezometers

S.Runoff + Erosion

Flux Tower

Vapor, Carbon, Climate

Water table level

Soil properties experiments

  • Infiltrability
  • Hydraulic
  • conductivity

Plants + Trees

flow experiments

  • LAI
  • Interception
  • Throughfall
  • Stemflow
  • Sapflow

Rainfall Stations

Hydraulic Flume

Soil Tubes

Rainfall

Soil water content

Streamflow + Turbidity

Cafnet / CoffeeFlux

Experimental display

slide8
Simulation of water balance HBV lumped model

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)

sediment yield sy event 29 06 09 plot to watershed scale
Sediment Yield (SY)Event 29/06/09, plot to watershed scale

Total SY = 564 kg (100%)

(measured at the

outlet catchment)

- SY non-shade = 169 kg (30%)

- SY shade = 51 kg (9% )

SY road+n.lam.= 344 kg (61%)

Scaled up

Scaled up

By diff.

2/3 of watershed sediment yield comes from non-laminar sources!

conclusions
Conclusions

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

perspectives
Perspectives
  • to close water balance on one full year at least
  • to continue accumulating sediment yield
  • to assess the influence of tree density and slope on plot erosion and scale up to watershed
  • to explain the origin of non-laminar erosion and see how management can reduce it
  • to validate in other contrasting watershed (other soil, other slope, other tree density...)
many thanks
Many thanks!

End of presentation

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