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Agroforestry systems can repair degraded watersheds
Date:3/27/2014

blems, such as floods, droughts, reductions in water quality and increases in soil erosion and downstream sedimentation of irrigation networks.

"The degraded watershed has been largely deforested and replaced with extensive agricultural and grasslands over the last half century", says David Wilson, the lead researcher. "It has disrupted the evenness of river flow, resulting in alternate flooding and drought episodes, an accelerated level of soil erosion as well as downstream sedimentation".

SWAT was used to simulate the impacts of current land-use practices and conservation agriculture with agroforestry in strategic locations. The study results showed a significant reduction in sediment yield (20%) and sediment concentration (35%)in the Gabayan watershed under agroforestry and conservation agriculture.

The study was therefore able to provide scientific evidence that agroforestry, combined with improved land management practices, are an effective land-use strategy for the watersheds.

"Specifically, the use of restored areas that have vegetation next to water resources and contour planting in grasslands appear to be the most effective techniques to reduce sediment transfer to the watershed river network", says Wilson.


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Contact: Daniel Kapsoot
D.Kapsoot@cgiar.org
254-725-733-895
World Agroforestry Centre (ICRAF)
Source:Eurekalert  

Page: 1 2

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